Large-span steel box girder residual stress analysis method, device, equipment and medium

Abstract

The invention discloses a method, a device, equipment and a medium for analyzing residual stress of a large-span steel box girder, and the method comprises the steps: screening a current analysis region from a plurality of to-be-analyzed plate surfaces in a large-span steel box girder model, setting three analysis paths which are distributed at intervals in the current analysis region, and carrying out the data collection of the three analysis paths, analyzing the equivalent residual stress field to obtain equivalent stress data information corresponding to each analysis path, and analyzing the equivalent stress data information corresponding to each analysis path along the extension direction of the welding seam according to influence parameters of each analysis path on the corresponding equivalent residual stress field to obtain equivalent stress data information corresponding to each analysis path. According to the method, the residual stress distribution rule of the large-span steel box girder can be accurately analyzed, the influence result of each influence parameter on the residual stress of the large-span steel box girder can also be obtained, and a guarantee is provided for determining the influence reason of the residual stress of the large-span steel box girder.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a method, device, equipment and medium for analyzing residual stress of a large-span steel box girder. Background Art

[0002] The bridge deck of a bridge project is usually constructed by on-site casting or prefabricated assembly. The bridge deck mainly includes steel box girder bridge deck and concrete bridge deck. In the process of prefabricated assembly, the jacking method is a new assembly technology. The specific process of the jacking method is: a construction site is set up on land in the area where the bridge head is located, and the bridge deck is prefabricated on the construction site. After the prefabrication of the bridge deck is completed, the bridge deck is pushed onto the pier using jacks and other jacking mechanisms to complete the construction of the bridge deck.

[0003] During the welding process of the steel box girder, after the welding is completed, the residual stress will cause the steel box girder to deform or be damaged due to stress concentration. However, the distribution law of the residual stress cannot be accurately determined in the prior art. Summary of the invention

[0004] The main purpose of the present invention is to provide a method, device, equipment and medium for analyzing residual stress of a large-span steel box girder, aiming to solve the technical problem that the distribution law of residual stress cannot be accurately determined in the related art.

[0005] To achieve the above object, in a first aspect, the present invention provides a method for analyzing residual stress of a large-span steel box girder, comprising the following steps:

[0006] A current analysis area is selected from a plurality of plates to be analyzed in a large-span steel box girder model, and three analysis paths distributed at intervals are set in the current analysis area; wherein the current analysis area is formed with at least one weld, the three analysis paths all extend along the extension direction of the weld, and the three analysis paths are distributed at intervals along a direction perpendicular to the analysis paths;

[0007] Collecting data for the three analysis paths respectively to obtain equivalent stress data information corresponding to each analysis path;

[0008] According to the influencing parameters of each analysis path on the corresponding equivalent residual stress field, the equivalent stress data information corresponding to each analysis path is analyzed along the extension direction of the weld to obtain the residual stress analysis result of the large-span steel box girder; wherein the influencing parameters include the thickness parameter of the analysis area, the groove angle parameter of the analysis area and the welding sequence of the weld.

[0009] Optionally, the step of analyzing the equivalent stress data information corresponding to each analysis path along the extension direction of the weld according to the influencing parameters of each analysis path on the corresponding equivalent residual stress field to obtain the residual stress analysis result of the long-span steel box girder includes:

[0010] Taking one of the analysis paths as the current analysis path, and obtaining the influencing parameters on the corresponding equivalent residual stress field;

[0011] According to the influencing parameters, along the extension direction of the weld, the equivalent stress data information corresponding to the current analysis path is analyzed to obtain the residual stress analysis result of the long-span steel box girder;

[0012] The remaining two analysis paths are used as the current analysis paths in sequence, and the step of using one of the analysis paths as the current analysis path and obtaining the influencing parameters on the corresponding equivalent residual stress field is returned to be executed until the residual stress analysis results of the large-span steel box girder corresponding to the remaining two analysis paths are obtained.

[0013] Optionally, the step of taking one of the analysis paths as the current analysis path and obtaining the influencing parameters on the corresponding equivalent residual stress field comprises:

[0014] One of the analysis paths is used as the current analysis path, and the thickness parameters of the analysis area, the groove angle parameters of the analysis area and the welding sequence of the weld are collected in sequence to obtain the influencing parameters on the corresponding equivalent residual stress field.

[0015] Optionally, the step of analyzing the equivalent stress data information corresponding to the current analysis path along the extension direction of the weld according to the influencing parameters to obtain the residual stress analysis result of the long-span steel box girder includes:

[0016] According to the thickness parameter in the influencing parameters, the equivalent stress data information corresponding to the current analysis path is analyzed along the extension direction of the weld, the influence result of the thickness of the analysis area on the residual stress of the large-span steel box girder is obtained, and the residual stress analysis result of the large-span steel box girder is formed.

[0017] Optionally, the step of analyzing the equivalent stress data information corresponding to the current analysis path along the extension direction of the weld according to the influencing parameters to obtain the residual stress analysis result of the long-span steel box girder includes:

[0018] According to the groove angle parameter in the influencing parameter, the equivalent stress data information corresponding to the current analysis path is analyzed along the extension direction of the weld, and the influence result of the groove angle in the analysis area on the residual stress of the large-span steel box girder is obtained to form the residual stress analysis result of the large-span steel box girder.

[0019] Optionally, the step of analyzing the equivalent stress data information corresponding to the current analysis path along the extension direction of the weld according to the influencing parameters to obtain the residual stress analysis result of the long-span steel box girder includes:

[0020] According to the welding sequence in the influencing parameters, the equivalent stress data information corresponding to the current analysis path is analyzed along the extension direction of the weld, the influence result of the weld in the analysis area on the residual stress of the large-span steel box girder is obtained, and the residual stress analysis result of the large-span steel box girder is formed.

[0021] Optionally, before the step of selecting a current analysis area from a plurality of to-be-analyzed panels in the long-span steel box girder model and setting three analysis paths distributed at intervals in the current analysis area, the method further includes:

[0022] According to the preset data information of the long-span steel box girder, a long-span steel box girder model corresponding to the long-span steel box girder is established.

[0023] Based on the same technical concept, in a second aspect, the present invention proposes a residual stress analysis device for a large-span steel box girder, comprising:

[0024] A path setting module, used for selecting a current analysis area from a plurality of panels to be analyzed in a large-span steel box girder model, and setting three analysis paths distributed at intervals in the current analysis area;

[0025] A data acquisition module, used to collect data for the three analysis paths respectively, so as to obtain equivalent stress data information corresponding to each analysis path;

[0026] The analysis module is used to analyze the equivalent stress data information corresponding to each analysis path along the extension direction of the weld according to the influencing parameters of each analysis path on the corresponding equivalent residual stress field, so as to obtain the residual stress analysis result of the large-span steel box girder.

[0027] Based on the same technical concept, in the third aspect, the present invention proposes a residual stress analysis device for a large-span steel box girder, wherein the residual stress analysis device for a large-span steel box girder comprises a processor and a memory, wherein a residual stress analysis program for a large-span steel box girder is stored in the memory, and when the residual stress analysis program for a large-span steel box girder is executed by the processor, the residual stress analysis method for a large-span steel box girder described in the first aspect is implemented.

[0028] Based on the same technical concept, in the fourth aspect, the present invention proposes a computer storage medium, on which a computer program is stored. When the computer program is executed by one or more processors, the method for residual stress analysis of a large-span steel box girder described in the first aspect is implemented.

[0029] The technical solution of the present invention selects a current analysis area from multiple plates to be analyzed in a large-span steel box girder model, and sets three analysis paths distributed at intervals in the current analysis area, and respectively collects data for the three analysis paths to obtain equivalent stress data information corresponding to each of the analysis paths, and analyzes the equivalent stress data information corresponding to each of the analysis paths along the extension direction of the weld according to the influencing parameters of the corresponding equivalent residual stress field of each of the analysis paths, to obtain the residual stress analysis result of the large-span steel box girder, so that when the present invention is used, the residual stress distribution law of the large-span steel box girder can be accurately analyzed, and at the same time, according to the thickness parameters of the analysis area obtained by the collection, the groove angle parameters of the analysis area and the welding sequence of the weld, the equivalent stress data can be respectively analyzed, and the influence results of each influencing parameter on the residual stress of the large-span steel box girder can also be obtained, which provides a guarantee for determining the cause of the residual stress influence of the large-span steel box girder. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0031] Figure 1 A flow chart of a residual stress analysis method for a large-span steel box girder according to an example of the present invention;

[0032] Figure 2 for Figure 1 Flow chart of step S300 in the example;

[0033] Figure 3 for Figure 1 Flow chart of step S320 in the example;

[0034] Figure 4 for Figure 3 Flow charts of some specific embodiments exemplified in;

[0035] Figure 5 A schematic diagram of three analysis paths of the analysis zone according to an example of the present invention;

[0036] Figure 6 The welding residual stress field distribution diagram of the present invention is an example;

[0037] Figure 7 It is a schematic diagram of residual stress of the top plate along the weld direction of the analysis area of ​​the example of the present invention;

[0038] Figure 8 It is a schematic diagram of residual stress of the top plate of the analysis area along the plate thickness direction according to an example of the present invention;

[0039] Fig. 9 It is a schematic diagram of residual stress of the top plate of the analysis area perpendicular to the weld direction according to an example of the present invention;

[0040] Fig.10 A schematic diagram of a U-rib path in an analysis area according to an example of the present invention;

[0041] Fig.11 The residual stress diagram of the U-rib in the analysis area of ​​the present invention is an example;

[0042] Fig.12 The residual stress diagram of the U rib along the weld direction in the analysis area of ​​the example of the present invention;

[0043] Fig.13 The residual stress diagram of the U rib along the plate thickness direction in the analysis area of ​​the example of the present invention;

[0044] Fig.14 The residual stress diagram of the U rib perpendicular to the weld direction in the analysis area of ​​the example of the present invention;

[0045] Fig.15 The residual stress diagram of the U rib along the weld direction in the analysis area of ​​the example of the present invention;

[0046] Fig.16 The residual stress distribution diagram corresponding to the top plate thickness of different analysis areas of the present invention is an example;

[0047] Fig.17 The residual stress distribution diagram of the U-rib under the top plate thickness of different analysis areas of the present invention is shown in the example;

[0048] Fig.18 The top plate residual stress distribution diagram of the analysis area with different groove angles of the example of the present invention;

[0049] Fig.19The residual stress distribution diagram of the U-rib with different groove angles according to the example of the present invention;

[0050] Fig. 20 This is a schematic diagram of the path numbering of an example of the present invention;

[0051] Fig.21 The temperature field cloud diagram of the bridge deck U-rib finite element model during the welding heating process at the time of 300s in the first embodiment of the present invention;

[0052] Fig. 22 The temperature field cloud diagram of the bridge deck U-rib finite element model during the welding heating process at the time of 300s in the first embodiment of the present invention;

[0053] Fig.23 The temperature field cloud diagram of the U-rib finite element model of the bridge deck during the welding heating process at the time of 600s in the first embodiment of the present invention;

[0054] Fig.24 The temperature field cloud diagram of the U-rib finite element model of the bridge deck during the welding heating process at the time of 800s in the first embodiment of the present invention;

[0055] Fig.25 The temperature field cloud diagram of the bridge deck U-rib finite element model during the welding heating process at 20000s in the first embodiment of the present invention;

[0056] Fig.26 The equivalent welding residual stress field cloud diagram in the first embodiment of the present invention;

[0057] Fig. 27 A cloud diagram of the longitudinal welding residual stress field in the first embodiment of the present invention;

[0058] Fig.28 The residual stress distribution diagram on paths 1 to 5 in the equivalent welding residual stress field in the first embodiment of the present invention;

[0059] Fig.29 The residual stress distribution diagram on paths 6 to 10 in the equivalent welding residual stress field in the first embodiment of the present invention;

[0060] Fig.30 The residual stress distribution diagram on paths 11 to 15 in the equivalent welding residual stress field in the first embodiment of the present invention;

[0061] Fig.31 The residual stress distribution diagram on paths 16 to 20 in the equivalent welding residual stress field in the first embodiment of the present invention;

[0062] Fig.32The residual stress distribution diagram on paths 1 to 5 in the longitudinal welding residual stress field in the first exemplary embodiment of the present invention;

[0063] Fig.33 The residual stress distribution diagram on paths 6 to 10 in the longitudinal welding residual stress field in the first embodiment of the present invention;

[0064] Fig.34 The residual stress distribution diagram on paths 11 to 15 in the longitudinal welding residual stress field in the first exemplary embodiment of the present invention;

[0065] Fig.35 The residual stress distribution diagram on paths 16 to 20 in the longitudinal welding residual stress field in the first exemplary embodiment of the present invention;

[0066] Fig.36 The temperature field cloud diagram of the temperature field at 600s in the second embodiment of the present invention;

[0067] Fig.37 The temperature field cloud diagram of the temperature field at 1200s in the second embodiment of the present invention;

[0068] Fig.38 The temperature field cloud diagram of the temperature field at 1600s in the second embodiment of the present invention;

[0069] Fig.39 The temperature field cloud diagram of the temperature field at 20000s in the second embodiment of the present invention;

[0070] Fig.40 The temperature field cloud diagram of the temperature field at 20000s in the second embodiment of the present invention;

[0071] Fig.41 The equivalent welding residual stress field cloud diagram in the second embodiment of the present invention;

[0072] Fig.42 A cloud diagram of the longitudinal welding residual stress field in the second embodiment of the present invention;

[0073] Fig.43 The residual stress distribution diagram on paths 1 to 5 in the equivalent welding residual stress field in the second embodiment of the present invention;

[0074] Fig.44 The residual stress distribution diagram on paths 6 to 10 in the equivalent welding residual stress field in the second embodiment of the present invention;

[0075] Fig.45 The residual stress distribution diagram on paths 11 to 15 in the equivalent welding residual stress field in the second embodiment of the present invention;

[0076] Fig.46 The residual stress distribution diagram on paths 16 to 20 in the equivalent welding residual stress field in the second embodiment of the present invention;

[0077] Fig.47 The residual stress distribution diagram on paths 1 to 5 in the longitudinal welding residual stress field in the second embodiment of the present invention;

[0078] Fig.48 The residual stress distribution diagram on paths 6 to 10 in the longitudinal welding residual stress field in the second embodiment of the present invention;

[0079] Fig.49 The residual stress distribution diagram on paths 11 to 15 in the longitudinal welding residual stress field in the second embodiment of the present invention;

[0080] Fig.50 The residual stress distribution diagram on paths 16 to 20 in the longitudinal welding residual stress field in the second embodiment of the present invention;

[0081] Figure 51(a) is a temperature field cloud diagram of the temperature field in the third embodiment of the present invention at 400s; Figure 51(b) is a temperature field cloud diagram of the temperature field in the third embodiment of the present invention at 1200s; Figure 51(c) is a temperature field cloud diagram of the temperature field in the third embodiment of the present invention at 2000s; Figure 51(d) is a temperature field cloud diagram of the temperature field in the third embodiment of the present invention at 2800s; Figure 51(e) is a temperature field cloud diagram of the temperature field in the third embodiment of the present invention at 3600s; Figure 51(f) is a temperature field cloud diagram of the temperature field in the third embodiment of the present invention FIG51( g ) is a temperature field cloud diagram of the temperature field at 5200 s in the third embodiment of the present invention; FIG51( h ) is a temperature field cloud diagram of the temperature field at 6000 s in the third embodiment of the present invention; FIG51( i ) is a temperature field cloud diagram of the temperature field at 6800 s in the third embodiment of the present invention; FIG51( j ) is a temperature field cloud diagram of the temperature field at 7600 s in the third embodiment of the present invention; FIG51( k ) is a temperature field cloud diagram of the temperature field at 60000 s in the third embodiment of the present invention;

[0082] Fig.52 The equivalent welding residual stress field cloud diagram in the third embodiment of the present invention;

[0083] Fig.53 A cloud diagram of the longitudinal welding residual stress field in the third embodiment of the present invention;

[0084] Fig.54The residual stress distribution diagram on paths 1 to 5 in the equivalent welding residual stress field in the third embodiment of the present invention;

[0085] Fig.55 The residual stress distribution diagram on paths 6 to 10 in the equivalent welding residual stress field in the third embodiment of the present invention;

[0086] Fig.56 The residual stress distribution diagram on paths 11 to 15 in the equivalent welding residual stress field in the third embodiment of the present invention;

[0087] Fig.57 The residual stress distribution diagram on paths 16 to 20 in the equivalent welding residual stress field in the third embodiment of the present invention;

[0088] Fig.58 The residual stress distribution diagram on paths 1 to 5 in the longitudinal welding residual stress field in the third embodiment of the present invention;

[0089] Fig.59 The residual stress distribution diagram on paths 6 to 10 in the longitudinal welding residual stress field in the third embodiment of the present invention;

[0090] Fig.60 The residual stress distribution diagram on paths 11 to 15 in the longitudinal welding residual stress field in the third embodiment of the present invention;

[0091] Fig.61 The residual stress distribution diagram on paths 16 to 20 in the longitudinal welding residual stress field in the third embodiment of the present invention;

[0092] Fig.62 This is a structural diagram of a large-span steel box girder device according to an example of the present invention.

[0093] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0094] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0095] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between various mechanisms under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0096] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0097] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0098] The inventive concept of the present invention is further described below in conjunction with some specific implementation methods.

[0099] See also Figures 1 to 62 The present invention proposes some embodiments of a method, device, equipment and medium for analyzing residual stress of a large-span steel box girder.

[0100] See also Figures 1 to 62 The residual stress analysis method of this type of large-span steel box girder includes the following steps:

[0101] S100, selecting a current analysis area from a plurality of to-be-analyzed plate surfaces in a large-span steel box girder model, and setting three analysis paths distributed at intervals in the current analysis area; wherein the current analysis area is formed with at least one weld, the three analysis paths all extend along an extension direction of the weld, and the three analysis paths are distributed at intervals along a direction perpendicular to the analysis paths;

[0102] S200, collecting data for the three analysis paths respectively to obtain equivalent stress data information corresponding to each analysis path;

[0103] S300. According to the influencing parameters of each analysis path on the corresponding equivalent residual stress field, the equivalent stress data information corresponding to each analysis path is analyzed along the extension direction of the weld to obtain the residual stress analysis result of the large-span steel box girder; wherein the influencing parameters include the thickness parameter of the analysis area, the groove angle parameter of the analysis area and the welding sequence of the weld.

[0104] In this embodiment, a current analysis area is selected from multiple plates to be analyzed in a large-span steel box girder model, and three analysis paths with intervals are set in the current analysis area. Data are collected for the three analysis paths respectively to obtain equivalent stress data information corresponding to each analysis path. According to the influencing parameters of each analysis path on the corresponding equivalent residual stress field, the equivalent stress data information corresponding to each analysis path is analyzed along the extension direction of the weld to obtain the residual stress analysis result of the large-span steel box girder. When the present invention is used, the residual stress distribution law of the large-span steel box girder can be accurately analyzed. At the same time, according to the collected thickness parameters of the analysis area, the groove angle parameters of the analysis area and the welding sequence of the weld, the equivalent stress data are analyzed respectively, and the influence results of each influencing parameter on the residual stress of the large-span steel box girder can also be obtained, which provides a guarantee for determining the cause of the residual stress influence of the large-span steel box girder.

[0105] In some specific embodiments, step S300 includes:

[0106] S310, using one of the analysis paths as the current analysis path, and obtaining influencing parameters on the corresponding equivalent residual stress field;

[0107] S320, analyzing the equivalent stress data information corresponding to the current analysis path along the extension direction of the weld according to the influencing parameters to obtain the residual stress analysis result of the long-span steel box girder;

[0108] S330, taking the remaining two analysis paths as the current analysis paths in sequence, and returning to execute the step of taking one of the analysis paths as the current analysis path and obtaining the influencing parameters on the corresponding equivalent residual stress field, until the residual stress analysis results of the large-span steel box girder corresponding to the remaining two analysis paths are obtained.

[0109] In some preferred embodiments, the step of taking one of the analysis paths as the current analysis path and obtaining the influencing parameters on the corresponding equivalent residual stress field comprises:

[0110] One of the analysis paths is used as the current analysis path, and the thickness parameters of the analysis area, the groove angle parameters of the analysis area and the welding sequence of the weld are collected in sequence to obtain the influencing parameters on the corresponding equivalent residual stress field.

[0111] In some exemplary embodiments, step S310 includes:

[0112] S311. According to the thickness parameter in the influencing parameters, the equivalent stress data information corresponding to the current analysis path is analyzed along the extension direction of the weld to obtain the influence result of the thickness of the analysis area on the residual stress of the large-span steel box girder, and form the residual stress analysis result of the large-span steel box girder.

[0113] Of course, step S310 includes:

[0114] S312. According to the groove angle parameter in the influencing parameter, the equivalent stress data information corresponding to the current analysis path is analyzed along the extension direction of the weld, and the influence result of the groove angle in the analysis area on the residual stress of the large-span steel box girder is obtained, so as to form the residual stress analysis result of the large-span steel box girder.

[0115] Of course, step S310 includes:

[0116] S313. According to the welding sequence in the influencing parameters, along the extension direction of the weld, the equivalent stress data information corresponding to the current analysis path is analyzed to obtain the influence result of the weld in the analysis area on the residual stress of the large-span steel box girder, and form the residual stress analysis result of the large-span steel box girder.

[0117] In some specific embodiments, before step S100, the method further includes:

[0118] S400. Establishing a large-span steel box girder model corresponding to the large-span steel box girder according to preset data information of the large-span steel box girder.

[0119] Specifically, three different paths are set on the top plate section of the analysis area to analyze the stress field distribution after welding, including the distribution of residual stress along the weld direction, along the plate thickness direction, and perpendicular to the weld direction. The three paths are set as follows Figure 5 shown.

[0120] Analysis of Mises stress field results after welding: The Von Mises stress yield criterion used in this paper is based on the fourth strength theory. The equivalent stress distribution of three different paths on the top plate of the analysis area is as follows Figure 6 shown.

[0121] From above Figure 6 It can be seen that after welding is completed, the equivalent stress peaks of top plate paths 1, 2, and 3 in the analysis area appear at the center of the weld. It can be clearly seen that the equivalent stress is symmetrically distributed from the center of the weld to the outside. The farther away from the center of the weld, the smaller the equivalent stress is, and it approaches 0 at the farthest end. The equivalent stress peak of path 1 is about 310MPa, which is very close to the yield limit of the material, and the equivalent stress peak of path 2 is about 300MPa. Compared with paths 1 and 2, the peak value of the equivalent stress of path 3 in the center area of ​​the weld has decreased significantly, and its equivalent stress peak has dropped to about 250MPa. This is because the three paths on the top plate of the analysis area are getting farther and farther away from the center of the weld, so the impact of welding is getting weaker and weaker.

[0122] Analysis of residual stress results along the weld direction: The longitudinal residual stress along the weld direction is mainly formed by the longitudinal contraction of the structure. The longitudinal residual stress has a great relationship with the fatigue performance and other properties of the structure. The longitudinal residual stress in the weld area basically exceeds the yield limit of the material. Figure 7 is the distribution of longitudinal residual stress under different paths.

[0123] As above Figure 7 As shown in the figure, there is a peak area of ​​about 0.03m near the weld area. Residual compressive stress appears on paths 2 and 3 on the top plate of the analysis area, which are far away from the weld. Path 1 is close to the weld and has no residual compressive stress. Its peak value of residual tensile stress reaches about 370MPa, which is greater than the yield strength of the material. As the distance from the weld increases, the residual tensile stress on both sides gradually decreases to about 0MPa. Paths 2 and 3 have peak values ​​of residual compressive stress at a distance of about 0.01m from the center of the weld. The peak value of residual compressive stress in path 2 reaches about 80MPa, which is about 22% of the yield strength of the material. The peak value of residual compressive stress in path 3 reaches about 200MPa, which is about 57% of the yield strength of the material.

[0124] Analysis of residual stress results along the plate thickness direction: as above Figure 8As shown in the figure, the residual stress distribution of paths 1, 2, and 3 along the plate thickness direction is very uneven. There are many reasons for such changes, such as phase change of the structure, transverse shrinkage and longitudinal shrinkage of the components, and the residual stress fluctuates greatly. In the area far from the weld, the transverse residual stress has almost no change and can be ignored. In the area close to the weld, the stress changes of the three paths are more complicated, with both residual tensile stress and residual compressive stress. The residual stress variation range of paths 2 and 3 is smaller than that of path 1, varying in the range of 40 to 60 MPa, and its value is about 14% of the yield strength of the material. The transverse residual stress of path 1 is mainly tensile stress, and its peak value can reach about 90 MPa.

[0125] Analysis of residual stress results perpendicular to the weld direction: There are few analyses of residual stress perpendicular to the weld direction, and its distribution and law are relatively complex. The distribution of its residual stress field is as follows Fig. 9 shown.

[0126] As above Fig. 9 As shown in the figure, it can be seen from the residual stress distribution of paths 1, 2, and 3 that the residual stress distribution perpendicular to the weld direction is symmetrically distributed with the weld as the axis. The peak residual stress of paths 1 and 3 occurs at a position 1.5 times the top plate thickness of the analysis area from the weld. From the weld position to both sides, the residual tensile stress of path 1 gradually decreases, with a peak value of about 260MPa; there is almost no residual tensile stress in path 2, and its residual compressive stress gradually decreases, with a peak value of about 140MPa; path 3 has both residual tensile stress and residual compressive stress, with a peak value of about 100MPa for its residual compressive stress and a peak value of about 50MPa for its residual tensile stress.

[0127] When analyzing the residual stress field at different positions of the U-rib, three paths are also set to analyze the residual stress changes on the rib. The three paths are path 1 close to the inside of the U-rib, path 2 close to the center line of the U-rib, and path 3 close to the outside of the U-rib. The starting point of the path is set at the position where the weld groove edge line connects to the U-rib. The schematic diagrams of the three paths are as follows Fig.10 shown.

[0128] Analysis of Mises stress field results after welding:

[0129] From above Fig.11As shown, due to the small thickness of the U-rib plate, the distribution and change trend of the equivalent stress on different paths are almost the same. The equivalent stress not far from the weld drops and then increases, and the equivalent stress on the three paths is evenly distributed along the thickness of the U-rib plate. As the distance from the weld area increases, the equivalent stress gradually decreases from about 330MPa to about 50MPa, and finally drops to about 0MPa as the distance continues to increase. The stress changes faster near the weld area, and the farther away from the weld, the slower the change.

[0130] Analysis of residual stress results along the weld direction: See Fig.12 The longitudinal residual stress of the U-rib is evenly distributed along the thickness of the U-rib, and the distribution and variation trends of the longitudinal residual stress on different paths are almost the same. The maximum value of the residual tensile stress of paths 1, 2, and 3 is between 350 and 400 MPa at a distance close to the weld, which exceeds the yield limit of the material. The peak value of the residual compressive stress is about 150 MPa at a distance of about 2 times the thickness of the rib from the center of the weld. The peak value of the residual compressive stress of path 1 is about 50 MPa, the peak value of the residual compressive stress of path 2 is about 100 MPa, and the peak value of the residual compressive stress of path 3 is about 150 MPa. As the distance from the weld increases, the residual compressive stress of the U-rib gradually decreases and eventually tends to 0.

[0131] Analysis of residual stress results along the thickness direction: The residual stress along the thickness direction of the U-rib gradually decreases from path 1 to 3. The peak value of residual tensile stress along the thickness direction of the U-rib is about 90MPa for path 1, and about 20MPa for path 2. There is almost no residual tensile stress along the thickness direction of the U-rib for path 3, and the peak value of residual compressive stress is 20MPa. The residual stress changes of the U-rib along the thickness direction are as follows: Fig.13 shown.

[0132] Analysis of residual stress results perpendicular to the weld: as above Fig.14 As shown in the figure, it can be seen from paths 1 to 3 that the transverse residual of the U rib perpendicular to the weld direction is relatively small even in the weld area, and the residual stress beyond the weld area is almost negligible. The transverse residual stress of path 1 is in the range of 0 to 20 MPa in the area close to the weld, and gradually tends to 0 after moving away from the weld area. The transverse residual stress of path 2 fluctuates in the range of -10 to 40 MPa. The transverse residual stress value of path 3 begins to decline after reaching a peak value of 30 MPa, and gradually stabilizes after fluctuations.

[0133] Different top plate thicknesses in different analysis areas will lead to different residual stress distributions. Therefore, the top plate thicknesses of the analysis areas are selected as 14mm, 16mm, and 18mm, and other parameters are kept unchanged. The models with different top plate thicknesses in different analysis areas are numerically simulated, and the residual stress distribution of the components is finally obtained as follows Fig.15 shown.

[0134] From above Fig.15 , Fig.16 It can be seen that the top plate of the analysis zone with different thicknesses will affect the magnitude of the longitudinal residual tensile stress. As the thickness of the top plate in the analysis zone increases, the peak residual tensile stress gradually increases from about 340MPa at 14mm to about 290MPa at 18mm. At both ends of the peak area of ​​0.03m close to the weld, the residual tensile stress decreases with the increase of the thickness of the top plate in the analysis zone. At the two ends where the distance from the weld area is getting larger and larger, the thickness of the top plate in the analysis zone has a relatively small effect on the longitudinal residual tensile stress of the top plate in the analysis zone.

[0135] From Figure 16, it can be seen that the top plate thickness of different analysis areas has an impact on the magnitude of the longitudinal residual stress of the U rib, but it will not affect the trend of the residual stress. It can be seen from the figure that near the weld area, as the top plate thickness of the analysis area continues to increase, the overall residual tensile stress value and peak value are constantly increasing; at a distance of about 0.02m from the center of the weld, the peak value of the residual compressive stress appears, and then the residual compressive stress will gradually decrease with the increase of the top plate thickness of the analysis area. The residual compressive stress at a distance far from the weld area gradually tends to 0.

[0136] In the welding simulation process, in order to reduce the influence of the groove angle on the residual stress of the U-rib of the bridge deck, it is very important to select a relatively suitable groove angle for the design of the structure. By analyzing the distribution of the residual stress of the U-rib of the bridge deck at three different groove angles of 45°, 50°, and 55°, the specific results are as follows Fig.17 shown.

[0137] As above Fig.17 , Fig.18 As shown in the figure, through comparative analysis of three different welding groove angles, it is found that the longitudinal residual stress of the top plate in the analysis area has the following distribution law. In the top plate position of the analysis area close to the weld, when the welding groove angle changes from 45° to 55°, the peak longitudinal residual tensile stress of the top plate in the analysis area decreases from about 320MPa to about 270MPa. In the area far from the weld, the effect of the change of the groove angle on the residual stress is not very obvious.

[0138] The trend of the residual stress distribution of the rib plate affected by the groove angle is roughly the same as that of the top plate in the analysis area. At the U-rib position close to the weld, the peak value of the longitudinal residual tensile stress of the U-rib plate decreases during the process of the welding groove angle changing from 45° to 55°. After the residual compressive stress of the structure reaches the peak position, the influence of the change of the groove angle on the residual stress gradually weakens.

[0139] During the construction of orthogonal special-shaped steel bridge decks, not only the structural dimensions of the components themselves will affect the distribution of welding residual stress, but also the welding process such as welding sequence will also affect the welding residual stress of the structure. In order to explore the influence of different welding sequences on the welding residual stress of bridge deck units, the top plate units of the analysis area with 10 U ribs were selected, and three welding schemes were adopted respectively, and the corresponding finite element model was established for welding analysis. Scheme 1 is to weld all the U ribs of the top plate of the analysis area at one time; Scheme 2 is to weld in two times, the first time is to weld 10 U rib welds from left to right, and the second time is to weld all the remaining U rib welds; Scheme 3 is to weld from left to right in 10 times, and only weld two welds of one U rib each time.

[0140] The two welds of each U-rib must be welded at the same time, otherwise the rib plate will be distorted. The path number diagram is as follows Fig.19 As shown in the figure, the paths 1 to 20 along the black arrows represent 20 welds, and the direction of the red arrows represents the welding direction. Three welding schemes are designed for this project as shown in the following table. In each scheme, the welding sequence is carried out in the order of ①②③…….

[0141] Welding sequence plan

[0142]

[0143]

[0144] The temperature field results of Scheme 1 are as follows Figure 20-23 , Fig. 20 - Fig. 22 The temperature field cloud diagram of the U-rib finite element model of the bridge deck during the welding heating process is given. Fig.23 This is the temperature field cloud diagram of the model 20000s after the welding is completed. Fig. 20 - Fig. 22 It can be seen that during the heating process, the temperature at the center of the heat source is always maintained above 2500°C, which is higher than the melting point of the material, 1500°C. Fig.23 It can be seen that when t = 20000s, the global temperature of the component is around 20°C, and it can be considered that the temperature of the component no longer changes.

[0145] As can be seen from the figure below, the peak value of equivalent welding residual stress is mainly distributed in the weld area, with a stress value of about 310-330MPa. The peak value of longitudinal welding residual stress is also concentrated in the weld area, with a tensile stress of about 300-350MPa and a compressive stress of about 300-360MPa.

[0146] In order to observe the distribution of residual stress on each path, the Mises stress after cooling on paths 1 to 20 is extracted, and every five paths are drawn on a graph, as shown below Figure 26 to Figure 29 shown.

[0147] From above Figure 26 to Figure 29 Analysis shows that when welding all welds at once, the distribution trend of the equivalent welding residual stress field on each path is basically the same. It rises first from the arc starting point and then gradually stabilizes, rises again near the arc extinguishing point, and finally reaches the equivalent welding residual stress peak. The peak value finally reached by each path is about 334MPa, and the stable section of all paths is between 500mm and 6500mm from the start of welding. The equivalent welding residual tensile stress in the stable section is basically around 300MPa, and the equivalent welding residual stress decreases slightly near the end of welding.

[0148] Extract the longitudinal welding residual stress on path 1 to path 20, such as Figure 30 to Figure 33 As shown. Analysis shows that when all welds are welded at one time, the longitudinal welding residual stress field distribution trend on each path is basically the same. It rises first from the welding starting point and then gradually stabilizes, and slightly decreases near the end of welding. The peak value of the longitudinal welding residual tensile stress on each path is about 320MPa, appearing between 500mm and 7500mm from the welding starting point. The longitudinal welding residual tensile stress in the stable section is basically around 300MPa, and the longitudinal welding residual stress distribution is relatively uniform.

[0149] The temperature field results of Scheme 2 are as follows Figures 34 to 37 As shown, from Figures 34 to 37 It can be seen that during the first welding heating process, the temperature near the heat source is always maintained at about 2400℃, and during the second welding heating process, the temperature near the heat source is always maintained at about 2300℃, both of which are greater than the melting point of the material 1500℃. During the second welding process, the 10 welds that were welded for the first time gradually cooled down, and the temperature dropped to about 900℃. After the second welding was completed, the temperature of the welds of the first welding dropped to about 300℃. Finally, at 20000s after the second welding was completed, the temperature of the components dropped below 23℃, and it can be considered that the temperature of the components no longer changes.

[0150] The equivalent welding residual stress field cloud diagram and longitudinal welding residual stress field cloud diagram on the component in scheme 2 are as follows Fig.38 , Fig.39As shown in the figure, it can be seen that the peak value of equivalent welding residual stress is mainly distributed in the weld area, and the stress value is about 320-340MPa. The peak value of longitudinal welding residual stress is mainly concentrated near the weld, with tensile stress of about 240-300MPa and compressive stress of about 300-360MPa. The equivalent welding residual stress field on path 1 to path 20 is extracted as follows Figure 40 to Figure 43 shown.

[0151] Up Figure 40 to Figure 43 After the welding is cooled, the distribution trend of the equivalent welding residual stress is basically the same for all the paths of the first welding, showing a pattern of rising first, then falling, and rising again near the end of welding. The residual stress of all the paths of the second welding in the stable stage is about 330MPa.

[0152] Extract the longitudinal welding residual stress field on path 1 to path 20 as follows Figures 44 to 47 As shown. Through analysis, it can be seen that after welding cooling, the longitudinal welding residual tensile stress of all paths of the first welding is about 330MPa in the stable stage, and the distribution trend of the longitudinal welding residual stress is basically the same. For all paths of the second welding, the longitudinal welding residual tensile stress in the stable stage is about 350MPa. Compared with all welds in the first welding, it can be seen that the longitudinal welding residual stress of Scheme 2 is extremely unevenly distributed in the weld area, and the peak value is relatively high. The welding heating temperature field of Scheme 3 is shown in the figure below. It can be seen from the figure that during the welding heating process, the temperature near the heat source is always maintained at about 2400℃, which is greater than the melting point of the material 1500℃. At 60,000s after the end of the last welding, the temperature of the components dropped below 21℃. At this time, it can be considered that the temperature of the components no longer changes.

[0153] The equivalent welding residual stress and longitudinal stress on the components in Scheme 3 are shown in the following cloud diagram: Fig.53 , Fig.54 shown.

[0154] From above Fig.53 , Fig.54 It can be seen that the peak value of equivalent welding residual stress is mainly distributed in the weld area, with a small extension range and a stress value of about 300-340MPa. The peak value of longitudinal welding residual stress is mainly concentrated near the weld, with little difference in stress, with tensile stress of about 240-300MPa and compressive stress of about 300-355MPa.

[0155] Extract the equivalent welding residual stress field on path 1 to path 20 as follows Figures 54 to 57 shown.

[0156] Up Figures 54 to 57From the analysis, it can be seen that the distribution trends of the equivalent welding residual stress on each path of the three schemes, the odd path and the even path are consistent. The odd path first rises and then falls from the arc starting point, and finally rises slightly near the end of welding. The final equivalent welding residual stress is about 280MPa. The even path first rises and then falls from the arc starting point, passes through a stable section, and finally rises slightly near the end of welding. The final equivalent welding residual stress is about 200MPa.

[0157] Extract the longitudinal welding residual stress on path 1 to path 20 as follows Figures 58 to 61 As shown. Through analysis, it can be seen that after welding cooling, the longitudinal welding residual stress field distribution trends of the odd and even paths of Scheme 3 are consistent. The peak value of the longitudinal welding residual tensile stress at the weld of the odd path is about 250MPa, and the peak value of the longitudinal welding residual tensile stress at the weld of the even path is about 150MPa. Compared with the first two schemes, it is found that the peak value of the longitudinal welding residual stress at the weld of this scheme is significantly reduced.

[0158] Based on the same technical concept, in a second aspect, the present invention proposes a residual stress analysis device for a large-span steel box girder, comprising:

[0159] A path setting module, used for selecting a current analysis area from a plurality of panels to be analyzed in a large-span steel box girder model, and setting three analysis paths distributed at intervals in the current analysis area;

[0160] A data acquisition module, used to collect data for the three analysis paths respectively, so as to obtain equivalent stress data information corresponding to each analysis path;

[0161] The analysis module is used to analyze the equivalent stress data information corresponding to each analysis path along the extension direction of the weld according to the influencing parameters of each analysis path on the corresponding equivalent residual stress field, so as to obtain the residual stress analysis result of the large-span steel box girder.

[0162] It should be noted that the functions that can be realized by each module in the residual stress analysis device for large-span steel box girders provided in this embodiment and the corresponding technical effects achieved can refer to the description of the specific implementation methods in each embodiment of the residual stress analysis method for large-span steel box girders of the present invention. For the sake of brevity of the specification, they will not be repeated here.

[0163] Based on the same technical concept, in the third aspect, the present invention proposes a residual stress analysis device for a large-span steel box girder, wherein the residual stress analysis device for a large-span steel box girder comprises a processor and a memory, wherein a residual stress analysis program for a large-span steel box girder is stored in the memory, and when the residual stress analysis program for a large-span steel box girder is executed by the processor, the residual stress analysis method for a large-span steel box girder described in the first aspect is implemented.

[0164] The residual stress analysis equipment for large-span steel box girders refers to terminal equipment or network equipment that can achieve network connection. The residual stress analysis equipment for large-span steel box girders can be terminal equipment such as mobile phones, computers, tablet computers, embedded industrial computers, or network equipment such as servers and cloud platforms.

[0165] like Fig.62 , which is a schematic diagram of the hardware structure of a residual stress analysis device for a large-span steel box girder. The residual stress analysis device for a large-span steel box girder may include: a processor 1001, such as a CPU (Central Processing Unit), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005.

[0166] Those skilled in the art will understand that Fig.62 The hardware structure shown in the figure does not constitute a limitation on the residual stress analysis device for a large-span steel box girder of the present invention, and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components.

[0167] Specifically, the communication bus 1002 is used to realize the connection and communication between these components;

[0168] The user interface 1003 is used to connect to the client and perform data communication with the client. The user interface 1003 may include an output unit, such as a display screen, and an input unit, such as a keyboard;

[0169] The network interface 1004 is used to connect to the backend server and perform data communication with the backend server. The network interface 1004 may include an input / output interface, such as a standard wired interface, a wireless interface, such as a Wi-Fi interface;

[0170] The memory 1005 is used to store various types of data, which may include, for example, instructions of any application or method in the long-span steel box girder residual stress analysis device, as well as data related to the application. The memory 1005 may be a high-speed RAM memory or a stable memory, such as a disk memory. Optionally, the memory 1005 may also be a storage device independent of the processor 1001, and further reference is made to Figure 8, the memory 1005 may include an operating system, a network communication module, a user interface module, and a residual stress analysis program for a large-span steel box girder;

[0171] The processor 1001 is used to call the residual stress analysis program of the long-span steel box girder stored in the memory 1005, and perform the following operations:

[0172] S100, selecting a current analysis area from a plurality of panels to be analyzed in a large-span steel box girder model, and setting three analysis paths distributed at intervals in the current analysis area.

[0173] S200, collecting data for the three analysis paths respectively to obtain equivalent stress data information corresponding to each analysis path;

[0174] S300, according to the influencing parameters of each analysis path on the corresponding equivalent residual stress field, respectively analyze the equivalent stress data information corresponding to each analysis path along the extension direction of the weld to obtain the residual stress analysis result of the long-span steel box girder.

[0175] Based on the same technical concept, in the fourth aspect, the present invention proposes a computer storage medium, on which a computer program is stored. When the computer program is executed by one or more processors, the method for residual stress analysis of a large-span steel box girder described in the first aspect is implemented.

[0176] Based on the same inventive concept, this embodiment provides a computer-readable storage medium, such as a flash memory, a hard disk, a multimedia card, a card-type memory (for example, an SD or DX memory, etc.), a random access memory (RAM), a static random access memory (SRAM), a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a magnetic memory, a disk, an optical disk, a server, etc., on which a computer program is stored, and the computer program can be executed by one or more processors. When the computer program is executed by the processor, all or part of the steps of each embodiment of the residual stress analysis method for a large-span steel box girder of the present invention can be implemented.

[0177] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A method for residual stress analysis of a large-span steel box girder, characterized in that: The steps include: A current analysis area is selected from a plurality of plates to be analyzed in a large-span steel box girder model, and three analysis paths distributed at intervals are set in the current analysis area; wherein the current analysis area is formed with at least one weld, the three analysis paths all extend along the extension direction of the weld, and the three analysis paths are distributed at intervals along a direction perpendicular to the analysis paths; Collecting data for the three analysis paths respectively to obtain equivalent stress data information corresponding to each analysis path; According to the influencing parameters of each analysis path on the corresponding equivalent residual stress field, the equivalent stress data information corresponding to each analysis path is analyzed along the extension direction of the weld to obtain the residual stress analysis result of the large-span steel box girder; wherein the influencing parameters include the thickness parameter of the analysis area, the groove angle parameter of the analysis area and the welding sequence of the weld.

2. The method for analyzing residual stress of a large-span steel box girder according to claim 1, characterized in that: The step of analyzing the equivalent stress data information corresponding to each analysis path along the extension direction of the weld according to the influencing parameters of each analysis path on the corresponding equivalent residual stress field to obtain the residual stress analysis result of the long-span steel box girder includes: Taking one of the analysis paths as the current analysis path, and obtaining the influencing parameters on the corresponding equivalent residual stress field; According to the influencing parameters, along the extension direction of the weld, the equivalent stress data information corresponding to the current analysis path is analyzed to obtain the residual stress analysis result of the long-span steel box girder; The remaining two analysis paths are used as the current analysis paths in sequence, and the step of using one of the analysis paths as the current analysis path and obtaining the influencing parameters on the corresponding equivalent residual stress field is returned to be executed until the residual stress analysis results of the large-span steel box girder corresponding to the remaining two analysis paths are obtained.

3. The method for analyzing residual stress of a large-span steel box girder according to claim 2, characterized in that: The step of taking one of the analysis paths as the current analysis path and obtaining the influencing parameters on the corresponding equivalent residual stress field comprises: One of the analysis paths is used as the current analysis path, and the thickness parameters of the analysis area, the groove angle parameters of the analysis area and the welding sequence of the weld are collected in sequence to obtain the influencing parameters on the corresponding equivalent residual stress field.

4. The method for analyzing residual stress of a large-span steel box girder according to claim 3, characterized in that: The step of analyzing the equivalent stress data information corresponding to the current analysis path along the extension direction of the weld according to the influencing parameters to obtain the residual stress analysis result of the long-span steel box girder includes: According to the thickness parameter in the influencing parameters, the equivalent stress data information corresponding to the current analysis path is analyzed along the extension direction of the weld, the influence result of the thickness of the analysis area on the residual stress of the large-span steel box girder is obtained, and the residual stress analysis result of the large-span steel box girder is formed.

5. The method for analyzing residual stress of a large-span steel box girder according to claim 3, characterized in that: The step of analyzing the equivalent stress data information corresponding to the current analysis path along the extension direction of the weld according to the influencing parameters to obtain the residual stress analysis result of the long-span steel box girder includes: According to the groove angle parameter in the influencing parameter, the equivalent stress data information corresponding to the current analysis path is analyzed along the extension direction of the weld, and the influence result of the groove angle in the analysis area on the residual stress of the large-span steel box girder is obtained to form the residual stress analysis result of the large-span steel box girder.

6. The method for analyzing residual stress of a large-span steel box girder according to claim 3, characterized in that: The step of analyzing the equivalent stress data information corresponding to the current analysis path along the extension direction of the weld according to the influencing parameters to obtain the residual stress analysis result of the long-span steel box girder includes: According to the welding sequence in the influencing parameters, the equivalent stress data information corresponding to the current analysis path is analyzed along the extension direction of the weld, the influence result of the weld in the analysis area on the residual stress of the large-span steel box girder is obtained, and the residual stress analysis result of the large-span steel box girder is formed.

7. The method for analyzing residual stress of a long-span steel box girder according to any one of claims 1 to 6, characterized in that: Before the step of selecting a current analysis area from a plurality of to-be-analyzed panels in the long-span steel box girder model and setting three analysis paths at intervals in the current analysis area, the method further includes: According to the preset data information of the long-span steel box girder, a long-span steel box girder model corresponding to the long-span steel box girder is established.

8. A residual stress analysis device for a large-span steel box girder, characterized in that: include: A path setting module, used for selecting a current analysis area from a plurality of panels to be analyzed in a large-span steel box girder model, and setting three analysis paths distributed at intervals in the current analysis area; A data acquisition module, used to collect data for the three analysis paths respectively, so as to obtain equivalent stress data information corresponding to each analysis path; The analysis module is used to analyze the equivalent stress data information corresponding to each analysis path along the extension direction of the weld according to the influencing parameters of each analysis path on the corresponding equivalent residual stress field, so as to obtain the residual stress analysis result of the large-span steel box girder.

9. A residual stress analysis device for a large-span steel box girder, characterized in that: The large-span steel box girder residual stress analysis device includes a processor and a memory, and a large-span steel box girder residual stress analysis program is stored in the memory. When the large-span steel box girder residual stress analysis program is executed by the processor, the large-span steel box girder residual stress analysis method according to any one of claims 1 to 7 is implemented.

10. A computer storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed by one or more processors, the method for analyzing residual stress of a large-span steel box girder according to any one of claims 1 to 7 is implemented.

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