CN107644135B

CN107644135B - Method for forming load combination

Info

Publication number: CN107644135B
Application number: CN201710863829.8A
Authority: CN
Inventors: 严旭; 范盛颖; 黄佑验; 周凯; 郑中; 陈其春; 黄永军; 周光炳; 张晋宾; 何姜江; 唐茂平; 薛江; 蒲涛; 李建鹏; 蒋贵丰
Original assignee: Southwest Electric Power Design Institute Co Ltd of China Power Engineering Consulting Group
Current assignee: Southwest Electric Power Design Institute Co Ltd of China Power Engineering Consulting Group
Priority date: 2017-09-22
Filing date: 2017-09-22
Publication date: 2020-12-11
Anticipated expiration: 2037-09-22
Also published as: CN107644135A

Abstract

The invention relates to the field of building construction structures and discloses a method for forming a load combination. The method comprises the following steps: creating a load working condition and setting a name, a number, a category and a coefficient required when the load working condition participates in combination; after the load working conditions which can be combined are combined, all the working conditions which can be used as independent working conditions to participate in load combination are intermediate working conditions; dividing the same type of mutually exclusive intermediate working conditions into load intermediate types; setting logic relations between the intermediate types and between the intermediate working conditions; automatically classifying and creating an intermediate type combination formula, and deleting the combination formula which does not meet the logic relationship between the intermediate types; traversing the intermediate type combination formula, automatically substituting the intermediate working conditions into the intermediate type to form all possible intermediate working condition combination formulas, and deleting the combination formulas which do not meet the logic relationship between the intermediate working conditions; automatically filling the coefficient of the load working condition completely according to the category of the combined formula; and automatically calculating the coefficient of the load working condition in the combined formula, and classifying and eliminating repeated load combinations.

Description

Method for forming load combination

Technical Field

The invention relates to the technical field of house building structure analysis, in particular to a method for forming a load combination.

Background

Load assembly is an important component of structural analysis. After determining the load conditions, the structural engineer needs to specify the combination of loads. The load combination without redundancy and missing items is a precondition for realizing a safe, applicable, economic and reasonable analysis result.

Currently, there are three ways for structural engineers to implement load combining in the design process: 1) adopting a structural analysis software with solidified load combination; 2) a load combination tool provided by structural analysis software is adopted; 3) and (4) manually inputting a load combination. The 1 st mode is a common selection of civil structures, and adopts structure analysis software with solidified load working conditions and load combinations, only loads need to be directly input in corresponding load working conditions, the analysis software can provide default load combinations, and engineers do not need to care about how to generate the load combinations. The problem with this approach is that the number of load conditions that are solidified in the analysis software is limited, and for industrial structures, it can only be directly employed when the load conditions are relatively simple. When the load working conditions are complex, the load working conditions are simplified and combined and then input into structural analysis software, so that certain economy is sacrificed; however, when the load conditions cannot be simplified and combined into one calculation model at one time, a plurality of identical structural models need to be created to accommodate the loads, and envelope values of calculation results of the models need to be taken, so that the workload is large, the operation is complicated, and errors are easy to occur. The 2 nd mode is to list load combinations according to the principle of permutation and combination, and has the problems that a reasonable rule cannot be set to completely eliminate redundant combinations, when the load working condition is complicated, a plurality of combinations which do not exist can be generated, and are difficult to discriminate and delete, so that the analysis and calculation time is increased, an over-conservative calculation result can be formed, and the process of forming the load combinations is not formed, so that the tracing and the checking are not convenient. The 3 rd mode is to manually input the final result of the load combination, and requires an engineer to manually complete the load combination in advance, so that the efficiency is extremely low, errors are easy to occur, and the checking is inconvenient. In the analysis of industrial structures, the three ways of realizing load combination are widely used at present.

Therefore, a more convenient method is needed, which can quickly generate a load combination which is not redundant, has no missing items, can be traced back and is easy to check, is convenient for engineers to deeply understand and apply the load combination, and improves the efficiency and the accuracy of structural analysis.

Disclosure of Invention

The present invention addresses the above-identified problems by providing a method of forming a load combination. After creating a basic load working condition, merging the load working condition which cannot independently participate in load combination with other load working conditions in the form of a mathematical formula, and after merging treatment, all the load working conditions which can participate in load combination as independent load working conditions are intermediate working conditions of the load; dividing the same-class mutually exclusive intermediate working conditions together to obtain load intermediate types, wherein the intermediate types are in a compatible relationship by default; after the logic relation between the intermediate types and the logic relation between the intermediate working conditions are set, a combination formula based on the intermediate types is automatically created in the form of a mathematical formula, then the intermediate working conditions are automatically substituted to generate the combination formula based on the intermediate working conditions, then according to the difference of the classes of the combination formula, the coefficients are completely filled in the combination formula before the load working conditions according to the requirements of design specifications, then the final coefficient of each load working condition can be calculated, and after the repeated combination formula is deleted in a classified mode, the coefficients are stored according to a set data format. To this end, redundancy-free, item-tight combinations of loads are efficiently generated as intended by the engineer and are convenient to trace back and check.

The technical scheme adopted by the invention is as follows: a method of forming a load combination comprising the process of:

step S1, creating load working conditions and setting names, numbers, categories and coefficients required when the load working conditions are combined;

step S2, merging the load working condition which can not participate in the load combination independently in the step S1 with other load working conditions in the step S1 in the form of a mathematical formula, and after merging treatment, all the load working conditions which can participate in the load combination as independent load working conditions are intermediate working conditions of the load; dividing the same-class mutually exclusive intermediate working conditions together to obtain load intermediate types, wherein the intermediate types are in a compatible relationship by default; then classifying and creating intermediate types of the load, filling all intermediate working conditions into the intermediate types, setting the logic relationship between the intermediate working conditions to eliminate unnecessary combination formulas, and finally classifying and creating a supplementary load combination formula;

step S3, automatically classifying and creating an intermediate type combination formula based on the intermediate type in the form of a mathematical formula, and automatically deleting the combination formula which does not meet the logic relationship between the intermediate types;

step S4, traversing the combined formula formed in the step S3, if the formula has an intermediate type, automatically substituting the intermediate type with the intermediate working condition to form all possible intermediate working condition combined formulas, and automatically deleting the intermediate working condition combined formulas which do not meet the logic relation between the intermediate working conditions; traversing the combined formula supplemented in the step S2, and if the formula has an intermediate type, automatically substituting the intermediate type with the intermediate working condition to form all possible intermediate working condition combined formulas;

s5, automatically filling the coefficients of the load working conditions belonging to the variable load and earthquake action in the intermediate working condition combined formula completely according to the category of the combined formula;

and step S6, calculating the coefficient of the load working condition in each load combination formula to form a final load combination result, classifying and eliminating repeated load combinations, and storing the load combinations as texts or writing the load combinations into source data files which can be identified by structural analysis software after supplementary modification.

As a further technical solution, the step S2 specifically includes: step S21, classifying the load working condition into 4 types of permanent load, accidental load, variable load and earthquake action, and respectively establishing and naming the intermediate type of the load under the 4 types of load; step S22, under each intermediate type, creating one or more intermediate working conditions in the form of mathematical formulas; step S23, setting logic relations among the intermediate types, setting specific logic relations among the intermediate types which must appear simultaneously, and setting specific logic relations among the intermediate types which cannot appear simultaneously; s24, setting logic relations between intermediate working conditions which do not belong to the same intermediate type, setting specific logic relations between the intermediate working conditions which must occur simultaneously, setting specific logic relations between the intermediate working conditions which cannot occur simultaneously, and setting specific logic relations between the intermediate working conditions and the intermediate working conditions when one intermediate working condition can only be combined with one intermediate working condition of another intermediate type; step S25, creating a supplemental load combination formula by classification in the format of the combination formula of step S3 or S4.

As a further technical solution, in the steps S21-S22: (1) non-seismic design conditions: respectively creating an intermediate type for the permanent load and the accidental load, respectively creating corresponding intermediate working conditions according to different types of the load combination formula, determining the coefficient of each load working condition in the mathematical expression of the intermediate working conditions, and not distinguishing the type of the load combination formula for the intermediate working conditions of the variable load and not containing any coefficient; (2) during earthquake design conditions: respectively creating an intermediate type and a subordinate intermediate working condition without any coefficient for the horizontal earthquake action and the vertical earthquake action in the earthquake action, combining the intermediate working condition of the permanent load and the intermediate working condition of the variable load without the wind load according to the difference of the load combination formula types for the permanent load and the variable load without the wind load, and determining the coefficient of each load working condition in the mathematical expression of the intermediate working condition; (3) for load conditions including wind loads and seismic effects, reverse load conditions not created at step S1 need to be supplemented completely in creating intermediate conditions.

As a further technical scheme, the specific process of the step S3 is that the step S31 is to create an intermediate type combination formula when the non-seismic design condition is created: according to different types of load combination formulas, the intermediate working conditions of permanent loads and accidental loads corresponding to the combination formulas are exhausted to be combined with the intermediate types of the variable loads, and when the intermediate type combination formulas need to consider the situation that all the variable loads can be used as the dominant variable loads, the intermediate types of all the variable loads are used as the dominant variable loads in turn; step S32, creating an intermediate type combination formula in the earthquake design condition: according to different types of load combination formulas, combining the input permanent loads and the variable load intermediate working conditions excluding wind loads, and exhausting the intermediate type combination with the earthquake action; if wind load needs to be considered during earthquake, the combined permanent load and the intermediate working condition of the variable load excluding the wind load are added with the intermediate type of the wind load, and then the combination of the permanent load and the intermediate type of the earthquake action is exhausted; when the horizontal seismic action and the vertical seismic action exist in the combined formula at the same time, the middle type of the horizontal seismic action and the middle type of the vertical seismic action are used as the main seismic action in turn; step S33, if the structure importance coefficient gamma 0 needs to be multiplied into the load combination formula, selecting the corresponding combination formula, including the combination formula by the bracket A and multiplying the value of gamma 0 outside the bracket; step S34, after the logic relationship between the intermediate types is counted, traversing and checking the intermediate type combination formula, and deleting the combination formula which does not meet the logic relationship between the intermediate types; and step S35, checking the number of the intermediate working conditions under each intermediate type, if the number of the intermediate working conditions is zero, traversing the intermediate type combination formula, and deleting the combination formula with the intermediate type.

As a further technical solution, in the step S3, the middle type in each combination formula is enclosed by a bracket B, and a special mark D is added before the middle type dominating the variable load or the middle type dominating the seismic action.

As a further technical solution, in the step S31, the combination with the intermediate types of the variable load is exhausted, and the cases that all the intermediate types belonging to the variable load do not participate in the combination, only 1 participation combination, two rounds of superimposed participation combinations, three rounds of superimposed participation combinations, and up to the intermediate types of the variable load all participate in the combination are considered.

As a further technical scheme, the method is characterized in that: in the step S32, the intermediate types of combinations with the seismic action are exhausted, and only the horizontal seismic action is involved in the combination, only the vertical seismic action is involved in the combination, and the horizontal and vertical seismic actions are simultaneously involved in the combination, but the case where the seismic action is not involved in the combination is not considered.

As a further technical scheme, the method is characterized in that: in step S3, when the intermediate condition is substituted into the intermediate type, if the intermediate condition is not formed by directly referring to the load condition in step S1, the intermediate condition is enclosed by a bracket C.

As a further technical scheme, the method is characterized in that: the specific process of step S4 is as follows: step S41, selecting a first formula from the intermediate type combination formulas formed in the step S3, directly copying if no intermediate type exists in the formula, and substituting the intermediate types in the formula into all possible intermediate working condition combination formulas according to respective intermediate working condition turns when the intermediate type exists in the formula; step S42, selecting the next combination formula, and repeating the step S41 until the processing of each intermediate type combination formula is completed; step S43, uniformly judging whether the logic relation between the intermediate working conditions is met or not for all the intermediate working condition combination formulas generated in the steps S41-S42, and if not, deleting the intermediate working condition combination formulas; step S44, selecting a first formula from the supplementary combined formulas of step S25, directly copying if no intermediate type exists in the formula, and substituting the intermediate types in the formula with respective intermediate working condition turns to generate all possible intermediate working condition combined formulas when the intermediate types exist in the formula; step S45, selecting the next combination formula, and repeating step S44 until the processing of each complementary combination formula is completed.

As a further technical solution, the specific process of step S5 is as follows: step S51, selecting the first intermediate working condition combination formula formed in step S4, if there is a bracket B in the formula: filling in coefficients required by the load working conditions to participate in combination before each load working condition in the bracket B according to different types of the combination formulas, wherein the coefficients are connected by a multiplication sign '+' and are filled with coefficients according to the leading variable load or the leading earthquake action with a special mark D; and S52, selecting the next formula, and repeating the step S51 until the filling of the coefficients of all the intermediate working condition combination formulas is completed.

As a further technical solution, the specific process of step S6 is as follows: s61, selecting the first combination formula formed in the step S5, and calculating coefficients of all load working conditions participating in the combination according to a mathematical operation rule; s62, selecting the next formula, and repeating the step S61 until the calculation of the load working condition coefficients in all the combined formulas is completed; step S63, according to the different types of the combination formulas, checking and deleting the repeated combination formulas in each type of combination; step S64, supplementary modification is carried out on the combined formula; and step S65, numbering and naming the combined formulas in sequence, and storing or writing the load combined result into a data file which can be identified by the structural analysis software in a text form.

Compared with the prior art, the beneficial effects of adopting the technical scheme are as follows:

and combining the initial load working conditions as much as possible to obtain the load working conditions which can be used as independent working conditions to participate in load combination, namely obtaining the intermediate working conditions of the load. After the intermediate working conditions are classified, intermediate types can be divided. After creating the intermediate type, the intermediate working condition, setting the logic relationship between the intermediate types and setting the logic relationship between the intermediate working conditions, automatically creating a combination formula based on the intermediate type and deleting the combination formula which does not satisfy the logic relationship between the intermediate types, automatically substituting the intermediate working condition into the intermediate type to create the combination formula of the intermediate working condition and delete the combination formula which does not satisfy the logic relationship between the intermediate working conditions, and automatically filling the coefficients when the load working conditions participate in combination completely according to the design specifications, so that the final coefficient when the load working conditions participate in combination can be calculated. The method not only forms the load combination without redundancy and missing items with high efficiency, but also is convenient for tracing and checking, is convenient for engineers to understand and use, improves the design efficiency, and realizes the safe, applicable, economic and reasonable design target.

Detailed Description

The present invention will be further described with reference to the following examples.

A method for forming a load combination specifically comprises the following processes: step S1, creating load working conditions and setting names, numbers, categories and coefficients required when the load working conditions are combined;

Step S1 is to create a load condition and set a name, a number, a category, and a coefficient required for participating in the combination, and the specific process is as follows: step S11, setting the value of the structure importance coefficient gamma 0; step S12, creating a load working condition, setting the name, number and category of the load working condition, wherein the category is permanent load, accidental load, variable load, horizontal earthquake action or vertical earthquake action; step S13, when the load working condition type is variable load, setting a polynomial coefficient gamma_QA combined value coefficient psi c, a frequency coefficient psi_fQuasi-permanent value coefficient psi q, design service life adjusting coefficient gamma_LWherein γ is_LIs 1.0; step S14, establishing the next load working condition from the step S12 until the establishment of the load working condition is completed; step S15, setting the element coefficient of the earthquake action when the earthquake design conditions are basically combined: in the created load working condition, if the horizontal earthquake action exists, the horizontal earthquake action is set as the subentry coefficient gamma of the horizontal earthquake action when the horizontal earthquake action is dominant_EhAnd the sub-coefficient gamma of the vertical seismic action at that time_EvIf there is vertical earthquake action, setting vertical earthquake action as the main earthquake action, and setting the subentry coefficient gamma of vertical earthquake action_EvAnd the sub-coefficient gamma of the horizontal seismic action at that time_Eh(ii) a Step S16, setting the element coefficient of the earthquake action when the earthquake design condition standard combination is combined: in the created load working condition, if the horizontal earthquake action exists, the horizontal earthquake action is set as the subentry coefficient gamma of the horizontal earthquake action when the horizontal earthquake action is dominant_EhAnd the sub-coefficient gamma of the vertical seismic action at that time_EvIf there is vertical earthquake action, setting vertical earthquake action as the main earthquake action, and setting the subentry coefficient gamma of vertical earthquake action_EvAnd the sub-coefficient gamma of the horizontal seismic action at that time_Eh(ii) a Step S17, the default value of the combination value coefficient psi w when the wind load participates in the earthquake action combination is 0, if so, the combination value coefficient psi w isSetting the value of ψ w in consideration of the combination of wind load and seismic action; step S18 is to input the value of the effect Sge of the gravity load representative value in the form of a mathematical formula.

Step S2 is to create an intermediate type of load, an intermediate working condition, set a logical relationship between intermediate types, set a logical relationship between intermediate working conditions, and classify and supplement a combination formula, and the specific process is as follows: step S21, the categories of the intermediate types are 4 types, namely "permanent load", "accidental load", "variable load", and "seismic action", respectively, and the intermediate type of the load is created, specifically: creating an intermediate type under the permanent load and named as ' dead load ', creating an intermediate type under the ' accidental load ' and named as ' accidental ', creating one or more intermediate types under the variable load ' and named as ' wind load ', creating an intermediate type under the earthquake action and named as ' horizontal E ' if horizontal earthquake action exists, and creating an intermediate type under the earthquake action and named as ' vertical E ' if vertical earthquake action exists; step S22, under each intermediate type, directly quoting the load working condition created in the step S11 or creating one or more load intermediate working conditions in the form of mathematical formulas by connecting symbols "+", "", wherein the intermediate working conditions belonging to one intermediate type are mutually exclusive; step S23, setting logic relation between the intermediate types, setting 'must-be-the-same' relation for the intermediate types which must appear simultaneously, and setting 'exclusive' relation for the intermediate types which cannot appear simultaneously; s24, setting logic relations among the intermediate working conditions, setting ' must-be-the-same ' relations among the intermediate working conditions which must occur simultaneously, setting ' exclusive-mutual ' relations among the intermediate working conditions which cannot occur simultaneously, and setting the ' one-way compatibility ' of the former intermediate working condition with the ' latter intermediate working condition when one intermediate working condition is only possible to be combined with a certain intermediate working condition of another intermediate type; and step S25, according to the format of the combination formula of the step S3 or S4, respectively corresponding to a basic combination, an accidental combination for carrying capacity limit state calculation, an accidental combination for checking the overall stability after an accidental event, a standard combination, a frequent combination, a quasi-permanent combination, an earthquake design condition basic combination, an earthquake design condition standard combination and a supplementary load combination formula.

The specific process of step S22 is as follows: step S221, inputting intermediate conditions of an intermediate type of 'dead load' corresponding to a basic combination (in variable effect control), a basic combination (in permanent effect beneficial to a structure), an accidental combination (for bearing capacity limit state calculation), an accidental combination (for overall stability verification calculation after an accidental event), a standard combination, a frequent combination and a quasi-permanent combination respectively, wherein coefficients of load conditions of all components are determined in a mathematical expression of the intermediate conditions; step S222, inputting an intermediate working condition that an intermediate type 'accidental' corresponds to an accidental combination for calculating the load capacity limit state, and determining coefficients of all component load working conditions in a mathematical expression of the intermediate working condition; step S223, inputting intermediate working conditions of each intermediate type of variable load, not distinguishing the type of the load combination formula, and not inputting any coefficient in the mathematical expression of the intermediate working conditions; step S224, if the intermediate type 'level E' exists, creating an intermediate working condition of the intermediate type, and inputting no coefficient in a mathematical expression of the intermediate working condition; step S225, if the middle type vertical E exists, establishing a middle working condition of the middle type, and inputting no coefficient in a mathematical expression of the middle working condition; step S226, when the basic combination of the earthquake action is in a general condition, the intermediate working conditions of the permanent load and the variable load (not including the wind load) are merged together and input, and the coefficient of each load working condition is clarified in the mathematical expression of the intermediate working conditions; step S227, when the permanent effect is beneficial to the structure corresponding to the basic combination of the earthquake action, the intermediate working conditions of the permanent load and the variable load (not including the wind load) are merged together and input, and the coefficient of each load working condition is clarified in the mathematical expression of the intermediate working conditions; step S228, corresponding to the earthquake action standard combination, the intermediate working conditions of the permanent load and the variable load (not including the wind load) should be merged together and input, and the coefficients of the respective load working conditions should be clarified in the mathematical expression of the intermediate working conditions.

The step S23 is characterized by: (1) after an intermediate type, the intermediate type is connected with the symbol "&" must be identical ", with the symbol"! "connect" mutually exclusive "intermediate types. (2) "must be" is bi-directional, and if two intermediate types "must be" are combined, then either must be combined at the same time as the other. (3) "mutual exclusion" is bi-directional, and if two intermediate types "mutual exclusion" are used, then when any one participates in the combination, the other cannot participate in the combination at the same time.

The step S24 is characterized by: (1) after an intermediate condition, the intermediate condition to be "one-way compatible" is connected with the symbol "&" to "must be the same", the intermediate condition to be "one-way compatible" is connected with the symbol "@", and the intermediate condition to be "one-way compatible" is connected with the symbol "! "connect" mutually exclusive "intermediate conditions. (2) Intermediate conditions that do not belong to the same intermediate type allow for simultaneous participation in the combination by default. (3) "must be the same" is two-way, if two intermediate conditions "must be the same", then either must participate in the combination, the other must participate in the combination at the same time. (4) The unidirectional compatibility is unidirectional, if the intermediate working condition 1 of the intermediate type A is unidirectional compatibility with the intermediate working condition 2 of the intermediate type B, the intermediate type A and the intermediate type B can respectively and independently participate in combination, and can also participate in combination simultaneously; however, when the two intermediate types participate in the combination at the same time, if the intermediate working condition 1 occurs and the intermediate working condition 2 does not occur, the logical relationship is considered to be not satisfied, at this time, the intermediate working condition 1 cannot be combined with other intermediate working conditions of the intermediate type B, but the intermediate working condition 2 should be combined with other intermediate working conditions of the intermediate type a. (5) Mutual exclusion is bidirectional, and if two intermediate working conditions are mutually exclusive, when any one participates in combination, the other one cannot participate in combination at the same time. (6) An intermediate condition may be "must be identical", "one-way compatible", or "exclusive" intermediate conditions, but only shows the 1 st intermediate condition to 2 nd, 1 st intermediate condition to 3 rd, 1 st intermediate condition to 4 th … … 1 st intermediate condition to last intermediate condition 1 to 1 relationship. For example, an intermediate condition is a plurality of "mutually exclusive" intermediate conditions, which means that the former and the latter intermediate conditions are mutually exclusive, but the latter intermediate conditions do not have a mutually exclusive relationship.

The step S25 is characterized by: in the supplementary combined formula, the brackets "[ and ] can only fill in the intermediate type, or the intermediate working condition, or the load working condition of the variable load and the earthquake action, and any coefficient can not be input before the intermediate type, the intermediate working condition, or the load working condition in the brackets, and the coefficients can be automatically filled in completely in the step S5.

Step S3, according to different types of the load combination formulas, creating a load combination formula based on an intermediate type in a mathematical formula form, wherein the specific process is as follows, step S31, creating the intermediate type combination formula under the non-earthquake design condition: according to the specification of the design specification and according to the difference of the types of the load combination formulas, the combination of the intermediate types of the variable loads and the intermediate working conditions of the permanent loads and the accidental loads corresponding to the combination formulas is exhausted, and when the combination formulas need to consider the situation that all the variable loads can be used as the dominant variable loads, the intermediate types of all the variable loads are used as the dominant variable loads in turn; step S32, creating an intermediate type combination formula in the earthquake design condition: according to the specification of the design specification and according to the difference of the types of load combination formulas, the intermediate type combination of the permanent load and the variable load excluding the wind load which are input together is exhausted; if wind load needs to be considered during earthquake, the combined permanent load and the intermediate working condition of the variable load excluding the wind load are added with the intermediate type of the wind load, and then the combination of the wind load and the intermediate type of earthquake action is exhausted; when the horizontal seismic action and the vertical seismic action exist in the combined formula at the same time, the middle type of the horizontal seismic action and the middle type of the vertical seismic action are used as the main seismic action in turn; step S33, if the structural importance coefficient gamma 0 needs to be multiplied into the load combination formula, selecting the combination formula which needs to be multiplied by gamma 0, all included by symbols "{", "}", and filling the value of gamma 0 in front of "{"; step S34, after the logic relationship between the intermediate types is counted, traversing and checking the intermediate type combination formula, and deleting the combination formula which does not meet the logic relationship between the intermediate types; and step S35, checking the number of the intermediate working conditions under each intermediate type, if the number of the intermediate working conditions is zero, traversing the intermediate type combination formula, and deleting the combination formula with the intermediate type.

The step S3 is characterized by: (1) in the form of a mathematical formula, a load combination formula containing an intermediate type of variable load or an intermediate type of seismic action is created using only the symbols "+", "-" connected and without additionally inputting any coefficients. (2) In each combination formula, brackets "[ and" ] are used to bracket the intermediate types in the formula, and a symbol "●" is added before the intermediate type of the dominant variable load or the intermediate type of the dominant seismic action, for example, the combination formula "DL + [ live load + equipment + ● temperature ] indicates that the temperature is the dominant variable load, and the combination formula" 1.2Sge + [ horizontal E + ● vertical E + wind load ] indicates that the vertical E is the dominant seismic action.

The step S31 is characterized by: the load combination formula based on the intermediate type in the non-earthquake design condition has 8 categories, namely basic combination (in variable effect control), basic combination (in permanent effect beneficial to the structure), accidental combination (for bearing capacity limit state calculation), accidental combination (for overall stability verification calculation after accidental events), standard combination, frequent combination and quasi-permanent combination. When the combination with the variable load intermediate type is exhausted, the condition that the effect of the variable load intermediate type is beneficial to the bearing capacity and does not participate in the combination is considered according to the unified design standard for engineering structure reliability GB50153, namely all possibilities that all the intermediate types belonging to the variable load do not participate in the combination, only 1 participation combination, two rounds of superposition participation combination, three rounds of superposition participation combination … … and all the intermediate types of the variable load participate in the combination are considered.

The step S32 is characterized by: the categories of the load combination formula based on the intermediate types in the earthquake design condition are 3, namely the basic combination (general condition) of the earthquake design condition, the basic combination (when the permanent effect is beneficial to the structure) of the earthquake design condition and the standard combination of the earthquake design condition. When the combination with the intermediate type of earthquake action is exhausted, only horizontal earthquake action participates in the combination, only vertical earthquake action participates in the combination, and both horizontal and vertical earthquake action participates in the combination, but the possibility that the earthquake action does not participate in the combination is not considered.

The specific process of the step S31 is that, in step S311, a load combination formula for basic combination in variable effect control is created: respectively exhausting the combination of the intermediate type and each intermediate type under the variable load under the intermediate working condition of the intermediate type constant load at the moment, wherein when only one intermediate type of the variable load exists in the combination formula, the intermediate type is used as the dominant variable load, and when 2 or more intermediate types of the variable load exist in the combination formula, the intermediate type of each variable load is used as the dominant variable load in turn; step S312, creating a load combination formula of the basic combination in the permanent effect control: the combination of each intermediate type under variable load is exhausted under the intermediate working condition of the intermediate type constant load at the moment; step S313, creating a load combination formula of the basic combination when the permanent effect is beneficial to the structure: the combination of the intermediate types under the variable load is exhausted under the intermediate working condition of the intermediate type constant load at the moment, when only one intermediate type of the variable load exists in the combination formula, the intermediate type is used as the dominant variable load, and when the intermediate types of the variable load of 2 or more exist in the combination formula, the intermediate type of each variable load is used as the dominant variable load in turn; step S314, creating a load combination formula for calculating the limit state of the carrying capacity by the accidental combination: all possible combinations of the intermediate working conditions under the intermediate type constant load and the intermediate working conditions under the intermediate type accidental are exhausted and combined with all the intermediate types under the variable load respectively, when only one intermediate type of the variable load exists in the combination formula, the intermediate type is used as the dominant variable load, and when 2 or more intermediate types of the variable load exist in the combination formula, the intermediate type of each variable load is used as the dominant variable load in turn; step S315, a load combination formula for checking the overall stability after the accidental event is created by the accidental combination is: respectively exhausting the combination with each intermediate type under the variable load according to the intermediate working condition under the intermediate type of constant load, wherein when only one intermediate type of the variable load exists in the combination formula, the intermediate type is used as the dominant variable load, and when the intermediate types of the variable load exist in the combination formula, the intermediate type of each variable load is used as the dominant variable load in turn; step S316, creating a load combination formula of the standard combination: the combination of the intermediate types under the variable load is exhausted under the intermediate working condition of the intermediate type constant load at the moment, when only one intermediate type of the variable load exists in the combination formula, the intermediate type is used as the dominant variable load, and when the intermediate types of the variable load of 2 or more exist in the combination formula, the intermediate type of each variable load is used as the dominant variable load in turn; step S317, creating a load combination formula of frequency combination, exhausting the combination with each intermediate type under the variable load according to the intermediate working condition of the intermediate type of 'dead load' at the moment, wherein when the combination formula only has one intermediate type of the variable load, the intermediate type is used as the dominant variable load, and when the combination formula has 2 or more intermediate types of the variable load, the intermediate type of each variable load is used as the dominant variable load in turn; and S318, creating a load combination formula of the quasi-permanent combination, and exhausting the combination of each intermediate type under the variable load according to the intermediate working condition of the intermediate type of constant load at the moment.

The concrete process of the step S32 is that step S321 is to create a basic combination formula under the general condition of earthquake design: the intermediate working conditions merged and input in the step S226 are used for exhausting the combination with each intermediate type under the action of the earthquake, and when the horizontal E and the vertical E exist in a formula at the same time, one of the horizontal E and the vertical E is considered as the dominant earthquake action in turn; step S322, creating a basic combination formula when the permanent effect under the earthquake design condition is beneficial to the structure: the intermediate working conditions merged and input in the step S227 are used for exhausting the combination with each intermediate type under the action of the earthquake, and when the horizontal E and the vertical E exist in a formula at the same time, one of the horizontal E and the vertical E is considered as the dominant earthquake action in turn; step S323, creating a standard combination formula of the earthquake design condition: the intermediate working conditions merged and input in the step S228 are used for exhausting the combination with each intermediate type under the action of the earthquake, and when the horizontal E and the vertical E exist in a formula at the same time, one of the horizontal E and the vertical E is considered as the dominant earthquake action in turn; and step S324, if the wind load is considered during earthquake, copying the combined formulas of the steps S321-S323, and directly adding the intermediate type wind load in brackets (I) (and II) (of each formula).

Step S4 is to substitute the intermediate condition into the intermediate type-based load combination formula, and the specific process is as follows: step S41, selecting a first formula from the combined formulas formed in step S3, directly copying if no intermediate type exists in the formula, and substituting the intermediate types in the formula with respective intermediate working condition turns to generate all possible intermediate working condition combined formulas when the intermediate types exist in the formula; step S42, selecting the next combination formula, and repeating the step S41 until the processing of each combination formula is completed; and S43, uniformly judging whether the logic relation among the intermediate working conditions set in the step S24 is met or not for all the intermediate working condition combination formulas generated in the steps S41-S42, and if not, deleting the intermediate working condition combination formulas. Step S44, selecting a first formula from the supplementary combined formulas of step S25, directly copying if no intermediate type exists in the formula, and substituting the intermediate types in the formula with respective intermediate working condition turns to generate all possible intermediate working condition combined formulas when the intermediate types exist in the formula; and step S45, selecting the next combination formula, and repeating the step S44 until the processing of each combination formula is completed.

The step S4 is characterized by: (1) the combined formula of the intermediate working condition is still in the form of a mathematical formula and is connected by symbols of plus and minus. (2) When the intermediate condition is substituted into the intermediate type, if the intermediate condition is not formed by directly referring to the load condition in step S1, the intermediate condition is enclosed by the bracket C. (3) When the intermediate working conditions are substituted into the intermediate types to form the intermediate working condition-based combined formula, brackets, { "," "and" in the original formula and a mark symbol ● for leading variable loads or leading earthquake action are reserved.

Step S5 is to fill the coefficient completely when the load conditions are combined in the combined formula according to the different types of the load combined formula and the requirements of the design specifications, and the specific process is as follows: step S51, selecting the first combination formula formed in step S4, if there are brackets "[ and ] in the formula: according to different types of combination formulas, filling coefficients required when the load working conditions participate in combination according to the requirements of design specifications before each load working condition in brackets (and) is filled, connecting a plurality of coefficients before each load working condition by multiplication numbers according to the requirements of the design specifications, and filling coefficients according to leading variable loads or leading earthquake action marked by ●; and S52, selecting the next formula, and repeating the step S51 until the filling of the coefficients of all the intermediate working condition combination formulas is completed.

The step S51 is characterized by: (1) when the coefficients required by the load combination are filled in the intermediate working condition combination formula, the categories of the load combination formula are divided into 8 types, 6 types are respectively basic combinations (when variable effect control and permanent effect are beneficial to the structure), basic combinations (when permanent effect control), accidental combinations, standard combinations, frequent combinations and quasi-permanent combinations under the non-seismic design condition, and 2 types are respectively basic combinations of the seismic design condition and standard combinations of the seismic design condition under the seismic design condition. (2) Filling in design service life adjustment coefficient gamma before load working condition_LWhen, if γ_LWhen 1.0, then, γ is not filled in_LInto a formula.

The specific process of "filling the coefficients required for the load conditions to participate in the combination according to the requirements of the design specifications before each load condition in brackets" [ and "] according to the difference of the types of the combination formulas in the step S51" is as follows: step S511, if the formula is basic combination (when the variable effect control and the permanent effect are beneficial to the structure), filling the subentry coefficient gamma of the load condition before the load condition marked by' ●_QDesign life adjustment coefficient gamma_LFilling gamma of the load condition before other load conditions_Q、γ_LAnd a combination value coefficient Ψ c; step S512, if the formula is the basic combination (in the permanent effect control), filling the subentry coefficient gamma of the load working condition before each load working condition_QDesign life adjustment coefficient gamma_LA combination value coefficient Ψ c; step S513, if the formula is accidental combination (used for calculating the bearing capacity limit state), filling a frequent value coefficient psi f of the load working condition before the load working condition marked by ●, and filling a quasi-permanent value coefficient psi q of the load working condition before other load working conditions; step S514, if the standard combination formula is adopted, the coefficient is not filled in before the load working condition marked with '●', and the combination value coefficient psi c of the load working condition is filled in before other load working conditions; step S515, if the frequency combination formula is adopted, filling a frequency value coefficient psi f of the load working condition before the load working condition marked by ●, and filling a quasi-permanent value coefficient psi q of the load working condition before other load working conditions; step S516, if the formula is a quasi-permanent value formula, filling a quasi-permanent value coefficient psi q of each load working condition before the load working condition; step S517, if the basic combination formula is in the earthquake design condition, filling the subentry coefficient gamma before the load working condition of variable load_QFilling the subentry coefficient determined in the step S15 before each load working condition belonging to the earthquake action; step S518, if the basic combination formula is in the earthquake design condition, filling a subentry coefficient gamma before the load working condition of variable load_QAnd the element coefficients determined in step S16 are filled in before each load condition pertaining to the seismic action.

Step S6 is to calculate the coefficient of the load condition in the load combination formula to form the final load combination result, and after the classification, the elimination, the supplement and the modification are repeated, the final result is saved, which specifically includes: s61, selecting the first combination formula formed in the step S5, and calculating coefficients of all load working conditions participating in the combination according to a mathematical operation rule; s62, selecting the next formula, and repeating the step S61 until the calculation of the load working condition coefficients in all the combined formulas is completed; step S63, according to the different types of the combination formulas, checking and deleting the repeated combination formulas in each type of combination; step S64, supplementary modification is carried out on the combined formula; and step S65, numbering and naming the combined formulas in sequence, and storing or writing the load combined result into a data file which can be identified by the structural analysis software in a text form.

The step S61 is characterized by: when the connection sign before the load working condition is 'minus', the coefficient when the load working condition participates in combination is a negative value, otherwise, the coefficient is a positive value.

The step S63 is characterized by: when the repeated combination formulas are checked in a classified manner and deleted, the categories of the load combination formulas are also divided into 8 types, but different from the categories when the coefficients are filled in the step S51, 6 types in the non-earthquake design condition are respectively a basic combination, an accidental combination (for carrying capacity limit state calculation), an accidental combination (for overall stability verification after an accidental event), a standard combination, a frequent combination and a quasi-permanent combination, and 2 types in the earthquake design condition are respectively a basic combination of the earthquake design condition and a standard combination of the earthquake design condition.

In a certain industrial structure, STAAD.PRO calculation is adopted (in the STAAD.PRO, an X axis and a Z axis are in a plane direction, and a Y axis is a vertical axis), and a load working condition and a load combination are planned to be created and then written into a data file, std, of the STAAD.PRO. Coefficient of structural importance gamma₀1.1, constant load DL, prestress PR, accidental loads Ac1 and Ac2, floor live load LL, design service life adjustment coefficient of 1.03, equipment and pipeline load LLE are considered according to variable loads, horizontal force LL1 of equipment and pipelines and resultant force direction are + X and + Z direction at starting, horizontal force LL2 of equipment and pipelines and resultant force of horizontal force are + X and + Z direction at normal operation, horizontal force LL3 of equipment and pipelines and resultant force direction are-X and-Z direction at stopping (horizontal force LL1, LL2 and LL3 are all input according to live load), temperature action T1 at structure temperature rising and temperature falling, t2, wind load WL (+ X wind direction), WB (+ Z wind direction), WR (-X wind direction), WF (-Z wind direction), horizontal earthquake action Ex and Ez, vertical earthquake action Ey, floor live load LLJ during maintenance, maintenance load JX1 (maintenance of equipment 1) and JX2 (maintenance of equipment 2). Requirements for forming a load combination: directly multiplying the structural importance coefficient into a load combination formula, not combining the temperature load and the wind load simultaneously, only considering the combination of the earthquake action and the wind load during normal operation, and forming a basic combination (the combination of the earthquake action and the wind load during the overhaul of the equipment 1) and a standard combination (the equipment) during the overhaul2 not combined with wind for maintenance).

(1) Load conditions are created and the coefficients required for the combination are input.

Setting a structural importance coefficient gamma₀1.1. Establishing a load working condition DL, numbering 1, and setting the load type as a permanent load; establishing a load working condition PR with the number of 2, and setting the load type as a permanent load; establishing load working conditions Ac1 and Ac2, wherein the serial numbers are 3 and 4 respectively, and setting the load type as accidental load; establishing a load working condition LL with the number of 5, setting the load class as a variable load, and further setting the subentry coefficient as gamma_Q1.4, the combination value coefficient psi c is 0.7, the frequency coefficient psi f is 0.6, the quasi-permanent value coefficient psi q is 0.5, and the design service life adjusting coefficient is adjusted from the default value gamma_LModified as 1.0 to γ_L1.03 percent; establishing load working condition LLE with the number of 6, setting the load type as variable load, and further setting the subentry coefficient as gamma_QThe combined value coefficient ψ c is 0.95, the frequency coefficient ψ f is 0.9, the quasi-permanent value coefficient ψ q is 0.85, and the default value γ of the age adjustment coefficient is designed to be 1.4_L1.0 as unmodified; creating a load working condition LL1 with the number of 7, setting the load class as variable load, and further setting the subentry coefficient as gamma_QThe combined value coefficient ψ c is 0.95, the frequency coefficient ψ f is 0.9, the quasi-permanent value coefficient ψ q is 0.85, and the default value γ of the age adjustment coefficient is designed to be 1.4_L1.0 as unmodified; creating a load working condition LL2 with the number of 8, setting the load class as variable load, and further setting the subentry coefficient as gamma_QThe combined value coefficient ψ c is 0.95, the frequency coefficient ψ f is 0.9, the quasi-permanent value coefficient ψ q is 0.85, and the default value γ of the age adjustment coefficient is designed to be 1.4_L1.0 as unmodified; creating a load working condition LL3 with the number of 9, setting the load class as variable load, and further setting the subentry coefficient as gamma_QThe combined value coefficient ψ c is 0.95, the frequency coefficient ψ f is 0.9, the quasi-permanent value coefficient ψ q is 0.85, and the default value γ of the age adjustment coefficient is designed to be 1.4_L1.0 as unmodified; creating load working conditions T1 and T2 with the numbers of 10 and 11 respectively, setting the load type as variable load, and further setting the polynomial coefficient as gamma_Q1.4, the coefficient psi c is 0.6, the frequency coefficientThe coefficient ψ f is 0.5, the quasi-permanent value coefficient ψ q is 0.4, and the default value γ of the age adjustment coefficient is designed_L1.0 as unmodified; establishing load working conditions WL, WF, WR and WB with the numbers of 12, 13, 14 and 15 respectively, setting the load type as wind load, and further setting the subentry coefficients as gamma_QThe combined value coefficients psi c and psi f are 0.4, the quasi-permanent value coefficients psi q are 0, and the default value gamma of the service life adjusting coefficient is designed_L1.0 as unmodified; load working conditions Ex, Ey and Ez are created, the numbers are respectively 16, 17 and 18, the Ex category and the Ez category are set to be horizontal seismic action, and the Ey category is set to be vertical seismic action. Establishing a load working condition LLJ, setting the load type as variable load and the serial number as 19, and further setting a subentry coefficient gamma_QThe combination value coefficient ψ c is 1.4, the frequency coefficient ψ f and the quasi-permanent value coefficient ψ q are not set because they are not used, and the default value γ of the age adjustment coefficient is designed_L1.0 as unmodified; creating load working conditions JX1 and JX2, setting the load types as variable loads, and setting the serial numbers as 20 and 21 respectively, and further setting a polynomial coefficient gamma_QThe combination value coefficient ψ c is 1.0, the frequency coefficient ψ f and the quasi-permanent value coefficient ψ q are not set because they are not used, and the default value γ of the age adjustment coefficient is designed_L1.0 as unmodified;

setting the subentry coefficient of the seismic action when the seismic design conditions are basically combined: because of the existence of horizontal seismic action, the horizontal seismic action is set as the subentry coefficient gamma of the horizontal seismic action when the horizontal seismic action is dominant_Eh1.3, the sub-coefficient gamma of the vertical seismic action at this time_Ev0.5; because of the vertical earthquake action, the vertical earthquake action is set as the subentry coefficient gamma of the vertical earthquake action when the vertical earthquake action is dominant_Ev1.3, the sub-coefficient gamma of the horizontal seismic action at this time_Eh＝0.5。

Setting the subentry coefficient of the seismic action when the seismic design condition standard is combined: because of the existence of horizontal seismic action, the horizontal seismic action is set as the subentry coefficient gamma of the horizontal seismic action when the horizontal seismic action is dominant_Eh1.0, the sub-coefficient gamma of the vertical seismic action_Ev0.4; due to the vertical earthquake action, the device is arrangedThe subentry coefficient gamma of the vertical earthquake action when the vertical earthquake action is the dominant earthquake action_Ev1.0, the sub-coefficient gamma of the horizontal seismic action_Eh＝0.4。

And because the wind load is required to participate in the earthquake combination, the combination value coefficient when the wind load participates in the earthquake action combination is modified from the default value psi w-0 to be 0.2.

The effect of the gravity load representative value Sge is created in the form of a mathematical formula, where Sge is "1.0 DL +0.7LL +0.9 LLE" in this embodiment.

(2) Creating intermediate types and intermediate working conditions, and setting a logic relationship between the intermediate types, a logic relationship between the intermediate working conditions and a supplementary load combination formula.

The intermediate working condition is a load working condition which is taken as an independent working condition to participate in the load combination, and is formed after the load working conditions which can be combined together as the independent working condition to participate in the load combination are combined as much as possible. The intermediate type is a classification of intermediate conditions. In the invention, an intermediate type is respectively established no matter the number of permanent loads and accidental loads under specific load working conditions; creating an intermediate type of horizontal seismic action and an intermediate type of vertical seismic action according to actual conditions for seismic action; and creating one or more intermediate types according to the actual situation of engineering under the variable load. In this embodiment, LLE is the load of the equipment and the pipeline considered according to the variable load, and LL1, LL2, and LL3 are horizontal load conditions of the equipment and the pipeline during start-up, operation, and shutdown, so LLE, LL1, LL2, and LL3 are not likely to be combined as independent conditions, and should be combined into 3 intermediate conditions LLE + LL1, LLE + LL2, and LLE + LL3, and the 3 intermediate conditions are mutually exclusive, so they should belong to the same intermediate type. For the inspection load, if the load combination formula is to be automatically formed, a complex logic relationship needs to be set to eliminate the unnecessary combination formula, so the method of supplementing the combination formula is adopted in this embodiment. The remaining variable load floor live loads LL, temperature loads T1, T2, wind loads WL, WF, WR, WB can be divided into 3 intermediate types. It should be noted that the floor live load can be further combined with LLE + LL1, LLE + LL2, and LLE + LL3 to become the intermediate condition LL + LLE + LL1, LL + LLE + LL2, and LL + LLE + LL 3.

Therefore, an intermediate type is created under the permanent load and named as ' dead load ', an intermediate type is created under the ' accidental load ' and named as ' accidental ', an intermediate type is created under the variable load ' and named as ' live load ', ' equipment ', ' temperature ' and ' wind load ', an intermediate type is created under the ' seismic action ' due to the horizontal seismic action and named as ' horizontal E ', and an intermediate type is created under the ' seismic action ' due to the vertical seismic action and named as ' vertical E '.

And creating intermediate working conditions under the intermediate type of 'dead load', wherein corresponding intermediate working conditions are created according to different types of load combination formulas, and coefficients of the load working conditions are clear, for example, the intermediate working conditions corresponding to the basic combination under the permanent load effect control are 1.35DL +1.2PR, the intermediate working conditions corresponding to the basic combination under the permanent effect beneficial to the structure are three, namely 1.0DL +1.2PR, 1.2DL +1.0PR and 1.0DL +1.0 PR.

And creating intermediate working conditions under the intermediate type 'accidental', wherein corresponding intermediate working conditions are created according to different types of load combination formulas, and coefficients of the load working conditions are clarified, but because accidental loads only occur in accidental combinations when the accidental loads are used for calculating the bearing capacity limit state and do not occur in any other combination formulas, the specific intermediate working conditions Ac1 and Ac2 are only filled in the accidental combinations when the accidental loads are used for calculating the bearing capacity limit state.

Creating intermediate conditions under each intermediate type of variable load without distinguishing the categories of the load formula and without any coefficients: the intermediate operating conditions LL are created under an intermediate type "live load", the intermediate operating conditions LLE + LL1, LLE + LL2, LLE + LL3 corresponding to start-up, run, shut-down are created under an intermediate type "equipment", the intermediate operating conditions T1, T2 are created under an intermediate type "temperature", and the intermediate operating conditions WL, WF, WR, WB are created under an intermediate type "wind load".

Creating intermediate conditions under each intermediate type of seismic contribution, without any coefficients: creating intermediate operating conditions Ex, Ez under the intermediate type "horizontal E" and supplementing the inverted intermediate operating conditions-Ex, -Ez, creating intermediate operating conditions Ey under the intermediate type "vertical E" and supplementing the inverted intermediate operating conditions-Ey.

Since the combination of the earthquake action is considered only in the normal operation, and the horizontal forces PR and LL2 exist all the time in the normal operation, but PR and LL2 are not included when the gravity load representative value Sge is formed in the previous step, and therefore, they are input together in the intermediate condition where the permanent load and the variable load (including no wind load) are input. Corresponding to the general situation of basic combination of earthquake action, the intermediate working conditions of permanent load and variable load (not including wind load) are merged together and input, and the input is 1.2Sge +1.2PR +1.2 × 0.9LL 2; corresponding to the situation that when the basic combination of the earthquake action is beneficial to the structure due to the permanent effect, the gravity load representative value Sge and the prestress PR are considered to be beneficial to the structure independently, the intermediate working conditions of the permanent load and the variable load (not including the wind load) are combined together and input, and three possible situations are 1.0Sge +1.2PR +1.0 LL2, 1.2Sge +1.0PR +1.2 LL2 and 1.0Sge +1.0PR +1.0 LL2 respectively; corresponding to the standard combination of earthquake action, the intermediate working conditions of permanent load and variable load (not including wind load) are merged and input together, and the intermediate working conditions are 1.0Sge +1.0PR +1.0 × 0.9LL2, wherein the coefficients of the working conditions of each load are defined.

Setting the logical relationship between the intermediate types: since this embodiment requires that the temperature load not be combined with the wind load at the same time, the intermediate type wind load is set as "exclusive" intermediate type "temperature", i.e., "wind load! Temperature ".

Setting a logic relation between the intermediate working conditions: when the equipment load is combined with the wind load, the resultant force of the horizontal force in the starting and normal operation is only combined with WL and WB, and the resultant force of the horizontal force in the stopping operation is-X and-Z only combined with WR and WF, so LLE + LL1@ WL @ WB, LLE + LL2@ WL @ WB, LLE + LL3@ WR @ WF are arranged, and WL @ (LLE + LL1) @ (LLE + LL2), WB @ (LLE + LL1) @ (LLE + LL2), WR @ (LLE + LL3) and WF @ (LLE + LL3) are arranged, and the conditions indicate that the directions are 'one-way compatible'. It is worth noting that all the intermediate working conditions under the intermediate type 'equipment' all set the 'one-way compatibility in' concrete wind load intermediate working conditions, so that in this embodiment, WL @ (LLE + LL1) @ (LLE + LL2), WB @ (LLE + LL1) @ (LLE + LL2), WR @ (LLE + LL3), WF @ (LLE + LL3) are not set, at this time, the redundant combination can be completely deleted because the logical relationship between the intermediate working conditions is not satisfied, so that the setting of the 'one-way compatibility in' equipment intermediate working conditions in the wind load intermediate working conditions is omitted.

In the embodiment, the combination of earthquake action and wind load needs to be considered, and the same-direction superposition only needs to be considered generally, so that the left wind WL @ Ex, the rear wind WB @ Ez, the right wind WR @ (-Ex), and the front wind WF @ (-Ez) are set, and the Ex @ WL, Ez @ WB, -Ex @ WR, -Ez @ WF are set. It is to be noted that, since all the intermediate working conditions under the intermediate type of "wind load" are set to a specific horizontal seismic working condition of "one-way compatibility", Ex @ WL, Ez @ WB, -Ex @ WR, and-Ez @ WF are not set in this embodiment, and at this time, the redundancy combination will not satisfy the logic between the intermediate working conditions

TABLE 1

The relation is completely deleted, so that the setting that the middle working condition of the horizontal earthquake action is unidirectionally compatible with the wind load middle working condition is omitted.

For the maintenance condition, the present embodiment selects the mode of supplementing the load combination formula. The combination format of the basic combination and the standard combination is supplemented according to the requirements of the embodiment and the format of the intermediate type combination formula or the intermediate working condition combination formula. For example, a basic combination formula "1.2 DL +1.2PR + [ LLJ + ● JX1+ wind load ]", where DL, PR, LLJ, JX1 are load conditions, "wind load" is an intermediate type indicating that the intermediate condition turns with "wind load" are substituted into the corresponding intermediate condition combination formula, the load conditions in brackets "[ and" ] indicate the coefficients required to automatically fill in the load combination according to the category of the formula in the following step, and JX1 is preceded by a black dot "●" indicating that JX1 is the dominant variable load. It is noted that the structural importance coefficient γ is not multiplied in this formula₀If the engineer needs to consider the structural importance factor of 1.1 at this time, then we shall write "1.1 {1.2DL +1.2PR + [ LLJ + ● JX1+ wind load } when supplementing this formula.

Through the operation of this step, the results of table 1 above can be obtained.

(3) A composition formula based on the intermediate type is created.

Creating a load combination formula of the basic combination in the variable effect control: at this time, the intermediate working condition of the intermediate type of constant load only has 1 '1.2 DL +1.2 PR', the intermediate working condition is used for combining with the intermediate types of variable load, namely live load, equipment, temperature and wind load, and the condition that the intermediate type of each variable load is taken as the dominant variable load is also considered. In the generated combination formula, the load condition in brackets "[ and" ] indicates the coefficients required for the load combination to be automatically filled in by the software in the later step, and the black dot "●" indicates that the load is the dominant variable load, see table 2 below.

TABLE 2

Creating a load combination formula of the basic combination in the permanent effect control: at this time, the intermediate working condition of the intermediate type "dead load" only has 1 "1.35 DL +1.2 PR", and the intermediate working condition is used to exhaust the combination with the intermediate type "live load", "equipment", "temperature" and "wind load" of the variable load, as shown in table 3 below:

table 3:

creating a load combination formula for the basic combination when the permanent effect is beneficial to the structure: at this time, there are 3 intermediate working conditions of the intermediate type "dead load", and the combination of one of the intermediate working conditions with the intermediate type "live load", "equipment", "temperature", and "wind load" of the variable load is exhausted in a round, and the case where the intermediate type round of each variable load is taken as the dominant variable load is also considered, as shown in table 4 below:

table 4:

creating a contingent composition formula for bearer capability limit state calculation: at this time, the intermediate working condition of the intermediate type "dead load" is only DL + PR, the intermediate working condition of the intermediate type "occasional" is Ac1, Ac2, all possible combinations of the intermediate working condition under the "dead load" and the intermediate working condition under the "occasional" are DL + PR + Ac1, DL + PR + Ac2, the intermediate type "live load", "equipment", "temperature", and "wind load" combinations of DL + PR + Ac1, DL + PR + Ac2 with the variable load are exhausted respectively, and the intermediate type round of each variable load is also considered as the condition of dominating the variable load, as shown in table 5 below.

Table 5:

creating an contingency composition formula for the post-contingency structural integrity check: at this time, there are only 1 intermediate working condition of the intermediate type "dead load", which is the combination of the intermediate working condition and the intermediate type "live load", "equipment", "temperature" and "wind load" of the variable load, and the intermediate type turn of each variable load is also considered as the case of the dominant variable load, as shown in table 6 below.

Table 6:

creating a standard composition formula: at this time, the intermediate working condition of the intermediate type "dead load" has only 1 "DL + PR", the combination of the intermediate working condition and the intermediate type "live load", "equipment", "temperature" and "wind load" of the variable load is exhausted, and the intermediate type round of each variable load is also considered as the case of the dominant variable load, which is shown in table 7 below.

Table 7:

creating a frequency combination formula: at this time, the intermediate working condition of the intermediate type "dead load" has only 1 "DL + PR", the combination of the intermediate working condition and the intermediate type "live load", "equipment", "temperature" and "wind load" of the variable load is exhausted, and the intermediate type round of each variable load is also considered as the case of the dominant variable load, which is shown in table 8 below.

Table 8:

creating a quasi-permanent combinatorial formula: at this time, the intermediate working condition of the intermediate type of "dead load" is only 1 "DL + PR", and the combinations of the intermediate working condition and the intermediate type of "live load", "equipment", "temperature" and "wind load" of the variable load are exhausted, as shown in table 9 below.

Table 9:

creating a basic composition formula for the general case of seismic design conditions: the combination of the intermediate working conditions and each intermediate type under the action of the earthquake is exhausted due to the fact that the intermediate working conditions of the permanent load and the variable load (not including wind load) which are combined are only 1 piece of 1.2Sge +1.2PR +1.2 0.9LL 2', and when the horizontal E and the vertical E exist in the formula at the same time, one of the intermediate working conditions is considered as the dominant earthquake action and is marked with a symbol ● before the dominant earthquake action. Since this embodiment requires wind to be considered during earthquake, a combined formula of wind load participation should also be created, as shown in table 10 below.

Table 10:

creating a basic composition formula when the permanent effect under the seismic design condition is beneficial to the structure: the number of the intermediate working conditions of the input permanent load and the variable load (not including wind load) is combined into 3, 1 of the intermediate working conditions is exhausted to be combined with each intermediate type under the earthquake action, and when the horizontal E and the vertical E exist in the formula at the same time, one of the intermediate working conditions is considered as the dominant earthquake action. Since this embodiment requires wind to be considered during earthquake, a combined formula of wind load participation should also be created, as shown in table 11 below.

Table 11:

creating a standard compositional formula for seismic design conditions: the intermediate working conditions of the permanent load and the variable load are only 1 '1.0 Sge +1.0PR +1.0 0 x 0.9LL 2', the combination of the intermediate working conditions and each intermediate type under the action of the earthquake is exhausted, and when the 'horizontal E' and the 'vertical E' exist in one formula at the same time, one of the intermediate working conditions is considered as the dominant action of the earthquake in turn. Since this embodiment requires wind to be considered during earthquake, a combined formula of wind load participation should also be created, as shown in table 12 below.

Table 12:

because the implementation requires that the structural importance coefficient gamma 0 is multiplied in the load combination formula, the selected basic combination formula (not including the basic combination formula of the earthquake design condition) and the accidental combination formula for calculating the bearing capacity limit state are included by { 'and }, and the structural importance coefficient 1.1 is filled before the {' is filled.

And counting the logical relationship between the intermediate types, wherein the embodiment only has ' wind load ' and ' mutual exclusion ' temperatures ', so that the intermediate type combination formulas are subjected to traversal check, and the combination formulas in which the ' wind load ' and the ' temperature ' appear at the same time are deleted.

In this embodiment, the number of the intermediate working conditions in each intermediate type is equal to or greater than 1, so that there is no combination formula to be deleted.

It is to be noted that the intermediate type combination formulas in the above tables 2 to 12 are the results after adding brackets "{" } "multiplied by the structural importance coefficient γ 0 and deleting a combination formula which does not satisfy the logical relationship between the intermediate types, wherein the deleted combination formula is indicated by a cross-hatching.

To this end, an intermediate type based load combination formula is created. It is noted that not every intermediate type of combinatorial formula will have an intermediate type, e.g., only dead load combinatorial formula has no intermediate type, and artificially supplemented combinatorial formulas may also have no intermediate type.

(4) A combined formula based on the intermediate operating conditions is created.

And selecting a first load combination formula based on the intermediate type, directly copying if the formula has no intermediate type, or substituting the intermediate working condition turns under the intermediate type into all possible intermediate working condition combination formulas until the processing of the load combination formulas of all the intermediate types is completed. Then, the logic relation between the intermediate working conditions is uniformly checked for each intermediate working condition combination formula (the combination formula not including the artificial supplement), and the combination formula which does not meet the logic relation is deleted.

Only three intermediate type combination formulas are taken as examples, wherein the intermediate type combination formulas comprise "1.1 {1.2DL +1.2PR + [ ● live load + device + wind load ]", "1.1 {1.2DL +1.2PR + [ live load + ● device + wind load ]", "1.1 {1.2DL +1.2PR + [ live load + device + ● wind load }", the intermediate type "live load" only has 1 intermediate working condition LL, the intermediate type "device" has 3 intermediate working conditions LLE + LL1, LLE + LL2 and LLE + LL3, and the intermediate type "wind load" has 4 intermediate working conditions WL, WF, WR and WB, so that each intermediate type combination formula has 1x3x4 which is 12 based on the intermediate working conditions. When the logical relationship between the intermediate conditions is checked, the combination formula which does not satisfy the logical relationship between the intermediate conditions is deleted because LLE + LL1 "is unidirectionally compatible with" WL and WB ", LLE + LL 2" is unidirectionally compatible with "WL and WB", and LLE + LL3 "is unidirectionally compatible with" WR and WF ", that is, LLE + LL1 is only combined with WL or WB under the intermediate type" wind load ", LLE + LL2 is only combined with WL or WB under the intermediate type" wind load ", and LLE + LL3 is only combined with WR or WF under the intermediate type" wind load ", and the remaining 3x6 is 18 intermediate condition combination formulas, as shown in table 13 below.

Table 13:

(5) and filling load coefficients in the intermediate working condition combination formulas.

According to different types of combination formulas, the coefficients required when the load conditions participate in combination are filled in according to the requirements of design specifications before each load condition in brackets (and), and then brackets (and), and a mark symbol (●) for leading variable loads or leading earthquake action are removed from the formula. The categories of the load combination formula are divided into 8 types, and 6 types are basic combinations in the non-earthquake design condition (in the variable effect control process and in the variable effect control process)When the permanent effect is beneficial to the structure), basic combination (permanent effect control), accidental combination, standard combination, frequent combination and quasi-permanent combination, and 2 combinations are respectively the basic combination of the earthquake design condition and the standard combination of the earthquake design condition in the earthquake design condition. Filling in design service life adjustment coefficient gamma before load working condition_LWhen, if γ_LWhen 1.0, then, γ is not filled in_LInto a formula.

Taking the filling of 18 intermediate condition combination formula coefficients formed by the above example of 3 intermediate type combination formulas as an example, since the categories of the 18 load combination formulas are all basic combinations in variable effect control, the subentry coefficient γ of the load condition is filled before each load condition in brackets (and) is filled_QDesign life adjustment coefficient gamma_LAnd a combined value coefficient psi c, the coefficients are connected with each other by '+', psi c is not filled in before the load working condition marked by '●', and gamma is not filled in before the load working condition is marked_LUnfilled γ of 1.0_LSee table 14 below.

Table 14:

(6) at this point, the coefficient of each load condition in each formula when the load conditions participate in combination can be calculated according to the mathematical operation rules, after repeated combination formulas are checked in a classified mode, supplementary modification can be carried out, and finally the combination formulas are numbered and named in sequence and written into the source file 'std' of the STAAD.

The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed. Those skilled in the art to which the invention pertains will appreciate that insubstantial changes or modifications can be made without departing from the spirit of the invention as defined by the appended claims.

Claims

1. A method of forming a load combination, characterized by:

step S3, automatically classifying and creating an intermediate type combination formula based on the intermediate type in the form of a mathematical formula, and automatically deleting the combination formula which does not meet the logic relationship between the intermediate types; the specific process of the step S3 is that the step S31 creates an intermediate type combination formula when the non-seismic design condition is created: according to different types of load combination formulas, the intermediate working conditions of permanent loads and accidental loads corresponding to the combination formulas are exhausted to be combined with the intermediate types of the variable loads, and when the intermediate type combination formulas need to consider the situation that all the variable loads can be used as the dominant variable loads, the intermediate types of all the variable loads are used as the dominant variable loads in turn; step S32, creating an intermediate type combination formula in the earthquake design condition: according to different types of load combination formulas, combining the input permanent loads and the variable load intermediate working conditions excluding wind loads, and exhausting the intermediate type combination with the earthquake action; if wind load needs to be considered during earthquake, the combined permanent load and the intermediate working condition of the variable load excluding the wind load are added with the intermediate type of the wind load, and then the combination of the permanent load and the intermediate type of the earthquake action is exhausted; when the horizontal seismic action and the vertical seismic action exist in the combined formula at the same time, the middle type of the horizontal seismic action and the middle type of the vertical seismic action are used as the main seismic action in turn; step S33, if the structure importance coefficient gamma 0 needs to be multiplied into the load combination formula, selecting the corresponding combination formula, including the combination formula by the bracket A and multiplying the value of gamma 0 outside the bracket; step S34, after the logic relationship between the intermediate types is counted, traversing and checking the intermediate type combination formula, and deleting the combination formula which does not meet the logic relationship between the intermediate types; step S35, checking the number of the middle working conditions under each middle type, if there is a middle type with the number of the middle working conditions being zero, traversing the middle type combination formula for checking, and deleting the combination formula with the middle type;

2. The method of forming a load combination of claim 1, wherein: the specific process of step S2 is as follows: step S21, classifying the load working condition into 4 types of permanent load, accidental load, variable load and earthquake action, and respectively establishing and naming the intermediate type of the load under the 4 types of load; step S22, under each intermediate type, creating one or more intermediate working conditions in the form of mathematical formulas; step S23, setting logic relations among the intermediate types, setting specific logic relations among the intermediate types which must appear simultaneously, and setting specific logic relations among the intermediate types which cannot appear simultaneously; s24, setting logic relations between intermediate working conditions which do not belong to the same intermediate type, setting specific logic relations between the intermediate working conditions which must occur simultaneously, setting specific logic relations between the intermediate working conditions which cannot occur simultaneously, and setting specific logic relations between the intermediate working conditions and the intermediate working conditions when one intermediate working condition can only be combined with one intermediate working condition of another intermediate type; step S25, creating a supplemental load combination formula by classification in the format of the combination formula of step S3 or S4.

3. A method of forming a load combination according to claim 2, wherein: in the steps S21-S22: (1) non-seismic design conditions: respectively creating an intermediate type for the permanent load and the accidental load, respectively creating corresponding intermediate working conditions according to different types of the load combination formula, determining the coefficient of each load working condition in the mathematical expression of the intermediate working conditions, and not distinguishing the type of the load combination formula for the intermediate working conditions of the variable load and not containing any coefficient; (2) during earthquake design conditions: respectively creating an intermediate type and a subordinate intermediate working condition without any coefficient for the horizontal earthquake action and the vertical earthquake action in the earthquake action, combining the intermediate working condition of the permanent load and the intermediate working condition of the variable load without the wind load according to the difference of the load combination formula types for the permanent load and the variable load without the wind load, and determining the coefficient of each load working condition in the mathematical expression of the intermediate working condition; (3) for load conditions including wind loads and seismic effects, reverse load conditions not created at step S1 need to be supplemented completely in creating intermediate conditions.

4. The method of forming a load combination of claim 1, wherein: in step S3, the intermediate type in each combination formula is enclosed by bracket B, and a special mark D is added before the intermediate type that dominates the variable load or the intermediate type that dominates the seismic action.

5. The method of forming a load combination of claim 4, wherein: in step S31, the combination with the intermediate types of the variable load is exhausted, and all the intermediate types belonging to the variable load do not participate in the combination, only 1 participation combination, two rounds of superposition participation combination, three rounds of superposition participation combination, and so on are considered until all the intermediate types of the variable load participate in the combination.

6. The method of forming a load combination of claim 5, wherein: in the step S32, the intermediate types of combinations with the seismic action are exhausted, and only the horizontal seismic action is involved in the combination, only the vertical seismic action is involved in the combination, and the horizontal and vertical seismic actions are simultaneously involved in the combination, but the case where the seismic action is not involved in the combination is not considered.

7. The method of forming a load combination of claim 6, wherein: in step S3, when the intermediate condition is substituted into the intermediate type, if the intermediate condition is not formed by directly referring to the load condition in step S1, the intermediate condition is enclosed by a bracket C.

8. The method of forming a load combination of claim 7, wherein: the specific process of step S4 is as follows: step S41, selecting a first formula from the intermediate type combination formulas formed in the step S3, directly copying if no intermediate type exists in the formula, and substituting the intermediate types in the formula into all possible intermediate working condition combination formulas according to respective intermediate working condition turns when the intermediate type exists in the formula; step S42, selecting the next combination formula, and repeating the step S41 until the processing of each intermediate type combination formula is completed; step S43, uniformly judging whether the logic relation between the intermediate working conditions is met or not for all the intermediate working condition combination formulas generated in the steps S41-S42, and if not, deleting the intermediate working condition combination formulas; step S44, selecting a first formula from the supplementary combined formulas of step S25, directly copying if no intermediate type exists in the formula, and substituting the intermediate types in the formula with respective intermediate working condition turns to generate all possible intermediate working condition combined formulas when the intermediate types exist in the formula; step S45, selecting the next combination formula, and repeating step S44 until the processing of each complementary combination formula is completed.

9. The method of forming a load combination of claim 8, wherein: the specific process of step S5 is as follows: step S51, selecting the first intermediate working condition combination formula formed in step S4, if there is a bracket B in the formula: filling in coefficients required by the load working conditions to participate in combination before each load working condition in the bracket B according to different types of the combination formulas, wherein the coefficients are connected by a multiplication sign '+' and are filled with coefficients according to the leading variable load or the leading earthquake action with a special mark D; and S52, selecting the next formula, and repeating the step S51 until the filling of the coefficients of all the intermediate working condition combination formulas is completed.

10. The method of forming a load combination of claim 9, wherein: the specific process of step S6 is as follows: s61, selecting the first combination formula formed in the step S5, and calculating coefficients of all load working conditions participating in the combination according to a mathematical operation rule; s62, selecting the next formula, and repeating the step S61 until the calculation of the load working condition coefficients in all the combined formulas is completed; step S63, according to the different types of the combination formulas, checking and deleting the repeated combination formulas in each type of combination; step S64, supplementary modification is carried out on the combined formula; and step S65, numbering and naming the combined formulas in sequence, and storing or writing the load combined result into a data file which can be identified by the structural analysis software in a text form.