Method, device, equipment and system for determining cable force of bridge stay cable and medium

Abstract

The invention relates to the technical field of bridge maintenance, in particular to a method, a device, equipment, a system and a medium for determining cable force of a bridge stay cable, by collecting current parameter information of the stay cable under the circumferential constraint effect and the self-weight extrusion effect, the cable force of the stay cable is determined according to the current parameter information, and the cable force of the stay cable is determined. Establishing an unconstrained cable force solving functional equation of the stay cable, establishing a correction framework for obtaining the cable force of the stay cable according to the current parameter information, correcting the cable force solving functional equation by using the correction framework to obtain a target function, and performing solving operation by using the target function to obtain the cable force of the stay cable. Therefore, when the stay cable force calculation method is used, the defect of inaccurate cable force calculation caused by the annular constraint effect and the self-weight extrusion effect can be avoided, the calculation precision of the cable force is improved, and the calculation error of the cable force is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge maintenance, and in particular to a method, device, equipment, system and medium for determining the cable force of a bridge cable. Background Art

[0002] The cable is one of the important components of the cable-stayed bridge. In order to improve the durability of the steel strand, a high-density polyethylene outer sleeve is usually installed on the outside of the cable. In the field of engineering, the cable force frequency relationship formula derived from string theory is often used to calculate the cable force. This formula is simple and easy to use, but the accuracy is limited. When the frequency method is used to measure the cable force of the steel strand cable, the sensor is generally placed on the outer sleeve. After the steel strand cable is tensioned and the tension of a single steel strand is adjusted evenly, a cable clamp device is installed near the anchor end of the tower and beam to make the internal steel strand present a regular hexagonal shape. However, before the cable is finally tensioned, since the diameter of the cable anchor plate is larger than the diameter of the high-density polyethylene sleeve, the high-density polyethylene outer sleeve plays a circumferential constraint on the internal steel strand during the tensioning process of the cable. In addition, due to the self-weight of the sleeve and other reasons, a large error is generated when the frequency method is used to measure the cable force of the steel strand cable. Summary of the invention

[0003] The main purpose of the present application is to provide a method, device, equipment, system and medium for determining the cable tension of a bridge, aiming to solve the technical problem in the related art that due to the deadweight of the casing and other reasons, a large error occurs when the frequency method is used to measure the cable tension of the steel strand cable.

[0004] To achieve the above purpose, the present application proposes a method for determining the cable force of a bridge, comprising the following steps:

[0005] Collecting current parameter information of the inclined cable under the action of circumferential constraint and deadweight extrusion; wherein the circumferential constraint is provided by an outer sleeve sleeved on the outer periphery of the inclined cable;

[0006] According to the current parameter information, a cable force solving function equation of the unconstrained inclined cable is established; wherein the cable force solving function equation is expressed by formula 1, and the formula 1 is:

[0007]

[0008] is the inertia force per unit length of the cable, is the restoring force due to cable bending, is the tension effect caused by the cable tension T, the inclined cable tends to keep the cable in a straight state, T is the tension of the inclined cable, ρ is the linear density of the inclined cable, EI is the equivalent bending stiffness of the cable, u is the target solution direction of the cable force of the inclined cable, and u(x, t) is the displacement function of the inclined cable in the x direction;

[0009] According to the current parameter information, a correction framework for obtaining the cable force of the stay cable is established;

[0010] The cable force solution function equation is corrected using a correction framework to obtain an objective function, wherein the objective function is expressed using Formula 2, which is:

[0011]

[0012] ρ eff is the corrected linear density, T c is the equivalent additional tension due to the annular constraint of the outer casing, EI c is the equivalent additional bending stiffness due to the extrusion contact of the outer casing; F contact is the distributed force due to extrusion contact;

[0013] The objective function is used to perform a solution operation to obtain the cable force of the inclined cable.

[0014] In one embodiment, the step of establishing a correction framework for obtaining the cable force of the stay cable according to the current parameter information comprises:

[0015] According to the current parameter information, a first correction function is established to obtain an equivalent stiffness correction result of the cable; wherein the first correction function is expressed by Formula 3, which is:

[0016] S eff =Sk s ,

[0017] S is the original tension, k s is a correction factor greater than 1, the k s The value of is determined according to the material and thickness of the outer sleeve and the restraint method of the inclined cable;

[0018] A second correction function is established to obtain a correction result of the mass distribution of the cable; wherein the second correction function is expressed by formula 4, which is:

[0019] m eff =m(1+m c ),

[0020] m is the original linear density, m cis the additional mass ratio caused by the contact between the outer casing and the inclined cable;

[0021] Obtaining a vibration modal correction result of the stay cable;

[0022] The correction framework is obtained by combining the first correction function, the second correction function and the vibration mode correction result.

[0023] In one embodiment, the step of obtaining the vibration modal correction result of the inclined cable includes:

[0024] Performing a modal deviation identification operation on the current parameter information to filter out modal deviation data from the current parameter information;

[0025] Analyze and obtain the deviation cause of the modal deviation data;

[0026] Based on the cause of the deviation, a third correction function is established; wherein the third correction function is expressed using Formula 5, which is:

[0027]

[0028] M is a mass matrix, which contains the mass information of each node of the cable; K is the vibration mode correction result of the cable; φ i is the i-th order mode shape vector, ω i is the i-th order natural frequency;

[0029] The third correction function is used to perform a solution operation to obtain a vibration mode correction result of the inclined cable.

[0030] In one embodiment, the step of performing a modal deviation identification operation on the current parameter information to filter out modal deviation data from the current parameter information includes:

[0031] Performing a modal deviation identification operation on the current parameter information to extract vibration modal parameters of the cable from the current parameter data;

[0032] The vibration modal parameters are compared and analyzed with preset modal parameters to filter out deviation data from the vibration modal parameters.

[0033] In one embodiment, before the step of using the correction framework to correct the cable force solution function equation to obtain the objective function, the step further includes:

[0034] Establishing a contact mechanics model of the cable according to the current parameters;

[0035] The contact condition is determined from the mechanical contact model, and a balance equation for solving the distributed force is established; wherein the balance equation is expressed using Formula 6, which is:

[0036] F contact =∫A contact P(x,y)dA

[0037] A contact is the contact area, and P(x,y) is the contact force pressure distribution function.

[0038] In one embodiment, the step of determining the contact condition from the mechanical contact model and establishing a balance equation for solving the distributed force includes:

[0039] The contact condition is determined from the mechanical contact model, and the pressure distribution function is established according to the contact condition; wherein the pressure distribution function is expressed by Formula 7, which is:

[0040]

[0041]

[0042] F is the normal force acting on the contact model, l and w are the sizes of the contact model; u is the displacement along the X direction, v is the displacement along the Y direction, F(x, y) and G(x, y) are the stress components corresponding to the contact pressure p(x, y), E is the Young's modulus, and v0 is the Poisson's ratio;

[0043] The equilibrium equation is established in combination with the pressure distribution function.

[0044] Based on the same technical concept, in a second aspect, the present invention also proposes a device for determining the cable force of a bridge cable, comprising:

[0045] A collection module collects current parameter information of the inclined cable under the action of circumferential constraint and deadweight extrusion; wherein the circumferential constraint is provided by an outer sleeve sleeved on the outer periphery of the inclined cable;

[0046] A first modeling module is used to establish a cable force solving function equation of the unconstrained inclined cable according to the current parameter information;

[0047] A second modeling module is used to establish a correction framework for obtaining the cable force of the inclined cable according to the current parameter information;

[0048] An acquisition module, using a correction framework to correct the cable force solution function equation to obtain an objective function;

[0049] The result output module uses the objective function to perform a solution operation to obtain the cable force of the inclined cable.

[0050] Based on the same technical concept, in the third aspect, the present invention also proposes a device for determining the tension of a bridge cable, the device comprising a processor and a memory, the memory storing a program for determining the tension of a bridge cable, and when the program for determining the tension of a bridge cable is executed by the processor, the method for determining the tension of a bridge cable described in the first aspect is implemented.

[0051] Based on the same technical concept, in a fourth aspect, the present invention further proposes a system for determining the cable force of a bridge cable, comprising:

[0052] The device for determining the tension of the bridge cable according to the third aspect; and

[0053] A data acquisition device is installed on the inclined cable, and the data acquisition device is communicatively connected with the acquisition sensor and transmits the collected data information to the device for determining the cable force of the bridge inclined cable.

[0054] Based on the same technical concept, in the fifth aspect, the present invention further proposes a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by one or more processors, the method for determining the cable tension of a bridge cable as described in the first aspect is implemented.

[0055] One or more technical solutions proposed in this application have at least the following technical effects:

[0056] The technical solution of the present application collects current parameter information of the inclined cable under the action of annular constraint and self-weight extrusion, establishes a cable force solution function equation of the unconstrained inclined cable according to the current parameter information, establishes a correction framework for obtaining the cable force of the inclined cable according to the current parameter information, uses the correction framework to correct the cable force solution function equation to obtain the target function, uses the target function to perform a solution operation to obtain the cable force of the inclined cable, and thus enables the present invention to avoid the defects of inaccurate cable force calculation caused by the annular constraint and self-weight extrusion when in use, improves the calculation accuracy of the cable force, and reduces the calculation error of the cable force. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the description, are used to explain the principles of the present application.

[0058] In order to more clearly illustrate the embodiments of the present application 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, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0059] Figure 1 A flow chart of a method for determining the cable tension of a bridge cable according to an example of this application;

[0060] Figure 2 for Figure 1 Flow chart of step S300 in the example;

[0061] Figure 3 for Figure 2 Schematic diagram of the process of step S330 in the example;

[0062] Figure 4 for Figure 3 Schematic diagram of the process of step S331 in the example;

[0063] Figure 5 Flow charts of some specific embodiments of the present invention;

[0064] Figure 6 for Figure 5 Flow chart of step S700 in the example;

[0065] Figure 7 This is a schematic diagram of the structure of the device for determining the cable tension of a bridge cable as an example of this application.

[0066] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0067] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0068] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0069] See also Figures 1 to 7 The present application proposes a method for determining the cable force of a bridge in a first embodiment, comprising the following steps:

[0070] S100, collecting current parameter information of the inclined cable under the action of circumferential constraint and deadweight extrusion; wherein the circumferential constraint is provided by an outer sleeve sleeved on the outer periphery of the inclined cable;

[0071] S200, establishing a cable force solution function equation of the unconstrained inclined cable according to the current parameter information; wherein the cable force solution function equation is expressed by Formula 1, and Formula 1 is:

[0072]

[0073] is the inertia force per unit length of the cable, is the restoring force due to cable bending, is the tension effect caused by the cable tension T, the inclined cable tends to keep the cable in a straight state, T is the tension of the inclined cable, ρ is the linear density of the inclined cable, EI is the equivalent bending stiffness of the cable, u is the target solution direction of the cable force of the inclined cable, and u(x, t) is the displacement function of the inclined cable in the x direction;

[0074] In this embodiment, when establishing the force solving function equation, variables should be defined first. Specifically, the variables of the example should include:

[0075] T: The tension of the cable (or axial force).

[0076] EI: Equivalent bending stiffness of the cable (may vary due to the influence of the outer casing).

[0077] ρ: Linear density of the cable (may include part of the mass of the outer casing).

[0078] l: length of the cable.

[0079] x, y, z: spatial coordinates of a point on the cable.

[0080] u(x,t), v(x,t), w(x,t): displacement function of the cable in the x, y, and z directions (varying with time t and space x)

[0081] Of course, during the specific implementation, the boundary conditions should also be determined: the process is to determine the boundary conditions of the vibration equation based on the actual constraints of the cable (such as both ends fixed, one end fixed and the other end free, etc.) and the influence of the outer sleeve.

[0082] Initial conditions: The process is to give the displacement and velocity distribution of the cable at the initial moment.

[0083] S300, establishing a correction framework for obtaining the cable force of the stay cable according to the current parameter information;

[0084] It should be particularly and clearly stated that, in this embodiment, the correction framework of the example is a correction function, and the correction function is:

[0085]

[0086] S400, using a correction framework to correct the cable force solution function equation to obtain an objective function, wherein the objective function is expressed by Formula 2, which is:

[0087]

[0088] ρ eff is the corrected linear density, T c is the equivalent additional tension due to the annular constraint of the outer casing, EI c is the equivalent additional bending stiffness due to the extrusion contact of the outer casing; F contact is the distributed force due to extrusion contact;

[0089] Of course, in specific implementation, the vibration equations in the v and w directions can also be established separately. Specifically,

[0090] For unconstrained cable-stayed cables, when considering their vibration, we usually need to consider displacements in three directions at the same time: axial (usually along the length of the cable, denoted as u), and two lateral displacements (perpendicular to the length of the cable, denoted as v and w). However, in the vibration analysis of cable-stayed cables, due to the slender characteristics and high axial stiffness of the cable, it can usually be assumed that the axial displacement u has little effect on the lateral vibration, so that the main focus is on the lateral vibration (v and w directions).

[0091] Based on the Euler-Bernoulli beam theory (which, although it is primarily used for straight beams, is a reasonable starting point here and can be further modified to accommodate the special case of a cable), we can write the mathematical structure of the vibration equations for a cable in the v and w directions. Note, however, that for cables, especially when considering wind loading, geometric nonlinearity, or the interaction of the cable with the supporting structure, more complex models such as Timoshenko beam theory or continuum dynamics models may be required.

[0092] However, to give the basic mathematical structure, we can start with the following form:

[0093] V-direction vibration equation

[0094]

[0095] in:

[0096] ρ is the density of the cable.

[0097] A is the cross-sectional area of ​​the cable.

[0098] C v is the damping coefficient in the v direction (may be zero, depending on whether damping is considered).

[0099] T is the tension in the cable, which may vary along the length of the cable, but is assumed to be constant here.

[0100] EI is the bending stiffness of the cable.

[0101] F v (x,t) is the external force acting in the v direction (such as wind load, seismic load, etc., if considered).

[0102] The vibration equation in the w direction is similar to that in the v direction. The vibration equation in the w direction can be written as:

[0103]

[0104] in:

[0105] C w is the damping coefficient in the w direction.

[0106] F w (x,t) is the external force acting in the w direction.

[0107] Tension T: In a stay cable, the tension T may not be constant but may vary with the cable length and vibration state. This may need to be accounted for by a more complex model.

[0108] Geometric nonlinearity: When the vibration amplitude of the cable is large, it may be necessary to consider geometric nonlinear effects, such as elongation and shape change of the cable.

[0109] Coupling effects: In actual situations, the vibrations in the v and w directions may be coupled, that is, the vibration in one direction affects the vibration in the other direction. This may require modifying the above equations by introducing coupling terms.

[0110] Boundary conditions: The vibration equations require appropriate boundary conditions to be solved. These conditions depend on how the cable is supported (e.g., fixed at both ends, fixed at one end and free at the other, etc.).

[0111] Numerical methods: Due to the complexity of the above equations, numerical methods are usually required to solve them, such as finite element method, finite difference method or modal analysis.

[0112] S500: performing a solution operation using the objective function to obtain the cable force of the inclined cable.

[0113] In this embodiment, by collecting current parameter information of the inclined cable under the action of annular constraint and self-weight extrusion, a cable force solution function equation of the unconstrained inclined cable is established according to the current parameter information, and a correction framework for obtaining the cable force of the inclined cable is established according to the current parameter information. The cable force solution function equation is corrected by using the correction framework to obtain the objective function, and the objective function is used to perform a solution operation to obtain the cable force of the inclined cable. As a result, when the present invention is used, the defect of inaccurate cable force calculation caused by the annular constraint and self-weight extrusion is avoided, the calculation accuracy of the cable force is improved, and the calculation error of the cable force is reduced.

[0114] In one embodiment, step S300 includes:

[0115] S310. Establish a first correction function according to the current parameter information to obtain an equivalent stiffness correction result of the cable; wherein the first correction function is expressed by Formula 3, which is:

[0116] S eff =Sk s ,

[0117] S is the original tension, k s is a correction factor greater than 1, the k s The value of is determined according to the material and thickness of the outer sleeve and the restraint method of the inclined cable;

[0118] S320, establishing a second correction function to obtain a correction result of the mass distribution of the cable; wherein the second correction function is expressed by Formula 4, which is:

[0119] m eff =m(1+m c ),

[0120] m is the original linear density, m c is the additional mass ratio caused by the contact between the outer casing and the inclined cable;

[0121] S330, obtaining a vibration mode correction result of the stay cable;

[0122] S340: Combining the first correction function, the second correction function and the vibration mode correction result to obtain the correction framework.

[0123] In one embodiment, step S330 includes:

[0124] S331, performing a modal deviation identification operation on the current parameter information to filter out modal deviation data from the current parameter information;

[0125] S332, analyzing and obtaining the deviation cause of the modal deviation data;

[0126] S333. Based on the cause of the deviation, establish a third correction function; wherein the third correction function is expressed using Formula 5, which is:

[0127]

[0128] M is a mass matrix, which contains the mass information of each node of the cable; K is the vibration mode correction result of the cable; φ i is the i-th order mode shape vector, ω i is the i-th order natural frequency;

[0129] S334. Perform a solution operation using the third correction function to obtain a vibration mode correction result of the inclined cable.

[0130] In one embodiment, step S331 includes:

[0131] S331a, performing a modal deviation identification operation on the current parameter information to extract vibration modal parameters of the cable from the current parameter data;

[0132] S331b, comparing and analyzing the vibration modal parameters with preset modal parameters to filter out deviation data from the vibration modal parameters.

[0133] In one embodiment, before step S400, the method further includes:

[0134] S600, establishing a contact mechanics model of the stay cable according to the current parameters;

[0135] S700, determining contact conditions from the mechanical contact model, and establishing a balance equation for solving the distributed force; wherein the balance equation is expressed using Formula 6, which is:

[0136] F contact =∫A contact P(x,y)dA

[0137] A contact is the contact area, and P(x,y) is the contact force pressure distribution function.

[0138] In one embodiment, step S700 includes:

[0139] S710, determining contact conditions from the mechanical contact model, and establishing the pressure distribution function according to the contact conditions; wherein the pressure distribution function is expressed using Formula 7, which is:

[0140]

[0141] F is the normal force acting on the contact model, l and w are the sizes of the contact model; u is the displacement along the X direction, v is the displacement along the Y direction, F(x, y) and G(x, y) are the stress components corresponding to the contact pressure p(x, y), E is the Young's modulus, and v0 is the Poisson's ratio;

[0142] In this embodiment, the exemplary contact pressure can be obtained in the following manner, specifically:

[0143] In contact mechanics, the calculation of contact pressure distribution usually depends on the specific contact model, material properties and contact conditions. Due to the complexity of these factors, there is no single, universal calculation formula that can be directly applied to all situations. However, I can give a typical calculation formula for contact pressure distribution based on Hertzian contact theory, which is a common method for dealing with contact problems between two elastic bodies.

[0144] Hertz contact theory assumes that the stress in the contact area does not exceed the elastic limit, the contact surface size is much smaller than the radius of curvature of the contact point of the objects, and the pressure distributed along the contact surface is perpendicular to the contact surface. In this case, the contact surface is usually rectangular (for point contact) or rectangular (for line contact).

[0145] For point contact (such as contact between a ball and a plane), the contact surface is a rectangle, and the contact pressure distribution on it can be approximated as:

[0146]

[0147] in:

[0148] p(x,y) is the contact pressure at any point (x,y) on the contact surface.

[0149] p0 is the maximum contact pressure on the contact surface, usually located at the center of the rectangle.

[0150] a and b are the length and width of the rectangular contact surface, respectively.

[0151] In practical applications, more accurate calculations usually require the use of numerical methods such as finite element analysis (FEA). FEA can take into account factors such as the complex geometry of the contact bodies, material nonlinearity, friction of the contact surfaces, and dynamic loading conditions, thereby obtaining a more accurate contact pressure distribution.

[0152] For specific calculation formulas, such as the maximum contact pressure p0 and the length and width a and b of the contact rectangle in Hertz contact theory, they can be calculated by the following formula (taking the contact between a ball and a plane as an example):

[0153]

[0154] in:

[0155] F is the normal force acting on the contacting bodies.

[0156] R is the radius of the contact sphere.

[0157] v1 and v2 are the Poisson's ratios of the two contacting bodies, respectively.

[0158] E1 and E2 are the elastic moduli of the two contacting bodies, respectively.

[0159] E * is the equivalent elastic modulus, which is determined by the elastic modulus and Poisson's ratio of the two contacting bodies and is expressed as:

[0160]

[0161] It should be noted that these formulas are only applicable within the assumptions of Hertz contact theory, and appropriate corrections and adjustments may be required in practical applications. In addition, different calculation methods and formulas are required for different contact situations (such as line contact, surface contact, etc.).

[0162]

[0163] This formula is an equivalent form of the previous example formula, except that the unnecessary fraction line is removed and E is explicitly * Place it on the left side of the equation as the quantity being defined.

[0164] The boundary conditions of the pressure distribution function are:

[0165] In the contact area, p(x,y)≥0.

[0166] Outside the contact area, p(x,y)=0.

[0167] At the contact region boundary, the tangential stress is zero.

[0168] S720: Establish the equilibrium equation in combination with the pressure distribution function.

[0169] Based on the same technical concept, in a second aspect, the present invention also proposes a device for determining the cable force of a bridge cable, comprising:

[0170] A collection module collects current parameter information of the inclined cable under the action of circumferential constraint and deadweight extrusion; wherein the circumferential constraint is provided by an outer sleeve sleeved on the outer periphery of the inclined cable;

[0171] A first modeling module is used to establish a cable force solving function equation of the unconstrained inclined cable according to the current parameter information;

[0172] A second modeling module is used to establish a correction framework for obtaining the cable force of the inclined cable according to the current parameter information;

[0173] An acquisition module, using a correction framework to correct the cable force solution function equation to obtain an objective function;

[0174] The result output module uses the objective function to perform a solution operation to obtain the cable force of the inclined cable.

[0175] The device for determining the tension of a bridge cable provided in the embodiment of the present application adopts the method for determining the tension of a bridge cable in the above embodiment, which can solve the technical problem that a large error is generated when the tension of a steel strand cable is measured by the frequency method due to the deadweight of the casing and other reasons. Compared with the prior art, the beneficial effects of the device for determining the tension of a bridge cable provided in the embodiment of the present application are the same as the beneficial effects of the method for determining the tension of a bridge cable provided in the above embodiment, and other technical features in the device for determining the tension of a bridge cable are the same as the features disclosed in the above embodiment method, which will not be described in detail here.

[0176] Based on the same technical concept, in the third aspect, the present invention also proposes a device for determining the tension of a bridge cable, the device comprising a processor and a memory, the memory storing a program for determining the tension of a bridge cable, and when the program for determining the tension of a bridge cable is executed by the processor, the method for determining the tension of a bridge cable described in the first aspect is implemented.

[0177] Reference below Figure 7 , which shows a schematic diagram of the structure of a device for determining the cable tension of a bridge cable suitable for implementing an embodiment of the present application. The device for determining the cable tension of a bridge cable in the embodiment of the present application may include but is not limited to mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted control terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 7 The device shown for determining the tension of the bridge cable is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0178] like Figure 7As shown, the device for determining the cable force of a bridge cable may include a processing device 1001 (such as a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM) 1004. Various programs and data required for the operation of the device for determining the cable force of a bridge cable are also stored in the RAM 1004. The processing device 1001, the ROM 1002, and the RAM 1004 are connected to each other via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems may be connected to the I / O interface 1006: input devices 1007 including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; storage devices 1003 including, for example, a magnetic tape, a hard disk, etc.; and communication devices 1009. The communication device 1009 may allow the device for determining the tension of a bridge cable to communicate wirelessly or wired with other devices to exchange data. Although the figure shows a device for determining the tension of a bridge cable with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems may be implemented or have instead.

[0179] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0180] The device for determining the tension of a bridge cable provided by the present application adopts the method for determining the tension of a bridge cable in the above embodiment, which can solve the technical problem that a large error is generated when the tension of a steel strand cable is measured by the frequency method due to the deadweight of the casing and other reasons. Compared with the prior art, the beneficial effects of the device for determining the tension of a bridge cable provided by the present application are the same as the beneficial effects of the method for determining the tension of a bridge cable provided by the above embodiment, and other technical features of the device for determining the tension of a bridge cable are the same as the features disclosed in the method of the previous embodiment, which will not be described in detail here.

[0181] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0182] In addition, the device for determining the tension of a bridge cable provided in the embodiment of the present application can solve the technical problem that a large error is generated when the tension of a steel strand cable is measured by the frequency method due to the deadweight of the casing and other reasons. Compared with the prior art, the beneficial effects of the device for determining the tension of a bridge cable provided in the embodiment of the present application are the same as the beneficial effects of the method for determining the tension of a bridge cable provided in the above embodiment, and other technical features in the device for determining the tension of a bridge cable are the same as the features disclosed in the above embodiment method, which will not be described in detail here.

[0183] Based on the same technical concept, in a fourth aspect, the present invention further proposes a system for determining the cable force of a bridge cable, comprising:

[0184] The device for determining the tension of the bridge cable according to the third aspect; and

[0185] A data acquisition device is installed on the inclined cable, and the data acquisition device is communicatively connected with the acquisition sensor and transmits the collected data information to the device for determining the cable force of the bridge inclined cable.

[0186] In addition, the system for determining the tension of a bridge cable provided in the embodiment of the present application can solve the technical problem that a large error is generated when the tension of a steel strand cable is measured using the frequency method due to reasons such as the deadweight of the casing. Compared with the prior art, the beneficial effects of the system for determining the tension of a bridge cable provided in the embodiment of the present application are the same as the beneficial effects of the method for determining the tension of a bridge cable provided in the above embodiment, and other technical features of the system for determining the tension of a bridge cable are the same as the features disclosed in the above embodiment method, which will not be described in detail here.

[0187] Based on the same technical concept, in the fifth aspect, the present invention further proposes a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by one or more processors, the method for determining the cable tension of a bridge cable as described in the first aspect is implemented.

[0188] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0189] The computer-readable storage medium may be included in the device for determining the cable tension of a bridge cable; or may exist independently without being assembled into the device for determining the cable tension of a bridge cable.

[0190] The computer-readable storage medium carries one or more programs. When the one or more programs are executed by a device for determining the tension of a bridge cable, the device for determining the tension of a bridge cable can implement the method for determining the tension of a bridge cable described above.

[0191] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0192] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0193] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0194] The readable storage medium provided by the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned method for determining the cable tension of a bridge cable, and can solve the technical problem that a large error is generated when the cable tension of a steel strand cable is measured by the frequency method due to reasons such as the deadweight of the casing. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by the present application are the same as the beneficial effects of the method for determining the cable tension of a bridge cable provided by the above-mentioned embodiment, and will not be described in detail here.

[0195] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A method for determining the cable force of a bridge, characterized in that: The steps include: Collecting current parameter information of the inclined cable under the action of circumferential constraint and deadweight extrusion; wherein the circumferential constraint is provided by an outer sleeve sleeved on the outer periphery of the inclined cable; According to the current parameter information, a cable force solving function equation of the unconstrained inclined cable is established; wherein the cable force solving function equation is expressed by formula 1, and the formula 1 is: is the inertia force per unit length of the cable, is the restoring force due to cable bending, is the tension effect caused by the cable tension T, the inclined cable tends to keep the cable in a straight state, T is the tension of the inclined cable, ρ is the linear density of the inclined cable, EI is the equivalent bending stiffness of the cable, u is the target solution direction of the cable force of the inclined cable, and u(x, t) is the displacement function of the inclined cable in the x direction; According to the current parameter information, a correction framework for obtaining the cable force of the stay cable is established; The cable force solution function equation is corrected using a correction framework to obtain an objective function, wherein the objective function is expressed using Formula 2, which is: ρ eff is the corrected linear density, T c is the equivalent additional tension due to the annular constraint of the outer casing, EI c is the equivalent additional bending stiffness due to the extrusion contact of the outer casing; F contact is the distributed force due to extrusion contact; The objective function is used to perform a solution operation to obtain the cable force of the inclined cable.

2. The method for determining the cable force of a bridge according to claim 1, characterized in that: The step of establishing a correction framework for obtaining the cable force of the stay cable according to the current parameter information comprises: According to the current parameter information, a first correction function is established to obtain an equivalent stiffness correction result of the cable; wherein the first correction function is expressed by Formula 3, which is: S eff =Sk s , S is the original tension, k s is a correction factor greater than 1, the k s The value of is determined according to the material and thickness of the outer sleeve and the restraint method of the inclined cable; A second correction function is established to obtain a correction result of the mass distribution of the cable; wherein the second correction function is expressed by formula 4, which is: m eff =m(1+m c ), m is the original linear density, m c is the additional mass ratio caused by the contact between the outer casing and the inclined cable; Obtaining a vibration modal correction result of the stay cable; The correction framework is obtained by combining the first correction function, the second correction function and the vibration mode correction result.

3. The method for determining the cable force of a bridge according to claim 2, characterized in that: The step of obtaining the vibration mode correction result of the inclined cable comprises: Performing a modal deviation identification operation on the current parameter information to filter out modal deviation data from the current parameter information; Analyze and obtain the deviation cause of the modal deviation data; Based on the cause of the deviation, a third correction function is established; wherein the third correction function is expressed using Formula 5, which is: M is a mass matrix, which contains the mass information of each node of the cable; K is the vibration mode correction result of the cable; φ i is the i-th order mode shape vector, ω i is the i-th order natural frequency; The third correction function is used to perform a solution operation to obtain a vibration mode correction result of the inclined cable.

4. The method for determining the cable force of a bridge according to claim 3, characterized in that: The step of performing a modal deviation identification operation on the current parameter information to filter out modal deviation data from the current parameter information includes: Performing a modal deviation identification operation on the current parameter information to extract vibration modal parameters of the cable from the current parameter data; The vibration modal parameters are compared and analyzed with preset modal parameters to filter out deviation data from the vibration modal parameters.

5. The method for determining the cable force of a bridge according to claim 4, characterized in that: Before the step of using the correction framework to correct the cable force solution function equation to obtain the objective function, the step further includes: Establishing a contact mechanics model of the cable according to the current parameters; The contact condition is determined from the mechanical contact model, and a balance equation for solving the distributed force is established; wherein the balance equation is expressed using Formula 6, which is: F contact =∫A contact P(x,y)dA A contact is the contact area, and P(x, y) is the contact force pressure distribution function.

6. The method for determining the cable force of a bridge according to claim 5, characterized in that: The step of determining the contact conditions from the mechanical contact model and establishing a balance equation for solving the distributed force comprises: The contact condition is determined from the mechanical contact model, and the pressure distribution function is established according to the contact condition; wherein the pressure distribution function is expressed by Formula 7, which is: F is the normal force acting on the contact model, l and w are the dimensions of the contact model; u is the displacement along the X direction, v is the displacement along the Y direction, F(x, y) and G(x, y) are the stress components corresponding to the contact pressure p(x, y), E is the Young's modulus, and v0 is the Poisson's ratio; The equilibrium equation is established in combination with the pressure distribution function.

7. A device for determining the tension of a bridge cable, characterized in that: include: A collection module collects current parameter information of the inclined cable under the action of circumferential constraint and deadweight extrusion; wherein the circumferential constraint is provided by an outer sleeve sleeved on the outer periphery of the inclined cable; A first modeling module is used to establish a cable force solving function equation of the unconstrained inclined cable according to the current parameter information; A second modeling module is used to establish a correction framework for obtaining the cable force of the inclined cable according to the current parameter information; An acquisition module, using a correction framework to correct the cable force solution function equation to obtain an objective function; The result output module uses the objective function to perform a solution operation to obtain the cable force of the inclined cable.

8. A device for determining the tension of a bridge cable, characterized in that: The device for determining the tension of a bridge cable comprises a processor and a memory, wherein the memory stores a program for determining the tension of a bridge cable. When the program for determining the tension of a bridge cable is executed by the processor, the method for determining the tension of a bridge cable as described in any one of claims 1 to 6 is implemented.

9. A system for determining the tension of a bridge cable, characterized in that: include: The device for determining the tension of a bridge stay cable as claimed in claim 8; as well as, A data acquisition device is installed on the inclined cable, and the data acquisition device is communicatively connected with the acquisition sensor and transmits the collected data information to the device for determining the cable force of the bridge inclined cable.

10. A computer-readable 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 determining the cable tension of a bridge cable according to any one of claims 1 to 6 is implemented.

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