CN108846197B - Bridge girder erection machine girder damage identification and damage degree quantitative analysis method - Google Patents
Bridge girder erection machine girder damage identification and damage degree quantitative analysis method Download PDFInfo
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Abstract
The invention relates to a method for identifying damage and quantitatively analyzing damage degree of a main beam of a bridge girder erection machine, which is characterized in that a main beam structure type judging module MI, a damage identification and analysis module MII and a damage quantitative analysis module MIII are established based on the current situation that a main beam support changes at any time in the operation process of the bridge girder erection machine. The damage identification and analysis module comprises: the method comprises the steps of installing a deflection test system; secondly, flexibility detection data are collected and processed to obtain a flexibility influence line f1(x) (ii) a Fourthly, the deflection influence line is processed to obtain a deflection rate curve f1"(x); fifthly, judging whether mutation occurs; sixthly, judging the damage position and the damage quantity. The damage quantitative analysis module comprises: firstly, establishing a numerical value simulation model; the method comprises the following steps of constructing n damage working conditions, constructing m damage degrees for each damage working condition, obtaining the flexibility values of different damage degrees, and defining a relation curve of flexibility and damage degree; and obtaining a relation between the deflection rate and the damage degree of the main beam of the bridge girder. The invention solves the problems that the structural damage of the main beam of the bridge girder erection machine cannot be found in time and serious safety accidents are easy to cause.
Description
Technical Field
The invention belongs to the technical field of mechanical structure damage identification and analysis, and relates to a bridge girder damage identification and damage degree quantitative analysis method.
Background
The bridge girder erection machine is widely applied to bridge erection construction in high-speed rail construction, the operation environment is severe, frequent transition operation is carried out, damage phenomena such as welding line corrosion and plate cracking occur frequently, and major safety accidents are easily caused. In recent years, the safety accidents of the bridge girder erection machine frequently occur, and serious casualties and property loss are caused. In order to discover potential safety hazards of the bridge girder erection machine as soon as possible, people pay more and more attention to the problem of identifying structural damage of the bridge girder erection machine.
Structural damage identification has been a hotspot of researchers. The scholars at home and abroad develop researches on various identification methods based on frequency, vibration mode, strain mode, flexibility and the like aiming at different research objects, but the existing structural damage identification method only stays at a simple model or numerical simulation stage in a laboratory at present, and the existing damage identification method has the following limiting factors when applied to bridge girder erection machine damage identification: (1) pre-structural damage modalities and physical parameters. Most of the existing damage identification methods need the modal and physical parameters of the bridge girder erection machine before damage, the bridge girder erection machine in service is subjected to transition and transformation for many times, and the modal and physical parameters of the bridge girder erection machine can be influenced by repeated disassembly, assembly and transformation, so that the modal and physical parameters of the bridge girder erection machine before damage are difficult to obtain. (2) Environmental factors of a construction site of the bridge girder erection machine are not considered. The bridge girder erection machine construction site environment is complex, a generator is needed to generate power to provide power during bridge girder erection machine construction operation, the generator can generate huge noise pollution, meanwhile, constructors walk back and forth on the bridge girder erection machine and need to utilize interphones to communicate with each other to conduct construction, and the factors can influence the accuracy of site actual measurement structure modal parameters. (3) The working condition of the bridge girder erection machine on site is not combined. The bridge girder erection machine has complex working conditions, such as uneven support legs of the bridge girder erection machine, or due to the requirement of site construction, a certain component between the support legs of the bridge girder erection machine and the main girder is locked, so that the connection mode of the support legs and the main girder is changed from hinging to fixed connection, and the working conditions can have great influence on modal parameters of a site actual measurement structure. (4) When the damage identification method is actually applied, the damage identification effect is unknown.
In order to ensure the safety of the bridge girder erection machine in the construction process, the national regulations require that the bridge girder erection machine is periodically detected, whether damage to the bridge girder erection machine can be found as soon as possible in the detection is crucial to the later construction safety, although the current damage identification method has a good identification effect, the current damage identification method is limited to numerical simulation and simple model test research and is not expanded into practical application, and the damage identification of the bridge girder erection machine is more important to the practical application effect. The method for identifying the damage based on the deflection influence line is a hotspot of research in recent years, is simple to operate and has good practical application value, but the current research of the method is not in accordance with the current situation that the hole-by-hole moving operation of a bridge girder erection machine and the real-time change of the supporting condition are carried out on the premise that the fixing of each supporting position of the structure is not changed.
The method for identifying the main beam damage and quantitatively analyzing the damage degree of the bridge girder erection machine has important practical significance by establishing a method which combines the working condition of the bridge girder erection machine and aims at the characteristics of hole-by-hole girder erection operation of the bridge girder erection machine and random change of the supporting state of the main beam at any time.
Disclosure of Invention
The invention aims to provide a method for identifying the damage of a main beam of a bridge girder erection machine and quantitatively analyzing the damage degree, which overcomes the defects that the damage identification technology in the prior art needs the mode and physical parameters of the main beam of the bridge girder erection machine before damage, so as to adapt to the current situation that the supporting state of the main beam of the bridge girder erection machine randomly changes at any time in the hole-by-hole operation process of the bridge girder erection machine and solve the problems that the structural damage of the main beam of the bridge girder erection machine cannot be found in time and major safety accidents are easily caused.
The technical scheme adopted by the invention is as follows: a bridge girder damage identification and damage degree quantitative analysis method is used for quantitatively analyzing whether a bridge girder of a bridge girder erection machine is damaged, the damage position and the damage degree on the basis of deflection monitoring data obtained in the operation process of the bridge girder erection machine. Based on the current situation that the main beam support changes at any time in the operation process of the bridge girder erection machine, a main beam structure type judging module MI, a damage identification and analysis module MII and a damage quantitative analysis module MIII are established, and the main beam structure type judging module, the damage identification and analysis module and the damage quantitative analysis module are communicated.
The damage identification and analysis module MII comprises: the method comprises the steps of installing a deflection test system; the deflection detection data of each measuring point are collected and processed through matlab program to obtain a deflection influence line f1(x) (ii) a Fourth pair of deflection influence lines f1(x) Data processing is carried out through matlab program to obtain a deflection rate curve f1"(x); fifthly, judging whether mutation occurs; sixthly, judging the damage position and the damage quantity. The damage quantitative analysis module mbii includes: the method comprises the steps of establishing a numerical simulation model according to a bridge girder erection machine structure type; constructing n damage working conditions, and constructing m under each damage working conditionThe degree of the individual injury; thirdly, obtaining the deflection values of different damage degrees under each working condition according to the established simulation model, and then calculating to obtain the corresponding deflection rate, so as to determine the deflection rate-damage degree relation curve under each working condition; and obtaining a relation of the deflection rate and the damage degree of the main girder of the bridge girder erection machine through data processing according to the relation curve of the deflection rate and the damage degree. The main beam structure type judging module MI comprises: determining whether a single-span bridge girder erection machine or a two-span bridge girder erection machine; selecting two positions of the main beam length 1/3 and the main beam length 2/3 as deflection measuring points by the single-span bridge girder erection machine; and selecting the middle position of the two-span main beam as a deflection measuring point by the two-span bridge girder erection machine.
The process of bridge erecting machine girder damage identification and damage degree quantitative analysis is as follows:
the analysis process of the analysis method comprises the following steps: determining the positions and the number of deflection measuring points according to the structure type of a bridge girder erection machine, and entering a damage identification analysis module MII; the damage identification and analysis module is: firstly, collecting deflection detection data of each measuring point for processing to obtain a deflection influence line f1(x) (ii) a ② influence line f to deflection1(x) Data processing is carried out through matlab program to obtain a deflection rate curve f1"(x); (iii) judgment of f1"(x) whether a mutation has occurred; judging whether the structure is damaged or not according to the mutation number and the mutation positions, and determining the damage number and the damage positions; inputting the numerical value of the deflection rate of the damaged part of the main girder into a damage quantitative analysis module MIII; a damage quantitative analysis module: firstly, establishing a damage working condition table with different damage degrees and a deflection rate-damage degree fitting curve by using a bridge girder erection machine simulation model; establishing a curvature curve segmented damage working condition table and a deflection curvature-damage degree relation, and solving a rigidity reduction coefficient at a damage positionζObtaining the specific damage degree of the main beam; and evaluating the reinforced bridge girder, and returning to the step for two.
The invention provides a bridge girder erection machine girder damage identification and damage degree quantitative analysis method which is provided by combining the working condition of a bridge girder erection machine, the modal and physical parameters before the girder erection machine girder is damaged are not needed, the principle is simple, the reliability is high, the method is simple and easy to implement, and the bridge girder erection machine damage identification and damage degree quantitative analysis method is convenient to check and maintain. The gantry crane is suitable for various bridge girder erection machines such as a lower guide beam type gantry crane, a one-span type gantry crane, a two-span continuous beam type gantry crane and a transportation and erection integrated gantry crane and other gantry cranes with similar structural types.
The method for identifying the damage of the main beam of the bridge girder erection machine and quantitatively analyzing the damage degree overcomes the defects that the damage identification technology in the prior art needs the mode and the physical parameters before the main beam of the bridge girder erection machine is damaged, can adapt to the current situation that the supporting state of the main beam of the bridge girder erection machine randomly changes at any time during the hole-by-hole operation of the bridge girder erection machine, and solves the problems that the structural damage of the main beam of the bridge girder erection machine cannot be found in time and serious safety accidents are easily caused. The method is not only suitable for single-point damage, but also suitable for multi-point damage, and solves the problem that the existing structure damage identification technology is disjointed from field application. The method is suitable for bridge cranes and other kinds of gantry cranes, and is simple, convenient, easy, economical and reliable. The damage degree quantitative analysis result measured by the method has the same beneficial effects on the structural safety assessment and the transformation reinforcement of bridge cranes and other types of gantry cranes, and can provide a new design concept and technical guarantee for the safety identification technology of hoisting machinery structures.
Drawings
FIG. 1 is a flow chart of quantitative analysis of the damage and the damage degree of a main beam of the bridge girder erection machine;
FIG. 2 is a graph of deflection influence lines;
FIG. 3 is a graph of deflection rate;
FIG. 4 is a schematic diagram (a) of a deflection rate curve of a main beam structure obtained by the present invention when single-point damage occurs;
FIG. 5 is a graph showing the deflection rate curve at the time of single point damage (b);
FIG. 6 is a schematic diagram of a deflection curve of a main beam structure obtained by the present invention when two points of damage occur respectively;
FIG. 7 is a schematic diagram (a) of a deflection curve of a main beam structure obtained by the present invention when three-point damage occurs;
FIG. 8 is a graph showing a deflection curve at three points of damage (b);
FIG. 9 is a graph showing the deflection rate curves at three points of damage (c);
FIG. 10 is a graph showing a deflection rate curve at three point damage (d);
FIG. 11 is a schematic view of a main beam structure deflection rate-damage degree fitting curve obtained by the present invention (a);
FIG. 12 is a schematic view of a main beam structure deflection rate-damage degree fitting curve (b);
FIG. 13 shows a schematic view of a girder construction deflection rate-damage degree fitting curve (c);
wherein: the system comprises an MI-main beam structure type establishing judgment module, an MII-damage identification analysis module and an MIII-damage quantitative analysis module.
Detailed Description
The present invention will be described in detail with reference to the following examples and drawings. The scope of the invention is not limited to the embodiments, and any modifications made by those skilled in the art within the scope defined by the claims are also within the scope of the invention.
The method for identifying the damage of the main beam of the bridge girder erection machine and quantitatively analyzing the damage degree of the main beam of the bridge girder erection machine comprises the steps of obtaining deflection monitoring data in the operation process of the bridge girder erection machine, and quantitatively analyzing whether the main beam of the bridge girder erection machine is damaged, the damaged position and the damage degree. As shown in fig. 1, a girder structure type judgment Module (MI), a damage identification analysis module mbi and a damage quantitative analysis module mbii are established based on the current situation that a girder support changes at any time in the operation process of the bridge girder erection machine, and the girder structure type judgment module, the damage identification analysis module and the damage quantitative analysis module are communicated with each other. The main beam structure type judging module MI comprises: determining whether a single-span bridge girder erection machine or a two-span bridge girder erection machine; selecting two positions of the length 1/3 and 2/3 of the main beam as deflection measuring points by the single-span bridge girder erection machine; and selecting the middle position of the two-span main beam as a deflection measuring point by the two-span bridge girder erection machine. The damage identification and analysis module MII comprises: the method comprises the steps of installing a deflection test system; acquiring deflection detection data; processing the deflection detection data of each measuring point through the matlab programThen obtaining a deflection influence line f1(x) (ii) a Fourth influencing line f for deflection1(x) Data processing is carried out through matlab program to obtain a deflection rate curve f1"(x); fifthly, judging whether the deflection rate curve has mutation or not; sixthly, judging the damage position and the damage number. The damage quantitative analysis module M III comprises the steps of establishing a numerical simulation model according to a bridge girder erection machine structure type; constructing n damage working conditions, wherein m damage degrees are constructed under each damage working condition; thirdly, obtaining the deflection values of different damage degrees under each working condition according to the established simulation model, and calculating to obtain the corresponding deflection rate, so as to determine the deflection rate-damage degree relation curve under each working condition; and obtaining a relation of the deflection rate and the damage degree of the main girder of the bridge girder erection machine through data processing according to the relation curve of the deflection rate and the damage degree.
The invention discloses a method for identifying damage of a main beam of a bridge girder erection machine and quantitatively analyzing the damage degree, which comprises the following steps:
determining the positions and the number of deflection measuring points according to the structure type of a bridge girder erection machine, and entering a damage identification analysis module MII; the damage identification and analysis module is: firstly, collecting deflection detection data of each measuring point for processing to obtain a deflection influence line f1(x) (ii) a ② influence line f to deflection1(x) Data processing is carried out through matlab program to obtain a deflection rate curve f1"(x); (iii) judgment of f1"(x) whether a mutation has occurred; judging whether the structure is damaged or not according to the mutation number and the mutation positions, and determining the damage number and the damage positions; inputting the numerical value of the deflection rate of the damaged part of the main beam into a damage quantitative analysis module M III; a damage quantitative analysis module: firstly, establishing a damage working condition table with different damage degrees and a deflection rate-damage degree fitting curve by using a bridge girder erection machine simulation model; establishing a curvature curve segmented damage working condition table and a deflection curvature-damage degree relation, and solving a rigidity reduction coefficient at a damage positionζObtaining the specific damage degree of the main beam; and evaluating the reinforced bridge girder, and returning to the step for two.
The following describes the implementation of the present invention in detail by taking two-span continuous beam bridge girder erection machine as an example.
1) Deflection measuring points S are arranged at the midspan positions of the 1 st span and the 2 nd span of the main beamm1、Sm2Installing a deflection test instrument at the deflection test point; the instrument of the test system can be a combination of a strain test system and a displacement meter, and can also adopt other deflection test acquisition systems according to requirements
2) The deflection data of each measuring point are detected and collected by a damage identification and analysis module MI, the format of the deflection data is shown in table 1, the damage data comprises a load position and a deflection numerical value, the deflection detection data of each measuring point are collected by the damage identification and analysis module MI, the deflection detection data are processed by a matlab program, and a deflection influence line f is obtained1(x) The curve of the deflection influence line is shown in FIG. 2;
3) influence line f on deflection1(x) Data processing is carried out through matlab program to obtain a deflection rate curve f1"(x), the deflection curve is shown in FIG. 3;
4) determining the deflection rate curve f1"(x) whether a mutation has occurred;
5) and judging whether the structure is damaged or not according to the mutation quantity and the mutation positions, determining the damage quantity and the damage positions, and inputting the bending curvature value of the damaged part of the main beam into a damage quantitative analysis module M III.
The operation process of the damage quantitative analysis module M III is as follows:
1) and establishing damage working condition tables with different damage degrees by utilizing a bridge girder erection machine simulation model according to the sectional conditions of the deflection rate curve.
(i) Single Point Damage Condition, Table 2 deflection measuring Point Sm1、Sm2The single-point damage working condition table of the main beam of the bridge girder erection machine is S in figure 4m1The deflection curve of the measuring point corresponding to the point damage condition is shown as S in FIG. 5m2A measuring point deflection rate curve corresponding to the point damage working condition; as can be seen from FIGS. 4 and 5, S ism1、Sm2The deflection rate curves of the measuring points have sudden changes of different degrees, and the sudden change positions are consistent with damage areas of all working conditions, which shows that although the heights of all supporting points are different when the bridge girder erection machine works, the deflection rate curves of the main beam measuring points can be effectively utilizedThe location of its lesions is identified.
Table 2 damage condition table for main beam of bridge erecting machine
(II) two-point damage working condition, table 3 two-point damage working condition table of bridge girder erection machine, and S is shown in FIG. 6m1The deflection curvature curve of the measuring point corresponding to the two-point damage condition can be seen from FIG. 6, the S corresponding to the working conditions 19, 20, 21m1The deflection rate curves of the measuring points have two sudden changes at the preset damage positions respectively, which shows that for the main beam of the bridge erecting machine with the difference of the supporting points, the deflection rate curves can be used for effectively identifying the damage positions of single-point damage and two-point damage.
TABLE 3 two-point damage condition table
Thirdly, three-point damage working conditions, wherein the table 4 is a table of three-point damage working conditions of the main beam of the bridge girder erection machine, which is S from the graph of 7 to 10m1The deflection rate curves of the measuring points corresponding to the three-point damage working conditions are shown in fig. 7, in which the working condition 1 is compared with the working condition 41, fig. 8, in which the working condition 1 is compared with the working condition 42, fig. 9, in which the working condition 1 is compared with the working condition 43, and fig. 10, in which the working condition 1 is compared with the working condition 44. As can be seen from FIGS. 5 to 8, S is present under different damage conditionsm1The deflection curvature curves of the measuring points all have three sudden changes, and the sudden change positions are the same as the preset positions of all damage working conditions. In addition, when three damages appear on the same span main beam (working conditions 42 and 44) or different span main beams (working conditions 41 and 43), the ideal identification effect can be obtained by utilizing the bending rate curve, which shows that S is utilizedm1The deflection curve of the measuring point can effectively identify three-point or even multi-point damage in the full-length range of the main beam.
TABLE 4 three-point Damage Condition Table
2) Establishing damage working condition tables with different damage degrees by using a bridge girder erection machine simulation model according to the subsection condition of the deflection rate curve, and using the stiffness reduction coefficient for each working condition as shown in table 5ζ i The rigidity of the steel plate is adjusted,ζ i =(1-0.02i)，itaking an integer from 0 to 20.
TABLE 5 different damage degree working condition table
Fig. 11 to 13 show the fitting curve of the deflection rate to the damage degree of 3 sections, and it can be seen from fig. 11 to 13 that: although the damage sections are different, the bending rate-damage degree fitting curve of each damage working condition is basically in a linear relation, the slope and intercept value of the fitting curve are related to the damage position, the relation among the slope, intercept and damage position of the bending rate-damage fitting curve of each working condition damage position in each damage section can be analyzed respectively, and during analysis, any working condition in each section can be taken as a reference for analysis, and the method comprises the following steps:
working conditionsnBased on the slope and intercept of the flexural-damage fitting relation, the working condition and the working condition of each damage in the section are calculatednSlope ratio and intercept ratio of; using operating conditionsn+1, calculating each damage working condition and working condition based on the slope ratio and intercept ratio of the flexural-damage fitting relational expressionn+1 slope ratio difference and intercept ratio difference; using operating conditionsn+1, calculating each damage working condition and working condition based on the slope ratio difference and intercept ratio differencen+1 unit slope ratio difference and unit intercept ratio difference.
3) The relationship between deflection rate and damage level can be obtained from table 6 for any damage location in section I:
in the formula (I), the compound is shown in the specification, x ′ in order to be the location of the injury,ζthe stiffness reduction factor is expressed in terms of,yrepresenting the degree of deflection.
TABLE 6 section I slope intercept relationship Table
Segment I slope intercept relationship is operating condition 22: (x ′ = 5), and further analysis can obtain a general expression of the relation of the deflection-loss of each section:
in the formula (I), the compound is shown in the specification,k 1for the slope of the selected reference lesion location,k 2in order to be a slope ratio reference,k 3is the mean of the slope ratio difference of the unit,x ′ 1the location of the lesion for the selected slope ratio reference,b 1for the selected reference intercept of the lesion point used,b 2is used as a reference of the intercept ratio,b 3is the mean value of the unit intercept ratio.
4) And similarly, obtaining a relation of the deflection rate and the damage degree of the main beam of the bridge erecting machine:
and the deflection rate curve obtained by the damage identification and analysis module MII is used for determining the deflection rate value corresponding to the damage position after the damage position of the main beam structure is determined, and the deflection rate value is substituted into the formula to obtain the stiffness reduction coefficient of the damage positionζAnd then the specific damage degree of the structural damage part is determined.
Preferably, the deflection data of each measuring point of the girder can be automatically acquired, the measuring period of the deflection of the measuring points of the girder of the bridge girder erection machine can be determined according to the service period of the bridge girder erection machine, the newly-used equipment can be measured once a month, the measuring period can be gradually reduced to half a month along with the increase of the number of use cycles, and even the measuring period is measured once before formal heavy load every day.
The above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. A method for identifying damage of a main beam of a bridge girder erection machine and quantitatively analyzing the damage degree of the main beam of the bridge girder erection machine is used for quantitatively analyzing whether the main beam of the bridge girder erection machine is damaged or not, the damaged position and the damage degree on the basis of deflection monitoring data obtained in the operation process of the bridge girder erection machine, wherein the bridge girder erection machine is a lower guide beam type, a one-span type, a two-span continuous beam type, a transportation and erection integrated bridge girder erection machine and a portal crane with similar structural types; the method is characterized in that: establishing a main girder structure type judging Module (MI), a damage identification and analysis Module (MII) and a damage quantitative analysis Module (MIII) based on the current situation that a main girder support changes at any time in the operation process of a bridge girder erection machine, wherein the main girder structure type judging module, the damage identification and analysis module and the damage quantitative analysis module are communicated; determining the positions of main beam measuring points according to the structural type of the bridge girder erection machine, judging whether the structure is damaged or not, the quantity of the damaged part and the damaged position by detecting the deflection numerical values of the main beam measuring points and utilizing whether the deflection rate curve obtained by a damage identification and analysis Module (MII) has sudden changes or not and the quantity of the sudden changes, and carrying out quantitative analysis on the damage degree of the damaged part of the main beam by utilizing a damage quantitative analysis Module (MIII); the damage quantitative analysis Module (MIII) has the following principle: firstly, establishing a damage working condition table with different damage degrees and a deflection rate-damage degree fitting curve by using a bridge girder erection machine simulation model; secondly, establishing a curvature curve segmented damage working condition table and a deflection curvature-damage degree relational expression; solving the stiffness reduction coefficient zeta of the damage position to obtain the specific damage degree of the main beam.
2. The bridge girder erection machine girder damage identification and damage degree quantitative analysis method according to claim 1, which is characterized in that: the damage identification and analysis Module (MII) comprises: the method comprises the steps of installing a deflection test system; the deflection detection data of each measuring point are processed through a matlab program to obtain a deflection influence line f1 (x); fourthly, data processing is carried out on the deflection influence line f1(x) through a matlab program to obtain a deflection rate curve f1 "(x); fifthly, judging whether mutation occurs; sixthly, judging the damage position and the damage quantity.
3. The bridge girder erection machine girder damage identification and damage degree quantitative analysis method according to claim 1, which is characterized in that: the damage quantification analysis Module (MIII) comprises: the method comprises the steps of establishing a numerical simulation model according to a bridge girder erection machine structure type; constructing n damage working conditions, wherein each damage working condition constructs m damage degrees; thirdly, obtaining the deflection values of different damage degrees under each working condition according to the established simulation model, and calculating to obtain the corresponding deflection rate, so as to determine the deflection rate-damage degree relation curve under each working condition; and obtaining a relation between the deflection rate and the damage degree of the main girder of the bridge girder erection machine through data processing according to the relation curve between the deflection rate and the damage degree.
4. The bridge girder erection machine girder damage identification and damage degree quantitative analysis method according to claim 1, which is characterized in that: the girder construction type determination Module (MI) includes: determining whether a single-span bridge girder erection machine or a two-span bridge girder erection machine; selecting two positions of the main beam length 1/3 and the main beam length 2/3 as deflection measuring points by the single-span bridge girder erection machine; and selecting the midspan position of the two-span main beam as a deflection measuring point by the two-span bridge girder erection machine.
5. The bridge girder erection machine girder damage identification and damage degree quantitative analysis method according to claim 1, which is characterized in that: the analysis process of the analysis method comprises the following steps: determining the positions and the number of deflection measuring points according to the structure type of a bridge girder erection machine, and entering a damage identification and analysis Module (MII); the damage identification and analysis module is: firstly, collecting deflection detection data of each measuring point for processing to obtain a deflection influence line f1 (x); processing data of the deflection influence line f1(x) by a matlab program to obtain a deflection rate curve f1 "(x); thirdly, judging whether f 1' (x) mutates; judging whether the structure is damaged or not according to the mutation number and the mutation positions, and determining the damage number and the damage positions; inputting the numerical value of the deflection rate of the damaged part of the main beam into a damage quantitative analysis module (M III); a damage quantitative analysis module: firstly, establishing a damage working condition table with different damage degrees and a deflection rate-damage degree fitting curve by using a bridge girder erection machine simulation model; secondly, establishing a curvature curve segmented damage working condition table and a deflection curvature-damage degree relation, and solving a rigidity reduction coefficient zeta at a damage position to obtain the specific damage degree of the main beam; and evaluating the reinforced bridge girder, and returning to the step for two.
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| CN110472369B (en) * | 2019-08-28 | 2023-04-07 | 湘潭大学 | Beam structure damage identification method for deflection curvature |
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