Method for checking ice resistance of power transmission tower, electronic equipment and computer storage medium

Abstract

The invention discloses a power transmission tower ice-resistant capability checking method, electronic equipment and a computer storage medium. The method comprises the following steps: acquiring a power transmission tower structure parameter, a line structure parameter and a line meteorological parameter; based on the power transmission tower structure parameters, the line structure parameters and the line meteorological parameters, static load acting on the nodes of the power transmission tower is calculated; checking the static ice-resistant capability of the power transmission tower based on the static load; if the static ice-resistant capability of the power transmission tower is checked to be qualified, calculating a dynamic load acting on the line based on the line structure parameters and the historical maximum ice thickness; checking the dynamic ice-resistant capability of the power transmission tower based on the dynamic load; and if the dynamic ice-resistant capability of the power transmission tower is checked to be qualified, the comprehensive ice-resistant capability of the power transmission tower is checked to be qualified. According to the method, the influence of line icing on the stress distribution of the power transmission tower structure is considered from the two perspectives of static icing and dynamic deicing, and the checking result is more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission towers, and in particular to a method for verifying the anti-icing capability of a transmission tower, electronic equipment and a computer storage medium. Background Art

[0002] As an important component of the transmission line system, the transmission tower is an important support for overhead lines, spacers, insulator strings and other hardware. As the transmission tower is directly exposed to the atmosphere, it will be affected by rain, snow, wind and frost in the outdoor environment. Therefore, whether its structural strength can resist the erosion of the harsh environment of 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 face the serious impact of icing in extreme conditions and complex environments such as ultra-high altitudes, 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 freezing disasters in the power system. After the wires and components on the transmission tower are covered with a large amount of ice, 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 anti-icing capacity of transmission towers under icing has been studied, and the main research methods include structural tests and numerical simulations. However, the research on the method of evaluating the anti-icing capacity of transmission towers is difficult to be fed back to the upgrading and transformation of existing transmission tower structures. The transmission tower structure 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, so as to be able to check the structural strength of existing transmission towers, and then provide guidance for the subsequent upgrading and transformation of transmission towers. Summary of the invention

[0005] The purpose of the present invention is to verify the structural strength of an existing transmission tower under ice-covered conditions, thereby providing a method for verifying the ice resistance of an existing transmission tower to provide guidance for upgrading and renovating the existing transmission tower.

[0006] In order to achieve the above-mentioned purpose, the present invention proposes a method for verifying the anti-icing capacity of a transmission tower, comprising: obtaining transmission tower structural parameters, line structural parameters and line meteorological parameters, wherein the line is the line where the transmission tower is located, and the line meteorological parameters include the historical maximum ice thickness; based on the transmission tower structural parameters, the line structural parameters and the line meteorological parameters, calculating the static load acting on the node of the transmission tower, wherein the intersection of the central axes of the components in the transmission tower is defined as the node; based on the static load, verifying the static anti-icing capacity of the transmission tower; if the static anti-icing capacity of the transmission tower is verified to be qualified, then calculating the dynamic load acting on the line based on the line structural parameters and the historical maximum ice thickness; based on the dynamic load, verifying the dynamic anti-icing capacity of the transmission tower; if the dynamic anti-icing capacity of the transmission tower is verified to be qualified, then the comprehensive anti-icing capacity of the transmission tower is verified to be qualified.

[0007] In an optional embodiment, the method further includes: constructing a finite element calculation model of a 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 verification of the static anti-icing capability 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 verification of the dynamic anti-icing capability of the transmission tower.

[0008] In an optional embodiment, the static load is applied to the corresponding nodes of the finite element calculation model of the transmission tower, the stress distribution of each part of the structure of the transmission tower is calculated, and the static anti-icing ability of the transmission tower is verified, which specifically includes: applying a gravity field to obtain 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, the axial stress value of each main material and diagonal material of the transmission tower is solved by the finite element calculation model of the transmission tower; if the axial stress value does not exceed the tensile strength and compressive strength of the corresponding main material and diagonal material, the static anti-icing ability verification result of the transmission tower is qualified.

[0009] In an optional 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 the various structural parts of the transmission tower are calculated to complete the verification of the dynamic anti-icing capability of the transmission tower, specifically including: applying gravity acceleration in the vertical direction; loading the dynamic load value; based on the gravity acceleration and the dynamic load value, solving the finite element calculation model of the transmission tower to obtain the axial stress time-history curves of each main material and diagonal material of the transmission tower in 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 material and diagonal material, the dynamic anti-icing capability verification result is qualified.

[0010] In an optional implementation, the line structural parameters include the span, height difference, altitude, and overhead line model of the transmission tower on both sides; the line meteorological parameters also include the local historical maximum wind speed and the average temperature under icing conditions; the overhead line includes a conductor and a ground wire; the transmission tower finite element calculation model includes an overhead line finite element calculation sub-model; and constructing the overhead line finite element calculation sub-model specifically includes: based on the span, height difference and overhead line model, combined with the catenary configuration equation, determining the overhead line geometric model under the action of deadweight as follows: ; In the formula, For Node The vertical height relative to the lower hanging point of the transmission tower; For Node Horizontal distance from the low hanging point of the transmission tower; It is the horizontal distance from the lowest point of the overhead line to the lower hanging point of the transmission tower; The overhead line geometric model is converted into an overhead line finite element calculation sub-model.

[0011] In an optional implementation, the dynamic load on the line is calculated based on the transmission tower finite element calculation model, specifically including: setting the initial strain based on the overhead line finite element calculation sub-model and applying gravity acceleration to obtain the self-weight shape-finding overhead line, such as Figure 4 As shown; Based on the overhead line finite element calculation sub-model, the overhead line equivalent density calculation formula is adopted to adjust the line mass density of the overhead line, and the configuration of the overhead line with uniform ice coverage at all levels under the historical maximum ice thickness is obtained, wherein the overhead line equivalent density calculation formula is as follows: ; In the formula, is the ice density; is the equivalent diameter of the overhead line, is the annular equivalent ice thickness, is the mass per unit length of the overhead line, is the cross-sectional area of ​​the overhead line; The downwind time-course fluctuating wind speed at the space node of the overhead line under the ice-covered overhead line configuration is simulated, and the downwind time-course fluctuating wind speed is superimposed on the historical maximum wind speed to obtain the instantaneous wind load time-course curves of different nodes as follows: ; In the formula, The highest wind speed in history. for The turbulence integral scale of the component, is the frequency in Hertz; is the downwind fluctuating wind power spectrum; Again based on the overhead line finite element calculation sub-model, the first equivalent density calculation formula is used to change the density of the locally iced overhead line unit to the density of the bare conductor before ice coating; based on the density of the bare conductor before ice coating and the instantaneous wind load time history curve, the dynamic load is obtained.

[0012] In an optional embodiment, the transmission tower structural parameters include a transmission tower lofting diagram, and a finite element calculation model of the transmission tower is constructed based on finite element structural analysis software, specifically including: defining the intersection points of the central axes of the components in the transmission tower in the transmission tower lofting diagram as nodes of the finite element model, and defining the part between two adjacent nodes as units; defining node types including the intersection points of main diagonal materials and the intersection points of cross diagonal materials; defining unit types including beam units and rod units, wherein the main materials and cross partitions are defined as beam units; and defining diagonals as rod units.

[0013] In an optional embodiment, the static load includes a horizontal static wind load on a transmission tower node, a horizontal static wind load acting on an overhead line, a vertical static icing load acting on an overhead line, an icing load directly acting on an angle steel of the transmission tower, and a tension load under the deadweight 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, the line meteorological parameters also include the local historical maximum wind speed and the average temperature under icing conditions, and the line meteorological parameters also include the local historical maximum wind speed and the average temperature under icing conditions. Based on the transmission tower structure parameters, the line structure parameters, and the line meteorological parameters, the static load acting on the node of the transmission tower is calculated, specifically including: calculating the horizontal static wind load on the node of the transmission tower according to the following formula: ; In the formula, is the tower shape coefficient of the transmission tower, For height The windward area of ​​the ice-covered tower at is the number of segments of the transmission tower as a whole, For height The maximum natural wind speed after superposition is is the air density, calculated 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 factor, 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 ice thickness, It is the height of the hanging points on both sides of the overhead line; The vertical static ice load acting on the overhead line is calculated according to the following formula: ; In the formula, is the ice density, is the gear spacing, is the local gravitational acceleration; The tension load under the deadweight 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, , is the hyperbolic cosine function, is the horizontal stress of the overhead line, It is the horizontal distance from the lowest point of the overhead line to the hanging point of the transmission tower. 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, the material density of the angle steel is directly changed, and the ice load directly acting on the angle steel of the transmission tower is obtained through the equivalent density after ice coating, wherein the calculation formula of 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 angle steel density, 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 so that the at least one processor can execute any one of the methods for verifying the anti-icing capacity of a transmission tower.

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

[0016] The beneficial effects of the present invention are as follows: by correcting the air characteristic parameters in high-altitude areas, the wind load in a low-pressure environment can be accurately solved and applied, and the influence of line icing on the stress distribution of the transmission tower structure is considered from the two perspectives of static ice accumulation and dynamic ice shedding, and the mechanical effect of the plateau environment on the transmission tower structure is fully restored. The verification 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 A flow chart of a method for verifying the ice resistance of a transmission tower provided for the implementation of the present invention; Figure 2 A flow chart of another method for checking ice resistance of a transmission tower provided for the implementation of the present invention; Figure 3 An axial force distribution diagram of an entire transmission tower under the action of an un-iced deadweight load in a method for verifying the anti-icing capacity of a transmission tower provided in an embodiment of the present invention; Figure 4 A spatial configuration diagram of the middle phase conductor on the left side of a transmission tower before and after self-weight shape finding in a method for checking the anti-icing capacity of a transmission tower provided by an embodiment of the present invention; Figure 5 A method for checking the anti-icing capacity of a transmission tower provided in an embodiment of the present invention is provided, which is an axial force distribution diagram of the entire transmission tower under the combined static load of 15 mm ice coverage + the historical maximum wind speed; Figure 6An axial force distribution diagram of the entire transmission tower under dynamic tension load 10 seconds after deicing in a transmission tower anti-icing capacity verification method provided by an embodiment of the present invention with an initial deicing rate of 15% + mid-span deicing scenario; Figure 7 A block diagram of an electronic device provided by an embodiment of the present invention.

[0018] Description of reference numerals: 110. Processor; 120. Memory. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below through the accompanying drawings and specific embodiments.

[0020] Transmission corridors cover an increasingly wide area, and transmission lines inevitably cross various ice-covered areas with complex terrain and cold climate. In recent years, with the increasing warming of the global climate, various extreme disasters have occurred frequently, and transmission tower collapse accidents have occurred from time to time in plateau areas. The main reason is that the transmission tower structure designed under the existing specifications 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 of the new environment, check the strength of the existing transmission tower structure, and provide guidance for subsequent upgrades and renovations.

[0021] like Figure 1 and Figure 2 As shown, according to an embodiment of the present invention, on the one hand, a method for checking the ice resistance of a transmission tower is provided, comprising the following steps: Step S101: acquiring transmission tower structure parameters, line structure parameters and line meteorological parameters, where the line is where the transmission tower is located, and the line meteorological parameters include the historical maximum ice thickness.

[0022] Step S103: Based on the transmission tower structure parameters, the line structure parameters and the line meteorological parameters, the static load acting on the nodes of the transmission tower is calculated, wherein the intersection of the central axes of the components in the transmission tower is defined as the node.

[0023] Step S105: Based on the static load, the static anti-icing capability of the transmission tower is verified.

[0024] Step S107: If the static ice resistance of the transmission tower is verified to be qualified, the dynamic load acting on the line is calculated based on the line structure parameters and the historical maximum ice thickness.

[0025] Step S109: Based on the dynamic load, the dynamic anti-icing capability of the transmission tower is verified.

[0026] Step S1011: If the dynamic anti-icing capability of the transmission tower is checked to be qualified, then the comprehensive anti-icing capability of the transmission tower is checked to be qualified.

[0027] Transmission towers are usually iron towers. The structural parameters of transmission towers are mainly transmission tower layout drawings, which contain detailed dimensions of each part of the transmission tower and the corresponding angle steel models. These parameters are crucial to the design and manufacture of transmission towers, ensuring the structural strength and stability of transmission towers. Line structural parameters mainly include the span, height difference, altitude, conductor model and ground wire model of the two sides of the transmission tower. The span refers to the distance between adjacent transmission towers, the height difference refers to the vertical height difference between transmission towers, and the altitude refers to the geographical height of the location of the transmission tower. The conductor model and ground wire model are directly related to the transmission efficiency and safety of the transmission line. The meteorological parameters of the line mainly include the local historical maximum wind speed, the maximum ice thickness and the average temperature under icing conditions. These meteorological parameters are crucial to evaluating the performance of transmission lines under extreme weather conditions because they affect the stability and safety of the line.

[0028] On the basis of the static load, the static anti-icing capacity of the transmission tower is verified to ensure that the transmission tower can withstand the additional pressure caused by the ice load 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 anti-icing capacity of the transmission tower is also confirmed to be qualified, it can be concluded that the comprehensive anti-icing 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 perspectives of static ice accumulation and dynamic ice shedding, the mechanical effect of the environment on the transmission tower structure is fully restored, and the verification results can provide a reference for the design of transmission lines and the prevention and control of wind and snow disasters in plateau areas.

[0029] On this basis, the transmission towers that failed the verification are optimized and designed, and corresponding upgrading and transformation plans are proposed. By adjusting the structural parameters of the transmission tower, strengthening the node connection, or adopting new anti-icing materials, the stability and anti-icing ability of the transmission tower in an icing environment can be improved. In addition, combined with actual engineering experience, the relevant design specifications are improved to provide technical guarantees 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 scientificity and foresight of the design scheme. In addition, through cooperation with experts in the industry, the anti-icing design database is continuously accumulated and improved, laying a solid foundation for the subsequent maintenance and anti-icing ability of the transmission tower. On this basis, a set of systematic anti-icing ability evaluation and optimization system is formed to adapt to more severe climate challenges in the future and ensure the stable operation of the national power grid. For the anti-icing ability verification of the transmission tower under icing conditions, the present invention combines the trend of climate change, dynamically adjusts the meteorological parameters, and uses advanced simulation technology for structural optimization. At the same time, through cooperation with experts, we will continuously improve the ice-resistant design database and promote the establishment of an ice-resistant capability assessment and optimization system to adapt to the increasingly severe challenges of climate change and ensure the stability and security of the power grid.

[0030] Furthermore, the method for checking the anti-icing capability of a transmission tower further includes the following steps: Step S1013: constructing a transmission tower finite element calculation model based on the transmission tower structure parameters, line structure parameters and the historical maximum ice thickness.

[0031] Step S1015: applying static loads to corresponding nodes of the finite element calculation model of the transmission tower, calculating the stress distribution of each part of the transmission tower structure, and completing the verification of the static anti-icing capability of the transmission tower.

[0032] Step S1017: Calculate the dynamic load on the line based on the finite element calculation model of the transmission tower.

[0033] Step S1019: applying dynamic loads to corresponding nodes of the finite element calculation model of the transmission tower, calculating stress time history curves of various structural parts of the transmission tower, and completing the verification of the dynamic anti-icing capability of the transmission tower.

[0034] Collect the key structural parameters of the transmission tower in the transmission tower lofting diagram, such as the size, material properties, and connection methods. At the same time, collect the line structural parameters such as the length, weight, and wind load of the transmission line. Then, use these parameters to build a three-dimensional model of the transmission tower in the computer-aided design software. Through the finite element analysis method, the transmission tower model is divided into many small, simple units, each with its own nodes. These nodes and units together constitute the finite element model of the transmission tower, laying the foundation for subsequent load analysis and structural stress calculation.

[0035] Determine the static loads that the transmission tower may encounter in 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 the calculation of the finite element analysis software, the stress distribution diagram of the transmission tower under these static loads can be obtained. By analyzing these stress distributions, it can be determined whether the anti-ice ability 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 curves of the various parts of the transmission tower structure over time. By analyzing these stress time history curves, the anti-ice ability 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, thereby ensuring the stable operation of the transmission line.

[0036] The transmission tower structural parameters include a transmission tower lofting diagram. In step S1013, a transmission tower finite element calculation model is constructed based on finite element structural analysis software, which specifically includes the following steps: Step S10131: The intersection points of the central axes of the components in the transmission tower in the transmission tower layout diagram are defined as nodes of the finite element model, and the part between two adjacent nodes is defined as a unit.

[0037] Step S10133: define the node types including the intersection points of the main diagonal materials and the intersection points of the cross diagonal materials.

[0038] Step S10135: define unit types including beam units and rod units, wherein the main material and the cross partition are defined as beam units; and the diagonal is defined as a rod unit.

[0039] These nodes are the basis for building the entire model and represent the key locations of the transmission tower structure. Between these nodes, elements are defined, which are the basic building blocks in the model, and they represent the connection parts between adjacent components in the transmission tower structure. The node types mainly include the intersection points of the main diagonal materials and the intersection points of the cross diagonal materials. By distinguishing these different intersections, the force conditions and transmission paths of the transmission tower structure can be simulated more accurately. The element types are divided into beam elements and rod elements. Specifically, the main materials and cross diaphragms are defined as beam elements because they play a similar role to beams in the structure, mainly bearing bending and shear forces. The diagonal materials are defined as rod elements because they mainly bear tension or pressure in the structure, similar to the function of rods.

[0040] Among them, taking ANSYS MECHANICAL, a large-scale commercial finite element structural analysis software, as an example, the model simplification and construction principles are as follows: Nodes and units: The intersection of the central axes of the components in the transmission tower in the lofting diagram is defined as the node of the finite element model, and the unit is the part between the two nodes.

[0041] Node type definition: The intersection of the main diagonal material: It is connected by a connecting plate and several high-strength bolts, with high rigidity, and is considered rigid. node; The intersection of the cross-slope materials: Often only one bolt is used for connection. In actual engineering projects, the connection at the intersection is far less reliable than ideal, and the deformation caused by external loads is relatively small. Therefore, the intersection of the cross-slope materials is ignored and the weak interaction between them is not considered.

[0042] Unit type definition: The main material and the cross partition bear not only axial force but also shear force and bending moment. They are regarded as beam units and simulated by the Beam188 unit in the ANSYS unit library. Each node of the unit has 6 degrees of freedom, which are displacement along the x, y and z directions and rotation around them.

[0043] The oblique material only bears axial force and is regarded as a rod element. It is simulated using Link8 elements. Each node of the element has three degrees of freedom: displacement in the x, y and z directions.

[0044] Auxiliary materials that do not bear the force are ignored and are not considered as elements of the finite element model of the transmission tower.

[0045] Further, based on step S1015, static loads are applied to corresponding nodes of the finite element calculation model of the transmission tower, stress distribution of various parts of the transmission tower structure is calculated, and verification of the static anti-icing capability of the transmission tower is completed, which specifically includes the following steps: Step S10151: Apply a gravity field to obtain the deformation and stress distribution of the transmission tower under the action of its own weight load.

[0046] Step S10153: Load the static load value.

[0047] Step S10155: Based on the deformation and stress distribution of the transmission tower and the static load value, the axial stress value of each main material and diagonal material of the transmission tower is obtained by solving the transmission tower finite element calculation model.

[0048] Step S10157: If the axial stress value does not exceed the tensile strength and compressive strength of the corresponding main material and diagonal material, the static ice resistance verification result of the transmission tower is qualified.

[0049] In order to evaluate the static anti-icing capacity of the transmission tower, it is necessary to apply static loads to the corresponding nodes of the finite element calculation model of the transmission tower. In this way, the stress distribution of each part of the transmission tower structure can be calculated. First, a 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 loaded, which represent the 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 load, these data are further analyzed to solve the axial stress value of each main material and diagonal material of the transmission tower. Finally, the calculated axial stress value is compared with the tensile strength and compressive strength of the corresponding material. If all the calculated axial stress values ​​do not exceed the limit values ​​of the tensile strength and compressive strength of the material, the static anti-icing capacity verification result of the transmission tower can be judged to be qualified.

[0050] Apply a gravity field to the finite element model, use the ACEL command to apply vertical gravity acceleration, obtain the deformation and stress distribution of the transmission tower under the deadweight load, and simulate the actual working state of the transmission tower under the deadweight load. Through this operation, the deformation and stress distribution of the transmission tower under the deadweight load can be obtained, which is the basis for evaluating the static anti-icing capacity of the transmission tower.

[0051] Among them, the EMODIFY command can be used to change the angle steel density to the equivalent density Deq after ice coating, and the F, NODE, Lab, VALUE commands can be used for loading, where Node is the node number of the transmission tower hanging point, Lab is the load direction, and 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. The D command is used to constrain all degrees of freedom of the nodes connecting the tower leg and the transmission tower foundation, and then the solution conditions are set: the ANTYPE command is used to set the analysis type to static analysis; the NLGEOM command is used to turn on the large deformation effect; and the ANSYS built-in equilibrium iteration method Newton-Raphson analysis is specified as program automatic. After the static load is applied, it is necessary to further solve and calculate the axial stress value of each main material and diagonal material of the transmission tower based on the deformation and stress distribution of the transmission tower under the action of its own weight and static load. These axial stress values ​​are crucial for evaluating the structural integrity and safety of the transmission tower. The SOLVE command is used to call the ANSYS internal solver for solving. The axial stress of each main and diagonal material of the transmission tower is extracted in the general post-processing, and it is determined whether the stress value exceeds the tensile and compressive strength of the corresponding materials, such as Q235 and Q345. If the stress of the main and diagonal materials does not exceed the allowable range of the material, the static anti-icing capacity verification result is qualified; otherwise, it is unqualified. This ensures the structural safety of the transmission tower in the actual working environment.

[0052] Further, based on step S1019, the dynamic load is applied to the corresponding nodes of the finite element calculation model of the transmission tower, the stress time history curves of the various parts of the transmission tower structure are calculated, and the dynamic anti-icing capacity of the transmission tower is verified, which specifically includes the following steps: Step S10191: Apply gravity acceleration in the vertical direction.

[0053] Step S10193: Load the dynamic load value.

[0054] Step S10195: Based on the gravitational acceleration and the dynamic load value, the finite element calculation model of the transmission tower is used to solve the axial stress time history curve of each main material and diagonal material of the transmission tower in each deicing scenario.

[0055] 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 material and diagonal material, the dynamic anti-icing capacity verification result is qualified.

[0056] The vertical gravity acceleration is applied to the model to simulate the influence of the deadweight of the transmission tower in the actual working state. Subsequently, the dynamic load value is loaded according to the actual working conditions. This step is to simulate the dynamic response of the transmission tower when subjected to ice load. After applying the gravity acceleration and dynamic load, based on these dynamic loads, the axial stress time history curves of each main material and diagonal material of the transmission tower in each possible deicing scenario can be obtained by solving the finite element analysis software. These curves can show the stress changes of the structure in time series in detail. After analyzing the obtained axial stress time history curve, it is necessary to check whether the maximum stress value in the curve exceeds the limit value of the tensile strength or compressive strength of the corresponding material. If all the calculated maximum stress values ​​are within the allowable strength range of the material, it can be determined that the dynamic anti-icing capacity verification result of the transmission tower is qualified. On the contrary, if there is an excess, it means that the transmission tower may not be able to withstand the ice load in some deicing scenarios, and further structural optimization or reinforcement is required.

[0057] In this embodiment, a gravity field is applied, and the vertical gravity acceleration is applied by ACEL command, and loading is performed by F, NODE, Lab, VALUE command, where Node is the node number of the transmission tower hanging point, Lab is the load direction, which can be selected from FX, FY and FZ according to the specific calculated dynamic load results, and VALUE is the specific dynamic load value. The D command is used to constrain all degrees of freedom of the nodes connecting the tower leg and the transmission tower foundation, and the solution conditions are set as follows: the ANTYPE command is used to set the analysis type to transient analysis, the NLGEOM command is used to open the large deformation effect, and the SOLVE command is used to call the ANSYS internal solver for solution. For each deicing scenario, the axial stress time history curve of each main and oblique material of the transmission tower is extracted in the time history post-processing, and it is determined whether the maximum stress of the curve exceeds the tensile and compressive strength of the corresponding material, such as Q235, Q345, etc. If the stress of no main and oblique material exceeds the allowable range of the material, the dynamic anti-icing capacity verification result is qualified; otherwise, it is unqualified.

[0058] Based on step S1013, the line structural parameters include the span, height difference, altitude, and overhead line model of the transmission towers on both sides; 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 transmission tower finite element calculation model includes the overhead line finite element calculation sub-model; and constructing the overhead line finite element calculation sub-model specifically includes the following steps: Step S10137: Based on the span, height difference and overhead line model, combined with the catenary configuration equation, the geometric model of the overhead line under the action of deadweight is determined as follows: ; In the formula, For Node The vertical height relative to the lower hanging point of the transmission tower; For Node Horizontal distance from the low hanging point of the transmission tower; It is the horizontal distance from the lowest point of the overhead line to the lowest hanging point of the transmission tower.

[0059] Step S10139: Convert the overhead line geometric model into an overhead line finite element calculation sub-model, wherein the overhead line is simulated using LINK10 units, and the conversion of the geometric model into the overhead line finite element calculation sub-model is achieved by setting the unit density, elastic modulus and Poisson's ratio.

[0060] Furthermore, step S1017, calculating the dynamic load on the line based on the transmission tower finite element calculation model, specifically includes the following steps: Step S10171: Initial strain is set based on the overhead line finite element calculation sub-model and gravity acceleration is applied to obtain the self-weight form-finding overhead line. The initial strain is set for the overhead line unit and gravity acceleration is applied, and the static solution is performed once to complete the self-weight form-finding of the overhead line.

[0061] Step S10173: Based on the overhead line finite element calculation sub-model, the overhead line equivalent density calculation formula is used to adjust the line mass density of the overhead line, the unit is (kg / m), and the configuration of the overhead line with uniform ice coverage at all levels under the historical maximum ice thickness is obtained, wherein the overhead line equivalent density calculation formula is as follows: ; In the formula, is the ice density; is the equivalent diameter of the overhead line, is the annular equivalent ice thickness, is the mass per unit length of the overhead line, is the cross-sectional area of ​​the overhead line.

[0062] Step S10175: Simulate the downwind time-course fluctuating wind speed at the space nodes of the overhead line under the ice-covered overhead line configuration, wherein the AR linear filtering method is used to simulate the downwind time-course fluctuating wind speed at the space nodes of the overhead line under the ice-covered configuration, that is, the Von Karman spectrum, and the downwind time-course fluctuating wind speed is superimposed on the historical maximum wind speed to obtain the instantaneous wind load time-course curves of different nodes as follows: ; In the formula, The highest wind speed in history. for The turbulence integral scale of the component is taken as 80 meters. is the frequency in Hertz; is the downwind fluctuating wind power spectrum.

[0063] Step S10177: Based on the overhead line finite element calculation sub-model again, the overhead line equivalent density is adopted to change the density Deq1 of the locally iced overhead line unit to the density of the bare conductor before ice covering, thereby realizing the process simulation of the overhead line after deicing. Here, three types of initial deicing positions are mainly considered: the left end hanging point, the middle of the span, the right end hanging point and five initial deicing amounts: 5%, 10%, 20%, 30%, 40%, and one extreme case: 100% deicing in all gears, and then 16 deicing scene combinations are given.

[0064] Step S10179: Based on the density of the bare conductor before ice coating and the instantaneous wind load time history curve, the dynamic load is solved.

[0065] In this embodiment, all degrees of freedom at the hanging 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 support reaction time history curves within 60 seconds under the combined action of 16 deicing scenarios and instantaneous wind loads are extracted, which are the corresponding dynamic tension curves, and the dynamic load is obtained.

[0066] The static loads include horizontal static wind loads on the transmission tower nodes, horizontal static wind loads acting on overhead lines, vertical static icing loads acting on overhead lines, icing loads acting directly on the angle steel of the transmission tower, and tension loads under the deadweight of the overhead lines. Based on the transmission tower structure parameters and line structure parameters, the static loads acting on the nodes of the transmission tower under given line meteorological parameters are calculated, including: The horizontal static wind load on the nodes of the transmission tower is calculated according to the following formula: ; In the formula, is the tower shape coefficient of the transmission tower, For height The windward area of ​​the ice-covered tower at is the number of segments of the transmission tower as a whole, is the air density. Considering the influence of altitude and ambient temperature on air characteristics, 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; For height The maximum natural wind speed after superposition can be converted by the following formula: ; In the formula, is the wind speed at a standard height of 10 meters, is the correction coefficient, α is the roughness index, and both are related to the ground roughness grade. For example, GB50009-2001 Code for Loads on Building Structures divides the ground roughness grade into four categories: A, B, C, and D. Category A refers to offshore sea surfaces, islands, coasts, lake shores, and deserts; Category B refers to open fields, villages, jungles, hills, and small and medium-sized towns with relatively sparse houses and suburbs of large cities; Category C refers to urban areas with densely packed buildings; and Category D refers to urban areas of large cities with densely packed buildings and a large number of high-rise buildings. The specific values ​​are shown in Table 1 below.

[0067] Table 1 Roughness index α and correction factor β

[0068] The horizontal static wind load acting on the overhead line is calculated according to the following formula: ; In the formula, is the equivalent diameter of the overhead line, is the annular equivalent ice thickness, is the height of the hanging points on both sides of the overhead line, is the shape factor of the overhead line, which is related to the diameter of the overhead line and annular equivalent ice thickness About, when When it is greater than or equal to 17 mm, Take 1.1; when When it is less than 17 mm, Take 1.2; is the equivalent diameter of the overhead line. For split conductors, it is the diameter of the sub-conductor multiplied by the corresponding number of splits; Take the average height of the hanging points on both sides of the overhead line: , is the height difference of the hanging points on both sides, It is the height of the transmission tower hanging point relative to the transmission tower foundation; is the gear distance; other parameters have the same meaning as before.

[0069] The vertical static ice load acting on the overhead line is calculated according to the following formula: ; In the formula, is the ice density. For calibration work, the maximum value is 900 kg / m3. is the gear spacing, is the local gravitational acceleration; other parameters have the same meanings as before.

[0070] The tension load under the deadweight of the overhead line at the transmission tower node is calculated according to the following formula: ; Tension direction: ; The direction of the tension load can be determined by the inclination angle of the overhead line at the point where the transmission tower is hung. , that is, the angle between the tangent of the overhead line at the suspension point and the horizontal direction.

[0071] 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, It is the horizontal distance from the lowest point of the overhead line to the hanging point of the transmission tower. 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, and other parameters have the same meanings as before.

[0072] Based on the finite element calculation model of the transmission tower, the material density of the angle steel is directly changed. The ice load directly acting on the angle steel of the transmission tower is obtained through the equivalent density after ice coating. This is achieved by directly changing the material density of the angle steel. The calculation formula of 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 angle steel density, is the cross-sectional area of ​​the angle steel.

[0073] Taking a wine glass straight tower and its adjacent sections of a 110kV overhead transmission line in a certain plateau area as an example, the feasibility of the comprehensive anti-icing capacity verification method of the transmission tower proposed in the present invention is introduced.

[0074] 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.

[0075] Table 2 Transmission tower and its line structure and meteorological parameters

[0076] Table 3 Parameters of wire JL / BL14-240 / 55

[0077] Table 4 Ground wire JLB14-80 parameters

[0078] Step 2: Construct a truss-beam hybrid finite element calculation model of the transmission tower.

[0079] Step 3: Calculate the static wind load, ice load and tension load acting on the transmission tower nodes under given meteorological parameters.

[0080] Step 4: Apply the static load obtained by step 3 to the corresponding nodes of the finite element calculation model of the transmission tower constructed in step 2, and calculate the axial force distribution of each part of the transmission tower structure as follows: Figure 2 and Figure 3 shown.

[0081] from Figure 3 It can be seen that under the action of the un-iced deadweight load, the points with greater tension and compression on the entire transmission tower are mainly distributed at the hanging points of the three-phase conductors and the ground wire at the tower head, while the main material of the tower leg shows the characteristics of tension on one side and compression on the other side. Near the hanging point of the middle-phase conductor, the axial tension and pressure of the angle steel are both the largest, with the maximum tension being 87387.9N and the maximum pressure being -123791N. Considering that the angle steel model at this location is L100×8, with a cross-sectional area of ​​15.638mm 2 The corresponding maximum tensile stress is 55.88Mpa and the maximum compressive stress is -79.15Mpa, which has a larger safety margin compared with the tensile or compressive strength of the material itself of 215MPa. Therefore, the stress distribution of the transmission tower before ice coating is within the safe range of tensile and compressive strength.

[0082] contrast Figure 3 and 5 It can be seen that under the action of ice and wind load, the axial stress distribution of the transmission tower itself has changed significantly: the unbalanced tension caused by ice on adjacent sections has further deepened the tension and compression on the front and rear sides of the entire transmission tower; the difference in axial force between the tower legs and the leeward side has further widened. The maximum axial tension and maximum axial pressure distribution position of the entire transmission tower has changed from the tower head to the tower leg, and the values ​​have been greatly improved compared to before ice covering. The maximum axial tension has reached 335802N, and the maximum axial pressure has reached -346396N. Considering that the angle steel model at the tower leg is L160×14, with a cross-sectional area of ​​43.296mm 2 The stress value of the maximum axial tensile force after ice covering reaches 36.07% of the tensile strength of the material itself, and the stress value of the maximum axial pressure after ice covering reaches 37.21% of the compressive strength of the material itself, both of which are still within the safety margin of the angle steel material. Therefore, in terms of static anti-icing capability, the design values ​​of the mechanical tensile and compressive strengths of the original transmission tower are sufficient to withstand the combined load of 15 mm equivalent ice covering + the historical maximum wind speed, that is, the static anti-icing capability verification has passed.

[0083] Step 5: Calculate the dynamic wind load and the dynamic tension caused by the deicing of the conductor and ground wire under given meteorological parameters. The spatial configuration diagram of the middle phase conductor on the left side of the transmission tower before and after self-weight shape finding is as follows: Figure 4 As shown, the dotted line represents the spatial configuration diagram before self-weight shape finding, and the solid line represents the spatial configuration diagram after self-weight shape finding.

[0084] Step 6: Apply the dynamic load calculated in step 5 to the corresponding nodes of the finite element calculation model of the transmission tower constructed in step 2, and calculate the axial force time history curve of each part of the transmission tower structure. The calculation results of the initial deicing rate of 15% + deicing for 10s in the middle deicing scenario of the span are as follows: Figure 6 shown.

[0085] It can be seen from Figure 6 that: in this de-icing scenario, the maximum axial tension and axial pressure of the entire transmission tower under the action of dynamic tension load reach the maximum, and are concentrated in the main material of the tower leg. The maximum axial tension reaches 337427N, and the maximum axial pressure reaches -347649N. The maximum axial tension is 35.25% of the tensile strength of the material itself, which is still less than the tensile strength of 215Mpa. The maximum axial pressure is 37.35% of the compressive strength of the material itself, which is still less than the compressive strength of 215Mpa. Therefore, the dynamic anti-icing capacity verification result of the transmission tower in this de-icing scenario is: passed.

[0086] Step 7: Since the calculation results of other de-icing scenarios in step 6 also show that the dynamic anti-icing capacity verification results of the transmission tower are all passed, combined with the static anti-icing capacity verification results, the comprehensive anti-icing capacity verification of the base transmission tower is: passed.

[0087] On the other hand, Figure 7 As shown, the present invention also proposes an electronic device, comprising: at least one processor 110; a memory 120 connected to the at least one processor in communication; 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, so that the at least one processor 110 can perform the following steps: Step S101: acquiring transmission tower structural parameters, line structural parameters and line meteorological parameters, where the line is the line where the transmission tower is located.

[0088] Step S103: 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.

[0089] Step S105: Based on the static load, the static anti-icing capability of the transmission tower is verified.

[0090] Step S107: If the static anti-icing capability of the transmission tower is qualified, the dynamic load acting on the nodes of the transmission tower under given line meteorological parameters is calculated based on the transmission tower structure parameters and the line structure parameters.

[0091] Step S109: Based on the dynamic load, the dynamic anti-icing capability of the transmission tower is verified.

[0092] Step S1011: If the dynamic anti-icing capability of the transmission tower is checked to be qualified, then the comprehensive anti-icing capability of the transmission tower is checked to be qualified.

[0093] On the other hand, the present invention further proposes a computer storage medium storing a computer program, which, when executed by a processor, implements any one of the methods for verifying the anti-icing capacity of a transmission tower.

[0094] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing related hardware through a computer program, and 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 may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data 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). The various embodiments in this specification are described in a progressive manner, and the same and similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device, equipment, and non-volatile computer storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0095] The above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled 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 methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A method for checking the ice resistance of a transmission tower, characterized in that: include: Acquire 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; Based on the transmission tower structure parameters, the line structure parameters and the line meteorological parameters, a static load acting on a node of the transmission tower is calculated, wherein the intersection of the central axes of the components in the transmission tower is defined as a node; Based on the static load, checking the static anti-icing capability of the transmission tower; If the static ice resistance of the transmission tower is verified to be qualified, the dynamic load acting on the line is calculated based on the line structural parameters and the historical maximum ice thickness; Based on the dynamic load, checking the dynamic anti-icing capability of the transmission tower; If the dynamic anti-icing capability verification of the transmission tower is qualified, the comprehensive anti-icing capability verification of the transmission tower is qualified.

2. The method for checking the anti-icing capability of a transmission tower according to claim 1, characterized in that: The method further comprises: Constructing a finite element calculation model of a transmission tower based on the transmission tower structural parameters, the line structural parameters 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 transmission tower structure, and completing the verification of the static anti-icing capacity of the transmission tower; Calculating the dynamic load on the line based on the finite element calculation model of the transmission tower; The dynamic load is applied to the corresponding nodes of the finite element calculation model of the transmission tower, the stress time history curves of the various parts of the transmission tower structure are calculated, and the dynamic anti-icing capability of the transmission tower is verified.

3. The method for checking the anti-icing capability of a transmission tower according to claim 2, characterized in that: 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 transmission tower structure, and completing the verification of the static anti-icing capability of the transmission tower, specifically includes: Apply gravity field to obtain the deformation and stress distribution of transmission tower under self-weight load; Apply static load value; Based on the deformation and stress distribution of the transmission tower and the static load value, the axial stress value of each main material and diagonal material of the transmission tower is obtained by solving the finite element calculation model of the transmission tower; If the axial stress value does not exceed the tensile strength and compressive strength of the corresponding main material and diagonal material, the static ice resistance verification result of the transmission tower is qualified.

4. The method for checking the anti-icing capability of a transmission tower according to claim 2, characterized in that: Applying the dynamic load to the corresponding nodes of the finite element calculation model of the transmission tower, calculating the stress time history curves of the various parts of the transmission tower structure, and completing the verification of the dynamic anti-icing capability of the transmission tower, specifically includes: Apply vertical gravitational acceleration; Load dynamic load value; Based on the gravitational acceleration and the dynamic load value, the axial stress time history curve of each main material and diagonal material of the transmission tower in each deicing scenario is obtained by solving 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 material and diagonal material, the dynamic ice resistance verification result is qualified.

5. The method for checking the anti-icing capability of a transmission tower according to claim 2 is characterized in that: The line structural parameters include the span, height difference, altitude, and overhead line model of the transmission towers on both sides; the line meteorological parameters also include the local historical maximum wind speed and the average temperature under icing conditions; the overhead line includes a conductor and a ground wire; the transmission tower finite element calculation model includes an overhead line finite element calculation sub-model; and constructing the overhead line finite element calculation sub-model specifically includes: Based on the span, height difference and overhead line model, combined with the catenary configuration equation, the geometric model of the overhead line under the action of deadweight is determined as follows: ; In the formula, For Node The vertical height relative to the lower hanging point of the transmission tower; For Node Horizontal distance from the low hanging point of the transmission tower; It is the horizontal distance from the lowest point of the overhead line to the lower hanging point of the transmission tower; The overhead line geometric model is converted into an overhead line finite element calculation sub-model.

6. The method for checking the anti-icing capability of a transmission tower according to claim 5 is characterized in that: Calculating the dynamic load on the line based on the transmission tower finite element calculation model specifically includes: Based on the overhead line finite element calculation sub-model, initial strain is set and gravity acceleration is applied to obtain a self-weight form-finding overhead line; Based on the overhead line finite element calculation sub-model, the overhead line equivalent density calculation formula is adopted to adjust the line mass density of the overhead line, and the configuration of the overhead line with uniform ice coverage at all levels under the historical maximum ice thickness is obtained. The overhead line equivalent density calculation formula is as follows: ； In the formula, is the ice density; is the equivalent diameter of the overhead line, is the annular equivalent ice thickness, is the mass per unit length of the overhead line, is the cross-sectional area of ​​the overhead line; The downwind time-course fluctuating wind speed at the space node of the overhead line under the ice-covered overhead line configuration is simulated, and the downwind time-course fluctuating wind speed is superimposed on the historical maximum wind speed to obtain the instantaneous wind load time-course curves of different nodes as follows: ； In the formula, The highest wind speed in history. for The turbulence integral scale of the component, is the frequency in Hertz; is the downwind fluctuating wind power spectrum; Based on the overhead line finite element calculation sub-model again, the density of the partially iced overhead line unit is changed to the density of the bare conductor before ice coating by using the overhead line equivalent density; The dynamic load is obtained by solving the problem based on the density of the bare wire before ice coating and the instantaneous wind load time history curve.

7. The method for checking the anti-icing capability of a transmission tower according to any one of claims 2 to 6, characterized in that: The transmission tower structural parameters include a transmission tower lofting diagram, and a finite element calculation model of the transmission tower is constructed based on finite element structural analysis software, specifically including: The intersection of the central axes of the components in the transmission tower in the transmission tower lofting diagram is defined as a node of the finite element model, and the portion between two adjacent nodes is defined as a unit; The node types are defined including the intersection of main diagonal materials and the intersection of cross diagonal materials; The defined unit types include beam units and rod units, wherein the main material and the cross partition material are defined as the beam unit; and the diagonal material is defined as the rod unit.

8. The method for checking the anti-icing capability of a transmission tower according to any one of claims 2 to 6, characterized in that: The static loads include horizontal static wind loads on the nodes of the transmission tower, horizontal static wind loads acting on the overhead lines, vertical static icing loads acting on the overhead lines, icing loads acting directly on the angle steel of the transmission tower, and tension loads under the deadweight of the overhead lines. The line structural parameters include the span, height difference, altitude, and overhead line model of the two 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 line meteorological parameters also include the local historical maximum wind speed and the average temperature under icing conditions. Based on the transmission tower structural parameters, the line structural parameters, and the line meteorological parameters, the static loads acting on the nodes of the transmission tower are calculated, specifically including: The horizontal static wind load on the node of the transmission tower is calculated according to the following formula: ； In the formula, is the tower shape coefficient of the transmission tower, For height The windward area of ​​the ice-covered tower at is the number of segments of the transmission tower as a whole, For height The maximum natural wind speed after superposition is is the air density, calculated 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 factor, 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 ice thickness, It is the height of the hanging points on both sides of the overhead line; The vertical static ice load acting on the overhead line is calculated according to the following formula: ； In the formula, is the ice density, is the gear distance, is the local gravitational acceleration; The tension load under the deadweight 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, , is the hyperbolic cosine function, is the horizontal stress of the overhead line, It 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, the material density of the angle steel is directly changed, and the ice load directly acting on the angle steel of the transmission tower is obtained through the equivalent density after ice coating, wherein the calculation formula of 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 angle steel density, is the cross-sectional area of ​​the angle steel.

9. An electronic device, characterized in that: include: at least one processor; a memory communicatively coupled to the at least one processor; The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method for verifying the ice resistance of a transmission tower as described in any one of claims 1 to 8.

10. A computer storage medium, characterized in that: A computer program is stored, and when the computer program is executed by a processor, a method for checking the ice resistance of a transmission tower according to any one of claims 1 to 8 is implemented.

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