A method, device and equipment for calculating the deviation threshold of steel beam digital assembly holes

Abstract

A method, device and equipment for calculating the deviation threshold of a hole in digital assembly of a steel beam. The method can calculate the theoretical deformation function model between the axial deformation and the bending deformation of the chord by using the length, width and height of the cantilever section of the chord of the sub-truss section, the allowable stress of the splicing plate, and the angle between the resultant force and the design centerline. Then, the sub-truss section is subjected to finite element analysis under different applied forces to obtain a scatter plot of the tensile deformation and the bending deformation. Then, the theoretical deformation function model is corrected using the scatter plot to obtain a line function graph of the assembly hole deviation threshold of the digital assembly of the steel beam, thereby avoiding the inaccuracy caused by ignoring the factor of the splicing plate in actual application in traditional digital analysis, and simulating and calculating the maximum deformation threshold of the chord, that is, the assembly hole deviation threshold line function graph, to provide precise guidance for the assembly of digital truss sections, thereby optimizing the bridge construction process and improving the construction accuracy and efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of bridge engineering, and in particular to a method, device and equipment for calculating a deviation threshold value of a digital assembly hole of a steel beam. Background Art

[0002] In modern bridge engineering projects, especially those long-span bridge construction that pursue extreme precision and structural integrity, digital assembly technology has become an innovative solution. This technology uses the most advanced 3D scanning and laser measurement technology to provide accurate geometric information for bridge trusses. The acquisition of this high-precision information should theoretically be able to greatly improve the accuracy of truss assembly, reduce errors in construction, and thus optimize the structural stability and performance of the entire bridge.

[0003] However, when the algorithm was used to accurately assemble the reverse model of the truss segment point cloud at the digital level, the final assembly result showed that the assembly deviation value of the end bolt hole center exceeded the conventional threshold of the traditional assembly technology. Although the assembly deviation values ​​of the bolt hole center exceeded expectations, there was a linear relationship between these deviations: if the end of one truss segment of the bridge was properly rotated and translated, the two trusses could be accurately docked.

[0004] Therefore, in the actual assembly process on site, the chord of the sub-truss segment (source truss segment) must undergo some form of forced deformation during the actual construction of the sub-truss segment, which enables the two truss segments to adapt to the deviation of the bolt hole center between each other and finally successfully achieve accurate splicing. Therefore, the traditional assembly threshold is not applicable in digital assembly technology, and the digital assembly threshold needs to be re-evaluated and defined. Summary of the invention

[0005] The present application provides a method, device, equipment and storage medium for calculating the deviation threshold of digital assembly holes of steel beams, which can solve the problem that the digital assembly threshold in the digital assembly technology existing in the prior art is difficult to assemble accurately in actual construction.

[0006] In a first aspect, a method for calculating a deviation threshold of a steel beam digital assembly hole comprises the following steps:

[0007] Based on the length, width and height of the cantilever section of the chord of the sub-truss segment, the allowable stress of the spliced ​​plate, and the angle between the resultant force and the design centerline, the theoretical deformation function model between the axial deformation and the bending deformation of the chord is determined;

[0008] Finite element analysis is performed on the sub-truss segment under different applied forces to obtain scatter plots of tensile deformation and bending deformation; the applied force includes its force value and force angle;

[0009] The theoretical deformation function model is modified based on the scatter plot to obtain a line function graph of the assembly hole deviation threshold value for digital assembly of steel beams.

[0010] In combination with the first aspect, in one implementation, the maximum axial deformation in the theoretical deformation function model is the X-axis, and the maximum bending deformation is the Y-axis; the theoretical deformation function model is a triangular area formed by a linear function between the maximum axial deformation and the maximum bending deformation of the chord and the X-axis and the Y-axis;

[0011] The tensile deformation in the scatter diagram is the x-axis, and the bending deformation is the y-axis; the scatter diagram includes multiple groups of scatter points, each group of scatter points is obtained by applying a force at a set angle from zero loading to the allowable stress; different groups of scatter points correspond to different set angles.

[0012] In combination with the first aspect, in one implementation, the set angle ranges from 0° to 90°.

[0013] In combination with the first aspect, in one implementation, based on the scatter plot, the theoretical deformation function model is corrected to obtain a line function graph of the assembly hole deviation threshold value for digital assembly of steel beams, including the following steps:

[0014] Mark the point corresponding to the allowable stress in each group of scattered points within the set angle range and record it as the target point;

[0015] Connecting a plurality of target points to form a target function line, and then replacing a linear function in the theoretical deformation function model with the target function line;

[0016] The closed area formed by the intersection of the objective function line and the X-axis and the Y-axis in the theoretical deformation function model is used as the assembly hole deviation threshold line function graph.

[0017] In combination with the first aspect, in one implementation, the method further includes the following steps:

[0018] Obtaining the translation length and rotation angle for eliminating the deviation of the digital assembly holes between the sub-truss segment and the parent steel beam, and then mapping them on the assembly hole deviation threshold line function graph, and determining whether they are located within the assembly hole deviation threshold line function graph;

[0019] If so, it means that the sub-beam segment and the mother beam segment can be assembled successfully, otherwise, it means that the sub-beam segment and the mother beam segment cannot be assembled successfully.

[0020] In combination with the first aspect, in one implementation, finite element analysis is performed on the sub-beam segment under different applied forces to obtain a scatter plot of tensile deformation and bending deformation, which includes the following steps:

[0021] The basic model is obtained by reverse modeling the sub-beam segment and the mother beam segment through 3D scanning and laser measurement;

[0022] The basic model is used to establish an FEA finite element analysis model, and then the FEA finite element analysis model is used to perform finite element analysis on the sub-truss segment under different applied forces.

[0023] In combination with the first aspect, in one embodiment, based on the length, width and height of the cantilever section of the chord of the sub-truss segment, the allowable stress of the spliced ​​plate, and the angle between the resultant force and the designed central axis, a theoretical deformation function model between the axial deformation and the bending deformation of the chord is determined, comprising the following steps:

[0024] Decompose the resultant force F into components perpendicular to the central axis and the component parallel to the central axis ;

[0025] The axial deformation of the chord is calculated according to Formula 1: ;

[0026] The bending deformation is calculated according to Formula 2, which is: ;

[0027] Using formula 3 and combining formula 1 and formula 2, we can get the maximum axial deformation ΔL and the maximum bending deformation Δθ of the chord as a linear function relationship;

[0028] The formula three is: ; The linear function relationship is: ;in, is the sum of the axial stress and bending stress of the chord; A is the cross-sectional area of ​​the chord, , E is the elastic modulus of the material, the length of the cantilever section of the chord is a, the width is b, the height is c, the angle between the resultant force F and the central axis is θ, and the allowable stress of the spliced ​​plate is .

[0029] In combination with the first aspect, in one implementation, the calculation formula for the axial stress of the chord is: ;

[0030] The calculation formula of the bending stress of the chord is: ;

[0031] in, is the bending stress; is the axial stress; M is The maximum bending moment caused by the chord; I is the section moment of inertia of the chord, .

[0032] In a second aspect, an embodiment of the present application provides a device for calculating a deviation threshold of a truss segment assembly hole, which includes:

[0033] The first module is used to determine the theoretical deformation function model between the axial deformation and the bending deformation of the chord based on the length, width and height of the chord cantilever section of the sub-truss segment, the allowable stress of the splice plate, and the angle between the resultant force and the design centerline;

[0034] The second module is used to perform finite element analysis on the sub-truss segment under different applied forces to obtain a scatter plot of tensile deformation and bending deformation; the applied force includes its force value and force angle;

[0035] The third module is used to correct the theoretical deformation function model based on the scatter plot to obtain the assembly hole deviation threshold line function graph of the digital assembly of steel beams.

[0036] In a third aspect, an embodiment of the present application provides a device for calculating a deviation threshold value of a truss segment assembly hole, the device comprising a processor, a memory, and a truss segment assembly hole deviation threshold value calculation program stored in the memory and executable by the processor, wherein when the truss segment assembly hole deviation threshold value calculation program is executed by the processor, the steps of the method for calculating the deviation threshold value of a digital assembly hole of a steel beam are implemented.

[0037] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0038] Due to the length, width and height of the cantilever section of the chord through the sub-truss segment, the allowable stress of the splicing plate, and the angle between the resultant force and the design centerline, the theoretical deformation function model between the axial deformation and bending deformation of the chord can be calculated; then the sub-truss segment is subjected to finite element analysis under different applied forces to obtain a scatter plot of the tensile deformation and bending deformation; then the theoretical deformation function model is corrected using the scatter plot to obtain the assembly hole deviation threshold line function graph of the steel beam digital assembly, thereby avoiding the traditional digital analysis ignoring the fact that the splicing plate may be deformed due to material defects, geometric irregularities, or complex boundary conditions in actual applications. The stress distribution is far from uniform due to various factors such as the stress distribution of the bridge truss and the stress distribution of the bridge truss. These complexities are often beyond the prediction range of simple theoretical models, which ultimately leads to inaccurate problems. The above steps can simulate the maximum deformation of the spliced ​​plate under actual construction conditions, and calculate the maximum deformation threshold of the chord, that is, the line function graph of the assembly hole deviation threshold. This is crucial to improve the accuracy of the assembly of bridge trusses during construction, and helps to improve bridge assembly efficiency and reduce the need for rework and correction. This method provides precise guidance for the assembly of digital trusses, thereby optimizing the bridge construction process and improving construction accuracy and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of assembling sub-truss sections and mother truss sections for the truss sections of this application;

[0040] Figure 2This is a schematic diagram of bolt hole numbers for assembling the truss sections of this application;

[0041] Figure 3 This is a schematic diagram of modeling the sub-truss section of the truss section of this application;

[0042] Figure 4 This is a schematic diagram of the theoretical deformation function model of this application;

[0043] Figure 5 It is a schematic diagram of the assembly hole deviation threshold line function graph of the present application;

[0044] Figure 6 This is a schematic diagram of the general flow of a method for calculating the deviation threshold of a steel beam digital assembly hole in the present application. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] First, some technical terms in the present application are explained to facilitate those skilled in the art to understand the present application.

[0047] The present invention belongs to the field of bridge engineering technology, and specifically relates to deformation adaptation technology in the process of assembling bridge truss segments. In particular, the focus is on simulating the deformation of the chord at the connection of bridge truss segments during the assembly of truss segments through finite element analysis (FEA), and calculating the maximum deformation value of the chord at the connection of sub-truss segments based on this simulation. This maximum deformation value is regarded as the hole deviation threshold in the digital assembly of bridge steel beams. The determination of this threshold is intended to optimize the digital assembly process of bridge truss segments and improve the feasibility and accuracy of assembly. It is particularly suitable for bridge engineering projects that require high-precision assembly. Through the present invention, the efficiency of bridge construction and the integrity of the structure can be significantly improved, ensuring the quality and safety of bridge engineering.

[0048] In the actual assembly process on site, the chord of the sub-truss segment (source truss segment) must undergo some form of forced deformation during the actual construction of the sub-truss segment, which enables the two truss segments to adapt to the deviation of the bolt hole center between each other, and finally successfully achieves accurate splicing. Therefore, the traditional assembly threshold is not applicable in digital assembly technology, and the digital assembly threshold needs to be re-evaluated and defined. The reasons are:

[0049] In practical applications, the joint plate may show far from uniform stress distribution due to various factors such as material defects, geometric irregularities, or complex boundary conditions. These complexities are often beyond the prediction range of simple theoretical models.

[0050] Therefore, what we need to solve is: taking into account the influence of the splicing plate, and how to accurately calculate the maximum deformation threshold of the chord (i.e., the line function graph of the assembly hole deviation threshold), so as to provide accurate guidance for the assembly of bridge truss segments during construction.

[0051] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0052] First, refer to Figure 6 The embodiment of the present application provides a method for calculating the deviation threshold of a steel beam digital assembly hole. This method provides accurate guidance for the assembly of digital truss segments, thereby optimizing the bridge construction process and improving construction accuracy and efficiency. The specific implementation steps are as follows:

[0053] Step 100, based on the length, width and height of the cantilever section of the chord of the sub-truss section, the allowable stress of the spliced ​​plate, and the angle between the resultant force and the designed central axis, determine the theoretical deformation function model between the axial deformation and the bending deformation of the chord;

[0054] Step 101, performing finite element analysis on the sub-truss segment under different applied forces to obtain a scatter plot of tensile deformation and bending deformation; the applied force includes its force value and force angle;

[0055] Step 102: Based on the scatter plot, the theoretical deformation function model is modified to obtain a line function graph of the assembly hole deviation threshold value for digital assembly of steel beams.

[0056] Due to the length, width and height of the cantilever section of the chord through the sub-truss segment, the allowable stress of the splicing plate, and the angle between the resultant force and the design centerline, the theoretical deformation function model between the axial deformation and the bending deformation of the chord can be calculated; then the sub-truss segment is subjected to finite element analysis under different applied forces to obtain a scatter plot of the tensile deformation and the bending deformation; then the theoretical deformation function model is corrected using the scatter plot to obtain the assembly hole deviation threshold line function graph of the digital assembly of the steel beam, thereby avoiding the problem that the splicing plate may show a far from uniform stress distribution due to various factors such as material defects, geometric irregularities, or complex boundary conditions in actual applications in traditional digital analysis. These complexities often exceed the prediction range of simple theoretical models, ultimately leading to inaccurate problems. Through the above steps, the maximum deformation that may occur in the splicing plate under actual construction conditions can be simulated, and the maximum deformation threshold of the chord, that is, the assembly hole deviation threshold line function graph, is calculated; it is crucial to improve the accuracy of bridge truss segment assembly during construction, and helps to improve bridge assembly efficiency and reduce the need for rework and correction.

[0057] Among them, the maximum axial deformation in the theoretical deformation function model is the X axis, and the maximum bending deformation is the Y axis; the theoretical deformation function model is a triangular area formed by a linear function between the maximum axial deformation and the maximum bending deformation of the chord and the X axis and the Y axis;

[0058] In the scatter plot, the tensile deformation is the x-axis and the bending deformation is the y-axis; the scatter plot includes multiple groups of scatter points, each group of scatter points is obtained by applying a force at a set angle from zero loading to the allowable stress; different groups of scatter points correspond to different set angles; the range of the set angle is 0°-90°.

[0059] In some preferred embodiments, in step 102, the theoretical deformation function model is corrected based on the scatter plot to obtain a line function graph of the assembly hole deviation threshold value for digital assembly of steel beams, including the following steps:

[0060] Step 10200, mark the point corresponding to the allowable stress in each group of scattered points within the range of 0°-90°, and record it as the target point;

[0061] Step 10201, connect multiple target points to form a target function line, and then replace the linear function in the theoretical deformation function model with the target function line;

[0062] Step 10202: Use the closed area formed by the intersection of the target function line and the X-axis and Y-axis in the theoretical deformation function model as the assembly hole deviation threshold line function graph.

[0063] The method further includes step 10203, obtaining a translation length and a rotation angle for eliminating the deviation of the digital assembly holes between the sub-truss segment and the mother steel beam, and then mapping the translation length and the rotation angle on the assembly hole deviation threshold line function graph, and determining whether the translation length and the rotation angle are within the assembly hole deviation threshold line function graph.

[0064] If so, it means that the sub-beam segment and the mother beam segment can be assembled successfully, otherwise, it means that the sub-beam segment and the mother beam segment cannot be assembled successfully.

[0065] Among them, the sub-truss segment and the mother truss segment are reverse modeled through three-dimensional scanning and laser measurement to obtain the basic model; the basic model is used to establish the FEA finite element analysis model, and then the FEA finite element analysis model is used to perform finite element analysis on the sub-truss segment under different applied forces. Because of the above, the truss segment is reverse modeled through three-dimensional scanning and laser measurement, and the truss segment is connected through the splicing plate through the algorithm. It is found that most of the bolt hole center deviations of the truss segment connection exceed the threshold of traditional assembly. Therefore, in the actual construction of the truss segment, the truss segment and the splicing plate must have undergone forced deformation. Since the mother truss segment is connected to the bridge, its stiffness and the stiffness of the splicing plate are much greater than the stiffness of the sub-truss segment chord. Therefore, the theoretical model is simplified to the deformation of the sub-truss segment chord and no deformation of the splicing plate. In addition, you can refer to Figure 1 and Figure 2 , indicating that the deviation of the bolt hole can represent whether the splicing can be completed. That is to say, when the algorithm is used to accurately assemble the reverse model of the truss segment point cloud at the digital level, the final assembly result shows that the assembly deviation value of the end bolt hole center exceeds the conventional threshold of the traditional assembly technology. Although the assembly deviation values ​​of the bolt hole center are all beyond expectations, there is a linear relationship between these deviations: if the end of a bridge truss segment is properly rotated and translated, the two truss segments can be accurately docked. Figure 1 The mark A is the sub-beam section, and the mark B is the main beam section.

[0066] In some embodiments, the following resultant force and applied force F, the length of the chord cantilever section is a, the width is b, the height is c, and the angle between the resultant force F and the central axis is θ, such as Figure 3 as shown in .

[0067] Step 100, based on the length, width and height of the cantilever section of the chord of the sub-truss section, the allowable stress of the spliced ​​plate, and the angle between the resultant force and the designed central axis, determines a theoretical deformation function model between the axial deformation and the bending deformation of the chord, including the following steps:

[0068] Decompose the resultant force F into components perpendicular to the central axis and the component parallel to the central axis ;

[0069] The axial deformation of the chord is calculated according to Formula 1: ;

[0070] Where A is the cross-sectional area of ​​the chord, , E is the elastic modulus of the material, the length of the cantilever section of the chord is a, the width is b, the height is c, the angle between the resultant force F and the central axis is θ, and the allowable stress of the spliced ​​plate is ;

[0071] The bending deformation is calculated according to Formula 2, which is: ;

[0072] Using formula 3 and combining formula 1 and formula 2, we can get the maximum axial deformation ΔL and the maximum bending deformation Δθ of the chord as a linear function relationship;

[0073] Formula three is: ; The linear function relationship is: ;in, is the sum of the axial stress and the bending stress in the chord.

[0074] The calculation formula of the axial stress of the chord is: ;

[0075] The calculation formula of the bending stress of the chord is: ;

[0076] in, is the bending stress; is the axial stress; M is The maximum bending moment caused by the chord; I is the section moment of inertia of the chord, .

[0077] Here is a detailed description of the process:

[0078] refer to Figure 3 Assuming that the length of the chord cantilever section is a, the width is b, the height is c, and the angle between the resultant force F and the center axis is θ, the allowable stress of the spliced ​​plate is .

[0079] First, we can decompose the resultant force F into its components perpendicular to the central axis: and the component parallel to the central axis :

[0080] (1);

[0081] in, This causes the chord to bend. This causes the chord to deform axially.

[0082] The axial deformation is:

[0083] (2);

[0084] Where A is the cross-sectional area of ​​the chord , E is the elastic modulus of the material.

[0085] Bending angle deformation Calculated by the following formula:

[0086] Depend on The maximum bending moment M caused is:

[0087] (3);

[0088] For the deflection caused by the intermediate bending moment of a simply supported beam, the formula is:

[0089] (4);

[0090] Where I is the area moment of inertia of the chord. For a rectangular cross section with width b and thickness c, its area moment of inertia I is:

[0091] (5);

[0092] Therefore, the bending angle deformation is:

[0093] (6);

[0094] Since the sum of the axial stress and bending stress of the chord cannot exceed the allowable stress of the spliced ​​plate, that is, ;

[0095] Axial stress:

[0096] (7);

[0097] The bending stress is:

[0098] (8);

[0099] The resultant stress should be less than the allowable stress:

[0100] (9);

[0101] Substitute formula (2) and (6) into formula (9);

[0102] (10);

[0103] From formula (10), we can see that when the material of the chord is constant, the maximum axial deformation ΔL and the maximum bending deformation Δθ of the chord are in a linear function relationship, as shown in Figure 4 shown.

[0104] In some preferred embodiments, step 101 is described in detail as follows:

[0105] Although theoretical analysis provides us with a preliminary framework for the safe area of ​​chord deformation, it is often based on the assumption of uniform stress distribution through the maximum axial deformation ΔL and the maximum bending deformation Δθ. However, in practical applications, the spliced ​​plate may exhibit far from uniform stress distribution due to a variety of factors such as material defects, geometric irregularities, or complex boundary conditions. These complexities are often beyond the prediction range of simple theoretical models, and finite element analysis (FEA) can simulate these conditions more accurately and provide deeper insights into the design. FEA not only helps us verify and calibrate theoretical models to ensure that their predictions are consistent with actual performance, but also reveals problems that may be overlooked by theoretical models. Such a comprehensive analysis method makes FEA a key step in ensuring the safety and feasibility of the design, supplementing and strengthening traditional theoretical analysis methods.

[0106] Set the angle of applied force F to gradually increase from 0° to 90°, and then continuously increase the applied force F at each angle to obtain the tensile deformation and bending deformation of the chord until the stress of the chord reaches the allowable stress value. Repeat this step continuously, and I will get a lot of tensile deformation and bending deformation data. Then, with tensile deformation as the x-axis and bending deformation as the y-axis, draw a scatter plot of tensile deformation and bending deformation to correct the function graph of theoretical analysis.

[0107] The specific implementation steps are as follows:

[0108] Step 10100, ① measure and record the specific dimensions of the chord: length a, width b, and height c.

[0109] ②Confirm the material properties of the chord, including but not limited to elastic modulus, yield strength, density, etc.

[0110] ③Confirm the working conditions, including ambient temperature, humidity, etc., which will affect the performance and stress response of the material.

[0111] ④ Set the force angle from 0° to 90°. This range covers loading conditions from pure tension to pure bending.

[0112] Step 10101, setting parameters and working conditions;

[0113] ① Create a parametric analysis process and set the angle of applied force F as a variable in the finite element software. This angle will vary between 0° and 90°.

[0114] ② Set the starting value and incremental step of force F for each angle to ensure that it starts from a smaller load and gradually increases until the structure approaches or reaches the allowable stress.

[0115] Step 10102, applying force and simulating;

[0116] ① Force cycle setting: initialize the force angle to 0°, and set a cycle in the finite element model to gradually increase the angle until 90°. At each angle, start from the set starting force F and gradually increase the force through the cycle.

[0117] ② For each force increment in the cycle, run FEA simulation to calculate the tensile and bending deformations under the current force, and monitor the stress response of the chord in the simulation in real time. Once the stress reaches or approaches the allowable stress, record the deformation at this time and stop increasing the force at that angle.

[0118] ③After reaching the allowable stress at each angle, increase the angle setting and repeat the above simulation process until the full angle range is covered.

[0119] Step 10103: data collection;

[0120] ① Collect and record the tensile deformation and bending deformation at each angle and corresponding force F. The bending angle range is 0°~90°. Record the axial deformation ΔL and bending deformation Δθ of the chord under different tensions and angles in the table. The collection and recording are in the following table:

[0121]

[0122] Step 10104, analysis and drawing;

[0123] ① Using the collected data, draw a scatter plot on the coordinate graph with the tensile deformation as the horizontal axis and the bending deformation as the vertical axis.

[0124] ②Analyze the distribution of the scatter plot and compare the function graph of the theoretical analysis with the FEA results.

[0125] The general content of step 102 is: analyze the distribution of the scatter plot, and compare the function graph of the theoretical analysis and the FEA results. By comparing the theoretical analysis and the FEA scatter plot, the accuracy and applicability of the theoretical function graph are evaluated. According to the FEA results, the theoretical analysis is modified to more accurately reflect the actual structural response. Finally, an accurate function graph of the tensile deformation and bending deformation of the chord under the same allowable stress is obtained, and this function graph is used as the threshold graph for digital assembly. That is, the points corresponding to the allowable stress in each group of scatter points in the range of 0°-90° are marked and recorded as target points; multiple target points are connected to form a target function line, and then the linear function in the theoretical deformation function model is replaced by the target function line; the closed area formed by the intersection of the target function line and the X-axis and Y-axis in the theoretical deformation function model is used as the assembly hole deviation threshold line function graph, and the assembly hole deviation threshold line function graph is referenced. Figure 5 Mark B in .

[0126] Beneficial effects of this application:

[0127] (1) An innovative technical method based on 3D scanning and finite element analysis (FEA) is proposed to determine the threshold of bridge truss assembly deviation. This method can simulate the maximum deformation that may occur in the splicing plate under actual construction conditions, and calculate the maximum deformation threshold function of the chord, which is used as the threshold of digital assembly of bridge steel beams. This technology breaks through the limitations of traditional assembly technology on digital assembly deviation, and provides a calculation basis for the assembly threshold of digital assembly technology through precise simulation and theoretical deduction.

[0128] (2) This technology provides a new theoretical basis and engineering application method for the digital assembly of bridge truss segments by combining FEA with theoretical derivation. It is particularly suitable for bridge engineering projects with high precision requirements.

[0129] (3) By analyzing the deformation of the chord under different working conditions, the scatter plot is innovatively used to correct the function graph of the theoretical analysis, and the deviation threshold determination technology for the digital assembly of steel beams is further optimized.

[0130] (4) This method takes into account the forced deformation of the chord when it is subjected to stress. This stress response analysis is crucial to improving the accuracy of bridge truss segment assembly during construction, and helps to improve bridge assembly efficiency and reduce the need for rework and correction.

[0131] In a second aspect, an embodiment of the present application further provides a device for calculating a deviation threshold of a truss segment assembly hole, which includes:

[0132] The first module is used to determine the theoretical deformation function model between the axial deformation and the bending deformation of the chord based on the length, width and height of the chord cantilever section of the sub-truss segment, the allowable stress of the splice plate, and the angle between the resultant force and the design centerline;

[0133] The second module is used to perform finite element analysis on the sub-truss segment under different applied forces to obtain a scatter plot of tensile deformation and bending deformation; the applied force includes its force value and force angle;

[0134] The third module is used to correct the theoretical deformation function model based on the scatter plot to obtain the assembly hole deviation threshold line function graph of the digital assembly of steel beams.

[0135] Among them, the functional implementation of each module in the above-mentioned truss segment assembly hole deviation threshold calculation device corresponds to the various steps in the above-mentioned steel beam digital assembly hole deviation threshold calculation method embodiment, and its functions and implementation processes will not be repeated here one by one.

[0136] In a third aspect, an embodiment of the present application provides a device for calculating a deviation threshold value of a truss segment assembly hole, which may be a device with a data processing function such as a personal computer (PC), a laptop, a server, an OLT device, etc. In the embodiment of the present application, the device for calculating a deviation threshold value of a truss segment assembly hole may include a processor, a memory, a communication interface, and a communication bus.

[0137] The communication bus can be of any type, and is used to interconnect the processor, memory, and communication interface. The communication interface includes input / output (I / O) interface, physical interface, and logical interface, which are used to interconnect the devices inside the truss assembly hole deviation threshold calculation device, and the interface used to interconnect the truss assembly hole deviation threshold calculation device with other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, an optical fiber interface, an ATM interface, etc.; the user device can be a display (Display), a keyboard (Keyboard), etc. The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical memory, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0138] The processor may be a general-purpose processor, which may call the truss segment assembly hole deviation threshold calculation program stored in the memory and execute the steel beam digital assembly hole deviation threshold calculation method provided in the embodiment of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the truss segment assembly hole deviation threshold calculation program is called may refer to the various embodiments of the steel beam digital assembly hole deviation threshold calculation method of the present application, which will not be described in detail here.

[0139] In a fourth aspect, an embodiment of the present application also provides a computer-readable storage medium.

[0140] The computer-readable storage medium of the present application stores a truss segment assembly hole deviation threshold calculation program, wherein when the truss segment assembly hole deviation threshold calculation program is executed by the processor, the steps of the steel beam digital assembly hole deviation threshold calculation method as described above are implemented. The method implemented when the truss segment assembly hole deviation threshold calculation program is executed can refer to the various embodiments of the steel beam digital assembly hole deviation threshold calculation method of the present application, and will not be repeated here.

[0141] It should be noted that the above-mentioned serial numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments. The terms "including" and "having" in the specification and claims of the present application and the above-mentioned drawings and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, device, product or equipment comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or equipment. The terms "first", "second" and "third" and the like are described to distinguish different objects, etc., and do not represent the order of precedence, nor do they limit that "first", "second" and "third" are different types.

[0142] In the description of the embodiments of the present application, "exemplary", "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary", "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[0143] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0144] In some processes described in the embodiments of the present application, multiple operations or steps that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0145] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present application.

[0146] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for calculating the deviation threshold of a steel beam digital assembly hole, characterized in that: It includes the following steps: Based on the length, width and height of the cantilever section of the chord of the sub-truss section, the allowable stress of the splicing plate, and the angle between the resultant force and the design centerline, a theoretical deformation function model between the axial deformation and the bending deformation of the chord is determined; the maximum axial deformation in the theoretical deformation function model is the X axis, and the maximum bending deformation is the Y axis; the theoretical deformation function model is a triangular area formed by a linear function between the maximum axial deformation and the maximum bending deformation of the chord and the X axis and the Y axis; Finite element analysis is performed on the sub-truss segment under different applied forces to obtain a scatter plot of tensile deformation and bending deformation; the applied force includes its force value and force angle; the tensile deformation in the scatter plot is the x-axis, and the bending deformation is the y-axis; the scatter plot includes multiple groups of scattered points, each group of scattered points is obtained by applying a force at a set angle from zero loading to allowable stress; different groups of scattered points correspond to different set angles; the range of the set angle is 0°-90°; Based on the scatter plot, the theoretical deformation function model is corrected to obtain the assembly hole deviation threshold line function image of the digital assembly of the steel beam; Based on the scatter plot, the theoretical deformation function model is corrected to obtain the assembly hole deviation threshold line function image of the digital assembly of the steel beam, including the following steps: marking the points corresponding to the allowable stress in each group of scattered points within the range of the set angle, and recording them as target points; Connect multiple target points to form a target function line, and then replace the linear function in the theoretical deformation function model with the target function line; use the closed area formed by the intersection of the target function line and the X-axis and Y-axis in the theoretical deformation function model as the assembly hole deviation threshold line function image.

2. The method for calculating the deviation threshold of the steel beam digital assembly hole according to claim 1, characterized in that: The following steps are also included: Obtaining the translation length and rotation angle for eliminating the deviation of the digital assembly holes between the sub-truss segment and the parent steel beam, and then mapping them on the assembly hole deviation threshold line function image, and determining whether they are located within the assembly hole deviation threshold line function image; If so, it means that the sub-beam segment and the mother beam segment can be assembled successfully, otherwise, it means that the sub-beam segment and the mother beam segment cannot be assembled successfully.

3. The method for calculating the deviation threshold of the steel beam digital assembly hole according to claim 1, characterized in that: Finite element analysis of the sub-truss segment under different applied forces is performed to obtain a scatter plot of tensile deformation and bending deformation, which includes the following steps: The basic model is obtained by reverse modeling the sub-beam segment and the mother beam segment through 3D scanning and laser measurement; The basic model is used to establish an FEA finite element analysis model, and then the FEA finite element analysis model is used to perform finite element analysis on the sub-truss segment under different applied forces.

4. The method for calculating the deviation threshold of the steel beam digital assembly hole according to claim 1, characterized in that: Based on the length, width and height of the cantilever section of the chord of the sub-truss segment, the allowable stress of the spliced ​​plate, and the angle between the resultant force and the design centerline, the theoretical deformation function model between the axial deformation and the bending deformation of the chord is determined, including the following steps: Decompose the resultant force F into components perpendicular to the central axis and the component parallel to the central axis ; The axial deformation of the chord is calculated according to Formula 1: ; The bending deformation is calculated according to Formula 2, which is: ; Using formula 3 and combining formula 1 and formula 2, we can get the maximum axial deformation ΔL and the maximum bending deformation Δθ of the chord as a linear function relationship; The formula three is: ; The linear function relationship is: ; in, is the sum of the axial stress and bending stress of the chord; where A is the cross-sectional area of ​​the chord, , E is the elastic modulus of the material, the length of the cantilever section of the chord is a, the width is b, the height is c, the angle between the resultant force F and the central axis is θ, and the allowable stress of the spliced ​​plate is .

5. The method for calculating the deviation threshold of the steel beam digital assembly hole according to claim 4, characterized in that: The following steps are also included: The calculation formula of the axial stress of the chord is: ; The calculation formula of the bending stress of the chord is: ; in, is the bending stress; is the axial stress; M is The maximum bending moment caused by I is the area moment of inertia of the chord, .

6. A device for calculating the deviation threshold of a truss segment assembly hole, characterized in that: It includes: The first module is used to determine the theoretical deformation function model between the axial deformation and the bending deformation of the chord based on the length, width and height of the cantilever section of the chord of the sub-truss section, the allowable stress of the splicing plate, and the angle between the resultant force and the design centerline; the maximum axial deformation in the theoretical deformation function model is the X axis, and the maximum bending deformation is the Y axis; the theoretical deformation function model is a triangular area formed by a linear function between the maximum axial deformation and the maximum bending deformation of the chord and the X axis and the Y axis; The second module is used to perform finite element analysis on the sub-truss segment under different applied forces to obtain a scatter plot of tensile deformation and bending deformation; the applied force includes its force value and force angle; the tensile deformation in the scatter plot is the x-axis, and the bending deformation is the y-axis; the scatter plot includes multiple groups of scattered points, each group of scattered points is obtained by applying a force at a set angle from zero loading to allowable stress; different groups of scattered points correspond to different set angles; the range of the set angle is 0°-90°; The third module is used to correct the theoretical deformation function model based on the scatter plot to obtain the assembly hole deviation threshold line function image of the digital assembly of the steel beam; correcting the theoretical deformation function model based on the scatter plot to obtain the assembly hole deviation threshold line function image of the digital assembly of the steel beam, including the following steps: marking the points corresponding to the allowable stress in each group of scattered points within the range of the set angle, and recording them as target points; Connect multiple target points to form a target function line, and then replace the linear function in the theoretical deformation function model with the target function line; use the closed area formed by the intersection of the target function line and the X-axis and Y-axis in the theoretical deformation function model as the assembly hole deviation threshold line function image.

7. A device for calculating the deviation threshold of a truss segment assembly hole, characterized in that: The girder segment assembly hole deviation threshold calculation device includes a processor, a memory, and a girder segment assembly hole deviation threshold calculation program stored in the memory and executable by the processor, wherein when the girder segment assembly hole deviation threshold calculation program is executed by the processor, the steps of the steel beam digital assembly hole deviation threshold calculation method as described in any one of claims 1 to 4 are implemented.

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