Main cable torsional moment calculation method and related device

Abstract

The invention discloses a main cable torsional moment calculation method and a related device, a suspension bridge finite element model is adopted to calculate the relation between the force and the displacement of a single cable strand at a cable clamp, the torsion of a main cable is converted into the transverse and vertical displacement of the single cable strand, and the torsional moment of the main cable is calculated according to the calculated relation between the force and the displacement. According to the method, the problem that the torsional moment of the main cable is difficult to calculate at present is solved, and the method can be used for calculating the torsional force, caused by construction errors, of the main cable by utilizing a common beam and rod unit integral finite element calculation model in the bridge construction process.

Description

Technical Field

[0001] The invention relates to a main cable torsional moment calculation method and a related device, belonging to the field of bridge main cable erection. Background Art

[0002] The main cable of a suspension bridge is composed of multiple strands, each of which is composed of multiple high-strength steel wires. It is generally installed using the prefabricated parallel strand method (PPWS). After the main cable strand is constructed, the cable clamp is installed. During the installation of the cable clamp, the main cable has low torsional stiffness. Due to factors such as non-uniform temperature field, measurement deviation, and construction deviation, the installation angle deviation is prone to occur after the cable clamp is installed. The deviation is shown in the figure below. Figure 1 , resulting in unbalanced forces (F1, F2) on both sides of the sling fork ear. Therefore, it is necessary to calculate the torsional moment generated by the deflection of the main cable and analyze its influence on the forces on the sling fork ear. Since the main cable is composed of multiple strands, it is difficult to calculate the torsional moment, and there is currently no corresponding method. Summary of the invention

[0003] The present invention provides a main cable torsional moment calculation method and related devices, which solve the problems disclosed in the background technology.

[0004] According to one aspect of the present disclosure, a method for calculating the torsional moment of a main cable is provided, comprising: In the finite element model of the suspension bridge, vertical unit force and transverse unit force are applied at the cable clamp, and the relationship between the force and displacement of a single cable strand at the cable clamp is calculated; According to the deviation after the cable clamp is installed, calculate the vertical and lateral displacement changes of each cable strand caused by the deviation; According to the relationship between force and displacement, as well as the changes in vertical and horizontal displacements, calculate the vertical and horizontal forces of each cable strand; The torsional moment at the cable clamp is calculated based on the vertical and transverse forces of each cable strand and the distance from each cable strand to the center of the main cable.

[0005] In some embodiments of the present disclosure, a vertical unit force and a transverse unit force are applied at a cable clamp in a finite element model of a suspension bridge, and a relationship between a force and a displacement of a single cable strand at the cable clamp is calculated, including: In the finite element model of the suspension bridge, vertical unit force and transverse unit force are applied at the cable clamp, and the vertical displacement and transverse displacement of the main cable under the unit force are calculated; According to the vertical unit force, transverse unit force, vertical displacement and transverse displacement of the main cable, the relationship between the force and displacement of the main cable at the cable clamp is obtained; According to the relationship between the number of strands in the main cable and the force and displacement of the main cable at the cable clamp, the relationship between the force and displacement of a single strand at the cable clamp is obtained.

[0006] In some embodiments of the present disclosure, before calculating the relationship between the force and displacement of a single cable strand at the cable clamp, a step of constructing a finite element model of a suspension bridge and finding the shape of the main cable is also included, and the step includes: The finite element model of the suspension bridge is constructed in the form of beam elements and rod elements; in the finite element model of the suspension bridge, the torsional stiffness and bending stiffness of the main cable are not considered; The main cable shape is found in the finite element model of the suspension bridge to determine the empty cable shape of the main cable.

[0007] In some embodiments of the present disclosure, according to the deviation after the cable clamp is installed, the vertical and lateral displacement changes of each cable strand caused by the deviation are calculated, including: Taking the center of the main cable as the origin, according to the arrangement of the main cable strands, the coordinates of each strand when there is no deviation are obtained; According to the deviation after the cable clamp is installed, the coordinates of each cable strand after rotation are calculated; According to the coordinates of each cable strand when there is no deviation and the coordinates of each cable strand after rotation, the vertical and lateral displacement changes of each cable strand caused by the deviation are obtained.

[0008] According to another aspect of the present disclosure, there is provided a main cable torsional moment calculation device, comprising: The relationship calculation module applies vertical unit force and transverse unit force at the cable clamp in the finite element model of the suspension bridge, and calculates the relationship between the force and displacement of a single cable strand at the cable clamp; The displacement change calculation module calculates the vertical and lateral displacement changes of each cable strand caused by the deviation after the cable clamp is installed; A force calculation module calculates the vertical and lateral forces of each cable strand based on the relationship between force and displacement, and the changes in vertical and lateral displacements; The torsional moment calculation module calculates the torsional moment at the cable clamp according to the vertical and lateral forces of each cable strand and the distance from each cable strand to the center of the main cable.

[0009] In some embodiments of the present disclosure, the relationship calculation module is configured to: In the finite element model of the suspension bridge, vertical unit force and transverse unit force are applied at the cable clamp, and the vertical displacement and transverse displacement of the main cable under the unit force are calculated; According to the vertical unit force, transverse unit force, vertical displacement and transverse displacement of the main cable, the relationship between the force and displacement of the main cable at the cable clamp is obtained; According to the relationship between the number of strands in the main cable and the force and displacement of the main cable at the cable clamp, the relationship between the force and displacement of a single strand at the cable clamp is obtained.

[0010] In some embodiments of the present disclosure, a preprocessing module for constructing a finite element model of a suspension bridge and a main cable shape finding is further included, and the preprocessing module is configured as follows: The finite element model of the suspension bridge is constructed in the form of beam elements and rod elements; in the finite element model of the suspension bridge, the torsional stiffness and bending stiffness of the main cable are not considered; The main cable shape is found in the finite element model of the suspension bridge to determine the empty cable shape of the main cable.

[0011] In some embodiments of the present disclosure, the displacement change calculation module is configured as follows: Taking the center of the main cable as the origin, according to the arrangement of the main cable strands, the coordinates of each strand when there is no deviation are obtained; According to the deviation after the cable clamp is installed, the coordinates of each cable strand after rotation are calculated; According to the coordinates of each cable strand when there is no deviation and the coordinates of each cable strand after rotation, the vertical and lateral displacement changes of each cable strand caused by the deviation are obtained.

[0012] According to another aspect of the present disclosure, a computer-readable storage medium is provided, the computer-readable storage medium storing one or more programs, the one or more programs including instructions, which, when executed by a computing device, cause the computing device to perform a main cable torsional moment calculation method.

[0013] According to another aspect of the present disclosure, a computer device is provided, comprising one or more processors and one or more memories, wherein one or more programs are stored in the one or more memories and are configured to be executed by the one or more processors, and the one or more programs include instructions for executing a main cable torsional moment calculation method.

[0014] The beneficial effects achieved by the present invention are as follows: the present invention adopts a finite element model of a suspension bridge to calculate the relationship between the force and displacement of a single cable strand at a cable clamp, converts the torsion of the main cable into the lateral and vertical displacements of a single cable strand, and obtains the total torsional moment of the main cable at the cable clamp based on the calculated relationship between the force and displacement, thereby solving the current problem of difficulty in calculating the torsional moment of the main cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the deviation; Figure 2 Flow chart of the method for calculating the torsional moment of the main cable; Figure 3 The coordinate diagram of the cable strand before torsion; Figure 4 This is the cable strand coordinate diagram after twisting; Figure 5 Block diagram of the main cable torsional moment calculation device. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. It is obvious that the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0017] Unless otherwise specified, the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure.

[0018] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0019] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0020] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0021] It should be noted that similar symbols and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

[0022] In order to solve the problem of calculating the torsional moment of the main cable, the present disclosure proposes a method for calculating the torsional moment of the main cable.

[0023] Figure 1 This is a schematic diagram of an embodiment of a method for calculating the torsional moment of a main cable disclosed in the present invention. Figure 1 The embodiments may be executed by an analysis device (eg, a computer with analysis software installed).

[0024] like Figure 1 As shown, in step 1 of the embodiment, vertical unit force and transverse unit force are applied at the cable clamp in the finite element model of the suspension bridge, and the relationship between the force and displacement of a single cable strand at the cable clamp is calculated.

[0025] It should be noted that before calculating the relationship between the force and displacement of a single cable strand at the cable clamp, it is necessary to first construct a finite element model of the suspension bridge and find the form of the main cable. The specific process can be: construct a finite element model of the suspension bridge in the form of beam units and rod units, find the form of the main cable in the finite element model of the suspension bridge, and determine the empty cable line shape of the main cable; among which, in the finite element model of the suspension bridge, the torsional stiffness and bending stiffness of the main cable are not considered.

[0026] It should be noted that in the process of bridge construction, the finite element model of the suspension bridge is generally established using cable units, beam units, etc., and the node coordinates are obtained by calculating the coordinates of each bridge component. The suspension bridge is discretized into nodes and units, and a bridge geometric model is established. The material properties and cross-sectional properties are assigned to each unit, and loads and constraints are applied according to actual conditions to perform full bridge calculations. Because the main cable is composed of thousands of thin steel wires, its torsional stiffness and bending stiffness are not considered in conventional calculations. According to the basic principle of catenary calculation, the empty cable line shape of the suspension bridge can be obtained.

[0027] It should be noted that in order to locate the cable clamp, a number, i.e., the cable clamp number, is set for each cable clamp during actual installation. Since the torsional moment generated by the deflection of the main cable needs to be calculated, the cable clamp with deflection is selected to calculate the relationship between force and displacement. The specific process can be as follows: 11) Apply vertical unit force and transverse unit force at the cable clamp in the finite element model of the suspension bridge, and calculate the vertical and transverse displacements of the main cable under the action of the unit force.

[0028] In the empty cable state of the finite element model of the suspension bridge, select the position where you want to calculate the torsion of the main cable, apply a vertical force such as 10kN at this location, and calculate the vertical displacement of the main cable at this location; then apply a transverse bridge force such as 10kN at this location, and calculate the lateral displacement of the main cable at this location.

[0029] 12) Based on the vertical unit force, transverse unit force, vertical displacement and transverse displacement of the main cable, the relationship between the force and displacement of the main cable at the cable clamp is obtained.

[0030] If the vertical displacement at that location is 1cm after a vertical force of 10kN is applied, then the relationship between the vertical force and vertical displacement at that location is 10kN / cm; if the lateral displacement at that location is 2cm after a lateral force of 10kN is applied, then the relationship between the lateral force and lateral displacement at that location is 5kN / cm.

[0031] 13) Based on the relationship between the number of strands in the main cable and the force and displacement of the main cable at the cable clamp, the relationship between the force and displacement of a single strand at the cable clamp is obtained.

[0032] According to the relationship between the main cable force and displacement in step 12) above, for example, if the main cable is composed of 10 cable strands, the relationship between the vertical force and vertical displacement of a single cable strand is 1 kN / cm (defined as δ1); the relationship between the lateral force and lateral displacement of a single cable strand is 0.5 kN / cm (defined as δ2).

[0033] return Figure 1 , step 2 of the embodiment, based on the deviation after the cable clamp is installed, the vertical and lateral displacement changes of each cable strand caused by the deviation are calculated.

[0034] by Figure 1 For example, assuming that the deviation angle is α, in some embodiments, the process of calculating the vertical and lateral displacement changes of each cable strand caused by the deviation can be as follows: 21) Taking the center of the main cable as the origin, according to the arrangement of the main cable strands, obtain the coordinates of each cable strand when there is no deviation.

[0035] See Figure 3 , a coordinate system with the main cable center as the origin is constructed on the cross section. The coordinates of each strand when there is no deviation, that is, the coordinates of the strand center in the coordinate system, can be calculated based on the length L1 between the main cable center and the strand center, and the angle α1 between the main cable center and the strand center and the X-axis. In the figure, the coordinates of the strand S when there is no deviation are (x1, y1).

[0036] 22) Based on the deviation after the cable clamp is installed, calculate the coordinates of each cable strand after rotation.

[0037] It should be noted that the deviation is caused by the rotation of the main cable, which is equivalent to the main cable rotating α around the origin. Figure 4 , the cable strand S is offset. At this time, the angle between the line connecting the center of the main cable and the center of the cable strand S and the X-axis is α1-α=α2, so the coordinates after rotation can be further calculated .

[0038] 23) Based on the coordinates of each cable strand when there is no deviation and the coordinates of each cable strand after rotation, the vertical and lateral displacement changes of each cable strand caused by the deviation are obtained; specifically, By subtracting (x1, y1), that is, subtracting the two horizontal coordinates and the two vertical coordinates, we can obtain the vertical and horizontal displacement changes (△x1, △y1).

[0039] return Figure 1 , step 3 of the embodiment, calculates the vertical and lateral forces of each cable strand based on the relationship between force and displacement, and the changes in vertical and lateral displacements.

[0040] It should be noted that the vertical force calculation formula is △x1×δ1, and the lateral force calculation formula is △y1×δ2.

[0041] return Figure 1 , step 4 of the embodiment, calculates the torsional moment at the cable clamp according to the vertical and lateral forces of each cable strand and the distance from each cable strand to the center of the main cable.

[0042] It should be noted that, assuming that the vertical and lateral forces of strand i are expressed as (Fxi, Fxi), then the moment of strand i can be expressed as Ti = ((Fxi) 2 +(Fyi) 2 ) 0.5 ×Li, then the torsional moment T=ΣTi of the entire main cable at the current cable clamp; where Li is the distance from strand i to the center of the main cable, i=1,..,n, and n is the total number of main cable strands.

[0043] It should be noted that after obtaining the torsional moment at the cable clamp, other parameters such as the forces on both sides of the sling fork ear (F1, F2) can be further calculated according to actual engineering needs to analyze their influence on the forces on the sling fork ear.

[0044] The above method uses the finite element model of the suspension bridge to calculate the relationship between the force and displacement of a single cable strand at the cable clamp, converts the torsion of the main cable into the lateral and vertical displacement of a single cable strand, and obtains the total torsional moment of the main cable at the cable clamp based on the calculated force and displacement relationship, solving the current problem of difficulty in calculating the torsional moment of the main cable. The above method uses the overall finite element calculation model of beams and rods commonly used in the bridge construction process, and can be used to calculate the torsional force of the main cable caused by construction errors.

[0045] Figure 5 Schematic diagram of an embodiment of a main cable torsional moment calculation device disclosed in the present invention. Figure 5 An embodiment of the invention is a virtual device that can be loaded and executed by an analysis device (such as a computer with analysis software installed), and includes a relationship calculation module, a displacement change calculation module, a force calculation module, and a torsional moment calculation module.

[0046] The relationship calculation module of the embodiment is configured to apply vertical unit force and transverse unit force at the cable clamp in the finite element model of the suspension bridge, and calculate the relationship between the force and displacement of a single cable strand at the cable clamp.

[0047] It should be noted that before calculating the relationship between the force and displacement of a single cable strand at the cable clamp, it is necessary to first construct a finite element model of the suspension bridge and find the shape of the main cable. Therefore, the device also includes a preprocessing module for constructing the finite element model of the suspension bridge and finding the shape of the main cable. The preprocessing module is configured to construct the finite element model of the suspension bridge in the form of beam units and rod units; wherein, in the finite element model of the suspension bridge, the torsional stiffness and bending stiffness of the main cable are not considered; the main cable shape is found in the finite element model of the suspension bridge to determine the empty cable line shape of the main cable.

[0048] It should be noted that, in order to locate the cable clamp, a number, namely the cable clamp number, is set for each cable clamp during actual installation. Since the torsional moment generated by the deflection of the main cable needs to be calculated, the cable clamp with deflection is selected to calculate the relationship between force and displacement. Therefore, the relationship calculation module can be configured as follows: vertical unit force and transverse unit force are applied at the cable clamp in the finite element model of the suspension bridge, and the vertical displacement and transverse displacement of the main cable under the action of the unit force are calculated; the relationship between the force and displacement of the main cable at the cable clamp is obtained according to the vertical unit force, the transverse unit force, the vertical displacement and the transverse displacement of the main cable; the relationship between the force and displacement of a single cable strand at the cable clamp is obtained according to the relationship between the number of cable strands in the main cable and the force and displacement of the main cable at the cable clamp.

[0049] The displacement change calculation module of the embodiment is configured to calculate the vertical and lateral displacement changes of each cable strand caused by the deviation according to the deviation after the cable clamp is installed.

[0050] In some embodiments, the displacement change calculation module can be configured as follows: taking the center of the main cable as the origin, according to the placement of the main cable strands, obtaining the coordinates of each cable strand when there is no deviation; according to the deviation after the cable clamp is installed, calculating the coordinates of each cable strand after rotation; according to the coordinates of each cable strand when there is no deviation and the coordinates of each cable strand after rotation, obtaining the vertical and lateral displacement changes of each cable strand caused by the deviation.

[0051] The force calculation module of the embodiment is configured to calculate the vertical and lateral forces of each cable strand according to the relationship between force and displacement, and the vertical and lateral displacement changes.

[0052] The torsional moment calculation module of the embodiment is configured to calculate the torsional moment at the cable clamp according to the vertical and lateral forces of each cable strand and the distance of each cable strand from the center of the main cable.

[0053] Similar to the above method, the device uses the finite element model of the suspension bridge to calculate the relationship between the force and displacement of a single cable strand at the cable clamp, converts the torsion of the main cable into the lateral and vertical displacement of a single cable strand, and obtains the total torsional moment of the main cable at the cable clamp based on the calculated force and displacement relationship, solving the current problem of difficulty in calculating the torsional moment of the main cable. The device uses the overall finite element calculation model of beams and rods commonly used in bridge construction, and can be used to calculate the torsional force of the main cable caused by construction errors.

[0054] Based on the same technical solution, the present disclosure also relates to a computer-readable storage medium, which stores one or more programs, and the one or more programs include instructions. When the instructions are executed by a computing device, the computing device executes a main cable torsional moment calculation method.

[0055] Based on the same technical solution, the present disclosure also relates to a computer device, including one or more processors and one or more memories, one or more programs are stored in the one or more memories and are configured to be executed by the one or more processors, and the one or more programs include instructions for executing the main cable torsional moment calculation method.

[0056] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0057] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0058] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0059] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0060] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A method for calculating the torsional moment of a main cable, characterized in that: include: In the finite element model of the suspension bridge, vertical unit force and transverse unit force are applied at the cable clamp, and the relationship between the force and displacement of a single cable strand at the cable clamp is calculated; According to the deviation after the cable clamp is installed, calculate the vertical and lateral displacement changes of each cable strand caused by the deviation; According to the relationship between force and displacement, as well as the changes in vertical and lateral displacements, calculate the vertical and lateral forces of each cable strand; The torsional moment at the cable clamp is calculated based on the vertical and transverse forces of each cable strand and the distance from each cable strand to the center of the main cable.

2. The method for calculating the torsional moment of the main cable according to claim 1, characterized in that: In the finite element model of the suspension bridge, vertical unit force and transverse unit force are applied at the cable clamp to calculate the relationship between the force and displacement of a single cable strand at the cable clamp, including: In the finite element model of the suspension bridge, vertical unit force and transverse unit force are applied at the cable clamp, and the vertical displacement and transverse displacement of the main cable under the unit force are calculated; According to the vertical unit force, transverse unit force, vertical displacement and transverse displacement of the main cable, the relationship between the force and displacement of the main cable at the cable clamp is obtained; According to the relationship between the number of strands in the main cable and the force and displacement of the main cable at the cable clamp, the relationship between the force and displacement of a single strand at the cable clamp is obtained.

3. The method for calculating the torsional moment of the main cable according to claim 1 or 2, characterized in that: Before calculating the relationship between the force and displacement of a single cable strand at the cable clamp, the steps of constructing a finite element model of the suspension bridge and finding the main cable shape are also included. The steps include: The finite element model of the suspension bridge is constructed in the form of beam elements and rod elements; in the finite element model of the suspension bridge, the torsional stiffness and bending stiffness of the main cable are not considered; The main cable shape is found in the finite element model of the suspension bridge to determine the empty cable shape of the main cable.

4. The method for calculating the torsional moment of the main cable according to claim 1, characterized in that: According to the deviation after the cable clamp is installed, calculate the vertical and lateral displacement changes of each cable strand caused by the deviation, including: Taking the center of the main cable as the origin, according to the arrangement of the main cable strands, the coordinates of each strand when there is no deviation are obtained; According to the deviation after the cable clamp is installed, the coordinates of each cable strand after rotation are calculated; According to the coordinates of each cable strand when there is no deviation and the coordinates of each cable strand after rotation, the vertical and lateral displacement changes of each cable strand caused by the deviation are obtained.

5. A main cable torsional moment calculation device, characterized in that: include: The relationship calculation module applies vertical unit force and transverse unit force at the cable clamp in the finite element model of the suspension bridge, and calculates the relationship between the force and displacement of a single cable strand at the cable clamp; The displacement change calculation module calculates the vertical and lateral displacement changes of each cable strand caused by the deviation after the cable clamp is installed; A force calculation module calculates the vertical and lateral forces of each cable strand based on the relationship between force and displacement, and the changes in vertical and lateral displacements; The torsional moment calculation module calculates the torsional moment at the cable clamp according to the vertical and lateral forces of each cable strand and the distance from each cable strand to the center of the main cable.

6. The main cable torsional moment calculation device according to claim 5, characterized in that: The relational calculation module is configured as follows: In the finite element model of the suspension bridge, vertical unit force and transverse unit force are applied at the cable clamp, and the vertical displacement and transverse displacement of the main cable under the unit force are calculated; According to the vertical unit force, transverse unit force, vertical displacement and transverse displacement of the main cable, the relationship between the force and displacement of the main cable at the cable clamp is obtained; According to the relationship between the number of strands in the main cable and the force and displacement of the main cable at the cable clamp, the relationship between the force and displacement of a single strand at the cable clamp is obtained.

7. The main cable torsional moment calculation device according to claim 5 or 6, characterized in that: It also includes a pre-processing module for constructing a finite element model of a suspension bridge and for finding the main cable shape. The pre-processing module is configured as follows: The finite element model of the suspension bridge is constructed in the form of beam elements and rod elements; in the finite element model of the suspension bridge, the torsional stiffness and bending stiffness of the main cable are not considered; The main cable shape is found in the finite element model of the suspension bridge to determine the empty cable shape of the main cable.

8. The main cable torsional moment calculation device according to claim 5, characterized in that: The displacement change calculation module is configured as follows: Taking the center of the main cable as the origin, according to the arrangement of the main cable strands, the coordinates of each strand when there is no deviation are obtained; According to the deviation after the cable clamp is installed, the coordinates of each cable strand after rotation are calculated; According to the coordinates of each cable strand when there is no deviation and the coordinates of each cable strand after rotation, the vertical and lateral displacement changes of each cable strand caused by the deviation are obtained.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores one or more programs, and the one or more programs include instructions. When the instructions are executed by a computing device, the computing device executes any one of the methods of claims 1 to 4.

10. A computer device, characterized in that: include: One or more processors and one or more memories, one or more programs are stored in the one or more memories and are configured to be executed by the one or more processors, and the one or more programs include instructions for executing any of the methods described in claims 1 to 4.

Images