A simulation optimization design method and system for the top hanger of a cable tower

Abstract

The present application relates to the technical field of simulation optimization design, and specifically to a simulation optimization design method and system for a cable-stayed tower top hanger. The present application scheme first establishes a corresponding finite element model, and then sets different working conditions according to actual conditions, and determines the dynamic load based on the historical lifting parameters under different working conditions, applies it to the corresponding nodes for simulation finite element analysis and calculation, and finally extracts the envelope value for analysis and verification. The present application scheme can more accurately simulate the dynamic force changes during the cable-stayed hoisting process, accurately calculate the force borne by the tower top hanger, the deformation generated, and the reaction force of the support, and can intuitively display the entire process data, so that the simulation model is more in line with the actual working conditions, and provide a more reliable basis, solid and effective technical support and guarantee for the design, construction and safety assessment of the tower top hanger.

Description

Technical Field

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

[0002] During the installation of the stay cables, the tower-top hanger bears numerous construction loads as well as the cable's own tension and other forces. If the hanger is not rigid enough, it will deform significantly when bearing the load, which will affect the accuracy of the cable installation, such as causing deviations in the cable anchoring position. Furthermore, if the hanger on a tower structure has a large number of compressive members, instability is likely to occur, such as overturning of the entire structure or local buckling of the members.

[0003] Traditional analysis methods simplify the forces to concentrated forces or uniformly distributed loads, resulting in distorted support reaction force distribution and uneven support reaction forces caused by eccentric tensioning of the cable stays. Furthermore, the effects of wind gusts and dynamic hoisting loads under different conditions are ignored, and fatigue damage from dynamic loads such as hoisting impact and wind vibration is not quantified, leading to inaccurate results. Therefore, how to efficiently and accurately analyze the stability and deformation of the cable tower top hanger structure under different stress states to identify potential instability risks and address the potential collapse of the hanger during construction due to poor stability and rigidity, which could endanger construction safety and quality, is an issue that needs to be considered and addressed before actual construction. Summary of the Invention

[0004] Based on this, this application proposes a method for optimizing the design of the top hanger of the cable-stayed tower to address the above-mentioned problems, aiming to accurately simulate the stress and deformation of each component unit of the tower top hanger during the installation of the cable-stayed tower, 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 one hand, the present application provides a simulation optimization design method for a stay cable tower top hanger, the method comprising:

[0006] Establishing a three-dimensional finite element model of the tower top hanger according to the current tower top hanger design;

[0007] Set different working conditions and determine the static load of each component node under different working conditions;

[0008] Determine the dynamic load of the cable-hanger coupling interface node under each working condition based on historical lifting data;

[0009] Apply the static load and the dynamic load of hoisting to each node to perform simulation finite element analysis calculation to obtain the calculation results under various working conditions of the tower top hanger;

[0010] Extract the envelope value 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 reaction force of each support point, and generate the corresponding cloud map data;

[0011] Based on the simulation results, the rationality of the current tower top hanger design is verified and the corresponding component selection is optimized.

[0012] Furthermore, the method further comprises:

[0013] Setting the working conditions of the stay cable under various lifting and installation operations corresponding to the superposition of the first wind load, and the working conditions of the tower top hanger under the non-working state corresponding to the superposition of the second wind load;

[0014] Wherein, the first wind load is smaller than the second wind load.

[0015] Preferably, the method further comprises:

[0016] Divide the stay cable hoisting process into multiple stages for simulation;

[0017] Determine the dynamic loads at each stage under the current working condition based on historical lifting data, and apply the dynamic loads to the coupling interface nodes;

[0018] The load, deformation and support reaction force of the hanger under the current working condition are obtained according to the interface iterative coupling operation.

[0019] Furthermore, the load, deformation and support reaction force of the hanger under the current working condition are obtained according to the interface iterative coupling operation, including:

[0020] Establish a cable-hanger interface coupling solution model and initialize the interface coupling parameters;

[0021] Based on the historical lifting process data, the velocity and acceleration at the current time step t are determined to obtain the current dynamic load F t :

[0022]

[0023] Where ρ is the linear density of the cable, g is the acceleration of gravity, L t 、a t 、v t are the current cable length, acceleration, and velocity, c is the damping coefficient, and F w is the compensation for the wind load tension of the cable, E, A, l, and Δl are the elastic modulus, cross-sectional area, elastic deformation, and initial length of the wire rope, respectively;

[0024] Each node is subjected to static load and dynamic load F at the interface. t Under the action of gravity, the displacement and stress distribution of each component of the tower top hanger are solved based on the finite element method, and the displacement at the interface is extracted;

[0025] The displacement at the interface is updated with the elastic deformation of the wire rope Δl;

[0026] Determine whether the force at the interface is convergent. If so, calculate the force, deformation and support reaction of each beam unit of the tower top hanger at the current time step t;

[0027] Update the time step t=t+Δt, where Δt is the simulation time interval until the simulation under the current working condition is completed.

[0028] Preferably, the method further comprises:

[0029] The boundary conditions at the columns of the tower top hanger, the bottom of the diagonal brace and the supporting position of the tower crown side wall are calculated as consolidation;

[0030] The remaining members are simulated and calculated according to the spatial structure model and the unit section material conditions corresponding to the beam unit members.

[0031] Preferably, the method further comprises:

[0032] Calculate the shear value N of each high-strength bolt based on the current tower top hanger v , local compressive bearing capacity N c And the local compressive bearing capacity of the climbing cone N l ;

[0033] Based on the reaction forces of each support point of the tower top hanger, the maximum shear force V and normal pressure U of the diagonal rod embedded parts are extracted;

[0034] Determine whether the shear resistance, local bearing pressure capacity and local compressive bearing capacity of each high-strength bolt currently selected are greater than max(V, U) / N, where N is the number of climbing cones;

[0035] If not, adjust the current high-strength bolt and / or climbing cone selection and / or design.

[0036] Preferably, the method further comprises:

[0037] Extract the maximum hoisting load under each working condition and determine the rope tension S for heavy equipment hoisting based on the maximum load:

[0038]

[0039] Where k is the number of guide pulleys, n is the number of working ropes of the pulley group, Gm is the maximum hoisting load, and f is the rotation resistance coefficient of a single pulley;

[0040] Determine the type of tower top gantry hoisting winch and wire rope based on the rope head tension.

[0041] A second aspect of the present application provides a simulation optimization design system for a stay cable tower top hanger, the system comprising:

[0042] A model building unit, configured to build a three-dimensional finite element model of the tower top hanger according to the current tower top hanger design;

[0043] The working condition setting unit is used to set different working conditions and determine the static load of each component node under different working conditions;

[0044] A simulation unit is used to determine the dynamic load of the cable-hanger coupling interface node under each working condition based on historical lifting data; and to apply the static load and the dynamic load to each node to perform simulation finite element analysis and calculation to obtain the calculation results under each working condition of the tower top hanger;

[0045] The data extraction unit is used to extract the envelope value of the calculation results under various working conditions 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;

[0046] The verification and optimization unit is used to verify the rationality of the current tower top hanger design based on simulation results and optimize the selection of corresponding components.

[0047] In a third aspect, the present application provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the processor executes the steps of any one of the above methods.

[0048] A fourth aspect of the present application provides a computer terminal device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of any one of the above methods.

[0049] The solution provided in the present application first establishes a corresponding finite element model, then sets different working conditions according to actual conditions, determines dynamic loads based on historical lifting parameters under different working conditions, applies them to corresponding nodes for simulation finite element analysis, and finally extracts envelope values ​​for analysis and verification. The solution of this application can more accurately simulate the dynamic force changes during the lifting process of the inclined cable, accurately calculate the force borne by the tower top hanger, the deformation generated, and the reaction force of the support, and can intuitively display the entire process data, making the simulation model more in line with the actual working conditions, and providing a more reliable basis, solid and effective technical support and guarantee for the design, construction and safety assessment of the tower top hanger.

[0050] Furthermore, this application solution defines interface coupling, comprehensively considering the interactions and influences between the stay cables and the hanger winch. This allows for effective data exchange and collaborative work between the stay cables and the hanger at the interface nodes. In the analysis of the tower hanger, the impact of dynamic response on structural stress is comprehensively considered. Furthermore, through iterative calculations using interface coupling, the structural stress state and dynamic response are updated in each iteration, making the calculation results closer to reality and thus improving the accuracy of the results. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0052] in:

[0053] Figure 1 Flowchart of a simulation optimization design method for a stay cable tower top hanger in one embodiment;

[0054] Figure 2 Schematic diagram of a finite element model of a tower top hanger established in one embodiment;

[0055] Figure 3 A schematic diagram of the results of extracting the combined stress envelope value of the tower top hanger in one embodiment;

[0056] Figure 4 A schematic diagram of the result of extracting the deformation envelope value of the tower top hanger in one embodiment;

[0057] Figure 5 A schematic diagram of the result of extracting the reaction force envelope value of the tower top hanger support in one embodiment;

[0058] Figure 6 A structural block diagram of a simulation and optimization design system for a stay cable tower top hanger in one embodiment;

[0059] Figure 7 FIG. 1 is a structural block diagram of a computer device in one embodiment. DETAILED DESCRIPTION

[0060] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0061] The terms "include", "comprising", and "having", and any variations thereof, in the specification and claims of this application and the accompanying drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products, or apparatuses. In the claims, specification, and accompanying drawings of this application, relational terms such as "first" and "second" are used only to distinguish one entity / operation / object from another entity / operation / object, and do not necessarily require or imply any actual relationship or order between these entities / operations / objects.

[0062] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase at various locations in the specification does not necessarily refer to the same embodiment, nor are independent or alternative embodiments mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0063] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0064] In one embodiment, Figure 1 FIG. 1 is a flow chart of a simulation optimization design method for a stay cable tower top hanger of the present application, the method comprising:

[0065] S10. Establish a three-dimensional finite element model of the tower top hanger according to the current tower top hanger design.

[0066] Specifically, based on the actual tower hanger design or detailed structural drawings, finite element software such as Midas / Civil, Ansys, and Abaqus was used to model and analyze the tower hanger. During modeling, key geometric parameters such as the length, cross-sectional shape, angle, and interconnection location of each beam element were ensured to be consistent with actual conditions. For complex node structures, such as intersections between beam elements and anchorage points between beams and stay cables, more precise modeling methods, such as solid modeling or polyhedral meshing, were employed to avoid errors caused by geometric simplification. After the model was established, material parameters, such as elastic modulus, Poisson's ratio, and density, were determined based on the actual materials used in the tower hanger. For hanger structures composed of multiple materials, the corresponding material properties were accurately assigned to each component to ensure that the model truly reflects the structural response characteristics under stress. Then, reasonable boundary conditions can be set. For example, the parts fixed to the tower top can be set as fixed constraints to limit their translation and rotation in the corresponding directions. For connection points that have a certain amount of movement space but are also restricted, they can be set as corresponding hinge supports and other constraint forms to simulate the actual force transmission boundary conditions.

[0067] During the simulation calculation, the boundary conditions at the columns, the bottom of the diagonal braces and the tower crown side wall support positions are calculated as consolidation, and the remaining members are calculated as beam unit members to establish a spatial structure model. All types of beam units are simulated and calculated according to the actual unit cross-section and material conditions to accurately reflect the stress state of the structure. Figure 2 As shown, in one embodiment of the present application, a finite element calculation model of a tower top hanger is established based on the design structure using finite element software.

[0068] S11. Set different working conditions and determine the static load of each component node under different working conditions;

[0069] Specifically, for the designed tower gantry, multiple operating conditions are simulated based on the actual conditions of the hoisting process, including hoisting conditions and non-hoisting operating conditions (subject to loads caused by inclement weather). For example, conditions corresponding to a first wind load superimposed on the cable during various lifting and installation operations are set, as well as conditions where the tower gantry is not in operation and a second wind load is superimposed, where the first wind load is less than the second wind load. Preferably, in one embodiment, to faithfully reflect actual operating conditions, the present application sets the following operating conditions for simulation and verification based on actual construction conditions:

[0070] Working condition 1: Cable hoist installation 1 - Loading the main lifting points on both sides, located outside the beam, taking into account the deadweight of the structure, dynamic load of hoisting and wind load of level 5-7;

[0071] Working condition 2: Cable hoist installation 2 - loading of the main lifting points on both sides of the single side, located outside the beam, taking into account the deadweight of the structure, dynamic load of the hoisting and wind load of level 5-7;

[0072] Working condition 3: Cable hoisting installation 3 - loading on one side of the main lifting point, located outside the beam, taking into account the deadweight of the structure, dynamic load of the hoisting and wind load of level 5-7;

[0073] Working condition 4: Cable hoist installation 4 - loading of the main lifting points on both sides of the single side, located on the inner side of the beam, taking into account the deadweight of the structure, the dynamic load of the hoisting and the wind load of level 5-7;

[0074] Working condition 5: Wind load in non-working state - considering the deadweight of the structure and wind loads above level 10.

[0075] The static load of each component node is the relatively stable load on the tower top hanger under the corresponding working conditions, including the self-gravity of the component structure and the simulated wind load of the current working conditions. The wind load determination 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:

[0076]

[0077] Among them, ρ a is the air density, which is generally 1.25kg / m3, η is the shielding coefficient, C is the wind resistance coefficient, which is 1.9, and 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 load on each component is relatively stable during simulation.

[0078] S12. Determine the cable-hanger coupling interface node, determine the dynamic load of the coupling interface node under each working condition based on historical lifting parameters, apply the static load and the dynamic load to each node for simulation finite element analysis and calculation, and obtain the calculation results under each working condition of the tower top hanger.

[0079] In the cable-stayed hoisting project, the winch provides tension as a power source, and the tower-top hanger is responsible for transmitting the tension to the tower top and distributing it to various fulcrums. In order to accurately simulate the stress conditions of the winch and the mechanical response of the tower-top hanger substructure, this application regards the winch and the tower-top hanger as an interrelated system through a coupling interface. This application determines the connection point between the winch and the tower-top hanger through the wire rope as the cable-stayed cable-hanger coupling interface node. The number of 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 actual conditions (for example, in some cases, the winch wire rope is connected to the hanger through a fixed pulley), thereby realizing force transmission and mutual influence. The coupling operation at the interface can comprehensively consider the influence of the dynamic tension changes of the winch and the structural deformation of the tower-top hanger on each other, thereby more realistically reflecting the mechanical behavior of the entire hoisting process.

[0080] After setting different working conditions, this application scheme simulates the dynamic impact of different loads on the system during the hoisting process under different working conditions, based on the actual hoisting requirements and hoisting parameters (speed, acceleration), so as to accurately simulate and reflect the stress conditions of the system and verify the rationality of the current design.

[0081] Furthermore, the present application solution determines the hoisting parameters based on historical data and requirements of the historical hoisting process, and calculates and determines the simulated dynamic load based on the historical hoisting parameters under different working conditions. The dynamic load is then applied to the corresponding nodes for simulation finite element analysis and calculation to obtain the calculation results under various working conditions of the tower top hanger. Specifically, it includes:

[0082] S121. Divide the stay cable hoisting process into multiple stages for simulation.

[0083] In one embodiment, the present application divides the hoisting process of the stay cable into three main phases: the startup phase, the constant speed lifting phase, and the positioning phase. Simulations are then performed to determine the corresponding parameters. The startup phase involves the tension needed to overcome the weight of the cable, the cable itself, and the initial friction of the connecting components to accelerate the installation of the stay cable. The constant speed lifting phase involves the tension remaining relatively stable, while the cable is lifted at a constant speed. The positioning phase involves the winch decelerating as it approaches the preset installation position.

[0084] S122. Determine the dynamic load of each simulation time step under the current working condition based on the historical lifting data, and apply the dynamic load to the corresponding coupling interface node.

[0085] Specifically, the lifting parameters (speed, acceleration, etc.) for each stage of the current working condition are determined based on historical lifting data. Dynamic loads for each simulation time step are then determined based on these parameters and applied to the corresponding coupling interface nodes. During simulation, the lifting process parameters corresponding to the actual time are mapped to the corresponding simulation time step. For example, based on the simulation accuracy and computing resources, the proportional relationship between the actual time and the simulation time step is determined, and a mapping table is created to associate the actual time points with the corresponding simulation time steps. The mapping table should include sufficient time points to ensure that all key stages of the lifting process are accurately simulated.

[0086] S123. Obtain the load, deformation, and support reaction force of the hanger under the current working condition according to the interface iterative coupling operation.

[0087] The basic principle and idea of ​​the iterative coupling operation of this application is: calculate the stress condition of the tower top hanger at the interface according to the dynamic load of the winch, and then obtain the deformation and stress distribution of the tower top hanger, and then feed back the deformation information of the tower top hanger to the winch-wire rope, and then update the stress condition of the winch, and calculate the response of the tower top hanger again, and repeat the iteration until the stress condition and deformation state of the tower top hanger and the winch converge. During the iterative process, numerical calculation methods such as finite element method, finite difference method, etc. can be used to discretize the structure of the tower top hanger and solve its mechanical equations. Furthermore, the load, deformation and support reaction force of the hanger under the current working condition are obtained according to the iterative coupling operation of the interface, including:

[0088] S1231. Establish a cable-hanger interface coupling solution model and initialize the interface coupling parameters.

[0089] Specifically, the interface coupling solution model is established based on the force balance condition and the displacement coordination condition, wherein the force balance condition is that the pulling force provided by the hoist is equal to the force exerted on the tower top hanger at the interface; the displacement deformation coordination condition is that the transient displacement u of the tower top interface node is equal to the displacement u of the tower top interface node. f It will be transmitted to the wire rope through inertial force or elastic wave, causing dynamic elastic deformation Δl.

[0090] Initial interface coupling parameters after establishing the solution model: initial displacement u of the tower top hanger f =0, the initial stress is 0.

[0091] S1232. Determine the velocity and acceleration at the current time step t based on the historical lifting process data to obtain the current dynamic load F t :

[0092]

[0093] Where ρ is the linear density of the cable, g is the acceleration of gravity, L t 、a t 、v t are the current cable length, acceleration, and velocity, c is the damping coefficient, and F w The tension compensation of the wind load on the cable is F w Simulation and quantification can be performed by combining historical data and / or data such as wind speed level and hoisting length, where E, A, l, and Δl are the elastic modulus, cross-sectional area, elastic deformation, and initial length of the wire rope, respectively. Furthermore, when specifically determining and quantifying the dynamic load, the hoisting angle parameter can be optimized based on actual conditions or needs.

[0094] S1233. Based on the finite element method, solve the displacement and stress distribution of each component of each node of the tower top hanger under the preset wind load, self-gravity and the interface node under the dynamic load Ft, and extract the displacement at the interface.

[0095] Specifically, assuming 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 distributed forces equivalent to the nodes through integration. For nodes at the interface, in addition to self-gravity and wind loads, the current dynamic load Ft is also included.

[0096] The stiffness matrices of all beam elements are assembled into the overall stiffness matrix [K], the node displacement vectors are assembled into {u}, and the node force vectors are assembled into {F}, where the node forces at the interfaces are also superimposed with F t , solve the equation group [K]{u}={F} according to the boundary conditions, and obtain the node displacement vector {u}, and then obtain the displacement u at the interface f .

[0097] Preferably, the present application assembles the stiffness matrices of all beam units into an overall stiffness matrix [K] according to the node number and topological relationship. Specifically, the elements of each unit stiffness matrix are superimposed on the corresponding position of the overall stiffness matrix. For example, unit 1 connects node 1 and node 2, then the elements in the stiffness matrix of unit 1 related to the degrees of freedom of node 1 and node 2 will be superimposed on the corresponding position in the overall stiffness matrix. When assembling the overall stiffness matrix, the boundary conditions are further considered. For the fixed end, the corresponding degrees of freedom need to be processed in the overall stiffness matrix, and the rows and columns corresponding to the degrees of freedom are modified to meet the constraints of the fixed end. For example, if node 1 is a fixed end, in the rows and columns of the overall 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 elements are set to a large number.

[0098] S1234. Update the elastic deformation Δl of the wire rope by feeding back the interface displacement.

[0099] 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 must meet the coordination conditions. 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 represented by a simplified engineering model:

[0100] Within the elastic range, if the tower top interface displacement u f It is much smaller than the structure size, so the higher-order terms can be ignored and Δl can be approximated as a linear function of the node displacement: Δl≈α⋅u f (α is the geometric coefficient), for example, the vertical displacement of the tower top u z The relationship with the elongation of the wire rope can be simplified as: Δl=u z / sinθ, When the wire rope inclination angle θ is small, sinθ is approximately constant. The equivalent stiffness method can also be used to convert the wire rope elastic stiffness EA / L0 to the tower top node to form the equivalent stiffness K eq , then, according to the node displacement u f Calculate the equivalent deformation of the wire rope: .

[0101] S1235. Determine whether the force at the interface is converged. If so, calculate the force, deformation, and support reaction of each beam unit of the tower top hanger at the current time step t.

[0102] Due to the dynamic load F t The top of the tower then shifts, causing Δl to change and F to t Changes again. Therefore, this application determines whether convergence has occurred by updating and iterating to determine whether Δl is less than a preset error threshold each time. If not, Ft at the current time step is updated and iterated, and the process returns to S1132 for iterative calculations until Δl is less than the preset error threshold, indicating that the force at the current time step is stable and the simulation is stable. If convergence is satisfied, the force, deformation, and reaction force of each support point of the tower top hanger beam unit at the current time step t are calculated, specifically including:

[0103] 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.

[0104] The pivot reaction force can be obtained by solving the equilibrium equation. According to the reaction force calculation principle: In finite element analysis, the reaction force results at the pivot are obtained by solving the equilibrium equation of the structure. Therefore, in one embodiment of the present application, when solving the pivot reaction force of a complex tower top hanger composed of multiple rods, the forces and moments acting on each pivot are aggregated and calculated according to the equilibrium equation at the pivot connected to the tower top to obtain the specific values ​​of the pivot reaction forces in each direction.

[0105] 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 around the x, y, and z directions: By solving these equations together, we can solve all the support reaction components and calculate the support reaction components Rx, Ry, and Rz along the x, y, and z directions respectively, and then obtain the reaction force of each support.

[0106] S1236. Update the time step t=t+Δt, where Δt is the simulation time interval, until the simulation under the current working condition is completed.

[0107] Specifically, the continuous time process is discretized into a series of time steps t0, t1, …, tn, and the 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.

[0108] 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 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 to make the calculation results closer to the actual situation, thereby improving the accuracy of the calculation results.

[0109] 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.

[0110] 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, the software searches for the stress and deformation values ​​of each node and each unit to find the maximum and minimum values. 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 will give the envelope value range. And by drawing internal force and deformation cloud maps, generating internal force numerical maps, etc., the force magnitude and change trend of each part are intuitively presented, the distribution of key components and dangerous sections with large forces is determined, and it is analyzed whether they exceed the allowable stress and allowable deformation of the material. If exceeded, the structure needs to be optimized, such as adjusting the cross-sectional size of the rods, changing the structural form, etc., to ensure the safety of the structure during the installation of the cable.

[0111] like Figure 3-Figure 5 Shown are 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 various working conditions extracted based on the simulation results, and a schematic diagram of the corresponding cloud map data generated based on this.

[0112] S14. Based on the simulation calculation results, verify the rationality of the current tower top hanger design and optimize the selection of corresponding components.

[0113] Specifically, the stress, strain, deformation and other results of the hanger components obtained through the simulation analysis of different working conditions are compared with the allowable values ​​in the specifications and standards to verify 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 corresponding components.

[0114] The fulcrum is mainly anchored to the outer wall of the tower through embedded parts by diagonal supports. The embedded parts are composed of embedded screws, climbing cones, and high-strength bolts. Preferably, in one embodiment, the application verifies and optimizes the rationality of the current tower top hanger design, including the stability and rationality of the current design of the diagonal support embedded components, specifically including:

[0115] Calculate the shear value N of each high-strength bolt based on the current tower top hanger v , local compressive bearing capacity N c And the local compressive bearing capacity of the climbing cone N l :

[0116]

[0117] n v is the number of shear surfaces, d is the bolt rod diameter, f v is the design value of the bolt shear strength, f c is the design value of the local compressive strength of the bolt, f l is the axial compressive strength of concrete, β c is the concrete strength influence coefficient, β l is the strength improvement coefficient of concrete when it is locally compressed, and A is the net area of ​​concrete under local compression;

[0118] Based on the reaction forces of each support point of the tower top hanger, the maximum shear force V and normal pressure N of the diagonal rod embedded parts are extracted;

[0119] Determine whether the shear resistance and local bearing pressure of each high-strength bolt currently selected are greater than max(V, N);

[0120] If not, adjust the current high-strength bolt and / or climbing cone selection and / or design.

[0121] In another embodiment, the present application solution optimizes and determines the selection of each component including the selection of the winch and the wire rope:

[0122] Extract the maximum hoisting load under each working condition and determine the rope tension S for heavy equipment hoisting based on the maximum load:

[0123]

[0124] Where k is the number of guide pulleys, n is the number of working ropes of the pulley group, Gm is the maximum hoisting load, and f is the rotation resistance coefficient of a single pulley;

[0125] Determine the type of tower top gantry hoisting winch and wire rope based on the rope head tension.

[0126] For example, in one embodiment, based on the extracted maximum lifting load Gm=432.82KN, the rotational resistance coefficient of a single pulley f=1.04, the number of guide pulleys k=2, and the number of working ropes of the pulley group n=6, the rope head tension value S can be calculated to be 85.9KN. Based on the rope head tension and the current construction requirements, it can be determined that a 10-ton winch is selected as the tower top gantry winch, and the steel wire rope is a galvanized steel wire rope (6×37) with a diameter of Φ30mm. Its breaking tension is 526KN (nominal tensile strength 1770MPa), and the safety factor K=526 / 85.9=6.13>5 (construction safety requirements) to ensure the safety of subsequent actual construction.

[0127] The above-mentioned scheme of the present application can more accurately simulate the dynamic force changes during the installation process of the inclined cable, accurately calculate the force borne by the tower top hanger, the deformation generated and the reaction force of the support, and can intuitively display the data of the entire process, so that the simulation model is more in line with the actual working conditions, and provide a more reliable basis, solid and effective technical support and guarantee for the design, construction and safety assessment of the tower top hanger.

[0128] In one embodiment, Figure 6 As shown, the present application also provides a simulation optimization design system for a stay cable tower top hanger, the system comprising:

[0129] A model building unit, configured to build a three-dimensional finite element model of the tower top hanger according to the current tower top hanger design;

[0130] The working condition setting unit is used to set different working conditions and determine the static load of each component node under different working conditions;

[0131] The simulation unit is used to determine the cable-hanger coupling interface node, determine the dynamic load of the coupling interface node under each working condition based on historical lifting parameters, and apply the static load and the dynamic load to each node to perform simulation finite element analysis and calculation to obtain the calculation results under each working condition of the tower top hanger;

[0132] The data extraction unit is used to extract the envelope value of the calculation results under various working conditions 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;

[0133] The verification and optimization unit is used to verify the rationality of the current tower top hanger design based on simulation results and optimize the selection of corresponding components.

[0134] In one embodiment, Figure 7 The present application also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the above method steps.

[0135] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the 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-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various 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).

[0136] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0137] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A simulation optimization design method for a stay cable tower top hanger, characterized in that: The method comprises: Establishing a three-dimensional finite element model of the tower top hanger according to the current tower top hanger design; Set different working conditions and determine the static load of each component node under different working conditions; Determine the dynamic load of the cable-hanger coupling interface node under each working condition based on historical hoisting data, apply the static load and the dynamic load to each node, perform finite element simulation analysis and calculation to obtain the calculation results under each working condition of the tower top hanger; Extract the envelope value 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 reaction force of each support point, and generate the corresponding cloud map data; Verify the rationality of the current tower top hanger design based on simulation results and optimize the selection of corresponding components; Wherein, the finite element simulation analysis calculation includes: Divide the stay cable hoisting process into multiple stages for simulation; Determine the dynamic load of each simulation time step under the current working condition based on historical lifting data, and apply the dynamic load to the corresponding coupling interface node; The load, deformation and support reaction force of the hanger under the current working condition are obtained according to the interface iterative coupling operation.

2. The method according to claim 1, characterized in that The different working conditions include: Setting working conditions of the stay cable corresponding to a first wind load superimposed under various lifting and installation operations, and setting working conditions of the tower top hanger corresponding to a second wind load superimposed in a non-working state; Wherein, the first wind load is smaller than the second wind load.

3. The method according to claim 1, characterized in that The load, deformation and support reaction force of the hanger under the current working condition are obtained according to the interface iterative coupling operation, including: Establish a cable-hanger interface coupling solution model and initialize the interface coupling parameters; Determine the current time step based on historical lifting process data t The velocity and acceleration under the load are used to obtain the current dynamic load. F t : in, ρ is the linear density of the cable, g is the acceleration due to gravity, L t 、a t 、v t are the current length, acceleration and speed of the cable respectively, c is the damping coefficient, F w To compensate for the wind load tension of the cable, E, A, l, Δl are the elastic modulus, cross-sectional area, elastic deformation and initial length of the wire rope respectively; Each node is superimposed with static loads and dynamic loads at the interface F t Under the action of gravity, the displacement and stress distribution of each component of the tower top hanger are solved based on the finite element method, and the displacement at the interface is extracted; Update the elastic deformation of the wire rope with the displacement at the interface Δl ; Determine whether the force at the interface converges. If so, calculate the current time step t The stress, deformation and support reaction of each beam unit of the tower top hanger; Update time step t = t + Δt , Δt It is the simulation time interval until the simulation under the current working condition is completed.

4. The method according to claim 1, wherein The method further comprises: The boundary conditions at the columns of the tower top hanger, the bottom of the diagonal brace and the supporting position of the tower crown side wall are calculated as consolidation; The remaining members are simulated and calculated according to the spatial structure model and the unit section material conditions corresponding to the beam unit members.

5. The method according to claim 1, wherein The method further comprises: Calculate the shear value of each high-strength bolt based on the current tower top hanger N v , local pressure bearing capacity N c and local compressive bearing capacity of the climbing cone N l ; Based on the reaction forces of each support point of the tower top hanger, the maximum shear force V and normal pressure U of the diagonal rod embedded parts are extracted; Determine the shear resistance value of each high-strength bolt currently selected N v , local bearing pressure bearing capacity N c and local compressive bearing capacity of the climbing cone N l Is it greater than max(V, U) / N, where N is the number of climbing cones; If not, adjust the current high-strength bolt and / or climbing cone selection and / or design.

6. The method according to any one of claims 1 to 5, characterized in that The method further comprises: Extract the maximum load for each working condition and determine the rope tension for heavy equipment lifting based on the maximum load S : in, k is the number of guide pulleys, n is the number of working ropes of the pulley group, G m is the maximum lifting load, f is the rotational resistance coefficient of a single pulley; Determine the type of tower top gantry hoisting winch and wire rope based on the rope head tension.

7. A simulation optimization design system for a stay cable tower top hanger, characterized in that: The system comprises: A model building unit, configured to build a three-dimensional finite element model of the tower top hanger according to the current tower top hanger design; The working condition setting unit is used to set different working conditions and determine the static load of each component node under different working conditions; The simulation unit is used to determine the dynamic load of the cable-hanger coupling interface node under each working condition based on historical lifting data; and apply the static load and the dynamic load to each node to perform simulation finite element analysis calculation to obtain the calculation results under each working condition of the tower top hanger; wherein the finite element simulation analysis calculation includes: The cable hoisting process is divided into multiple stages for simulation. The dynamic load of each simulation time step under the current working condition is determined based on historical hoisting data. The dynamic load is applied to the corresponding coupling interface node. The load, deformation and support reaction force of the hanger under the current working condition are obtained according to the interface iterative coupling operation. The data extraction unit is used to extract the envelope value 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 force of each support point, and generate the corresponding cloud map data; The verification and optimization unit is used to verify the rationality of the current tower top hanger design based on simulation results and optimize the selection of corresponding components.

8. A computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, the processor is caused to perform the steps of the method according to any one of claims 1 to 6.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor is caused to perform the steps of the method according to any one of claims 1 to 6.

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