Simulation optimization design method and system for stay cable tower top hanger

Abstract

The invention relates to the technical field of simulation optimization design, in particular to a simulation optimization design method and system for a stay cable tower top hanging bracket. According to the scheme, the corresponding finite element model is established firstly, then different working conditions are set according to actual conditions, the dynamic load is determined based on historical hoisting parameters under different working conditions and applied to the corresponding node for simulation finite element analysis and calculation, and finally the envelope value is extracted for analysis and checking calculation. According to the scheme, the dynamic stress change condition in the stay cable hoisting process can be more accurately simulated, the force borne by the tower top hanging bracket, the generated deformation and the counter-acting force of the fulcrum can be accurately calculated, and the data of the whole process can be visually displayed, so that the simulation model better fits the actual working condition, and the simulation efficiency is improved. And a more reliable basis and firm and effective technical support and guarantee are provided for design, construction, safety evaluation and the like of the tower top hanging bracket.

Description

Technical Field

[0001] The present application relates to the technical field of simulation optimization design, and particularly relates to a simulation optimization design method and system for a cable-stayed cable tower top hanger. Background Art

[0002] During the installation and construction process of the cable-stayed cable, the tower top hanger bears many construction loads and the tensile force of the cable-stayed cable itself. If the stiffness of the hanger is insufficient, excessive deformation will occur when bearing the load, which will affect the installation accuracy of the cable-stayed cable, such as causing deviation in the anchorage position of the cable-stayed cable. At the same time, for the case where there are many compression members in the hanger on the tower structure, instability is likely to occur, such as the overturning of the overall structure or the local buckling of the members.

[0003] Traditional analysis methods simplify the force as a concentrated force or a uniformly distributed load, resulting in the distortion of the distribution of the support reaction force. The eccentric tension of the cable-stayed cable causes uneven support reaction forces. At the same time, the influences of the wind field, lifting dynamic loads, etc. in different situations are ignored, and the fatigue damage of dynamic loads such as lifting impact and wind vibration is not quantified, resulting in inaccurate results. Therefore, how to efficiently and accurately analyze the stability and deformation of the cable-stayed cable tower top hanger structure under different stress states to discover potential instability risk points and solve the problems that the hanger may collapse due to poor stability and rigidity during the construction process, endangering construction safety and quality, is a problem that needs to be considered and addressed before actual construction. Summary of the Invention

[0004] Based on this, in view of the above problems, the present application proposes a simulation optimization design method for a cable-stayed cable tower top hanger, aiming to accurately simulate the stress and deformation of each component unit of the tower top hanger during the cable-stayed cable hoisting process, so as to provide a scientific basis for the design and optimization of the current hanger structure and ensure the safety of subsequent projects.

[0005] On the one hand, the present application provides a simulation optimization design method for a cable-stayed cable tower top hanger, and the method includes: Establish a three-dimensional finite element model of the tower top hanger according to the current design of the tower top hanger; Set different working conditions and determine the static loads of each component node under different working conditions; Determine the hoisting dynamic loads of the cable-stayed cable - hanger coupling interface nodes under each working condition according to historical hoisting data; Apply the static load and the hoisting dynamic load to each node for simulation finite element analysis and calculation to obtain the calculation results of the tower top hanger under each working condition; Extract the envelope values of the simulation results under each working condition to obtain the combined stress of the tower top hanger, the deformation results of each part, and the support reaction forces of each support point, and generate corresponding cloud map data; Check the rationality of the current design of the tower top hanger based on the simulation results and optimize and determine the corresponding component selection.

[0006] Furthermore, the method further includes: Setting working conditions corresponding to a variety of different lifting and installation operations of the stay cables with the first wind load superimposed, and the working condition of the tower top hanger with the second wind load superimposed in the non-working state; Among them, the first wind load is less than the second wind load.

[0007] Preferably, the method further includes: Dividing the hoisting process of the stay cables into multiple stages for simulation; Determining the dynamic loads at each stage under the current working condition based on historical hoisting data, and applying the dynamic loads to the coupling interface nodes; Obtaining the loads, deformations and support reactions of the hanger under the current working condition according to the interface iterative coupling operation.

[0008] Furthermore, obtaining the loads, deformations and support reactions of the hanger under the current working condition according to the interface iterative coupling operation includes: Establishing a coupling solution model for the stay cable-hanger interface and initializing the interface coupling parameters; Determining the velocity and acceleration at the current time step t based on historical hoisting process data to obtain the current dynamic load F t : where ρ is the linear density of the stay cable, g is the acceleration due to gravity, L t , a t , v t are the current length, acceleration and velocity of the stay cable respectively, c is the damping coefficient, F w is the wind load tension compensation of the stay cable, and E, A, l, Δl are the elastic modulus, cross-sectional area, elastic deformation and initial length of the steel wire rope respectively; Under the action of the static load and the dynamic load F t superimposed at each node and the interface, solving the displacement and stress distribution of each component of the tower top hanger based on the finite element method, and extracting the displacement at the interface; Updating the elastic deformation amount Δl of the steel wire rope with the displacement at the interface; Judging whether the force at the interface converges. If so, calculating the forces, deformations of each beam element of the tower top hanger and the support reactions at each support at the current time step t; Updating the time step t = t + Δt, where Δt is the simulation time interval, until the simulation of the current working condition is completed.

[0009] Preferably, the method further includes: Calculating the boundary conditions at the bottom of the columns and diagonal braces of the tower top hanger and the support positions on the side walls of the tower crown as fixed connections; The remaining members are simulated and calculated according to the corresponding unit cross-section material conditions of the beam element members based on the space structure model.

[0010] Preferably, the method further includes: Calculating the shear resistance value N of each high-strength bolt according to the current tower top hanger; v , the local bearing capacity N c and the local bearing capacity N of the climbing cone l ; Based on the reaction forces of each support point of the tower top hanger, extracting the maximum shear force V and normal pressure U of the embedded parts of the diagonal members; Judging whether the shear resistance value of each high-strength bolt, the local bearing capacity and the local bearing capacity of the climbing cone of the current selection are greater than max(V, U) / N, where N is the number of climbing cones; If not, adjust the selection and / or design of the current high-strength bolt and / or climbing cone.

[0011] Preferably, the method further includes: Extracting the maximum hoisting load under each working condition, and determining the pulling force S of the heavy equipment hoisting rope head according to the maximum load: where k is the number of guiding pulleys, n is the number of working ropes of the pulley block, Gm is the maximum hoisting load, and f is the rotational resistance coefficient of a single pulley; Determining the types of the hoisting winch and wire rope of the tower top gantry according to the pulling force of the rope head.

[0012] The second aspect of the present application provides a simulation and optimization design system for a cable-stayed cable tower top hanger, and the system includes: A model construction unit for establishing a three-dimensional finite element model of the tower top hanger according to the current tower top hanger design; A working condition setting unit for setting different working conditions and determining the static loads of each component node under different working conditions; A simulation and simulation unit for determining the hoisting dynamic load of the cable-stayed cable-hanger coupling interface node under each working condition according to historical hoisting data; and applying the static load and the hoisting dynamic load to each node for simulation finite element analysis and calculation to obtain the calculation results of the tower top hanger under each working condition; A data extraction unit for extracting the envelope value of the calculation results under each working condition to obtain the combined stress of the tower top hanger, the deformation results of each part and the reaction forces of each support point, and generating corresponding cloud map data; A checking and optimizing unit for checking the rationality of the current tower top hanger design based on the simulation results and optimizing and determining the selection of the corresponding components.

[0013] In a third aspect of the present application, a computer-readable storage medium is provided, storing a computer program, which, when executed by a processor, causes the processor to execute the steps of the method described in any one of the above.

[0014] In a fourth aspect of the present application, a computer terminal device is provided, including a memory and a processor. The memory stores a computer program, which, when executed by the processor, causes the processor to execute the steps of the method described in any one of the above.

[0015] The solution provided above in the present application first establishes a corresponding finite element model, then sets different working conditions according to the actual situation, determines the dynamic load based on the historical hoisting parameters under different working conditions, and applies it to the corresponding nodes for simulation finite element analysis and calculation. Finally, the envelope value is extracted for analysis and verification. The solution of the present application can more accurately simulate the dynamic force change situation during the cable-stayed cable hoisting process, accurately calculate the force borne by the tower top hanger, the deformation generated, and the reaction force of the fulcrum, and can intuitively display the data of the entire process, making the simulation model more in line with the actual working conditions, and providing a more reliable basis, a solid and effective technical support and guarantee for the design, construction and safety assessment of the tower top hanger.

[0016] Furthermore, the solution of the present application also defines interface coupling, comprehensively considers the interaction and influence between the cable-stayed cable and the hanger winch, realizes the effective determination of data interaction and collaborative work between the cable-stayed cable and the hanger at the interface node, and comprehensively considers the influence of dynamic response on the structural force in the analysis of the tower top hanger. Further, through interface coupling iterative operation, the structural force state and dynamic response are updated in each iteration, making the calculation result closer to the real situation, thereby improving the accuracy of the calculation result. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Among them: Figure 1 is a flowchart of the simulation optimization design method for the cable-stayed cable tower top hanger in one embodiment; Figure 2 is a schematic diagram of the finite element model of the tower top hanger established in one embodiment; Figure 3 is a schematic diagram of the result of extracting the combined stress envelope value of the tower top hanger in one embodiment; Figure 4Schematic diagram of the result of extracting the deformation envelope value of the top tower hanger in an embodiment; Figure 5 Schematic diagram of the result of extracting the reaction force envelope value of the fulcrum of the top tower hanger in an embodiment; Figure 6 Structural block diagram of the simulation optimization design system of the cable-stayed top tower hanger in an embodiment; Figure 7 Structural block diagram of a computer device in an embodiment. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0020] The terms "including", "comprising" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices. The relational terms such as "first" and "second" in the claims, specification and drawings of this application are only used to distinguish one entity / operation / object from another entity / operation / object, and do not necessarily require or imply any such actual relationship or order between these entities / operations / objects.

[0021] Referring to "embodiment" herein means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of this application. The phrase does not necessarily refer to the same embodiment each time it appears in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0022] It should be noted that the steps shown in the flowchart of the drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0023] In one embodiment, as Figure 1As shown in the figure, it is a flowchart of a simulation optimization design method for a cable-stayed cable tower top hanger of the present application. The method includes: S10. Establish a three-dimensional finite element model of the tower top hanger according to the current design of the tower top hanger.

[0024] Specifically, based on the design of the actual tower top hanger or detailed structure drawings, finite element software such as Midas / civil, Ansys, Abaqus, etc. is used to model and analyze the tower top hanger. When modeling, ensure that the key geometric parameters such as the length, cross-sectional shape, angle, and mutual connection position of each beam element are consistent with the actual situation. For some complex node structures, such as the intersection between beam elements and the anchorage part of the beam and the stay cable, a higher-precision modeling method is adopted, such as solid modeling or polyhedral mesh division, to avoid errors caused by geometric simplification. After the model is established, determine its material parameters according to the materials actually used for the tower top hanger, such as basic mechanical property parameters such as elastic modulus, Poisson's ratio, and density. If the hanger structure involves multiple different materials, accurately assign the corresponding material properties to each part to ensure that the model can truly reflect the response characteristics of the structure under stress. Furthermore, reasonably set the boundary conditions. For example, the part fixedly connected to the tower top can be set as a fixed constraint to restrict its translational and rotational motions in the corresponding directions; for connection points with a certain degree of freedom but also limited, they can be set as corresponding hinge support and other constraint forms to simulate the actual force transfer boundary conditions.

[0025] During the simulation calculation, the boundary conditions at the bottom of the columns, diagonal braces, and the support positions on the side walls of the tower crown are calculated as fixed, and the remaining members are all established as a spatial structure model according to the beam element members. All types of beam elements are simulated and calculated according to the actual element cross-section and material conditions to truthfully reflect the stress state of the structure. As Figure 2 shown, in an embodiment of the present application, a finite element calculation model of a tower top hanger established according to the design structure by finite element software.

[0026] S11. Set different working conditions and determine the static loads of each component node under different working conditions; Specifically, for the designed tower top hanger, according to the actual situation during the hoisting process, set a variety of working conditions for simulation, including hoisting working conditions and non-hoisting operation working conditions (bearing loads caused by severe weather). For example: set working conditions corresponding to multiple different lifting and installation operations of the stay cable with the first wind load superimposed, and working conditions of the tower top hanger with the second wind load superimposed in the non-working state, where the first wind load is less than the second wind load. Preferably, in an embodiment, to truthfully reflect the actual operating conditions, the present application sets the following several working conditions for simulation and verification according to the actual construction situation: Condition 1: Installation of stay cables by hoisting 1 - Loading on the main lifting points on both sides, located outside the crossbeam, considering the self-weight of the structure, dynamic hoisting loads, and wind loads of Grade 5 - 7. Condition 2: Installation of stay cables by hoisting 2 - Loading on the main lifting points on both sides of one side, located outside the crossbeam, considering the self-weight of the structure, dynamic hoisting loads, and wind loads of Grade 5 - 7. Condition 3: Installation of stay cables by hoisting 3 - Loading on the main lifting point on one side of one side, located outside the crossbeam, considering the self-weight of the structure, dynamic hoisting loads, and wind loads of Grade 5 - 7. Condition 4: Installation of stay cables by hoisting 4 - Loading on the main lifting points on both sides of one side, located inside the crossbeam, considering the self-weight of the structure, dynamic hoisting loads, and wind loads of Grade 5 - 7. Condition 5: Wind loads in non-operating state - Considering the self-weight of the structure and wind loads above Grade 10.

[0027] Among them, the static load of each component node is the relatively stable load borne by the tower top hanger under the corresponding condition, including the self-weight of the component structure and the simulated wind load of the current condition. The determination of the wind load includes: determining the equivalent wind speed Vg according to the preset wind force level, and then determining the wind load according to the equivalent wind speed: Among them, ρ a is the air density, generally taking a value of 1.25 kg / m³, η is the shielding coefficient, C is the wind load resistance coefficient, taking a value of 1.9, D is the windward area, which is determined according to the specific situation of the component. When the wind force level is determined, the wind loads received by each component during simulation are relatively stable.

[0028] S12. Determine the stay cable - hanger coupling interface nodes, determine the dynamic hoisting loads of the coupling interface nodes under each condition according to the historical hoisting parameters, and apply the static load and dynamic hoisting loads to each node for simulation finite element analysis and calculation to obtain the calculation results of the tower top hanger under each condition.

[0029] In the cable-stayed cable hoisting project, the winch serves as the power source to provide pulling force, and the tower top hanger undertakes the task of transmitting the pulling force to the tower top and dispersing it to each support point. In order to accurately simulate the force-bearing situation of the winch and the mechanical response of the sub-structure of the tower top hanger, this application regards the winch and the tower top hanger as an interrelated system through the coupling interface. This application determines the connection point between the winch and the tower top hanger through the steel wire rope as the cable-stayed cable - hanger coupling interface node. The number of this coupling interface nodes can be determined according to the number of winches or working conditions under different working conditions, and the interface relationship is defined according to the actual situation (for example, in some cases, the winch steel wire rope is connected to the hanger through a fixed pulley), so as to realize the transmission and mutual influence of force. The coupling operation at the interface can comprehensively consider the dynamic pulling force change of the winch and the structural deformation of the tower top hanger on each other, so as to more realistically reflect the mechanical behavior in the whole hoisting process.

[0030] After setting different working conditions, in the hoisting process of different working conditions of this application scheme, according to the actual hoisting requirements and hoisting parameters (speed, acceleration), the dynamic influence of the simulated system under different loads is simulated to accurately simulate and reflect the force-bearing situation of the system and check the rationality of the current design.

[0031] Furthermore, this application scheme determines the hoisting parameters in combination with the historical data and requirements of the historical hoisting process, calculates and determines the simulated dynamic load according to the historical hoisting parameters under different working conditions, and applies the dynamic load to the corresponding nodes for simulation finite element analysis and calculation to obtain the calculation results of the tower top hanger under each working condition. Specifically, it includes: S121. Divide the cable-stayed cable hoisting process into multiple stages for simulation.

[0032] In one embodiment, this application scheme divides the winch hoisting the cable-stayed cable into three main stages: the starting stage, the uniform lifting stage, and the positioning stage for simulation and determines the corresponding parameters. Starting stage: In this stage, the pulling force needs to overcome the self-weight of the sling, the self-weight of the cable-stayed cable, and the initial friction force of the connecting components, etc. to hoist the cable-stayed cable at an accelerated speed; Uniform lifting stage: The pulling force remains relatively stable, and the cable-stayed cable is lifted uniformly; Positioning stage: When approaching the preset installation position, the winch starts to decelerate.

[0033] S122. Determine the dynamic load at each simulation time step under the current working condition based on the historical hoisting data, and apply the dynamic load to the corresponding coupling interface nodes.

[0034] Specifically, based on historical hoisting data, hoisting parameters (such as speed, acceleration, etc.) at each stage of the current working condition are determined. Then, based on the hoisting parameters, dynamic loads at each simulation time step are determined, and the dynamic loads are applied to the corresponding coupling interface nodes. During the simulation, the hoisting process parameters corresponding to the actual time are mapped to the corresponding simulation time steps. For example, according to the accuracy of the simulation and computing resources, the proportional relationship between the actual time and the simulation time steps is determined, and a mapping table is created to associate the actual time points with the corresponding simulation time steps. The mapping table should contain sufficient time points to ensure that all key stages of the hoisting process can be accurately simulated.

[0035] S123. Obtain the load, deformation, and support reaction force of the hanger under the current working condition according to the interface iterative coupling operation.

[0036] The basic principle and idea of the iterative coupling operation in this application are as follows: According to the dynamic load of the winch, the force condition of the tower top hanger at the interface is calculated, and then the deformation and stress distribution of the tower top hanger are obtained. Then, the deformation information of the tower top hanger is fed back to the winch - wire rope, and then the force condition of the winch is updated, and the response of the tower top hanger is calculated again. This process is repeated iteratively until the force conditions and deformation states of the tower top hanger and the winch reach convergence. During the iterative process, numerical calculation methods, such as the finite element method, the finite difference method, etc., can be used to discretize the structure of the tower top hanger and solve its mechanical equations. Further, the obtaining the load, deformation, and support reaction force of the hanger under the current working condition according to the interface iterative coupling operation includes: S1231. Establish a cable - hanger interface coupling solution model and initialize the interface coupling parameters.

[0037] Specifically, the interface coupling solution model is established based on the force balance condition and the displacement coordination condition. Among them, the force balance condition is: the tension provided by the winch is equal to the force received by the tower top hanger at the interface; the displacement and deformation coordination condition is: the transient displacement u of the tower top interface node f will be transmitted to the wire rope through inertial force or elastic waves, causing dynamic elastic deformation Δl.

[0038] After establishing the solution model, initialize the interface coupling parameters: the initial displacement u of the tower top hanger f = 0, and the initial stress is 0.

[0039] S1232. Determine the speed and acceleration at the current time step t based on the historical hoisting process data to obtain the current dynamic load F t : Among them, ρ is the linear density of the stay cable, g is the acceleration due to gravity, L t 、a t 、vt are the current length, acceleration, and velocity of the stay cable respectively, c is the damping coefficient, and F w is the wind load tension compensation for the stay cable. This tension compensation F w can be simulated and quantified by combining historical data and / or data such as wind force level and hoisting length. E, A, l, and Δl are the elastic modulus, cross-sectional area, elastic deformation, and initial length of the wire rope respectively. Further, when specifically determining the quantification of the dynamic load, the hoisting angle parameter can also be considered for optimization according to the actual situation or need.

[0040] S1233. Solve the displacements and stress distributions of each component of the tower top hanger at each node under the preset wind load, self-gravity, and the dynamic load Ft at the interface node based on the finite element method, and extract the displacement at the interface.

[0041] Specifically, assume that the tower top hanger consists of n beam elements. For the i-th beam element, its stiffness matrix is [Ki], the node displacement vector is {ui}, and the node force vector is {Fi}. Then {Fi} = [Ki]{ui}, where the node force vector {Fi} contains the self-gravity and external force information (wind load) acting on all nodes of the structure. These external forces can be concentrated forces directly applied to the nodes or forces obtained by integrating distributed forces equivalent to the nodes. For the nodes at the interface, in addition to self-gravity and wind load, they also include the current dynamic load Ft.

[0042] Assemble the stiffness matrices of all beam elements into the global stiffness matrix [K], the node displacement vectors into {u}, and the node force vectors into {F}, where the node force at the interface is also superimposed with F t , solve the equation system [K]{u} = {F} according to the boundary conditions to obtain the node displacement vector {u}, and then obtain the displacement u at the interface f .

[0043] Preferably, in this application, the stiffness matrices of all beam elements are assembled into the global stiffness matrix [K] according to the node numbers and topological relationships. Specifically, the elements of each unit stiffness matrix are superimposed on the corresponding positions of the global stiffness matrix. For example, if unit 1 connects node 1 and node 2, the elements of unit 1 stiffness matrix related to the degrees of freedom of node 1 and node 2 will be superimposed on the corresponding positions in the global stiffness matrix. When assembling the global stiffness matrix, the boundary conditions are further considered. For the fixed end, the corresponding degrees of freedom need to be processed in the global stiffness matrix, and the rows and columns corresponding to these degrees of freedom are modified to meet the constraint conditions of the fixed end. For example, if node 1 is a fixed end, in the rows and columns of the global stiffness matrix related to the degrees of freedom of node 1, except for the diagonal elements, the remaining elements are set to 0, and the diagonal element is set to a very large number.

[0044] S1234. Update the elastic deformation Δl of the wire rope by feeding back the interface displacement.

[0045] Specifically, under dynamic conditions (such as lifting, braking, wind vibration, etc.), the transient displacement u of the tower top interface node is f It will be transmitted to the wire rope through inertial force or elastic wave, causing dynamic elastic deformation Δl. According to the deformation coordination principle, in order to maintain the geometric continuity of the system, the displacement of the wire rope and the tower top interface node meets the coordination condition. For example, if the tower top node undergoes a vertical displacement u z , the length of the wire rope is adjusted accordingly to maintain the continuity of the connection point. This deformation coordination is the basis for the stable operation of the system. The specific interface displacement feedback elastic deformation Δl can be characterized by a simplified engineering model: Within the elastic range, if the top interface displacement u f Much smaller than the structure size, the higher-order terms can be ignored, and Δl is approximated as a linear function of the node displacement: Δl≈α⋅u f (α is the geometric coefficient), for example, the vertical displacement u of the tower top z The relationship with the elongation of the wire rope can be simplified as: Δl=u z / sinθ, when the inclination angle θ of the wire rope is small, sinθ is approximately a constant. The wire rope elastic stiffness EA / L0 can also be converted to the tower top node by the equivalent stiffness method to form the equivalent stiffness K eq , then, according to the node displacement u f Calculate the equivalent deformation of the wire rope: .

[0046] S1235. Determine whether the force at the interface is converged. If so, calculate the force, deformation and reaction force of each beam unit of the tower top hanger at the current time step t.

[0047] Due to the dynamic load F t The top of the tower is displaced, causing Δl to change and thus causing F t Changes again, therefore, this application determines whether the current convergence is achieved by updating and iterating to determine whether Δl is less than the preset error threshold each time. If not, the Ft at the current time step is updated and iterated, and returns to S1132 for iterative calculation until Δl is less than the preset error threshold, that is, the force at the current time step is stable and the simulation tends to be stable. If convergence is satisfied, the force, deformation and reaction force of each beam unit of the tower top hanger at the current time step t are calculated, including: Finite element simulation calculations are performed on each beam unit. Based on the calculation results of the finite element simulation software, force information such as axial force N, shear force Q and bending moment M, as well as deformation information such as displacement u and rotation angle can be extracted.

[0048] The reaction force at the fulcrum can be obtained by solving the equilibrium equation. According to the reaction force calculation principle: in finite element analysis, the reaction force result at the fulcrum is obtained by solving the equilibrium equation of the structure. Therefore, in one embodiment of the present application, when solving the reaction force at the fulcrum of a complex tower top hanger composed of multiple rods, the forces and moments of each fulcrum are summarized and calculated according to the equilibrium equation at the fulcrum connected to the tower top to obtain the specific values of the reaction forces in each direction.

[0049] Specifically, the tower top hanger is regarded as a statically determinate structure hanger structure space, and the force balance equation is established at the fixed end support point. , and combined with the moment balance equations about the x, y, and z directions: By combining these equations, we can solve all the support reaction force components and calculate the support reaction force components Rx, Ry, and Rz along the x, y, and z directions respectively, and then get the reaction force of each support.

[0050] S1236, updating the time step t=t+Δt, where Δt is the simulation time interval, until the simulation under the current working condition is completed.

[0051] Specifically, the continuous time process is discretized into a series of time steps t0, t1, …, tn, and each step interval Δt is set. In each time step, the force balance and geometric update of the tower crane system are iteratively solved to simulate the elastic deformation of the wire rope and the displacement of the tower top during the lifting process until the simulation of the current working condition is completed.

[0052] The above-mentioned solution provided in the present application sets up an interface coupling model, comprehensively considers the interaction and influence between the inclined cable and the hanger winch, and realizes the effective determination of the data interaction and collaborative work between the inclined cable and the hanger at the interface node. In the analysis of the tower top hanger, the influence of the dynamic response on the structural force is comprehensively considered. Through the interface coupling iterative operation, the structural force state and dynamic response are updated in each iteration, and the corresponding parameters are dynamically corrected, so that the calculation results are closer to the actual situation, thereby improving the accuracy of the calculation results.

[0053] S13. Extract the envelope value of the calculation results under each working condition to obtain the combined stress of the tower top hanger, the deformation results of each part and the reaction force of each support point, and generate corresponding cloud map data.

[0054] Specifically, through the post-processing module of the finite element software, the stress calculation results of each part of the tower top hanger under each working condition are extracted. For example, by searching for the stress and deformation values of each node and each element in the software, the maximum and minimum values are found. The maximum value is the maximum positive stress, deformation, and reaction force in the positive envelope value, and the minimum value may be the maximum negative value. Combining them gives the envelope value range. And by drawing internal force and deformation nephograms, generating internal force numerical diagrams, etc., the force magnitudes and change trends of each part are visually presented, the key components with larger forces and the distribution of dangerous sections are determined, and whether they exceed the allowable stress and allowable deformation of the material is analyzed. If they exceed, the structure needs to be optimized, such as adjusting the cross-sectional dimensions of the members, changing the structure form, etc., to ensure the safety of the structure during the installation of the stay cables.

[0055] Such as Figures 3 - 5 shown are respectively the envelope results of the combined stress (unit: MPa), deformation (unit: mm), and hanger support reaction force (unit: KN) of the tower top hanger under each working condition extracted according to the simulation results, and the result schematic diagrams of the corresponding nephogram data generated therefrom.

[0056] S14. Check the rationality of the current tower top hanger design based on the simulation calculation results and optimize and determine the selection of the corresponding components.

[0057] Specifically, compare the stress, strain, deformation, etc. results of each part of the hanger obtained from the simulation analysis under different working conditions with the allowable values in the specification standards to check whether the current components meet the strength requirements, stiffness requirements (such as whether the maximum displacement is within the allowable deformation range), and stability requirements (such as whether the overall stability coefficient of the structure meets the regulations), etc., and then determine the rationality of the current tower top hanger design and the selection of the corresponding components.

[0058] The support mainly relies on the diagonal bracing to be anchored on the outer wall of the tower through the embedded parts. The embedded parts are composed of embedded bolts, climbing cone cones, and high-strength bolts. Preferably, in one embodiment, the checking and optimization of the rationality of the current tower top hanger design in this application include the stability and rationality of the current designed diagonal bracing embedded component, specifically including: Calculate the shear resistance value N of each high-strength bolt according to the current tower top hanger v , the local bearing capacity N c and the local bearing capacity N of the climbing cone cone l : n v is the number of shear surfaces, d is the bolt rod diameter, f v is the design shear strength value of the bolt, f c is the design local bearing strength value of the bolt, f l is the concrete axial compressive strength, β cis the concrete strength influence coefficient, β l is the strength increase coefficient of the concrete under local compression, A is the net area of the local compression of the concrete; Based on the reaction forces of each support point of the tower top hanger, extract the maximum shear force V and normal pressure N of the diagonal bar embedded parts; Judge whether the shear resistance value and local bearing capacity of each high-strength bolt in the current selection are greater than max(V, N); If not, adjust the selection and / or design of the current high-strength bolts and / or climbing cones.

[0059] In another embodiment, the solution of the present application optimizes and determines the selection of each component, including the selection of the winch and wire rope: Extract the maximum hoisting load under each working condition, and determine the pulling force S of the heavy equipment hoisting rope head according to the maximum load: where k is the number of guiding pulleys, n is the number of working ropes of the pulley block, Gm is the maximum hoisting load, and f is the rotational resistance coefficient of a single pulley; According to the pulling force of the rope head, determine the types of the winch and wire rope for the tower top gantry hoisting.

[0060] For example, in one embodiment, according to the extracted maximum hoisting load Gm = 432.82 KN, the rotational resistance coefficient f of a single pulley = 1.04, the number of guiding pulleys k = 2, and the number of working ropes of the pulley block n = 6, the pulling force value S of the rope head can be calculated as 85.9 KN. Furthermore, according to this pulling force of the rope head and combined with the current construction requirements, it can be determined to select a 10-ton winch as the winch for the tower top gantry, and the wire rope is selected as a galvanized wire rope (6×37) with a diameter of Φ30 mm, and its breaking tensile force is 526 KN (nominal tensile strength 1770 MPa), and the safety factor K = 526 / 85.9 = 6.13 > 5 (construction safety requirements) to ensure the safety of subsequent actual construction.

[0061] The above solution of the present application can more accurately simulate the dynamic force change situation during the cable-stayed cable hoisting process, accurately calculate the forces borne by the tower top hanger, the deformations generated, and the reaction forces of the support points, and can visually display the data of the entire process, making the simulation model more in line with the actual working conditions, and providing a more reliable basis, a solid and effective technical support and guarantee for the design, construction and safety assessment of the tower top hanger.

[0062] In one embodiment, as Figure 6 shown, the present application further provides a simulation and optimization design system for a cable-stayed cable tower top hanger, and the system includes: A model construction unit for establishing a three-dimensional finite element model of the tower top hanger according to the current design of the tower top hanger; The working condition setting unit is used to set different working conditions and determine the static loads of each component node under different working conditions; The simulation unit is used to determine the cable-stayed cable-hanger coupling interface node, and determine the hoisting dynamic load of the coupling interface node under each working condition according to historical hoisting parameters; and apply the static load and the hoisting dynamic load to each node to perform simulation finite element analysis and calculation, and obtain the calculation results of the tower top hanger under each working condition; The data extraction unit is used to extract the envelope value of the calculation results under each working condition to obtain the combined stress of the tower top hanger, the deformation results of each part and the reaction force of each support point, and generate the corresponding cloud map data; The checking and optimizing unit is used to check the rationality of the current tower top hanger design based on the simulation results and optimize and determine the corresponding component selection.

[0063] In one embodiment, as Figure 7 shown, the present application further provides a computer device, including a memory and a processor. The memory stores a computer program. When the computer program is executed by the processor, the processor executes the above method steps.

[0064] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to the memory, storage, database or other media used in the embodiments provided by the present application can include non-volatile and / or volatile memories. The non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. The volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0065] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0066] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A simulation optimization design method for the cable-stayed cable tower top hanger, characterized in that, The method includes: Establish a three-dimensional finite element model of the top tower hanger according to the current design of the top tower hanger; Set different working conditions and determine the static loads of each component node under different working conditions; Determine the lifting dynamic loads of the cable-stayed cable-hanger coupling interface nodes under each working condition according to historical lifting data; Apply the static loads and lifting dynamic loads to each node for finite element simulation analysis and calculation to obtain the calculation results of the top tower hanger under each working condition; Extract the envelope values of the simulation results under each working condition to obtain the combined stress of the top tower hanger, the deformation results of each part, and the reaction forces of each support point, and generate corresponding contour data; Based on the simulation results, check the rationality of the current design of the top tower hanger and optimize and determine the corresponding component selection.

2. The method according to claim 1, wherein The method further includes: Set the working conditions corresponding to the superposition of the first wind load under various different lifting and installation operations of the cable-stayed cable, and the working conditions corresponding to the superposition of the second wind load when the top tower hanger is in the non-working state; Wherein, the first wind load is less than the second wind load.

3. The method according to claim 1, wherein The method includes: Divide the cable-stayed cable lifting process into multiple stages for simulation; Determine the dynamic loads at each simulation time step under the current working condition based on historical lifting data, and apply the dynamic loads to the corresponding coupling interface nodes; Obtain the loads, deformations, and support reaction forces of the hanger under the current working condition according to the interface iterative coupling operation.

4. The method according to claim 3, wherein The obtaining of the loads, deformations, and support reaction forces of the hanger under the current working condition according to the interface iterative coupling operation includes: Establish a cable-stayed cable-hanger interface coupling solution model and initialize the interface coupling parameters; Determine the velocity and acceleration at the current time step \(t\) based on historical hoisting process data, and obtain the current dynamic load \(F\) t : where ρ is the linear density of the stay cable, g is the acceleration due to gravity, and L t , a t , v t are the current length, acceleration, and velocity of the stay cable respectively, c is the damping coefficient, and F w is the wind load tension compensation of the stay cable. E, A, l, and Δl are the elastic modulus, cross-sectional area, elastic deformation, and initial length of the steel wire rope respectively; Each node superimposes the dynamic load F at the static load and the interface t Under the action, the displacements and stress distributions of each component of the tower top hanger are solved based on the finite element method, and the displacements at the interfaces are extracted; Update the elastic deformation amount Δl of the steel wire rope by the displacement at the interface; Judge whether the force at the interface converges. If so, calculate the forces, deformations, and support reaction forces of each beam element of the top tower hanger at the current time step t; Update the time step t=t+Δt, where Δt is the simulation time interval, until the simulation of the current working condition is completed.

5. The method according to claim 1, wherein The method further includes: Calculate the boundary conditions at the column bottom, diagonal brace bottom of the top tower hanger, and the support position of the tower crown side wall according to consolidation; Simulate and calculate the remaining members according to the unit cross-section material conditions corresponding to the beam element members of the space structure model.

6. The method according to claim 1, characterized in that The method further includes: Calculate the shear resistance value N of each high-strength bolt according to the current tower top hanger v , local bearing capacity N c and the local bearing capacity N of the climbing cone l ; Based on the reaction forces of each support point of the top tower hanger, extract the maximum shear force V and normal pressure U of the diagonal bar embedded parts; Judge the shear resistance value N of each high-strength bolt for the current selection v , the bearing capacity of local bearing pressure N c and the local bearing capacity N of the climbing cone l Whether it is greater than max(V, U) / N, where N is the number of climbing cones; If not greater than, then adjust the selection and / or design of the current high-strength bolts and / or climbing cones.

7. The method according to any one of claims 1 to 6, characterized in that, The method further includes: Extract the maximum lifting load under each working condition, and determine the pulling force S of the heavy equipment lifting rope head according to the maximum load: Where k is the number of guiding pulleys, n is the number of working ropes of the pulley block, Gm is the maximum lifting load, and f is the rotational resistance coefficient of a single pulley; Determine the types of the lifting winch and steel wire rope of the top tower gantry according to the pulling force of the rope head.

8. A simulation optimization design system for the cable-stayed cable tower top hanger, characterized in that The system includes: A model construction unit for establishing a three-dimensional finite element model of the top tower hanger according to the current design of the top tower hanger; A working condition setting unit for setting different working conditions and determining the static loads of each component node under different working conditions; The simulation unit is used to determine the hoisting dynamic loads of the cable-stayed cable-hanger coupling interface nodes under various working conditions according to historical hoisting data; and apply the static loads and hoisting dynamic loads to each node for simulation finite element analysis and calculation to obtain the calculation results of the tower top hanger under various working conditions; The data extraction unit is used to extract the envelope values of the simulation results under various working conditions to obtain the combined stress of the tower top hanger, the deformation results of each part and the reaction forces of each fulcrum, and generate the corresponding cloud map data; The checking and optimization unit is used to check the rationality of the current tower top hanger design based on the simulation results and optimize and determine the corresponding component selection.

9. A computer-readable storage medium storing a computer program, which when executed by a processor causes the processor to execute the steps of the method according to any one of claims 1 to 7.

10. A computer device comprising a memory and a processor, the memory storing a computer program, which when executed by the processor causes the processor to execute the steps of the method according to any one of claims 1 to 7.

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