JP2010152857A - System, method and program for designing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To drastically reduce the time and effort required to design a framed structure. <P>SOLUTION: The structure design system includes: a storing means for previously storing cross-section-shaped data of a member to which the cross-section area of a member to be used in a framed structure is related; a means for setting a temporarily determined cross-sectional shape of each member in FEM (Finite Element Method) analysis model data of a framed structure prepared in advance; a means for reading the FEM analysis model data with the cross-sectional shape set therein, using the FEN analysis model data to execute FEM analysis and calculating the strength of the each member; and a means for determining whether the calculated strength of the each member satisfies a strength condition, selecting a cross-section-shaped member in which the cross-sectional area of the member data stored in the storing means is larger than the cross-sectional area at the present time concerning a member that does not satisfy the strength condition, setting the selected cross-sectional shape in the FEM analysis model data, and repeating processing for obtaining the strength of the each member again by an analysis executing means, thereby optimizing a framed structure design. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a structural design system, a structural design method, and a structural design program for performing an optimized design of a structure based on the results of numerical analysis.

In the design work of structures such as frame structures and plate-frame structures, the cross-sectional shape of the members that make up the structure is assumed based on the experience of the operator, and this hypothetical cross-sectional shape is used to perform the finite element method. Modeling for structural analysis is performed to determine the sectional force (bending moment and shearing force) acting on each member, and the stress generated in the member is calculated from this sectional force and the member's cross section. If it is within the range, it is acceptable, and if it is equal to or greater than the allowable value, the section of the member is slightly enlarged and the same process is repeated again.
In addition, as a prior art, in an optimization design device using genetic search method, it is possible to perform automatic calculation and obtain an optimal solution in an actual design problem where the number of design variable data is enormous. In addition, an optimization design apparatus that can implement a highly accurate optimal frame structure design and improve the safety and reliability of the frame structure is known (see, for example, Patent Document 1).

JP 2001-134628 A

  However, in a large-scale structure, since the number of members reaches several thousand, in order to optimize the design of each member, the above-described procedure must be repeated many times. There is a problem that it takes a lot of work and time. In addition, since optimization design is performed based on the experience of the operator, there is a problem that it is difficult to determine whether or not the optimization has been achieved.

  The present invention has been made in view of such circumstances, and can greatly reduce the time and effort required to design a structure, and a structure design system and a structure design method capable of reliably performing an optimized design. And to provide a structural design program.

  The present invention provides a structural design for optimizing the structure based on the result of the strength evaluation of the structure using the analysis model data of the structure having at least one of the frame structure and the plate frame structure. A system that is a member data storage means in which cross-sectional shape data in which a member that can be used in the structure and a cross-sectional area of the member are related is stored in advance, and analysis of the structure that has been created in advance For model data, the section shape assumption means that temporarily sets the section shape of each member that constitutes the structure, and the analysis model data in which the section shape is set are read, and the analysis is performed using the analysis model data Analysis execution means for obtaining the strength of each member, and determining whether the strength of each member obtained by the analysis execution means satisfies a strength condition, Thus, until the strength of each of the members thus obtained satisfies the strength condition, there is provided optimization means for replacing the member that did not satisfy the strength condition with a member having a larger cross-sectional area selected from the cross-sectional shape data. To do.

  According to the present invention, the optimization means has a smaller cross-sectional area selected from the cross-sectional shape data when the strength required by the analysis execution means for all the members satisfies the strength condition. It is characterized by replacing with the member.

  In the present invention, when there are a plurality of types of members that can be used in the structure, the members that store cross-sectional shape data in which the cross-sectional areas of the members and the members are related for each type of the members. A data storage unit is provided, and the optimization unit replaces the member with a member of the same type when the member is replaced.

  In the present invention, when the structure includes a plate member and a reinforcing member that reinforces the plate member, the optimization unit replaces the plate member when at least one of the plate member and the reinforcing member is replaced. The positional relationship with the reinforcing member is corrected.

  According to the present invention, when the structure includes a plate member and a reinforcing member that reinforces the plate member, the optimization means performs the analysis when the plate member and / or the reinforcing member are replaced. The effective width used for calculating the strength of the reinforcing member is corrected by the execution means.

  The present invention provides a structural design for optimizing the structure based on the result of the strength evaluation of the structure using the analysis model data of the structure having at least one of the frame structure and the plate frame structure. A method for preliminarily setting a cross-sectional shape of each member constituting the structure with respect to the analysis model data of the structure prepared in advance, and the analysis model in which the cross-sectional shape is set An analysis execution step for reading data and performing analysis using the analysis model data to determine the strength of each member, and whether or not the strength of each member determined by the analysis execution step satisfies a strength condition Until the strength of each member obtained by the analysis execution step satisfies the strength condition, the member that does not satisfy the strength condition is used for the structure. It is characterized by having an optimization step of replacing the member of larger cross-sectional area than selecting from a cross-sectional shape data and cross-sectional area associated a capable member and the member.

  According to the present invention, in the optimization step, when the strength obtained by the analysis execution step in all the members satisfies the strength condition, a member that has not been replaced is selected from the sectional shape data. It is characterized by replacing with the member.

  According to the present invention, when there are a plurality of types of members that can be used in the structure, when the members are replaced in the optimization step, the members are separated from each other for each type of the members. The member is replaced with a member of the same type based on cross-sectional shape data associated with the area.

  In the case where the structure includes a plate member and a reinforcing member that reinforces the plate member, the plate member is replaced when at least one of the plate member and the reinforcing member is replaced in the optimization step. The positional relationship with the reinforcing member is corrected.

  In the present invention, when the structure includes a plate member and a reinforcing member that reinforces the plate member, the analysis is performed when at least one of the plate member and the reinforcing member is replaced in the optimization step. In the execution step, the effective width used for calculating the strength of the reinforcing member is corrected.

  According to the present invention, optimization design of a structure is performed based on a result of strength evaluation of the structure using a computer having analysis model data of a structure having at least one of a frame structure and a plate bone structure. This is a structural design program to be executed, and for the analytical model data of the structure created in advance, a sectional shape assumption step for temporarily setting the sectional shape of each member constituting the structure, and the sectional shape is set. The analysis model data is read, the analysis is performed using the analysis model data, the analysis execution step for obtaining the strength of each member, and the strength of each member obtained by the analysis execution step satisfies the strength condition. The strength condition is not satisfied until the strength of each of the above members determined by the analysis execution step satisfies the strength condition. Causing the computer to execute an optimization step of replacing the member with a member having a larger cross-sectional area selected from cross-sectional shape data in which the member usable in the structure and the cross-sectional area of the member are related to each other. It is characterized by.

  According to the present invention, in the optimization step, when the strength obtained by the analysis execution step in all the members satisfies the strength condition, a member that has not been replaced is selected from the sectional shape data. It is made to replace with the member of.

  According to the present invention, when there are a plurality of types of members that can be used in the structure, when the members are replaced in the optimization step, the members are separated from each other for each type of the members. The member is replaced with a member of the same type based on the cross-sectional shape data associated with the area.

  In the case where the structure includes a plate member and a reinforcing member that reinforces the plate member, the plate member is replaced when at least one of the plate member and the reinforcing member is replaced in the optimization step. The positional relationship with the reinforcing member is corrected.

  In the present invention, when the structure includes a plate member and a reinforcing member that reinforces the plate member, the analysis is performed when at least one of the plate member and the reinforcing member is replaced in the optimization step. In the execution step, the effective width used for calculating the strength of the reinforcing member is corrected.

  According to the present invention, since the structural analysis is repeated until all members pass based on the assumed initial cross-sectional shape, it is possible to greatly reduce the labor required for the structural design and to perform a high-quality structural design. The effect that it becomes possible is acquired. In addition, since the cross-sectional shape of the passed member is made as small as possible, an effect that the optimization design can be surely performed is also obtained.

It is a block diagram which shows the structure of 1st Embodiment of this invention. It is a flowchart which shows operation | movement of the frame structure design system 1 shown in FIG. It is a flowchart which shows detailed operation | movement of the buckling length setting part 14 shown in FIG. It is a flowchart which shows the detailed operation | movement of the grouping process part 13 shown in FIG. It is explanatory drawing which shows the table structure of the H-section steel data storage part shown in FIG. It is explanatory drawing which shows operation | movement of the buckling length setting part 14 shown in FIG. It is explanatory drawing which shows an example of the model data for FEM analysis of a frame structure. It is a block diagram which shows the structure of 2nd Embodiment of this invention. It is a perspective view which shows the plate bone and rib which comprise the plate frame structure in which strength evaluation is performed by the plate frame structure design system 4 shown in FIG. It is sectional drawing which shows the plate bone and rib which comprise the plate frame structure by which strength evaluation is performed by the plate frame structure design system 4 shown in FIG. It is a flowchart which shows operation | movement of the plate frame structure design system 4 shown in FIG.

(First embodiment)
Hereinafter, a frame structure design system, a frame structure design method, and a frame structure design program as embodiments of the structure design system, the structure design method, and the structure design program of the present invention will be described.

FIG. 1 is a block diagram showing the configuration of the framework structure design system of this embodiment. In this figure, reference numeral 1 denotes a frame structure design system that performs an optimization design of a frame structure based on the result of FEM (Finite Element Method) analysis, and includes a computer device.
The framework structure design system 1 performs an optimization design of the framework structure based on the result of the strength evaluation of the structure using the analysis model data of the structure having the framework structure.

  Reference numeral 2 denotes an input unit including a keyboard, a mouse, and the like. Reference numeral 3 denotes a display unit composed of a liquid crystal display device or the like.

Reference numeral 11 denotes a model creation unit that creates model data for FEM analysis based on information input from the input unit 2.
Further, the model creation unit 11 functions as a cross-sectional shape assumption unit of the present invention. For example, the cross-sectional shape of each member constituting the frame structure with respect to the analysis model data of the frame structure previously created (in advance). Is temporarily set or reset.

Reference numeral 12 denotes a model data storage unit that stores model data for FEM analysis created in the model creation unit 11.
Reference numeral 13 indicates a search for a member in which a plurality of members joined at nodes form one straight line from the model data created in the model creating unit 11 and a plurality of members forming one straight line. It is a grouping processing unit that groups a set of members that should be regarded as one member.
Reference numeral 14 denotes a buckling length setting unit that sets a buckling length of a member that should be regarded as one member grouped in the grouping processing unit 13.

Reference numeral 15 reads FEM analysis model data stored in the model data storage unit 12, executes FEM (Finite Element Method) analysis using the FEM analysis model data, and converts the frame structure into It is a FEM analysis part (analysis execution means) which calculates | requires the intensity | strength of each member to comprise.
Note that the strength of each member constituting the frame structure is a value that is uniquely determined by the stress and the amount of deformation in each element constituting the FEM analysis model data. For this reason, in this embodiment, it is assumed that the FEM analysis part 15 calculated | required the intensity | strength of each member which comprises a frame structure by performing FEM analysis and calculating | requiring the stress and deformation amount in each element.
The model creation unit 11 and the FEM analysis unit 15 store known FEM model generation software, FEM analysis software, and the like, and execute model creation and FEM analysis using the software.

Reference numeral 16 denotes a strength evaluation unit that performs a strength evaluation determination based on the stress and deformation amount of each element (that is, the strength of each member) obtained by the FEM analysis unit 15.
Reference numeral 17 can be used for a member (structure) defined by JIS (Japanese Industrial Standards) in order to change the cross-sectional shape of the member constituting the framework structure according to the evaluation result of the strength evaluation unit 16. A cross-sectional shape selection unit that selects a cross-sectional shape including a cross-sectional area of a member.
Reference numeral 18 denotes an evaluation result storage unit that stores information on strength evaluation in the strength evaluation unit 16.

Reference numerals 21 to 26 denote member data storage units in which cross-sectional shape data of members used in the frame structure defined by JIS are stored in advance. In the member data storage units 21 to 26, six types of cross-sectional shape data of H-shaped steel, I-shaped steel, square steel pipe, grooved steel, round steel pipe, and L-shaped steel are stored in advance.
Here, the member data storage unit shown in FIG. 1 will be described with reference to FIG. FIG. 5 is a diagram showing a table structure of the H-shaped steel data storage unit 21. JIS defines a plurality of H-shaped steels having different cross-sectional areas. And the H-shape steel data storage part 21 has memorize | stored the cross-sectional shape data in which the several H-section steel from which the area defined by JIS differs, and the cross-sectional area of the said H-shape steel were related, as shown in FIG. . Then, as shown in FIG. 5, the H-shaped steel data storage unit 21 stores a plurality of H-shaped steels having different areas by assigning sequential identification numbers so that the cross-sectional areas are in ascending order.
Note that the cross-sectional shape of the H-shaped steel defined by JIS is defined by the dimensions of H (height) × B (width), t1 (web thickness), and t2 (flange thickness). In this embodiment, the H-shaped steel data storage unit 21 stores the above dimensions in association with each H-shaped steel (each identification number) as part of the cross-sectional shape data. Further, the H-shaped steel data storage unit 21 associates with each H-shaped steel (each identification number), the cross-sectional secondary moment value of each of the H-shaped steel, the Y-axis, the torsional moment value, the Z-axis, the Y-axis. Each shear area value is stored as part of the cross-sectional shape data.
For other members (I-shaped steel, square steel pipe, grooved steel, round steel pipe, L-shaped steel), cross-sectional shape data is stored in advance in each member data storage unit by the same table structure, and the cross-sectional areas are in ascending order. Thus, an identification number is assigned. That is, the frame structure design apparatus of the present embodiment stores a plurality of types of members that can be used in the frame structure, and stores cross-sectional shape data in which the cross-sectional areas of the members and the members are related to each type of member. A plurality of member data storage units are provided.

  In such a framework structure design system 1 of the present embodiment, the model creation unit 11, the model data storage unit 12, the strength evaluation unit 16, the cross-sectional shape selection unit 17, and the evaluation result storage unit 18 are obtained by FED analysis. It is determined whether or not the strength of each member satisfies the strength condition, and the member that does not satisfy the strength condition is selected from the cross-sectional shape data until the strength of each member obtained by the analysis FED analysis satisfies the strength condition. Replace with a member with a cross-sectional area. That is, in the framework structure design system 1 of the present embodiment, the model creation unit 11, the model data storage unit 12, the strength evaluation unit 16, the cross-sectional shape selection unit 17, and the evaluation result storage unit 18 constitute optimization means in the present invention. is doing.

Next, with reference to FIG. 2, the operation (structure design method) of the frame structure design system 1 shown in FIG. 1 will be described. FIG. 2 is a flowchart showing the operation of the framework structure design system 1 shown in FIG.
First, based on information input by the operator operating the input unit 2, the model creation unit 11 generates FEM analysis model data of a structure having a framework structure (for example, a structure as shown in FIG. 7). Create (step S1). Note that the FEM analysis model data includes information for specifying the type and cross-sectional area of members used for the frame structure. The model creation unit 11 determines the type of member to be used (H-shaped steel, I-shaped steel, square steel pipe, channel steel, round steel pipe, L-shaped steel) and the cross-sectional area based on information input by the operator via the input unit 1. It is set by selecting and reading out the cross-sectional shape data stored in the member data storage units 21-26.
For example, if the member to be used is an H-shaped steel having a cross-sectional area of 26.67, the model creating unit 11 is stored in association with the identification number “8” from the cross-sectional shape data stored in the H-shaped steel data storage unit 21. FEM analysis model data is created using the obtained data.
In addition, the model creation unit 11 generates FEM analysis model data to be designed using the information on the load conditions for the frame structure input by the operator operating the input unit 2.
The FEM analysis model data created by the model creation unit 11 as described above is output from the model creation unit 11, input to the model data storage unit 12, and stored in the model data storage unit 12.
Note that the FEM analysis model data created in step S1 is model data used as a base when performing an optimization process performed later. For this reason, the cross-sectional area of the member to be used may be an arbitrary value. Therefore, what is necessary is just to select arbitrarily the value of the said cross-sectional shape data used for FEM analysis model data in the range memorize | stored in the member data storage parts 21-26. That is, the FEM analysis model data created in step S1 is created using a value associated with an arbitrary identification number (see FIG. 5) stored in the member data storage units 21 to 26. The sectional shape of each member constituting the structure is provisionally set.

  Next, when an operator instructs execution of the design optimization process via the input unit 2, the buckling length setting unit 14 is created by the model creation unit 11 and stored in the model data storage unit 12. The buckling length is set for the FEM analysis model data, and the FEM analysis model data stored in the model data storage unit 12 is updated. (Step S2). Details of the buckling length setting process will be described later.

  Next, when the setting of the buckling length is completed, the model creation unit 11 instructs the FEM analysis unit 15 to execute the FEM analysis process. In response to this, the FEM analysis unit 15 reads the FEM analysis model data stored in the model data storage unit 12 (step S3). And the FEM analysis part 15 performs FEM analysis, and calculates | requires the stress and deformation amount for every element (step S4). The FEM analysis unit 15 outputs the analysis results (stress and deformation amount for each element) obtained here to the strength evaluation unit 16. In response to this, the strength evaluation unit 16 performs strength evaluation for each member constituting the framework structure (step S5). The strength evaluation is performed by determining whether or not the stress or deformation value for each member exceeds a predetermined threshold value. And the strength evaluation part 16 outputs the FEM analysis result containing whether each member satisfies intensity | strength conditions as an evaluation result. The FEM analysis result is input to the evaluation result storage unit 18 and stored in the evaluation result storage unit 18.

Next, the strength evaluation unit 16 determines whether or not all the evaluated members have passed (satisfying the strength condition) (step S6). As a result of this determination, when all the members have passed (when the strength condition is satisfied), the strength evaluation unit 16 stores the current FEM analysis model data stored in the model data storage unit 12 in another storage area. And the current evaluation result information stored in the evaluation result storage unit 18 are temporarily stored in another storage area (step S7).
The strength evaluation unit 16 then instructs the cross-sectional shape selection unit 17 to lower the identification number of a member that has not been determined to be unacceptable by one rank. Here, the member that has not been determined to be rejected refers to a member whose identification number has not been raised by one rank in step S10 described later (a member that has not been replaced). In response to this, the cross-sectional shape selection unit 17 inquires of the model creation unit 11 about the identification number set at the present time. In response to this, the model creation unit 11 reads the identification number stored in the model data storage unit 12 and replies to the cross-sectional shape selection unit 17.
As can be seen from FIG. 2, in the present embodiment, the execution of the FEM analysis (step S4) may be repeated a plurality of times, but the FEM analysis model data created in step S1 is converted into one FEM analysis (step S4). When step S7 is reached when only S4) is performed, since the process of step S10 is not performed, all the members have not been determined to be rejected. For this reason, in this case, the identification numbers of all members are lowered by one rank in step S8.

The cross-sectional shape selection unit 17 refers to the member data storage units 21 to 26 and identifies an identification number that is one rank lower than the identification number that is answered from the model creation unit 11. Here, lowering one rank means that the identification number is made one smaller value (the cross-sectional area is reduced). For example, if the current identification number is “8”, it is “7”.
The cross-sectional shape selection unit 17 specifies an identification number that is lowered by one rank from the cross-sectional shape data stored in the member data storage unit in which the previously set identification number is stored. That is, when the member to be lowered by one rank is H-shaped steel, the cross-sectional shape selecting unit 17 specifies the identification number that is lowered by one rank from the cross-sectional shape data stored in the H-shaped steel data storage unit 21.

  When specifying the identification number lowered by one rank, the cross-sectional shape selection unit 17 notifies the model generation unit 11 of the specified identification number, and instructs to update the FEM analysis model data. In response to this, the model creation unit 11 updates the FEM analysis model data by replacing a member that has not been determined to be rejected with a member having the notified identification number (step S8). That is, the model creating unit 11 replaces a member that has not been determined to be rejected with a member assigned an identification number one rank lower (that is, a member having a smaller cross-sectional area). Then, when the update of the FEM analysis model data is completed, the model creation unit 11 instructs the FEM analysis unit 15 to execute the FEM analysis process again.

  In response to this, the FEM analysis unit 15 reads the FEM analysis model data stored in the model data storage unit 12 (step S3), executes the FEM analysis, and obtains stress and deformation amount for each element ( In step S4), the strength evaluation unit 16 performs the strength evaluation for each member constituting the frame structure again (step S5). And the strength evaluation part 16 determines whether all the members passed again (step S6). That is, in this embodiment, as long as all the members pass, the processes of steps S3 to S8 are repeated.

On the other hand, when any member does not pass in step S6 (when the strength condition is not satisfied), the strength evaluation unit 16 determines whether all the members have passed in step S6 in the past (step). S9).
If it is not determined in the past that all the members have passed in step S6, the strength evaluating unit 16 raises the identification number of the failed member by one rank with respect to the cross-sectional shape selecting unit 17. Give instructions. In response to this, the cross-sectional shape selection unit 17 inquires of the model creation unit 11 about the identification number set at the current time for the member that has failed. In response to this, the model creation unit 11 reads the identification number stored in the model data storage unit 12 and replies to the cross-sectional shape selection unit 17.

The cross-sectional shape selection unit 17 refers to the member data storage units 21 to 26 and identifies an identification number that is one rank higher than the identification number returned from the model creation unit 11. Here, raising the rank by one means increasing the identification number by one (increasing the cross-sectional area).
The cross-sectional shape selection unit 17 specifies an identification number that is one rank higher than the cross-sectional shape data stored in the member data storage unit in which the previously set identification number is stored. That is, when the member to be increased by one rank is H-shaped steel, the cross-sectional shape selecting unit 17 specifies the identification number that is increased by one rank from the cross-sectional shape data stored in the H-shaped steel data storage unit 21.

  When the cross-sectional shape selection unit 17 specifies an identification number that is one rank higher, the cross-sectional shape selection unit 17 notifies the model generation unit 11 of the specified identification number and instructs to update the FEM analysis model data. In response to this, the model creation unit 11 updates the FEM analysis model data by replacing the member determined to be unacceptable with the member assigned the notified identification number (step S10). That is, the model creation unit 11 replaces a member determined to be unacceptable with a member assigned an identification number one rank higher. That is, the model creating unit 11 replaces a member determined to be unacceptable with a member assigned an identification number one rank higher (that is, a member having a larger cross-sectional area). Then, when the update of the FEM analysis model data is completed, the model creation unit 11 instructs the FEM analysis unit 15 to execute the FEM analysis process again.

  In response to this, the FEM analysis unit 15 reads the FEM analysis model data stored in the model data storage unit 12 (step S3), executes the FEM analysis, and obtains stress and deformation amount for each element ( In step S4), the strength evaluation unit 16 performs the strength evaluation for each member constituting the frame structure again (step S5). That is, in this embodiment, unless all the members are determined to pass in step S6, the processes in steps S3 to S6, S9, and S10 are repeated.

And as a result of raising the identification number of the rejected member by one rank, if all the members pass, the strength evaluation unit 16 stores the current model data stored in the model data storage unit 12 in another storage area. While temporarily storing, the present evaluation result information stored in the evaluation result storage unit 18 is temporarily stored in another storage area (step S7). The strength evaluation unit 16 then instructs the cross-sectional shape selection unit 17 to lower the identification number of a member that has not been determined to be unacceptable by one rank. Then, the strength evaluation unit 16 performs strength evaluation while lowering the cross-sectional shape of the member that has not been determined to be rejected by one rank, and repeats the processing of steps S3 to S8 until the determination result of step S6 becomes No.
Then, when any member does not pass, the strength evaluation unit 16 determines whether all the members have passed in the past (step S9). In this example, since all the members have passed in the past, the strength evaluation unit 16 has the model data temporarily stored in the model data storage unit 12 and the evaluation temporarily stored in the evaluation result storage unit 18. The result information is returned to the original storage area (step S11). Then, the FEM analysis model data stored in the model data storage unit 12 and the evaluation result information stored in the evaluation result storage unit 18 are displayed on the display unit 3 as design book information. The design book information may be output to a printing apparatus (not shown) to create a printed matter of the design book information.

  Next, the operation of the buckling length setting process (step S2) shown in FIG. 2 will be described with reference to FIG. FIG. 3 is a flowchart showing a detailed operation of the buckling length setting unit 14 shown in FIG. First, the buckling length setting unit 14 instructs the grouping processing unit 13 to execute a grouping process for members defined in the model data. As shown in FIG. 7, the model data for FEM analysis of the frame structure needs to define nodes (circles shown in FIG. 7) at positions where members are connected. It is common to divide and define the component elements. That is, on the model data, even if one member is used in an actual structure, it is defined by a plurality of members.

For example, in FIG. 7, a beam using one H-shaped steel denoted by reference numeral H1 must define five nodes (S1, S2, S3, S4, and S5). Therefore, the beam H1 includes a node S1, There are four elements: an element having S2 at both ends, an element having nodes S2 and S3 at both ends, an element having nodes S3 and S4 at both ends, and an element having nodes S4 and S5 at both ends. However, since one H-shaped steel is used in the actual structure, the grouping process is performed so that four elements are regarded as one member and can be analyzed. The grouping processing unit 13 searches the model data created by the model creating unit 11 for a member in which a plurality of members joined at nodes form one straight line, and a plurality of members forming one straight line. A grouping process is executed so that the members are regarded as one member (step S21).
The detailed operation of this grouping process will be described later. The grouping processing unit 13 outputs group list information that defines grouped elements (members) to the buckling length setting unit 14.

  Next, the buckling length setting unit 14 performs the processes of steps S22 to S31 for each of the grouped members (members regarded as one member) defined in the group list. The buckling length setting unit 14 determines whether the I-th group on the group list is a column or a beam (step S23). This determination is made depending on whether it is vertical or horizontal. If the result of this determination is that it is neither a column nor a beam, the process moves to the next group.

  On the other hand, when it is a column or a beam, the buckling length setting unit 14 determines the local coordinate system of the grouped members (step S24). The local coordinate system determines an orthogonal coordinate system in which the longitudinal direction of the member is the X axis, and the Z axis of the local coordinate system is closer to the Y axis of the global coordinate system (model data coordinate system). And the buckling length setting part 14 performs the process of step S25-S28 with respect to each member which comprises an Ith grouping member. The buckling length setting unit 14 checks whether or not there is a member connected from the Y-axis direction of the local coordinate system for each member (member sandwiched between nodes). The member length is set as a candidate for the buckling length in the Y-axis direction (step S26). In addition, the buckling length setting unit 14 checks whether there is a member connected from the Z-axis direction of the local coordinate system with respect to each member (member sandwiched between nodes). The member length is set as a candidate for the buckling length in the Z-axis direction (step S27).

  Next, the buckling length setting unit 14 sets the longest buckling length (member length) among the plurality of candidates for the buckling length in the Y-axis direction as the buckling length in the Y-axis direction (step) S29). The buckling length setting unit 14 sets the longest buckling length (member length) among the plurality of candidates for the buckling length in the Z-axis direction as the buckling length in the Z-axis direction (step S30). ). By performing this process on all the grouping members, the buckling lengths in the Y-axis direction and the Z-axis direction are obtained for the grouping member (actually one member), and the calculated seating is obtained. The value of the bending length is output to the model creation unit 11. The model creation unit 11 defines the buckling length value output from the buckling length setting unit 14 in the model data and stores it in the model data storage unit 12.

  Here, the processing operation shown in FIG. 3 will be described with reference to FIG. In FIG. 6, when the beam denoted by reference numeral H1 is the I-th grouping member, the buckling length setting unit 14 sets the longitudinal direction of the beam H1 as the X axis of the local coordinate system and the Y axis of the global coordinate system. An orthogonal coordinate system in which the near direction is the Z axis of the local coordinate system is defined. When the connection state of the members extending from the Y-axis direction is checked with respect to the beam H1, the members are connected at two locations with respect to the beam H1, so that the buckling length candidates a and b in the Y-axis direction are determined. , C can be obtained. Further, when the connection state of the members extending from the Z-axis direction is checked with respect to the beam H1, the members are connected to the beam H1 at one location, so that the buckling length candidates d and e in the Z-axis direction are determined. Can be requested. Since the longest candidate among the buckling length candidates a, b, and c in the Y-axis direction is b, the buckling length in the Y-axis direction is set to 3500 mm. Moreover, since the longest candidate is d among the buckling length candidates d and e in the Z-axis direction, the buckling length in the Z-axis direction is set to 4600 mm. By executing such processing, the operator can automatically set the buckling length without setting it one by one.

  Next, with reference to FIG. 4, the process which groups the finite element for defining the member which comprises the frame structure required in order to set buckling length is demonstrated. FIG. 4 is a flowchart showing a detailed operation of the grouping processing unit 13 shown in FIG. First, the grouping processing unit 13 reads the model data stored in the model data storage unit 12 via the model creation unit 11. Then, referring to the model data, a member that is in a straight line is searched (step S41). Then, the grouping processing unit 13 determines whether there is baseline data (step S42). The baseline data is coordinate data of a reference line along the axis on which the strength member is disposed.

  If there is baseline data as a result of this determination, the grouping processing unit 13 performs the processes in steps S43 to S48 on the straight member searched. The grouping processing unit 13 determines whether or not the member is a small beam (step S44). If the member is not a small beam, the group of straight lines is cut on the base line (step S45). An intersection point is obtained, and a straight line group is cut at the position (step S46). Then, the cut straight line group is added to the group list (step S47).

  On the other hand, when there is no baseline data, the grouping process part 13 performs the process of step S49-S52 with respect to the straight member searched. The grouping processing unit 13 obtains an intersection with another straight line, and cuts the straight line group at the position (step S50). Then, the cut straight line group is added to the group list (step S51). By this processing, it is possible to group finite elements for defining members constituting the frame structure necessary for setting the buckling length.

  As explained above, based on the assumed initial cross-sectional shape, the structural analysis is automatically repeated until all the members pass, so that it is possible to greatly reduce the effort required for the structural design and the quality is high. Structural design can be done. That is, in this embodiment, it is determined whether or not the strength of each member obtained by the FED analysis satisfies the strength condition, and the strength condition is satisfied until the strength of each member obtained by the analysis FED analysis satisfies the strength condition. Since the member that does not satisfy the above is replaced with a member having a larger cross-sectional area selected from the cross-sectional shape data, it is possible to greatly reduce the labor required for the structural design and to perform a high-quality structural design.

Further, since the cross-sectional shape of the passed member is automatically reduced as much as possible, the weight of the structure can be minimized, and a more optimized design can be performed.
That is, in this embodiment, when the strength obtained by the FED analysis in all the members satisfies the strength condition, the member that has not been replaced is replaced with a member having a smaller sectional area selected from the sectional shape data. As a result, the weight of the structure can be minimized, and a more optimized design can be performed.

  In addition, since the buckling length can be automatically set based on the layout of the frame structure, the strength of the members that make up the frame structure for accurate and efficient optimization design can be evaluated appropriately. It becomes possible to do.

Note that the framework structure design program in the present embodiment is recorded in a portable medium (flexible disk, magneto-optical disk, ROM, CD-ROM, etc.) that can be read by a computer device, for example, a storage device, an arithmetic device, etc. Is stored in the framework structure design system 1 of the present embodiment configured by a computer.
Then, the frame structure design program causes the frame structure design system 1 to perform the optimization design of the structure by operating the frame structure design system 1 as described above.
Such a framework structure design program is not limited to a portable medium, but may be recorded on a recording medium such as a hard disk or a memory. The program is recorded on the portable medium, the recording medium, or via a communication line. It can be distributed.

(Second Embodiment)
Next, as a second embodiment of the present invention, a plate structure design system, a plate structure design method, and a plate structure design program as an embodiment of the structure design system, structure design method and structure design program of the present invention explain.
In the description of the present embodiment, the description of the same parts as those of the first embodiment is omitted or simplified.

FIG. 8 is a block diagram showing the configuration of the plate structure design system of this embodiment. In this figure, reference numeral 4 denotes a plate structure design system that performs optimization design of a plate structure based on the result of FEM (Finite Element Method) analysis, and includes a computer device.
This plate bone structure design system 4 performs optimization design of the plate bone structure based on the result of the strength evaluation of the structure using the analysis model data of the structure having the plate bone structure (plate bone structure). Do.

FIG. 9 is a perspective view showing a plate bone constituting the plate bone structure. FIG. 10 is a cross-sectional view of a plate bone constituting the plate bone structure. As shown in these drawings, the plate bone X is a plate member having a predetermined thickness t. On one side of the plate bone X, a rib Y (reinforcing member) for reinforcing the plate bone X is stretched.
And a plate-bone structure is comprised by joining several plate-bones by welding. For example, the hull or the like is a plate bone structure.

Returning to FIG. 8, reference numeral 41 denotes a model creation unit that creates model data for FEM analysis based on information input from the input unit 2.
Further, the model creation unit 41 functions as a cross-sectional shape assumption unit of the present invention. For example, for each analysis model data of the plate bone structure created in advance (in advance), each member constituting the plate bone structure Temporarily set or reset the cross-sectional shape.

Reference numeral 42 denotes a model data storage unit that stores model data for FEM analysis created in the model creation unit 41.
Reference numeral 43 denotes a search for a member in which a plurality of joined members form one straight line from the model data created in the model creating unit 41, and a plurality of members forming one straight line are A grouping processing unit that groups a set of members to be regarded as members.
Reference numeral 44 denotes a buckling length setting unit that sets a buckling length of a member to be regarded as one member grouped in the grouping processing unit 43.

A reference numeral 45 reads the FEM analysis model data stored in the model data storage unit 42, executes FEM (Finite Element Method) analysis using the FEM analysis model data, The FEM analysis part (analysis execution means) which calculates the intensity of each member which constitutes.
It should be noted that the strength of each member constituting the plate frame structure is a value that is uniquely determined by the stress and the deformation amount in each element constituting the FEM analysis model data. For this reason, in this embodiment, the FEM analysis part 45 calculated | required the intensity | strength of each member (plate bone and rib) which comprises a plate-bone structure by performing FEM analysis and calculating | requiring the stress and deformation amount in each element. I will do it.
The model creation unit 41 and the FEM analysis unit 45 store known FEM model generation software, FEM analysis software, and the like, and perform model creation and FEM analysis using the software.

Reference numeral 46 denotes a strength evaluation unit that performs a strength evaluation determination based on the stress and deformation amount of each element obtained by the FEM analysis unit 45 (that is, the strength of each member).
Reference numeral 47 is used for a member (structure) defined in JIS (Japanese Industrial Standards) in order to change the cross-sectional shape of the member constituting the plate bone structure in accordance with the evaluation result of the strength evaluation unit 46. It is a cross-sectional shape selection part which selects the cross-sectional shape containing the cross-sectional area of a possible member).
Reference numeral 48 denotes an evaluation result storage unit that stores information on strength evaluation in the strength evaluation unit 46.

Reference numerals 51 and 52 are member data storage units in which cross-sectional shape data of members used in the plate frame structure defined by JIS are stored in advance. In the member data storage units 51 and 52, two types of cross-sectional shape data of the plate bone X and the rib Y are stored in advance.
The plate bone data storage unit 51 stores cross-sectional shape data in which a plurality of plate bones having different areas and the cross-sectional areas of the plate bones are associated with each other. The plate data storage unit 51 stores a plurality of plate bones having different areas by assigning sequential identification numbers so that the cross-sectional areas are in ascending order.
The vertical and horizontal widths of the plate bone are determined by the structure of the plate bone structure. For this reason, the cross-sectional shape of the plate bone can be defined by the plate thickness t. And in the plate bone data storage part 51, the said plate | board thickness t is linked | related with the plate bone (identification number), and is memorize | stored as a part of cross-sectional shape data.
The rib data storage unit 52 stores cross-sectional shape data in which a plurality of ribs having different areas and cross-sectional areas of the ribs are associated with each other. The rib data storage unit 52 stores a plurality of plate bones having different areas by assigning sequential identification numbers so that the cross-sectional areas are in ascending order. The rib data storage unit 52 stores dimensions for defining the cross-sectional shape of the rib as a part of the cross-sectional shape data in association with the rib.
Further, the plate bone data storage unit 51 and the rib data storage unit 52 are associated with each identification number, the value of the cross-sectional secondary moment of each of the Z axis and Y axis, the value of the torsional moment, each of the Z axis and Y axis. The value of the shear area is stored as a part of the cross-sectional shape data.

  In the plate structure design system 4 of this embodiment as described above, the model creation unit 11, the model data storage unit 12, the strength evaluation unit 16, the cross-sectional shape selection unit 17, and the evaluation result storage unit 18 obtain the values by FED analysis. It is determined whether or not the strength of each member satisfies the strength condition, and the member that does not satisfy the strength condition is selected from the cross-sectional shape data until the strength of each member obtained by the analysis FED analysis satisfies the strength condition. Replace with a member with a large cross-sectional area. That is, in the plate structure design system 4 of the present embodiment, the model creation unit 11, the model data storage unit 12, the strength evaluation unit 16, the cross-sectional shape selection unit 17, and the evaluation result storage unit 18 serve as optimization means in the present invention. It is composed.

Next, the operation (structure design method) of the plate structure design system 4 shown in FIG. 8 will be described. The following description of the operation of the plate structure design system 4 will be made with reference to the flowchart of FIG.
First, the model creation unit 41 creates FEM analysis model data of a structure having a plate bone structure based on information input by the operator operating the input unit 2 (step S61). Note that the FEM analysis model data also includes information for specifying the type and cross-sectional area of the members used for the plate bone structure, and for example, the distance between the sections delimited by the rib Y as shown in FIG. L4, W1 to W6 are included. The cross-sectional area of the member to be used is read by selecting and reading the cross-sectional shape data stored in the member data storage units 51 and 52 by the model creation unit 41 based on information input by the operator via the input unit 1. Set by
In addition, the model creation unit 41 generates FEM analysis model data to be designed using information on the load conditions for the plate structure that is input by the operator operating the input unit 2.
The FEM analysis model data created by the model creation unit 41 as described above is output from the model creation unit 41, input to the model data storage unit 42, and stored in the model data storage unit 42.
Note that the FEM analysis model data created in step S61 is model data used as a base when performing an optimization process performed later. For this reason, the cross-sectional area of the member to be used may be an arbitrary value. Therefore, what is necessary is just to select arbitrarily the value of the said cross-sectional shape data used for FEM analysis model data in the range memorize | stored in the member data storage parts 51 and 52. FIG. That is, the FEM analysis model data created in step S61 is created using a value associated with an arbitrary identification number stored in the member data storage units 51 and 52, and constitutes a plate bone structure. The sectional shape of each member is temporarily set.

  Next, when the operator instructs execution of the design optimization process via the input unit 2, the buckling length setting unit 44 is created by the model creation unit 41 and stored in the model data storage unit 42. The buckling length is set for the FEM analysis model data, and the FEM analysis model data stored in the model data storage unit 42 is updated. (Step S62).

  Next, when the setting of the buckling length is completed, the model creation unit 41 instructs the FEM analysis unit 45 to execute the FEM analysis process. In response to this, the FEM analysis unit 45 reads the FEM analysis model data stored in the model data storage unit 42 (step S63). Then, the FEM analysis unit 45 performs FEM analysis to obtain stress and deformation amount for each element (step S4). The FEM analysis unit 45 outputs the analysis results (stress and deformation amount for each element) obtained here to the strength evaluation unit 46. In response, the strength evaluation unit 46 performs strength evaluation for each member constituting the plate bone structure (step S65). The strength evaluation is performed by determining whether or not the stress or deformation value for each member exceeds a predetermined threshold value. And the strength evaluation part 46 outputs the FEM analysis result containing whether each member satisfies intensity | strength conditions as an evaluation result. The FEM analysis result is input to the evaluation result storage unit 48 and stored in the evaluation result storage unit 48.

Next, the strength evaluation unit 46 determines whether or not all the evaluated members pass (satisfy the strength condition) (step S66). As a result of this determination, when all the members pass (when the strength condition is satisfied), the strength evaluation unit 46 stores the current FEM analysis model data stored in the model data storage unit 42 in another storage area. And the current evaluation result information stored in the evaluation result storage unit 48 are temporarily stored in another storage area (step S67).
The strength evaluating unit 46 then instructs the cross-sectional shape selecting unit 47 to lower the identification number of a member that has not been determined to be unacceptable by one rank. Here, the member that has not been determined to be rejected refers to a member whose identification number has not been raised by one rank in step S70 described later (a member that has not been replaced). In response to this, the cross-sectional shape selection unit 47 inquires of the model creation unit 41 about the identification number set at the present time. In response to this, the model creation unit 41 reads the identification number stored in the model data storage unit 42 and replies to the cross-sectional shape selection unit 47.
As can be seen from FIG. 11, in the present embodiment, the execution of the FEM analysis (step S64) may be repeated a plurality of times, but the FEM analysis model data created in step S1 is converted into one FEM analysis (step S64). When step S67 is reached when only S64) is performed, since the process of step S70 has not been performed, all the members have not been determined to be rejected. For this reason, in this case, the identification numbers of all members are lowered by one rank in step S68.

The cross-sectional shape selection unit 47 refers to the member data storage units 51 and 52, and specifies an identification number that is one rank lower than the identification number returned from the model creation unit 41. Here, lowering one rank means that the identification number is made one smaller value (the cross-sectional area is reduced). For example, if the current identification number is “8”, it is “7”.
The cross-sectional shape selection unit 47 specifies an identification number that is lowered by one rank from the cross-sectional shape data stored in the member data storage unit in which the previously set identification number is stored. That is, when the member to be lowered by one rank is a plate bone, the cross-sectional shape selection unit 47 specifies the identification number lowered by one rank from the cross-sectional shape data stored in the plate bone data storage unit 51.

When specifying the identification number lowered by one rank, the cross-sectional shape selection unit 47 notifies the model generation unit 41 of the specified identification number and instructs to update the FEM analysis model data. In response to this, the model creation unit 11 updates the FEM analysis model data by replacing a member that has not been determined to be rejected with a member having the notified identification number (step S68). That is, the model creating unit 11 replaces a member that has not been determined to be rejected with a member assigned an identification number one rank lower (that is, a member having a smaller cross-sectional area).
Thus, when a member that has not been determined to be unacceptable in step S68 is replaced with a member assigned an identification number one rank below, the thickness of the plate bone decreases or the cross-sectional area of the rib decreases. Thus, the positional relationship between the plate bone and the rib in the FEM analysis model data changes due to separation or the like. For this reason, in this embodiment, the model creation part 41 correct | amends the positional relationship of a plate bone and a rib (step S80). Note that the positions of the center of gravity of the plate bone and the rib are fixed even when the cross-sectional area is reduced. For this reason, the model creation unit 41 detects the barycentric position of the plate bone and the rib, and corrects the positional relationship between the plate bone and the rib by moving the barycentric position so that the rib contacts one surface of the plate bone. .
In step S64, the effective width of the plate bone to which the rib is joined is used to analyze the cross-sectional performance of the rib. This effective width changes when a member that has not been determined to be unacceptable in step S68 is replaced with a member assigned an identification number one rank below. Therefore, in the present embodiment, the model creation unit 41 recalculates (corrects) the effective width (step S81).
When the update of the FEM analysis model data is completed in this manner, the model creation unit 41 instructs the FEM analysis unit 45 to execute the FEM analysis process again.

  In response to this, the FEM analysis unit 45 reads the FEM analysis model data stored in the model data storage unit 42 (step S63), executes the FEM analysis, and obtains the stress and deformation amount for each element ( In step S64), the strength evaluation unit 46 performs strength evaluation for each member constituting the plate bone structure again (step S65). And the strength evaluation part 46 determines whether all the members passed again (step S66). That is, in this embodiment, as long as all the members pass, the processes of steps S63 to S68, S80, and S81 are repeated.

On the other hand, when any member does not pass in step S66 (when the strength condition is not satisfied), the strength evaluating unit 46 determines whether all the members have passed in step S66 in the past (step). S69).
If it is not determined in the past that all the members have passed in step S66, the strength evaluation unit 46 raises the identification number of the failed member by one rank with respect to the cross-sectional shape selection unit 47. Give instructions. In response to this, the cross-sectional shape selection unit 47 inquires of the model creation unit 41 about the identification number set at the current time for the member that has failed. In response to this, the model creation unit 41 reads the identification number stored in the model data storage unit 42 and replies to the cross-sectional shape selection unit 47.

The cross-sectional shape selection unit 47 refers to the member data storage units 51 and 52 and identifies an identification number that is one rank higher than the identification number that is answered from the model creation unit 41. Here, raising the rank by one means increasing the identification number by one (increasing the cross-sectional area).
Note that the cross-sectional shape selection unit 47 specifies an identification number that is one rank higher than the cross-sectional shape data stored in the member data storage unit in which the previously set identification number is stored. That is, when the member to be upgraded by one rank is a plate bone, the cross-sectional shape selection unit 47 specifies an identification number that is raised by one rank from the cross-sectional shape data stored in the plate bone data storage unit 51.

When the cross-sectional shape selection unit 47 specifies an identification number that is one rank higher, the cross-sectional shape selection unit 47 notifies the model creation unit 41 of the specified identification number and instructs to update FEM analysis model data. In response to this, the model creation unit 41 updates the FEM analysis model data by replacing the member determined to be unacceptable with the member having the notified identification number (step S70). That is, the model creation unit 41 replaces a member determined to be unacceptable with a member assigned an identification number one rank higher (that is, a member having a larger cross-sectional area).
Thus, when the member determined to be unacceptable in step S70 is replaced with a member having an identification number one rank higher, the thickness of the plate bone increases or the cross-sectional area of the rib increases, and the FEM The positional relationship between the plate bone and the rib in the analysis model data changes. Therefore, in the present embodiment, the model creation unit 41 corrects the positional relationship between the plate bones and the ribs as in step S80 (step S82). Further, the model creation unit 41 recalculates (corrects) the effective width in the same manner as in step S81 (step S83).
When the update of the FEM analysis model data is completed, the model creation unit 41 instructs the FEM analysis unit 45 to execute the FEM analysis process again.

  In response to this, the FEM analysis unit 45 reads the FEM analysis model data stored in the model data storage unit 42 (step S63), executes the FEM analysis, and obtains the stress and deformation amount for each element ( In step S64), the strength evaluation unit 46 performs strength evaluation for each member constituting the plate bone structure again (step S65). That is, in this embodiment, unless all the members are determined to pass in step S66, the processes in steps S63 to S66, S69, S70, S82, and S83 are repeated.

And as a result of raising the identification number of the rejected member by one rank, when all the members pass, the strength evaluation unit 46 stores the current model data stored in the model data storage unit 42 in another storage area. While temporarily storing, the present evaluation result information stored in the evaluation result storage unit 48 is temporarily stored in another storage area (step S67). The strength evaluating unit 46 then instructs the cross-sectional shape selecting unit 47 to lower the identification number of a member that has not been determined to be unacceptable by one rank. Then, strength evaluation is performed by the strength evaluation unit 46 while lowering the cross-sectional shape of the member that has not been determined to be rejected by one rank, and steps S63 to S68, S80, and S81 are performed until the determination result of step S6 becomes No. Repeat the process.
Then, when any member does not pass, the strength evaluation unit 46 determines whether all the members have passed in the past (step S69). In this example, since all the members have passed in the past, the strength evaluation unit 46 evaluates the model data temporarily stored in the model data storage unit 42 and the evaluation data temporarily stored in the evaluation result storage unit 48. The result information is returned to the original storage area (step S71). Then, the FEM analysis model data stored in the model data storage unit 42 and the evaluation result information stored in the evaluation result storage unit 48 are displayed on the display unit 3 as design book information. The design book information may be output to a printing apparatus (not shown) to create a printed matter of the design book information.

  As explained above, based on the assumed initial cross-sectional shape, the structural analysis is automatically repeated until all the members pass, so that it is possible to greatly reduce the effort required for the structural design and the quality is high. Structural design can be done. That is, in this embodiment, it is determined whether or not the strength of each member obtained by the FED analysis satisfies the strength condition, and the strength condition is satisfied until the strength of each member obtained by the analysis FED analysis satisfies the strength condition. Since the member that does not satisfy the above is replaced with a member having a larger cross-sectional area selected from the cross-sectional shape data, it is possible to greatly reduce the labor required for the structural design and to perform a high-quality structural design.

Further, since the cross-sectional shape of the passed member is automatically reduced as much as possible, the weight of the structure can be minimized, and a more optimized design can be performed.
That is, in this embodiment, when the strength obtained by the FED analysis in all the members satisfies the strength condition, the member that has not been replaced is replaced with a member having a smaller sectional area selected from the sectional shape data. As a result, the weight of the structure can be minimized, and a more optimized design can be performed.

The plate structure design program according to the present embodiment is recorded in a portable medium (flexible disk, magneto-optical disk, ROM, CD-ROM, etc.) that can be read by a computer device, for example, and is a storage device or arithmetic device. Are stored in the plate structure design system 4 of the present embodiment, which is configured by a computer including the above.
Then, the plate frame structure design program causes the plate frame structure design system 4 to perform the optimization design of the structure by operating the plate frame structure design system 4 as described above.
Such a plate structure design program is not limited to a portable medium, and may be recorded on a recording medium such as a hard disk or a memory. The program is recorded on the portable medium, the recording medium, or via a communication line. Can be distributed.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

For example, in the above embodiment, the structure design system, the structure design method, and the structure design program for performing the optimization design of the structure of the present invention have been described for the structure applied to the design work of the frame structure or the plate frame structure. .
However, the present invention is not limited to this, and can be applied to a design work of a structure having both a frame structure and a plate frame structure.

Moreover, in the said embodiment, the structure which evaluates the intensity | strength of a structure by performing FEM analysis was demonstrated.
However, the present invention is not limited to this, and can also be applied to the case where the strength of a structure is evaluated by numerical analysis using a boundary element method or a difference method. In this case, analysis model data suitable for the numerical analysis to be used is created by the model creation unit.

  DESCRIPTION OF SYMBOLS 1 ... Frame structure design system, 2 ... Input part, 3 ... Display part, 4 ... Plate structure design system, 11, 41 ... Model creation part, 12, 42 ... Model data Storage unit 13, 43 ... Grouping processing unit, 14, 44 ... Buckling length setting unit, 15, 45 ... FEM analysis unit, 16, 46 ... Strength evaluation unit, 17, 47. ... Sectional shape selection unit, 21... H-shaped steel data storage unit, 22... I-type steel data storage unit, 23... Square steel pipe data storage unit, 24.・ Round steel pipe data storage unit, 26... L-shaped steel data storage unit, 51... Steel plate data storage unit, 52.

Claims (15)

A structural design system that performs optimization design of a structure based on a result of strength evaluation of the structure using analysis model data of a structure having at least one of a frame structure and a plate frame structure. ,
A member data storage means in which cross-sectional shape data in which a member that can be used in the structure and a cross-sectional area of the member are associated with each other is stored in advance;
Cross-sectional shape assumption means for temporarily setting the cross-sectional shape of each member constituting the structure with respect to the analysis model data of the structure created in advance,
Reading the analysis model data in which the cross-sectional shape is set, performing analysis using the analysis model data, and analyzing execution means for obtaining the strength of each member;
It was determined whether or not the strength of each member obtained by the analysis execution unit satisfies a strength condition, and the strength condition was not satisfied until the strength of each member obtained by the analysis execution unit satisfies the strength condition. An optimization means for replacing the member with a member having a larger sectional area selected from the sectional shape data.   The optimization unit replaces a member that has not been replaced with a member having a smaller cross-sectional area selected from the cross-sectional shape data when the strength required by the analysis execution unit of all the members satisfies the strength condition. The structural design system according to claim 1. When there are multiple types of members that can be used for the structure,
The member data storage means for storing cross-sectional shape data in which cross-sectional areas of the member and the member are related for each type of the member,
The structural design system according to claim 1, wherein the optimization unit replaces the member with the same type of member when replacing the member. When the structure includes a plate member and a reinforcing member that reinforces the plate member,
The said optimization means correct | amends the positional relationship with the said plate member and the said reinforcement member, when at least any one of the said plate member and the said reinforcement member is replaced. Structural design system. When the structure includes a plate member and a reinforcing member that reinforces the plate member,
The optimization unit corrects an effective width used for calculating the strength of the reinforcing member by the analysis executing unit when at least one of the plate member and the reinforcing member is replaced. The structural design system according to claim 1. A structural design method for performing optimization design of a structure based on a result of strength evaluation of the structure using analysis model data of a structure having at least one of a frame structure and a plate frame structure. ,
A cross-sectional shape assumption step for temporarily setting a cross-sectional shape of each member constituting the structure with respect to the analysis model data of the structure created in advance,
Reading the analysis model data in which the cross-sectional shape is set, performing analysis using the analysis model data, and performing an analysis step of obtaining the strength of each member;
It was determined whether or not the strength of each member obtained by the analysis execution step satisfies the strength condition, and the strength condition was not satisfied until the strength of each member obtained by the analysis execution step satisfied the strength condition. An optimization step of replacing the member with a member having a larger cross-sectional area selected from cross-sectional shape data in which the member usable in the structure and the cross-sectional area of the member are related to each other. Structural design method to do.   In the optimization step, when the strength obtained by the analysis execution step for all the members satisfies the strength condition, the member that has not been replaced is replaced with a member having a smaller sectional area selected from the sectional shape data. The structural design method according to claim 6. When there are multiple types of members that can be used for the structure,
In the optimization step, when the member is replaced, the member is replaced with the same type of member based on cross-sectional shape data in which cross-sectional areas of the member and the member are related for each type of the member. The structural design method according to claim 6 or 7, wherein: When the structure includes a plate member and a reinforcing member that reinforces the plate member,
9. The positional relationship between the plate member and the reinforcing member is corrected when at least one of the plate member and the reinforcing member is replaced in the optimization step. Structural design method. When the structure includes a plate member and a reinforcing member that reinforces the plate member,
In the optimization step, when at least one of the plate member and the reinforcing member is replaced, the effective width used for calculating the strength of the reinforcing member in the analysis execution step is corrected. The structural design method according to any one of claims 6 to 9. Structural design that causes a computer to perform optimization design of a structure based on the result of strength evaluation of the structure using analysis model data of a structure having at least one of a frame structure and a plate frame structure A program,
A cross-sectional shape assumption step for temporarily setting a cross-sectional shape of each member constituting the structure with respect to the analysis model data of the structure created in advance,
Reading the analysis model data in which the cross-sectional shape is set, performing analysis using the analysis model data, and performing an analysis step of obtaining the strength of each member;
It was determined whether or not the strength of each member obtained by the analysis execution step satisfies the strength condition, and the strength condition was not satisfied until the strength of each member obtained by the analysis execution step satisfied the strength condition. And causing the computer to execute an optimization step of replacing the member with a member having a larger cross-sectional area selected from cross-sectional shape data in which the member usable in the structure and the cross-sectional area of the member are related to each other. A structural design program characterized by that.   In the optimization step, when the strength obtained by the analysis execution step for all the members satisfies the strength condition, the member that has not been replaced is replaced with a member having a smaller sectional area selected from the sectional shape data. The structural design program according to claim 11, wherein: When there are multiple types of members that can be used for the structure,
In the optimization step, when the member is replaced, the member is replaced with the same type of member based on cross-sectional shape data in which the cross-sectional areas of the member and the member are related for each type of the member. 13. The structural design program according to claim 11 or 12, characterized in that: When the structure includes a plate member and a reinforcing member that reinforces the plate member,
The positional relationship between the plate member and the reinforcing member is corrected when at least one of the plate member and the reinforcing member is replaced in the optimization step. Structural design program. When the structure includes a plate member and a reinforcing member that reinforces the plate member,
In the optimization step, when at least one of the plate member and the reinforcing member is replaced, the effective width used for calculating the strength of the reinforcing member in the analysis executing step is corrected. The structural design program according to claim 11.

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