Transmission Tower Anti-Ice Capacity Checking Method, Electronic Device and Computer Storage Medium

Abstract

The present invention discloses a method for checking the ice resistance of a transmission tower, an electronic device, and a computer storage medium, including: obtaining the structural parameters of the transmission tower, the structural parameters of the line, and the meteorological parameters of the line; calculating the static load acting on the nodes of the transmission tower based on the structural parameters of the transmission tower, the structural parameters of the line, and the meteorological parameters of the line; checking the static ice resistance of the transmission tower based on the static load; if the check of the static ice resistance of the transmission tower is qualified, calculating the dynamic load acting on the line based on the structural parameters of the line and the historical maximum ice thickness; checking the dynamic ice resistance of the transmission tower based on the dynamic load; if the check of the dynamic ice resistance of the transmission tower is qualified, the comprehensive ice resistance check of the transmission tower is qualified. The present invention considers the influence of line icing on the stress distribution of the transmission tower structure from two perspectives of static ice accumulation and dynamic ice shedding, and the check result is more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission towers, and particularly to a method for checking the ice resistance of transmission towers, an electronic device, and a computer storage medium. Background Art

[0002] As an important component of the transmission line system, a transmission tower is an important support for fittings such as overhead lines, spacer dampers, and insulator strings. Since it is directly exposed to the atmospheric environment, the transmission tower is affected by rain, snow, wind, and frost in the outdoor environment. Therefore, whether its structural strength can resist the erosion of the harsh environment in the area it passes through is crucial to the power supply reliability of the entire line and even the entire power grid.

[0003] Among them, transmission line projects in plateau areas are severely affected by extreme conditions and complex environmental icing such as ultra-high altitude, heavy ice areas, large spans, large height differences, uninhabited areas, forests, and river valleys. Icing has become a serious threat to the operation of transmission lines. In low-temperature rain and snow weather, the relative humidity is high, and a large amount of water vapor is easily condensed on the surface of the transmission line to form ice, causing ice disasters in the power system. After a large amount of ice covers the conductors and components on the transmission tower, the weight of the ice will increase, bringing a huge load to the transmission tower. If the ice load exceeds the design bearing capacity of the transmission tower, it may cause the transmission tower to collapse. In addition, icing will bring additional loads to the structural components of the transmission tower and may cause problems such as structural loosening, corrosion, or cracking. These structural problems will weaken the stability of the transmission tower and increase the risk of collapse.

[0004] In related technologies, the evaluation of the ice resistance of transmission towers under icing has been studied, and the main research methods include structural tests and numerical simulations. However, it is difficult to apply the research methods for evaluating the ice resistance of transmission towers to the upgrade and transformation of existing transmission tower structures. And the transmission tower structures designed under the existing specifications can no longer effectively cope with the challenges in the new environment. Therefore, it is urgent to propose a set of transmission tower standards that meet the requirements of icing strength to be able to check the structural strength of existing transmission tower structures and then provide guidance for the subsequent upgrade and transformation of transmission towers. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for checking the ice resistance of transmission towers that can check the structural strength of existing transmission towers under icing conditions, so as to provide guidance for the upgrade and transformation of existing transmission towers.

[0006] To achieve the above object, the present invention proposes a method for checking the ice resistance of a transmission tower, including: obtaining the structural parameters of the transmission tower, the structural parameters of the line, and the meteorological parameters of the line, where the line is the line where the transmission tower is located, and the meteorological parameters of the line include the historical maximum ice thickness; calculating the static load acting on the nodes of the transmission tower based on the structural parameters of the transmission tower, the structural parameters of the line, and the meteorological parameters of the line, where the intersection point of the central axes of the components in the transmission tower is defined as the node; checking the static ice resistance of the transmission tower based on the static load; if the static ice resistance of the transmission tower passes the check, calculating the dynamic load acting on the line based on the structural parameters of the line and the historical maximum ice thickness; checking the dynamic ice resistance of the transmission tower based on the dynamic load; if the dynamic ice resistance of the transmission tower passes the check, the comprehensive ice resistance of the transmission tower passes the check.

[0007] In an alternative embodiment, the method further includes: constructing a finite element calculation model of the transmission tower based on the structural parameters of the transmission tower, the structural parameters of the line, and the historical maximum ice thickness; applying the static load to the corresponding nodes of the finite element calculation model of the transmission tower, calculating the stress distribution of each part of the structure of the transmission tower, and completing the check of the static ice resistance of the transmission tower; calculating the dynamic load on the line based on the finite element calculation model of the transmission tower; applying the dynamic load to the corresponding nodes of the finite element calculation model of the transmission tower, calculating the stress time history curve of each part of the structure of the transmission tower, and completing the check of the dynamic ice resistance of the transmission tower.

[0008] In an alternative embodiment, applying the static load to the corresponding nodes of the finite element calculation model of the transmission tower, calculating the stress distribution of each part of the structure of the transmission tower, and completing the check of the static ice resistance of the transmission tower specifically includes: applying a gravity field, obtaining the deformation and stress distribution of the transmission tower under the action of the self-weight load; loading the static load value; based on the deformation and stress distribution of the transmission tower and the static load value, solving through the finite element calculation model of the transmission tower to obtain the axial stress values of each main member and diagonal member of the transmission tower; if the axial stress values do not exceed the tensile strength and compressive strength of the corresponding main members and diagonal members, the check result of the static ice resistance of the transmission tower is qualified.

[0009] In an alternative embodiment, the dynamic load is applied to the corresponding nodes of the finite element calculation model of the transmission tower, and the stress time history curves of each part of the structure of the transmission tower are calculated to complete the verification of the dynamic ice resistance of the transmission tower. Specifically, it includes: applying the gravitational acceleration in the vertical direction; loading the dynamic load value; based on the gravitational acceleration and the dynamic load value, through the finite element calculation model of the transmission tower, obtaining the axial stress time history curves of each main member and diagonal member of the transmission tower under each de-icing scenario; if the maximum stress value of the axial stress time history curve does not exceed the tensile strength and compressive strength of the corresponding main member and diagonal member, the verification result of the dynamic ice resistance is qualified.

[0010] In an alternative embodiment, the line structure parameters include the span, height difference, altitude, and overhead line type connected to both sides of the transmission tower. The line meteorological parameters further include the local historical maximum wind speed and the average temperature under icing conditions. The overhead line includes conductors and ground wires. The finite element calculation model of the transmission tower includes a finite element calculation sub-model of the overhead line. Constructing the finite element calculation sub-model of the overhead line specifically includes: based on the span, height difference, and overhead line type, combining with the catenary configuration equation, determining the geometric model of the overhead line under self-weight as follows: In the formula, is the node The vertical height relative to the low-hanging point of the overhead line of the transmission tower; is the node The horizontal distance from the low-hanging point of the overhead line of the transmission tower; is the horizontal distance from the lowest point of the overhead line to the low-hanging point of the transmission tower; based on the span, height difference, and overhead line type, combining with the catenary configuration equation, determining the geometric model of the overhead line under self-weight as follows: ; In the formula, is the node The vertical height relative to the low-hanging point of the overhead line of the transmission tower; is the node The horizontal distance from the low-hanging point of the overhead line of the transmission tower; is the horizontal distance from the lowest point of the overhead line to the low-hanging point of the transmission tower; converting the geometric model of the overhead line into a finite element calculation sub-model of the overhead line.

[0011] In an alternative embodiment, calculating the dynamic load on the line based on the finite element calculation model of the transmission tower specifically includes: setting an initial strain and applying a gravitational acceleration based on the finite element calculation sub-model of the overhead line to obtain a self-weight shaped overhead line. Based on the finite element calculation sub-model of the overhead line, using the overhead line equivalent density calculation formula to adjust the line mass density of the overhead line to obtain a uniformly iced overhead line configuration across the entire span under the historical maximum ice thickness. Among them, the overhead line equivalent density calculation formula is as follows: ; In the formula, is the ice-covered density; is the equivalent diameter of the overhead line, is the equivalent thickness of circular ice accretion, is the mass per unit length of the overhead line, is the cross-sectional area of the overhead line; Simulate the crosswind time-history pulsating wind speed at the spatial nodes of the overhead line under the configured ice-covered overhead line, and superimpose the crosswind time-history pulsating wind speed on the historical maximum wind speed to obtain the instantaneous wind load time-history curves of different nodes as follows: ; where, is the historical maximum wind speed, is the turbulence integral scale of the component, is the crosswind pulsating wind power spectrum; Again, based on the overhead line finite element calculation sub-model, adopt the first equivalent density calculation formula to change the density of the locally ice-covered overhead line element to the density of the bare conductor before ice accretion; Based on the density of the bare conductor before ice accretion and the instantaneous wind load time-history curve, obtain the dynamic load.

[0012] In an optional implementation manner, the transmission tower structure parameters include the lofting drawing of the transmission tower, and the finite element calculation model of the transmission tower is constructed based on finite element structural analysis software, specifically including: defining the intersection point of the central axes of each component in the transmission tower in the lofting drawing of the transmission tower as the node of the finite element model, and defining the part between two adjacent nodes as the element; defining the node types including the intersection points of main diagonal members and the intersection points of cross diagonal members; defining the element types including beam elements and rod elements, where the main members and diaphragms are defined as the beam elements; defining the diagonals as the rod elements.

[0013] In an optional implementation manner, the static loads include the horizontal static wind load on the nodes of the transmission tower, the horizontal static wind load acting on the overhead line, the vertical static ice accretion load acting on the overhead line, the ice accretion load directly acting on the angle steel of the transmission tower, and the tension load under the self-weight of the overhead line. Based on the transmission tower structure parameters, the line structure parameters, and the line meteorological parameters, the line structure parameters include the span, height difference, altitude, and overhead line model connected on both sides of the transmission tower, and the line meteorological parameters also include the local historical maximum wind speed and the average temperature under ice accretion conditions. The line meteorological parameters also include the local historical maximum wind speed and the average temperature under ice accretion conditions. Based on the transmission tower structure parameters, the line structure parameters, and the line meteorological parameters, calculate the static loads acting on the nodes of the transmission tower, specifically including: calculate the horizontal static wind load on the nodes of the transmission tower according to the following formula: ; where, is the shape coefficient of the transmission tower, is the height the windward area of the ice-covered tower at the place, is the number of segments of the entire transmission tower, is the height is the maximum natural wind speed after superposition at the location, is the air density, and the calculation formula is as follows: ; in the formula, is the average altitude of the area where the line is located, is the average temperature under icing conditions in the area where the line is located; ; in the formula, is the wind speed at a standard height of 10 meters, is the correction coefficient, is the roughness index; the horizontal static wind load acting on the overhead line is calculated according to the following formula: ; in the formula, is the shape coefficient of the overhead line, is the equivalent diameter of the overhead line, is the annular equivalent icing thickness, is the height of the hanging points on both sides of the overhead line; the vertical static icing load acting on the overhead line is calculated according to the following formula: ; in the formula, is the icing density, is the span, is the local acceleration of gravity; the tension load under the self-weight of the overhead line at the transmission tower node is calculated according to the following formula: Tension direction: ; in the formula, is the cross-sectional area of the overhead line, is the mass per unit length of the overhead line, , are the hyperbolic cosine functions, is the horizontal stress of the overhead line, is the horizontal distance from the lowest point of the overhead line to the hanging point of the transmission tower, and the calculation formula is as follows: ; ; in the formula, is the calculated breaking force of the overhead line, is the design safety factor of the overhead line, is the inverse hyperbolic sine function; based on the finite element calculation model of the transmission tower, directly change the material density of the angle steel, and through the equivalent density after icing, obtain the icing load directly acting on the angle steel of the transmission tower, where the calculation formula of the equivalent density after icing is as follows: ; in the formula, is the equivalent icing cross-sectional area of the angle steel, is the density of the angle steel, is the cross-sectional area of the angle steel.

[0014] The present invention also provides an electronic device, comprising: at least one processor; a memory communicatively connected to the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute any one of the transmission tower anti-icing capacity checking methods.

[0015] The present invention also provides a computer storage medium storing a computer program, and when the computer program is executed by a processor, it implements any one of the transmission tower anti-icing capacity checking methods.

[0016] The beneficial effects of the present invention are as follows: By correcting the air characteristic parameters in high-altitude areas, accurate solution and application of wind loads in a low-pressure environment can be achieved, and the influence of line icing on the stress distribution of the transmission tower structure is considered from two aspects of static icing and dynamic de-icing, fully restoring the mechanical action of the plateau environment on the transmission tower structure. The checking results can provide a reference for the design of transmission lines and the prevention and control of wind and snow disasters in plateau areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a flowchart of a method for checking the anti-icing capacity of a transmission tower provided for an embodiment of the present invention;

[0018] Figure 2 It is a flowchart of another method for checking the anti-icing capacity of a transmission tower provided for an embodiment of the present invention;

[0019] Figure 3 It is an axial force distribution diagram of a whole transmission tower under the action of self-weight load without icing provided for an embodiment of the present invention;

[0020] Figure 4 It is a spatial configuration diagram of the self-weight shape-finding of the middle-phase conductor on the left side of the transmission tower before and after the self-weight shape-finding provided for an embodiment of the present invention;

[0021] Figure 5 It is an axial force distribution diagram of a whole transmission tower under the action of a combined static load of 15 mm icing + historical maximum wind speed provided for an embodiment of the present invention;

[0022] Figure 6 It is an axial force distribution diagram of a whole transmission tower under the action of dynamic tension load 10 seconds after de-icing in the scenario of an initial de-icing rate of 15% + mid-span de-icing provided for an embodiment of the present invention;

[0023] Figure 7 It is a block diagram of the composition of an electronic device provided for an embodiment of the present invention.

[0024] Description of the reference numerals:

[0025] 110. Processor; 120. Memory. Specific Embodiment

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] The coverage area of the transmission corridor is getting wider and wider, and the transmission line inevitably passes through various icing areas with complex terrains and cold climates. In recent years, with the increasingly warming global climate, various extreme disasters have occurred frequently, and the collapse accidents of transmission towers in plateau areas have occurred from time to time. The main reason is that the structure of the transmission tower under the existing standard design can no longer effectively cope with the challenges of the new environment. It is urgent to propose a set of transmission tower standards that meet the strength requirements in the new environment, check the structural strength of the existing transmission towers, and then provide guidance for subsequent upgrading and transformation.

[0028] As Figure 1 and Figure 2 shown, according to an embodiment of the present invention, on the one hand, a method for checking the anti-icing ability of a transmission tower is provided, including the following steps:

[0029] Step S101: Obtain the transmission tower structure parameters, line structure parameters, and line meteorological parameters. The line is the line where the transmission tower is located, and the line meteorological parameters include the historical maximum ice thickness.

[0030] Step S103: Based on the transmission tower structure parameters, line structure parameters, and line meteorological parameters, calculate the static load acting on the nodes of the transmission tower, where the intersection point of the central axes of each component in the transmission tower is defined as the node.

[0031] Step S105: Check the static anti-icing ability of the transmission tower based on the static load.

[0032] Step S107: If the static anti-icing ability check of the transmission tower is qualified, calculate the dynamic load acting on the line based on the line structure parameters and the historical maximum ice thickness.

[0033] Step S109: Check the dynamic anti-icing ability of the transmission tower based on the dynamic load.

[0034] Step S1011: If the dynamic anti-icing ability check of the transmission tower is qualified, the comprehensive anti-icing ability check of the transmission tower is qualified.

[0035] Transmission towers are usually iron towers. The structural parameters of transmission towers mainly include the lofting drawings of transmission towers, which contain the detailed dimensions of each part of the transmission tower and the corresponding angle steel models. These parameters are crucial for the design and manufacture of transmission towers, ensuring the structural strength and stability of transmission towers. The line structural parameters mainly include the span, elevation difference, altitude, conductor model, and ground wire model connected on both sides of the transmission tower. The span refers to the distance between adjacent transmission towers, the elevation difference refers to the vertical height difference between transmission towers, the altitude involves the geographical height of the location where the transmission tower is located, and the conductor model and ground wire model are directly related to the transmission efficiency and safety of the transmission line. The line meteorological parameters mainly include the local historical maximum wind speed, maximum ice thickness, and average temperature under icing conditions. These meteorological parameters are crucial for evaluating the performance of transmission lines under extreme weather conditions because they affect the stability and safety of the lines.

[0036] Based on the obtained static loads, the static ice resistance capacity of the transmission tower is checked to ensure that the transmission tower can withstand the additional pressure caused by ice loads under static conditions. Then, the stability and safety of the transmission tower structure are evaluated under dynamic conditions, that is, when the ice load changes over time. If the dynamic ice resistance capacity of the transmission tower is also confirmed to be qualified, then it can be concluded that the comprehensive ice resistance capacity of the transmission tower meets the requirements. Therefore, by considering the influence of line icing on the stress distribution of the transmission tower structure from the two aspects of static icing and dynamic de-icing, the mechanical action of the environment on the transmission tower structure is fully restored, and the check result can provide a reference for the design of transmission lines in plateau areas and the prevention and control of wind and snow disasters.

[0037] On this basis, the structural optimization design of the transmission tower with unqualified check results is carried out, and the corresponding upgrading and transformation plan is proposed. By adjusting the structural parameters of the transmission tower, strengthening the node connection, or using new anti-icing materials, the stability and ice resistance capacity of the transmission tower in the icing environment are improved. In addition, combined with actual engineering experience, the relevant design specifications are improved to provide technical support for the long-term safe operation of the transmission tower. At the same time, considering the trend of regional climate change, the meteorological parameters are dynamically adjusted to ensure the scientific nature and forward-looking nature of the design plan. In addition, by cooperating with experts in the industry, the anti-icing design database is continuously accumulated and improved, laying a solid foundation for the subsequent maintenance and improvement of the ice resistance capacity of the transmission tower. On this basis, a systematic ice resistance capacity evaluation and optimization system is formed to adapt to the more severe future climate challenges and ensure the stable operation of the national power grid. For the check of the ice resistance capacity of the transmission tower under icing conditions, the present invention dynamically adjusts the meteorological parameters in combination with the trend of climate change and uses advanced simulation technology for structural optimization. At the same time, by cooperating with experts, the anti-icing design database is continuously improved, promoting the establishment of the ice resistance capacity evaluation and optimization system to adapt to the increasingly severe climate change challenges and ensure the stability and safety of the power grid.

[0038] Furthermore, the method for checking the ice resistance of a transmission tower further includes the following steps:

[0039] Step S1013: Construct a finite element calculation model of the transmission tower based on the structural parameters of the transmission tower, the structural parameters of the line, and the historical maximum ice thickness.

[0040] Step S1015: Apply static loads to the corresponding nodes of the finite element calculation model of the transmission tower, calculate the stress distribution of each part of the transmission tower structure, and complete the check of the static ice resistance of the transmission tower.

[0041] Step S1017: Calculate the dynamic loads on the line based on the finite element calculation model of the transmission tower.

[0042] Step S1019: Apply the dynamic loads to the corresponding nodes of the finite element calculation model of the transmission tower, calculate the stress time history curve of each part of the transmission tower structure, and complete the check of the dynamic ice resistance of the transmission tower.

[0043] Collect key structural parameters such as the dimensions, material properties, and connection methods of the transmission tower in the lofting drawing of the transmission tower. At the same time, also collect the structural parameters of the transmission line such as the length, weight, and wind load. Then, use these parameters to establish a three-dimensional model of the transmission tower in computer-aided design software. Through the finite element analysis method, the transmission tower model is divided into many small and simple elements, and each element has its own nodes. These nodes and elements together constitute the finite element model of the transmission tower, laying a foundation for subsequent load analysis and structural stress calculation.

[0044] Determine the static loads that the transmission tower may encounter during actual operation. These static loads need to be applied to the corresponding nodes of the finite element model according to the actual working conditions. Through calculation using finite element analysis software, the stress distribution diagram of the transmission tower under these static loads can be obtained. Analyzing these stress distributions can determine whether the ice resistance of the transmission tower under static conditions meets the design requirements, ensuring that the transmission tower can remain stable under extreme weather conditions. Applying dynamic loads to the finite element model and performing dynamic analysis in the time domain can obtain the stress time history curve of each part of the transmission tower structure changing with time. By analyzing these stress time history curves, the ice resistance of the transmission tower under dynamic loads can be evaluated, ensuring that the transmission tower can withstand the periodic stress changes caused by dynamic loads when encountering extreme weather such as ice storms, thus ensuring the stable operation of the transmission line.

[0045] The structural parameters of the transmission tower include the lofting drawing of the transmission tower. In step S1013, based on the finite element structural analysis software, constructing the finite element calculation model of the transmission tower specifically includes the following steps:

[0046] Step S10131: Define the intersection points of the central axes of each component in the transmission tower layout drawing as the nodes of the finite element model, and define the part between two adjacent nodes as an element.

[0047] Step S10133: Define the node types including the intersection points of main diagonal members and the intersection points of cross diagonal members.

[0048] Step S10135: Define the element types including beam elements and bar elements. Among them, define the main members and diaphragms as beam elements; define the diagonal members as bar elements.

[0049] These nodes are the basis for constructing the entire model and represent the key positions of the transmission tower structure. Between these nodes, elements are defined, which are the basic building blocks in the model and represent the connection parts between adjacent components in the transmission tower structure. The node types mainly include the intersection points of main diagonal members and the intersection points of cross diagonal members. By distinguishing these different intersection points, the force-bearing conditions and transmission paths of the transmission tower structure can be more accurately simulated. The element types are divided into beam elements and bar elements. Specifically, define the main members and diaphragms as beam elements because they play a role similar to beams in the structure and mainly bear bending and shear forces. While the diagonal members are defined as bar elements because they mainly bear tensile or compressive forces in the structure, similar to the function of bars.

[0050] Among them, taking the large commercial finite element structural analysis software ANSYS MECHANICAL in the finite element structural analysis software as an example, the model simplification and construction principles are as follows:

[0051] Nodes and elements: Define the intersection points of the central axes of each component in the transmission tower layout drawing as the nodes of the finite element model, and the element is the part between two nodes.

[0052] Definition of node types:

[0053] Intersection point of main diagonal members: It is formed by connecting plates and several high-strength bolts, with relatively large stiffness and regarded as a rigid

[0054] node;

[0055] Intersection point of cross diagonal members: Often only connected by 1 bolt. In actual engineering projects, the connection at its intersection point is far from being as reliable as in the ideal situation, and the deformation caused by external loads is also relatively small. Therefore, ignore the intersection points of diagonal members and do not consider the weak interaction between them.

[0056] Definition of element types:

[0057] The main members and diaphragms bear both axial forces and shear forces and bending moments. They are regarded as beam elements and simulated by the Beam188 element in the ANSYS element library. Each node of the element has six degrees of freedom, namely the displacements along the x, y, and z directions and the rotations about them.

[0058] The diagonal members only bear axial forces. They are regarded as truss elements and simulated by the Link8 element. Each node of the element has three degrees of freedom: the displacements in the x, y, and z directions.

[0059] The auxiliary members that do not bear forces are ignored and not regarded as elements of the transmission tower finite element model.

[0060] Furthermore, based on step S1015, static loads are applied to the corresponding nodes of the transmission tower finite element calculation model, and the stress distributions of each part of the transmission tower are calculated to complete the check of the static ice resistance of the transmission tower. The specific steps are as follows:

[0061] Step S10151: Apply the gravity field to obtain the deformation and stress distribution of the transmission tower under the action of its own weight load.

[0062] Step S10153: Apply the static load value.

[0063] Step S10155: Based on the deformation and stress distribution of the transmission tower and the static load value, the axial stress values of each main member and diagonal member of the transmission tower are solved through the transmission tower finite element calculation model.

[0064] Step S10157: If the axial stress values do not exceed the tensile strength and compressive strength of the corresponding main members and diagonal members, the check result of the static ice resistance of the transmission tower is qualified.

[0065] To evaluate the static ice resistance of the transmission tower, static loads need to be applied to the corresponding nodes of the transmission tower finite element calculation model. In this way, the stress distributions of each part of the transmission tower can be calculated. First, the gravity field is applied to simulate the deformation and stress distribution of the transmission tower under the influence of its own weight. Subsequently, the required static load values are applied, and these static load values represent various static loads that the transmission tower may encounter in the actual working environment. After obtaining the deformation and stress distribution data of the transmission tower under the action of its own weight and static loads, these data are further analyzed to solve the axial stress values of each main member and diagonal member of the transmission tower. Finally, the calculated axial stress values are compared with the tensile strength and compressive strength of the corresponding materials. If all the calculated axial stress values do not exceed the limit values of the tensile strength and compressive strength of the materials, it can be determined that the check result of the static ice resistance of the transmission tower is qualified.

[0066] In the finite element model, apply the gravity field. Use the ACEL command to apply the gravitational acceleration in the vertical direction, and obtain the deformation and stress distribution of the transmission tower under its own weight load, simulating the actual working state of the transmission tower under its own weight. Through this operation, the deformation and stress distribution of the transmission tower under its own weight load can be obtained, which is the basis for evaluating the static ice resistance ability of the transmission tower.

[0067] Among them, the EMODIFY command can be used to change the density of the angle steel to the equivalent density Deq after ice coating, and the F, NODE, Lab, and VALUE commands are used for loading. Here, Node is the node number of the wire hanging point of the transmission tower, Lab is the load direction, which can be selected from FX, FY, FZ according to the static load results obtained through specific calculations, and VALUE is the specific static load value. Use the D command to constrain all degrees of freedom of the nodes where the tower legs are connected to the transmission tower foundation, and then set the solution conditions: use the ANTYPE command to set the analysis type as static analysis; use the NLGEOM command to turn on the large deformation effect; specify the Newton - Raphson analysis of the built - in equilibrium iteration method in ANSYS to be automatic by the program. After applying the static load, it is necessary to further solve and calculate the axial stress values of each main member and diagonal member of the transmission tower based on the deformation and stress distribution of the transmission tower under its own weight and static load. These axial stress values are crucial for evaluating the structural integrity and safety of the transmission tower. Use the SOLVE command to call the ANSYS internal solver for solution, extract the axial stress of each main and diagonal member of the transmission tower in the general post - processing, and determine whether the stress value exceeds the tensile and compressive strengths of the corresponding materials such as Q235, Q345, etc. If the stress of no main or diagonal member exceeds the allowable range of the material, the result of the static ice resistance check is qualified; otherwise, it is unqualified. Thus, the structural safety of the transmission tower in the actual working environment is ensured.

[0068] Furthermore, based on step S1019, apply the dynamic load to the corresponding nodes of the transmission tower finite element calculation model, calculate the stress time - history curves of each part of the transmission tower structure, and complete the check of the dynamic ice resistance ability of the transmission tower, which specifically includes the following steps:

[0069] Step S10191: Apply the gravitational acceleration in the vertical direction.

[0070] Step S10193: Load the dynamic load value.

[0071] Step S10195: Based on the gravitational acceleration and the dynamic load value, through the transmission tower finite element calculation model, solve to obtain the axial stress time - history curves of each main member and diagonal member of the transmission tower under each ice - shedding scenario.

[0072] Step S10197: If the maximum stress value of the axial stress time history curve does not exceed the tensile strength and compressive strength of the corresponding main members and diagonal members, the dynamic anti-icing capacity check result is qualified.

[0073] Apply the gravitational acceleration in the vertical direction to the model to simulate the influence of the self-weight borne by the transmission tower in the actual working state. Subsequently, load the dynamic load value according to the actual working conditions. This step is to simulate the dynamic response of the transmission tower when subjected to ice loads. After applying the gravitational acceleration and dynamic loads, based on these dynamic loads, through the solution of the finite element analysis software, the axial stress time history curves of each main member and diagonal member of the transmission tower can be obtained for each possible ice-shedding scenario. These curves can show in detail the stress change of the structure over time. After analyzing the obtained axial stress time history curves, it is necessary to check whether the maximum stress value in the curves exceeds the limit values of the tensile strength or compressive strength of the corresponding materials. If all the calculated maximum stress values are within the allowable strength range of the materials, it can be determined that the dynamic anti-icing capacity check result of the transmission tower is qualified. On the contrary, if there is an exceeding situation, it indicates that the transmission tower may not be able to withstand the ice loads in some ice-shedding scenarios, and further structural optimization or strengthening is required.

[0074] In this embodiment, apply the gravity field. Use the ACEL command to apply the gravitational acceleration in the vertical direction, and use the F, NODE, Lab, VALUE commands for loading. Among them, Node is the node number of the wire hanging point of the transmission tower, Lab is the load direction, which can be selected from FX, FY, and FZ according to the specific calculated dynamic load result, and VALUE is the specific dynamic load value. Use the D command to constrain all degrees of freedom of the nodes where the tower legs are connected to the transmission tower foundation. Set the solution conditions as follows: use the ANTYPE command to set the analysis type as transient analysis, use the NLGEOM command to turn on the large deformation effect, and use the SOLVE command to call the ANSYS internal solver for solution. For each ice-shedding scenario, extract the axial stress time history curves of each main and diagonal member of the transmission tower in the time history post-processing, and determine whether the maximum curve stress value exceeds the tensile and compressive strengths of the corresponding materials, such as Q235, Q345, etc. If the stresses of the main and diagonal members do not exceed the allowable range of the materials, the dynamic anti-icing capacity check result is qualified; otherwise, it is unqualified.

[0075] Based on Step S1013, the line structure parameters include the span, height difference, altitude, and overhead line type connected to both sides of the transmission tower. The line meteorological parameters include the local historical maximum wind speed and the average temperature under icing conditions. The overhead line includes the conductor and the ground wire. The finite element calculation model of the transmission tower includes the finite element calculation sub-model of the overhead line. To construct the finite element calculation sub-model of the overhead line, the following steps are specifically included:

[0076] Step S10137: Based on the span, height difference, and overhead line type, combined with the catenary configuration equation, determine the geometric model of the overhead line under self-weight as follows: .

[0077] In the formula, is the vertical height of node relative to the low-hanging point of the transmission tower; is the horizontal distance of node from the low-hanging point of the transmission tower; is the horizontal distance from the lowest point of the overhead line to the low-hanging point of the transmission tower;.

[0078] Step S10139: Convert the geometric model of the overhead line into a finite element calculation sub-model of the overhead line. Among them, use the LINK10 element to simulate the overhead line, and realize the conversion from the geometric model to the finite element calculation sub-model of the overhead line by setting the density, elastic modulus, and Poisson's ratio of the element.

[0079] Furthermore, in step S1017, calculate the dynamic load on the line based on the finite element calculation model of the transmission tower, which specifically includes the following steps:

[0080] Step S10171: Set the initial strain and apply the gravitational acceleration based on the finite element calculation sub-model of the overhead line to obtain the self-weight form-finding overhead line. Among them, set the initial strain for the overhead line element and apply the gravitational acceleration, and solve statically once to complete the self-weight form-finding of the overhead line.

[0081] Step S10173: Based on the finite element calculation sub-model of the overhead line, use the equivalent density calculation formula of the overhead line to adjust the line mass density of the self-weight form-finding overhead line, with the unit of (kg / m), to obtain the configuration of the ice-covered overhead line with uniform ice thickness across the entire span under the historical maximum ice thickness. The equivalent density calculation formula of the overhead line is as follows:

[0082] .

[0083] In the formula, is the ice-covered density; is the equivalent diameter of the overhead line, is the annular equivalent ice-covered thickness, is the mass per unit length of the overhead line, is the cross-sectional area of the overhead line.

[0084] Step S10175: Simulate the crosswind time-history pulsating wind speed at the spatial nodes of the overhead line under the ice-covered overhead line configuration. Among them, use the AR linear filtering method to simulate the crosswind time-history pulsating wind speed at the spatial nodes of the overhead line under the ice-covered configuration, that is, the Von Karman spectrum, and superimpose the crosswind time-history pulsating wind speed on the historical maximum wind speed to obtain the instantaneous wind load time-history curves of different nodes as follows:

[0085] 。

[0086] In the formula, is the historical maximum wind speed, is the turbulence integral scale of the component, with a value of 80 m, is the Hertz frequency; is the crosswind pulsating wind power spectrum.

[0087] Step S10177: Based on the overhead line finite element calculation sub-model again, using the equivalent density of the overhead line, the density Deq1 of the locally iced overhead line element is changed to the density of the bare conductor before icing, realizing the process simulation after the overhead line de-ices. Here, 3 types of initial de-icing positions are mainly considered: the left end hanging point, the middle of the span, the right end hanging point, and 5 types of initial de-icing amounts: 5%, 10%, 20%, 30%, 40%, and 1 extreme case: 100% de-icing of the entire span, thus giving 16 combinations of de-icing scenarios.

[0088] Step S10179: Based on the density of the bare conductor before icing and the time history curve of the instantaneous wind load, the dynamic load is solved.

[0089] In this embodiment, all degrees of freedom at the hanging line nodes at both ends of the overhead line are constrained, and the solution conditions are set: the analysis type is set to transient analysis and the large deformation effect is turned on. The SOLVE command is used to call the ANSYS internal solver for solution, and the time history curve of the support reaction force within 60 s under the combined action of 16 de-icing scenarios and the instantaneous wind load respectively is extracted, which is the corresponding dynamic tension curve, and the dynamic load is obtained.

[0090] The static load includes the horizontal static wind load on the transmission tower nodes, the horizontal static wind load acting on the overhead line, the vertical static icing load acting on the overhead line, the icing load directly acting on the angle steel of the transmission tower, and the tension load under the action of the self-weight of the overhead line. Based on the transmission tower structure parameters and the line structure parameters, the static load acting on the nodes of the transmission tower under the given line meteorological parameters is calculated, specifically including:

[0091] The horizontal static wind load on the nodes of the transmission tower is calculated according to the following formula:

[0092] ;

[0093] In the formula, is the shape coefficient of the transmission tower, is the height at which the icing tower's windward area, is the number of segments of the entire transmission tower, is the air density. Considering the influence of altitude and ambient temperature on air properties, the calculation formula is as follows:

[0094] ;

[0095] In the formula, is the average altitude of the area where the line is located, is the average temperature under icing conditions in the area where the line is located;

[0096] is the height The maximum natural wind speed after superposition at height can be converted by the following formula:

[0097] ;

[0098] In the formula, is the wind speed at a standard height of 10 meters.

[0099] is the correction coefficient, and α is the roughness index. Both are related to the ground roughness grade. For example, the "Code for Loads on Building Structures GB50009-2001" divides the ground roughness grade into four categories: A, B, C, and D. Among them, category A refers to the offshore sea surface, islands, coasts, lake shores, deserts, etc.; category B refers to open fields, villages, jungles, hills, and small and medium-sized towns with sparse houses and the suburbs of big cities; category C refers to urban areas with dense building clusters, and category D refers to urban areas with dense building clusters and a large number of high-rise buildings. The specific values are shown in Table 1 below.

[0100] Table 1 Roughness index α and correction coefficient β

[0101] Roughness grade A B C D α 0.12 0.16 0.22 0.3 β 1.1743 1.0 0.7849 0.5639

[0102] The horizontal static wind load acting on the overhead line is calculated according to the following formula:

[0103] ;

[0104] In the formula, is the equivalent diameter of the overhead line, is the annular equivalent icing thickness, is the height of the suspension points on both sides of the overhead line, is the shape coefficient of the overhead line, which is related to the wire diameter and the annular equivalent icing thickness When is greater than or equal to 17 mm, takes 1.1; when is less than 17 mm, takes 1.2; is the equivalent diameter of the overhead line. For bundled conductors, it is the diameter of the sub-conductor multiplied by the corresponding number of bundles; is the average height of the suspension points on both sides of the overhead line, that is , is the height difference between the suspension points on both sides, is the height of the suspension point of the transmission tower relative to the foundation of the transmission tower; is the span; the meanings of other parameters are the same as before.

[0105] The vertical static ice coating load acting on the overhead line is calculated according to the following formula:

[0106] ;

[0107] In the formula, is the ice coating density. For the checking work, the maximum value of 900 kg / m3 is taken, is the span, is the local acceleration of gravity; the meanings of other parameters are the same as before.

[0108] The tension load under the dead weight of the overhead line at the node of the transmission tower is calculated according to the following formula:

[0109] ;

[0110] Tension direction: ;

[0111] The direction of the tension load can be described by the inclination angle of the overhead line at the suspension point of the transmission tower, that is, the angle between the tangent of the overhead line at the suspension point and the horizontal direction.

[0112] In the formula, is the cross-sectional area of the overhead line, is the mass per unit length of the overhead line, , are hyperbolic cosine functions, is the horizontal stress of the overhead line, is the horizontal distance from the lowest point of the overhead line to the suspension point of the transmission tower. The calculation formula is as follows;

[0113] ;

[0114] ;

[0115] In the formula, is the calculated breaking force of the overhead line, is the design safety factor of the overhead line, is the inverse hyperbolic sine function. The meanings of other parameters are the same as before.

[0116] Based on the finite element calculation model of the transmission tower, directly change the material density of the angle steel, and obtain the ice - covering load directly acting on the angle steel of the transmission tower through the equivalent density after icing, which is achieved by directly changing the material density of the angle steel. The calculation formula for the equivalent density after icing is as follows:

[0117] ;

[0118] In the formula, is the equivalent ice - covered cross - sectional area of the angle steel, is the density of the angle steel, is the cross - sectional area of the angle steel.

[0119] Taking a cup - shaped straight tower of a 110 kV overhead transmission line and its adjacent spans in a certain plateau area as an example, introduce the feasibility of the transmission tower comprehensive anti - ice ability checking method proposed by the present invention.

[0120] Step 1: Obtain the main structural parameters and meteorological parameters of the transmission tower and its line as shown in Tables 2 to 4 below.

[0121] Table 2 Structural and meteorological parameters of the transmission tower and its line

[0122]

[0123] Table 3 Parameters of conductor JL / BL14 - 240 / 55

[0124]

[0125] Table 4 Parameters of earth wire JLB14 - 80

[0126]

[0127] Step 2: Construct a truss - beam hybrid finite element calculation model of the transmission tower.

[0128] Step 3: Calculate the static wind load, ice - covering load and tension load acting on the nodes of the transmission tower under the given meteorological parameters.

[0129] Step 4: Apply the static load obtained in Step 3 to the corresponding nodes of the transmission tower finite element calculation model constructed in Step 2, and calculate the axial force distribution of each part of the transmission tower as shown in Figure 2 and Figure 3 shown.

[0130] From Figure 3It can be seen that: under the action of the self-weight load without ice coating, the points with larger tensile and compressive forces of the integral transmission tower are mainly distributed at the wire suspension points of the three-phase conductors and ground wires at the tower head, while the main members of the tower legs show the characteristics of one side being in tension and the other side being in compression. Near the suspension point of the middle-phase conductor, the axial tensile and compressive forces of the angle steel both reach the maximum. The maximum tensile force is 87387.9 N, and the maximum compressive force is -123791 N. Considering that the angle steel model at this place is L100×8 and the cross-sectional area is 15.638 mm 2 , the corresponding maximum tensile stress can be obtained as 55.88 Mpa, and the maximum compressive stress is -79.15 Mpa. Compared with the tensile or compressive strength of 215 MPa of the material itself, there is a large safety margin. Therefore, the stress distribution of the transmission tower before ice coating is within the safety range of tensile and compressive strengths.

[0131] Comparison Figure 3 and Figure 5 It can be seen that: under the action of ice coating and wind load, the axial stress distribution of the transmission tower itself has changed significantly: the unbalanced tension caused by ice coating in adjacent spans makes the tensile and compressive degrees on the front and back sides of the integral transmission tower further deepen; the difference in axial forces between the windward and leeward sides of the tower legs is further enlarged. The distribution positions of the maximum axial tensile force and maximum axial compressive force of the integral transmission tower change from the tower head to the tower legs, and the values are greatly increased compared with those before ice coating. The maximum axial tensile force reaches 335802 N, and the maximum axial compressive force reaches -346396 N. Considering that the angle steel model at the tower legs is L160×14 and the cross-sectional area is 43.296 mm 2 , the stress value of the maximum axial tensile force after ice coating reaches 36.07% of the tensile strength of the material itself, and the stress value of the maximum axial compressive force after ice coating reaches 37.21% of the compressive strength of the material itself. Both are still within the safety margin of the angle steel material. Therefore, in terms of static ice resistance, the designed values of the mechanical tensile and compressive strengths of the original transmission tower are sufficient to resist the combined load of 15 mm equivalent ice coating + historical maximum wind speed, that is, the static ice resistance check passes.

[0132] Step 5: Calculate the dynamic wind load under the given meteorological parameters and the dynamic tension caused by the ice shedding of the conductors and ground wires. The spatial configuration diagrams of the middle-phase conductor on the left side of the transmission tower before and after self-weight form-finding are as shown in Figure 4 . The dotted line represents the spatial configuration diagram before self-weight form-finding, and the solid line represents the spatial configuration diagram after self-weight form-finding.

[0133] Step 6: Apply the dynamic load calculated in Step 5 to the corresponding nodes of the transmission tower finite element calculation model constructed in Step 2, and calculate the axial force time history curves of each part of the transmission tower structure. The calculation results at 10 s after ice shedding in the scenario of 15% initial ice shedding rate + ice shedding in the middle of the span are as shown in Figure 6 .

[0134] As can be seen from Figure 6: In this ice shedding scenario, the maximum axial tension and maximum axial compression of the entire transmission tower under dynamic tension load reach the maximum, and are concentrated at the main members of the tower legs. The maximum axial tension reaches 337427 N, and the maximum axial compression reaches -347649 N. The maximum axial tension is 35.25% of the tensile strength of the material itself, still less than the tensile strength of 215 Mpa. The maximum axial compression is 37.35% of the compressive strength of the material itself, still less than the compressive strength of 215 Mpa. Therefore, the result of the dynamic ice resistance capacity check of the transmission tower in this ice shedding scenario is: Passed.

[0135] Step 7: Since the calculation results of other ice shedding scenarios in Step 6 also indicate that the results of the dynamic ice resistance capacity check of the transmission tower are all passed, combined with the results of the static ice resistance capacity check, the comprehensive ice resistance capacity check of this transmission tower is: Passed.

[0136] On the other hand, as Figure 7 shown, the present invention also proposes an electronic device, including: at least one processor 110; a memory 120 communicatively connected to the at least one processor; wherein, the memory 120 stores instructions executable by the at least one processor 110, and the instructions are executed by the at least one processor 110 to enable the at least one processor 110 to perform the following steps:

[0137] Step S101: Obtain the structural parameters of the transmission tower, the structural parameters of the line, and the meteorological parameters of the line, where the line is the line where the transmission tower is located.

[0138] Step S103: Based on the structural parameters of the transmission tower and the structural parameters of the line, calculate the static load acting on the nodes of the transmission tower under the given line meteorological parameters.

[0139] Step S105: Based on the static load, check the static ice resistance capacity of the transmission tower.

[0140] Step S107: If the static ice resistance capacity check of the transmission tower is qualified, then based on the structural parameters of the transmission tower and the structural parameters of the line, calculate the dynamic load acting on the nodes of the transmission tower under the given line meteorological parameters.

[0141] Step S109: Based on the dynamic load, check the dynamic ice resistance capacity of the transmission tower.

[0142] Step S1011: If the dynamic ice resistance capacity check of the transmission tower is qualified, then the comprehensive ice resistance capacity check of the transmission tower is qualified.

[0143] On the other hand, the present invention also proposes a computer storage medium storing a computer program, and when the computer program is executed by a processor, it implements any one of the described methods for checking the ice resistance capacity of a transmission tower.

[0144] 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 a memory, storage, database, or other medium used in the embodiments provided in this application can include non-volatile and / or volatile memories. 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 many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc. Each embodiment in this specification is described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the embodiments of the apparatus, device, and non-volatile computer storage medium, since they are basically similar to the method embodiments, the description is relatively simple. For the relevant parts, reference can be made to the partial description of the method embodiments.

[0145] The above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. The obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A method for checking the ice resistance of a transmission tower, characterized in that, Including: Obtain the structural parameters of the transmission tower, the structural parameters of the line, and the meteorological parameters of the line. The line is the line where the transmission tower is located, and the meteorological parameters of the line include the historical maximum ice thickness; Based on the structural parameters of the transmission tower, the structural parameters of the line, and the meteorological parameters of the line, calculate the static load acting on the nodes of the transmission tower. Among them, the intersection point of the central axes of each component in the transmission tower is defined as the node; Based on the static load, check the static ice resistance ability of the transmission tower; If the check of the static ice resistance ability of the transmission tower is qualified, then based on the structural parameters of the line and the historical maximum ice thickness, calculate the dynamic load acting on the line; Based on the dynamic load, check the dynamic ice resistance ability of the transmission tower; If the check of the dynamic ice resistance ability of the transmission tower is qualified, then the comprehensive ice resistance ability check of the transmission tower is qualified; Construct a finite element calculation model of the transmission tower based on the structural parameters of the transmission tower, the structural parameters of the line, and the historical maximum ice thickness. The finite element calculation model of the transmission tower includes a finite element calculation sub-model of the overhead line; Apply the static load to the corresponding nodes of the finite element calculation model of the transmission tower, and calculate the stress distribution of each part of the structure of the transmission tower to complete the check of the static ice resistance ability of the transmission tower; Calculate the dynamic load on the line based on the finite element calculation model of the transmission tower, specifically including: Based on the finite element calculation sub-model of the overhead line, set the initial strain and apply the gravitational acceleration to obtain the self-weight form-finding overhead line; Based on the finite element calculation sub-model of the overhead line, use the overhead line equivalent density calculation formula to adjust the line mass density of the self-weight form-finding overhead line to obtain the configuration of the ice-covered overhead line with uniform full-span under the historical maximum ice thickness. The overhead line equivalent density calculation formula is as follows: ； Wherein, is the ice density; is the equivalent diameter of the overhead line, is the equivalent circular ice thickness, is the mass per unit length of the overhead line, is the cross-sectional area of the overhead line; Simulate the crosswind time-history pulsating wind speed at the spatial nodes of the overhead line under the configuration of the ice-covered overhead line, and superimpose the crosswind time-history pulsating wind speed on the historical maximum wind speed to obtain the instantaneous wind load time-history curve of different nodes as follows: ； In the formula, is the historical maximum wind speed, is the integral scale of turbulence for the component, and is the power spectrum of wind pulsation in the along-wind direction; Again based on the finite element calculation sub-model of the overhead line, use the overhead line equivalent density to change the density of the locally ice-covered overhead line unit to the density of the bare conductor before icing; Based on the density of the bare conductor before icing and the instantaneous wind load time-history curve, solve to obtain the dynamic load.

2. The method for checking the ice resistance of a transmission tower according to claim 1, wherein The method further includes: Construct the finite element calculation model of the transmission tower based on the structural parameters of the transmission tower, the structural parameters of the line, and the historical maximum ice thickness; Apply the static load to the corresponding nodes of the finite element calculation model of the transmission tower, and calculate the stress distribution of each part of the structure of the transmission tower to complete the check of the static ice resistance ability of the transmission tower; Calculate the dynamic load on the line based on the finite element calculation model of the transmission tower; Apply the dynamic load to the corresponding nodes of the finite element calculation model of the transmission tower, and calculate the stress time-history curve of each part of the structure of the transmission tower to complete the check of the dynamic ice resistance ability of the transmission tower.

3. The method for checking the ice resistance of a transmission tower according to claim 2, characterized in that Apply the static load to the corresponding nodes of the finite element calculation model of the transmission tower, calculate the stress distribution of each part of the structure of the transmission tower, and complete the verification of the static ice resistance of the transmission tower, specifically including: Apply the gravity field to obtain the deformation and stress distribution of the transmission tower under the action of self-weight load; Load the static load value; Based on the deformation and stress distribution of the transmission tower and the static load value, solve the axial stress values of each main member and diagonal member of the transmission tower through the finite element calculation model of the transmission tower; If the axial stress values do not exceed the tensile strength and compressive strength of the corresponding main members and diagonal members, the verification result of the static ice resistance of the transmission tower is qualified.

4. The method for checking the anti-icing ability of a transmission tower according to claim 2, characterized in that, Apply the dynamic load to the corresponding nodes of the finite element calculation model of the transmission tower, calculate the stress time history curve of each part of the structure of the transmission tower, and complete the verification of the dynamic ice resistance of the transmission tower, specifically including: Apply the gravitational acceleration in the vertical direction; Load the dynamic load value; Based on the gravitational acceleration and the dynamic load value, solve the axial stress time history curve of each main member and diagonal member of the transmission tower under each ice shedding scenario through the finite element calculation model of the transmission tower; If the maximum stress value of the axial stress time history curve does not exceed the tensile strength and compressive strength of the corresponding main members and diagonal members, the verification result of the dynamic ice resistance is qualified.

5. The method for checking the ice resistance of a transmission tower according to claim 2, wherein The line structure parameters include the span, height difference, altitude, and overhead line type connected to both sides of the transmission tower. The line meteorological parameters also include the local historical maximum wind speed and the average temperature under icing conditions. The overhead line includes conductors and ground wires. The finite element calculation model of the transmission tower includes a finite element calculation sub-model of the overhead line. To construct the finite element calculation sub-model of the overhead line, specifically including: Based on the span, height difference, and the type of overhead line, combined with the catenary configuration equation, the geometric model of the overhead line under the action of self-weight is determined as follows: ; Wherein, is the vertical height of the node relative to the low suspension point of the transmission tower; is the node The horizontal distance from the low suspension point of the transmission tower; is the horizontal distance from the lowest point of the overhead line to the low suspension point of the transmission tower; is the horizontal stress of the overhead line, , is the calculated breaking force of the overhead line, is the cross-sectional area of the overhead line, is the design safety factor of the overhead line; is the mass per unit length of the overhead line; Convert the geometric model of the overhead line into a finite element calculation sub-model of the overhead line.

6. The method for checking the ice resistance of a transmission tower according to any one of claims 2 to 5, characterized in that, The transmission tower structure parameters include the lofting drawing of the transmission tower. To construct the finite element calculation model of the transmission tower based on finite element structural analysis software, specifically including: Define the intersection point of the central axes of each component in the transmission tower in the lofting drawing of the transmission tower as the node of the finite element model, and define the part between adjacent two nodes as the element; Define the node types including the intersection points of main and diagonal members and the intersection points of cross diagonal members; Define the element types including beam elements and rod elements. Among them, define the main members and diaphragms as the beam elements; define the diagonal members as the rod elements.

7. The method for checking the ice resistance of a transmission tower according to any one of claims 2 to 5, characterized in that, The static loads include the horizontal static wind load on the transmission tower nodes, the horizontal static wind load acting on the overhead line, the vertical static ice - coating load acting on the overhead line, the ice - coating load directly acting on the angle steel of the transmission tower, and the tension load under the action of the self - weight of the overhead line. The line structure parameters include the span, height difference, altitude, and overhead line type connected on both sides of the transmission tower. The line meteorological parameters also include the local historical maximum wind speed and the average temperature under ice - coating conditions. Based on the transmission tower structure parameters, the line structure parameters, and the line meteorological parameters, the static loads acting on the nodes of the transmission tower are calculated, specifically including: Calculate the horizontal static wind load on the nodes of the transmission tower according to the following formula: ； In the formula, is the shape coefficient of the transmission tower, is the height, is the windward area of the ice-covered tower at the height of, is the number of segments of the whole transmission tower, is the height, is the maximum natural wind speed after superposition at the height of, is the air density, and the calculation formula is as follows: ； Wherein, is the average altitude of the area where the line is located, is the average temperature under the icing condition of the area where the line is located; ； In the formula, is the wind speed at a standard height of 10 meters, is the correction coefficient, is the roughness index; Calculate the horizontal static wind load acting on the overhead line according to the following formula: ； In the formula, is the shape coefficient of the overhead line, is the equivalent diameter of the overhead line, is the equivalent circular icing thickness, is the height of the suspension points on both sides of the overhead line; Calculate the vertical static ice - coating load acting on the overhead line according to the following formula: ； In the formula, is the ice coating density, is the span, is the local acceleration of gravity; Calculate the tension load under the action of the self - weight of the overhead line on the transmission tower nodes according to the following formula: ； Tension direction: ; In the formula, is the cross-sectional area of the overhead line, is the mass per unit length of the overhead line, , is the hyperbolic cosine function, is the horizontal stress of the overhead line, is the horizontal distance from the lowest point of the overhead line to the wire hanging point of the transmission tower, and the calculation formula is as follows; ； ； In the formula, is the calculated breaking force of the overhead line, is the design safety factor of the overhead line, is the inverse hyperbolic sine function; Based on the finite - element calculation model of the transmission tower, directly change the material density of the angle steel, and obtain the ice - coating load directly acting on the angle steel of the transmission tower through the equivalent density after ice - coating. The formula for calculating the equivalent density after ice - coating is as follows: ； In the formula, is the equivalent ice-covered cross-sectional area of the angle steel, is the density of the angle steel, is the cross-sectional area of the angle steel.

8. An electronic device, characterized in that, Include: At least one processor; A memory communicatively connected to the at least one processor; Wherein, the memory stores instructions executable by the at least one processor, and when the instructions are executed by the at least one processor, the at least one processor is enabled to execute the transmission tower anti - ice capacity checking method according to any one of claims 1 to 7.

9. A computer storage medium, characterized in that, Store a computer program, and when the computer program is executed by a processor, it realizes the transmission tower anti - ice capacity checking method according to any one of claims 1 to 7.

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