Method, device and equipment for evaluating reliability of power transmission tower under wind-sand load and medium

Abstract

The invention discloses a power transmission tower reliability evaluation method, device, equipment and medium under a wind sand load, and the method comprises the steps: obtaining the wind speed distribution condition and the relation between the wind speed and the sand mass density according to the meteorological data of an area where a target power transmission tower is located; according to the wind speed distribution condition, the relation between the wind speed and the sand grain mass density and the structure parameters of the target power transmission tower, generating a pure wind load and a wind-driven sand collision load, and further obtaining a wind sand load; performing dynamic response analysis on the target power transmission tower by adopting a power transmission tower structure finite element analysis model based on the wind and sand load, and determining the structure failure probability of the target power transmission tower under the action of the wind and sand load based on an analysis result; and calculating the structural reliability of the target power transmission tower according to the structural failure probability and the wind speed distribution condition of the target power transmission tower. According to the method, reliability evaluation can be performed on the power transmission tower under the wind-sand load effect, and an effective reference is provided for enhancing the wind-sand resistance of a power transmission tower line system.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission tower structure design, and in particular to a reliability evaluation method, device, equipment and medium for a transmission tower under wind and sand load. Background Art

[0002] With the construction of large energy bases in the northwest, more and more transmission towers and lines in deserts, wastelands and Gobi areas are directly exposed to severe weather such as strong winds or sandstorms. Due to the characteristics of light weight, high flexibility and low damping of high-voltage transmission tower line systems, wind damage and wind destruction accidents occur frequently, causing great damage to the power industry and causing huge economic losses. Therefore, it is of great significance to improve the design level of transmission towers and enhance the wind and sand resistance of transmission tower line systems.

[0003] At present, the mainstream analysis method of transmission towers only considers the influence of wind load, which is mainly divided into static method and dynamic method. Among them, the static method applies wind load to the tower body as a static force according to the height, and calculates the structural response under this action to provide a basis for design and construction; the dynamic method mostly uses wind field simulation to obtain the dynamic response of the transmission tower structure. Existing research mainly focuses on wind-induced vibration. Although wind and sand may cause serious damage to the transmission tower-line system, due to the difficulty of numerical simulation, the existing design methods rarely consider this. Therefore, there is an urgent need for a reliability evaluation method for transmission towers under wind and sand loads. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a method, device, equipment and medium for evaluating the reliability of transmission towers under wind and sand loads, which can perform reliability evaluation on transmission towers under wind and sand loads, and provide an effective reference for enhancing the wind and sand resistance of the transmission tower line system.

[0005] The embodiment of the present invention provides a method for evaluating the reliability of a transmission tower under wind and sand loads, comprising:

[0006] According to the meteorological data of the area where the target transmission tower is located, the wind speed distribution and the relationship between wind speed and sand mass density are obtained;

[0007] Generating a pure wind load and a wind-driven sand collision load according to the wind speed distribution, the relationship between the wind speed and the mass density of sand particles, and the structural parameters of the target transmission tower, and adding the pure wind load and the wind-driven sand collision load to obtain a wind-driven sand load; the wind-driven sand load includes several groups of data based on different wind speeds;

[0008] Based on the wind and sand load, a finite element analysis model of a transmission tower structure is used to perform a dynamic response analysis on the target transmission tower to obtain an analysis result, and based on the analysis result, a structural failure probability of the target transmission tower under the action of the wind and sand load is determined;

[0009] The structural reliability of the target transmission tower is calculated according to the structural failure probability of the target transmission tower and the wind speed distribution.

[0010] As an improvement of the above scheme, the pure wind load and the wind-driven sand collision load are generated according to the wind speed distribution, the relationship between the wind speed and the mass density of sand particles, and the structural parameters of the target transmission tower, including:

[0011] Based on the wind speed distribution, the sum of the average wind speed and the pulsating wind speed is calculated to obtain the total wind speed, and the pure wind load is calculated according to the total wind speed and the structural parameters of the target transmission tower;

[0012] According to the Hertz contact theory, the impact force of sand particles and the impact duration are calculated; according to the total wind speed, the relationship between the wind speed and the mass density of sand particles, and the structural parameters of the target transmission tower, the number of sand particles passing through the structural components of the transmission tower per unit time is calculated; according to the impact force of sand particles, the impact duration, and the number of sand particles passing through the structural components of the transmission tower per unit time, the wind-driven sand collision load is calculated.

[0013] As an improvement of the above solution, the calculation formula of the pure wind load is:

[0014] F w (t) = μ s Av 2 (z,t) / 1.6

[0015] Among them, F w (t) is the pure wind load at time t, μ s is the size coefficient of the transmission tower structural component, A is the windward area of ​​the transmission tower, and v(z,t) is the total wind speed at time t.

[0016] As an improvement of the above scheme, the calculation formula of the wind-driven sand collision load formula is:

[0017] F s =N·P·t du / T

[0018] Among them, T is the unit time, F s is the wind-driven sand collision load per unit time T, N is the number of sand grains passing through the transmission tower structural components per unit time T, P is the sand impact force generated by a single sand grain and the structural component, t du is the impact duration of the sand particles.

[0019] As an improvement of the above solution, the wind and sand load includes N groups of data, wherein N=N1·N2, N1 is the number of wind speed levels, and N2 is the number of repetitions of generating the wind and sand load according to each wind speed level.

[0020] As an improvement of the above solution, the determining of the structural failure probability of the target transmission tower under the action of the wind and sand load based on the analysis result includes:

[0021] According to the analysis results, the number of structural failures n corresponding to different levels of wind speed is statistically obtained, where n≤N2;

[0022] For each level of wind speed, the ratio of n to N2 is calculated to obtain the structural failure probability of the target transmission tower under the action of wind and sand load at this level of wind speed.

[0023] As an improvement of the above solution, the structural reliability of the target transmission tower is calculated based on the structural failure probability of the target transmission tower and the wind speed distribution, including:

[0024] According to the structural failure probability corresponding to different levels of wind speed, the probability density distribution function is fitted;

[0025] According to the probability density distribution function and the wind speed distribution, the structural reliability of the target transmission tower is calculated; the calculation formula of the structural reliability is:

[0026]

[0027] Among them, β represents the structural reliability of the transmission tower, Φ -1 () represents the inverse function of the standard normal distribution cumulative distribution function, pdf(v) represents the wind speed distribution function, F R (v) represents the probability density distribution function of transmission tower structure failure, and v is the wind speed.

[0028] The embodiment of the present invention further provides a transmission tower reliability evaluation device under wind and sand load, comprising:

[0029] A data acquisition module is used to obtain the wind speed distribution and the relationship between wind speed and sand mass density based on the meteorological data of the area where the target transmission tower is located;

[0030] A wind and sand load module, for generating a pure wind load and a wind-driven sand collision load according to the wind speed distribution, the relationship between the wind speed and the mass density of sand particles, and the structural parameters of the target transmission tower, and adding the pure wind load and the wind-driven sand collision load to obtain a wind and sand load; the wind and sand load includes several groups of data based on different wind speeds;

[0031] A failure probability module is used to perform a dynamic response analysis on the target transmission tower based on the wind and sand load using a transmission tower structure finite element analysis model to obtain an analysis result, and determine a structural failure probability of the target transmission tower under the action of the wind and sand load based on the analysis result;

[0032] The reliability calculation module is used to calculate the structural reliability of the target transmission tower according to the structural failure probability of the target transmission tower and the wind speed distribution.

[0033] An embodiment of the present invention further provides a computer device, comprising a processor and a memory, wherein a computer program is stored in the memory, and the computer program is configured to be executed by the processor, and when the processor executes the computer program, the reliability evaluation method of a transmission tower under wind and sand load as described in any one of the above items is implemented.

[0034] An embodiment of the present invention further provides a computer-readable storage medium, which stores a computer program. When the computer program is running, the device where the computer-readable storage medium is located is controlled to execute any of the above-mentioned methods for evaluating the reliability of transmission towers under wind and sand loads.

[0035] Compared with the prior art, the beneficial effects of the reliability evaluation method, device, equipment and medium of a transmission tower under wind and sand load provided by the embodiment of the present invention are: by obtaining the wind speed distribution of the target transmission tower location and the relationship between wind speed and sand mass density from meteorological data, pure wind load and wind-driven sand collision load are generated, and the two are superimposed to generate wind and sand load; then, a transmission tower structure finite element analysis model is used to perform a dynamic response analysis of the transmission tower based on different wind and sand loads, and the structural failure probability of the transmission tower is obtained according to the analysis results; finally, according to the structural failure probability and wind speed distribution of the transmission tower, the structural reliability of the transmission tower is obtained, and the reliability analysis and evaluation of the transmission tower under wind and sand load is completed. The present invention can accurately simulate the wind and sand load in the actual environment, effectively evaluate the reliability of the transmission tower line system in the wind and sand environment, is conducive to the design and maintenance of the transmission tower in the wind and sand environment, can reduce the probability of accidents, and improve the safety of the long-term operation of the transmission tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a flow chart of a reliability evaluation method of a transmission tower under wind and sand load provided by an embodiment of the present invention;

[0037] Figure 2 is a time history graph of a generated wind speed provided by an embodiment of the present invention;

[0038] Figure 3 is a structural failure probability fitting curve diagram provided by an embodiment of the present invention;

[0039] Figure 4 It is a structural schematic diagram of a transmission tower reliability evaluation device under wind and sand load provided by an embodiment of the present invention;

[0040] Figure 5 It is a structural schematic diagram of a computer device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] See also Figure 1 , Figure 1 The figure is a flow chart of a method for evaluating the reliability of a transmission tower under wind and sand loads provided by an embodiment of the present invention. The method for evaluating the reliability of a transmission tower under wind and sand loads comprises:

[0043] S1: Obtain the wind speed distribution and the relationship between wind speed and sand mass density based on the meteorological data of the area where the target transmission tower is located;

[0044] Specifically, the target transmission tower is a transmission tower that needs to be evaluated for reliability. First, the relationship between wind speed and sand mass density at the location of the target transmission tower is obtained based on meteorological data, that is, the coupling relationship between wind speed and sand content. When there is a relationship between wind speed and sand mass density in the meteorological data, the meteorological data is directly used.

[0045] Furthermore, when there is no relationship between the wind speed and the mass density of sand particles at the location of the target transmission tower in the meteorological data, the relationship between the wind speed and the mass density of sand particles is obtained by fitting according to the following formula:

[0046]

[0047] Among them, ρ TSP is the mass density of sand particles per unit volume, in mg / m 3 ; v is wind speed, unit is m / s.

[0048] Furthermore, when the meteorological data contains the relationship between wind speed and visibility at the location of the target transmission tower, the mass density of sand particles can be estimated based on visibility, and the formula is as follows:

[0049]

[0050] Among them, ρ TSP is the mass density of sand particles per unit volume; D vis the visibility, in km. Then, the relationship between wind speed and sand mass density is obtained.

[0051] Furthermore, the average wind distribution at a height of 10 meters where the target transmission tower is located (i.e., wind speed distribution) is obtained from the meteorological data to obtain the wind speed distribution function pdf (v). Specifically, the wind speed can be obtained by fitting the Weibull distribution.

[0052] S2: generating a pure wind load and a wind-driven sand collision load according to the wind speed distribution, the relationship between the wind speed and the mass density of sand particles, and the structural parameters of the target transmission tower, and adding the pure wind load and the wind-driven sand collision load to obtain a wind-driven sand load; the wind-driven sand load includes several groups of data based on different wind speeds;

[0053] As one of the optional embodiments, generating pure wind load and wind-driven sand collision load according to the wind speed distribution, the relationship between the wind speed and the mass density of sand particles, and the structural parameters of the target transmission tower includes:

[0054] Based on the wind speed distribution, the sum of the average wind speed and the pulsating wind speed is calculated to obtain the total wind speed, and the pure wind load is calculated according to the total wind speed and the structural parameters of the target transmission tower;

[0055] According to the Hertz contact theory, the impact force of sand particles and the impact duration are calculated; according to the total wind speed, the relationship between the wind speed and the mass density of sand particles, and the structural parameters of the target transmission tower, the number of sand particles passing through the structural components of the transmission tower per unit time is calculated; according to the impact force of sand particles, the impact duration, and the number of sand particles passing through the structural components of the transmission tower per unit time, the wind-driven sand collision load is calculated.

[0056] Specifically, the wind-sand load is obtained by superimposing the pure wind load and the wind-driven sand collision load.

[0057] As one of the optional embodiments, the calculation formula of the pure wind load is:

[0058] F w (t) = μ s Av 2 (z,t) / 1.6

[0059] Among them, F w (t) is the pure wind load at time t, μ s is the size coefficient of the transmission tower structural component, A is the windward area of ​​the transmission tower, and v(z,t) is the total wind speed at time t.

[0060] Specifically, the average wind speed is first calculated based on the wind profile (i.e., wind speed distribution). The calculation formula for the average wind speed is:

[0061]

[0062] in, is the average wind speed at any point; v 10 is the average wind speed at a height of 10m; i is the height of any point; z 10 is the standard height, preferably 10m; a is the ground roughness coefficient, which can be selected according to the "Building Structure Load Code".

[0063] Furthermore, the fluctuating wind speed is simulated according to the Davenport spectrum and harmonic wave superposition method to obtain the fluctuating wind speed. The fluctuating wind spectrum density is calculated by the following formula:

[0064]

[0065] Where S(f) is the Davenport pulsating wind spectral density; v 10 is the average wind speed at a height of 10m; f is the pulsating wind frequency; K is the surface resistance coefficient, and its corresponding value is selected from the "Building Structure Load Code" according to different ground roughness coefficients; x is an intermediate variable determined by the pulsating wind frequency and the average wind speed at a height of 10m.

[0066] Furthermore, the total wind speed is obtained by superposition of the average wind and the pulsating wind, and the formula is:

[0067]

[0068] Where v(z,t) is the total wind speed at any point at time t, is the average wind speed at any point, v f (z, t) is the fluctuating wind speed at any point at time t. It should be noted that the arbitrary point can be a point at any position in the entire wind farm, but in the actual operation of this embodiment, since only the wind speed of the point on the transmission tower is needed, only the wind speed at different heights of the transmission tower is simulated.

[0069] Furthermore, according to the size coefficient μ of the transmission tower structural components s , the windward area A of the transmission tower, the total wind speed v(z,t), and the pure wind load F are calculated. w (t).

[0070] As one of the optional embodiments, the calculation formula of the wind-driven sand collision load formula is:

[0071] F s =N·P·t du / T

[0072] Among them, T is the unit time, F sis the wind-driven sand collision load per unit time T, N is the number of sand grains passing through the transmission tower structural components per unit time T, P is the sand impact force generated by a single sand grain and the structural component, t du is the impact duration of the sand particles.

[0073] Specifically, the shape of the sand is set to be spherical, and the sand collides head-on with the structural component. According to the Hertz contact theory, the impact force of a single sand particle colliding with a structural component is:

[0074]

[0075] Among them, P is the impact force of sand particles, R is the radius of sand particles, and E * is the relative elastic modulus, and δ is the impact depth.

[0076] Furthermore, the relative elastic modulus E * The calculation formula is:

[0077]

[0078] Among them, E1 and E2 are the elastic moduli of sand particles and structural components, respectively, and μ1 and μ2 are the Poisson's ratios of sand particles and structural components, respectively.

[0079] Furthermore, the calculation formula for the impact duration is:

[0080]

[0081] Among them, t du is the impact duration, m is the mass of a single sand grain, R is the radius of the sand grain, E * is the relative elastic modulus, V impact Is the impact velocity. Where the impact velocity V impact =v(z,t).

[0082] Furthermore, the mass of dust per unit volume is obtained according to the mass density of sand particles per unit volume, and then the mass of wind-blown sand passing through the windward area of ​​the transmission tower per unit time is obtained according to the windward area of ​​the transmission tower and the total wind speed. The calculation formula is:

[0083] M=A·v(z,t)·ρ TSP

[0084] Where M is the mass of wind and sand passing through the windward area of ​​the transmission tower per unit time, A is the windward area of ​​the transmission tower, v(z,t) is the total wind speed, and ρ TSP is the mass density of sand particles per unit volume.

[0085] Furthermore, according to the radius and density of the sand particles, the number of sand particles passing through the transmission tower structural components per unit time is obtained, and the calculation formula is:

[0086]

[0087] Where N is the number of sand grains passing through the transmission tower structure per unit time, ρ is the density of sand grains, and R is the radius of sand grains.

[0088] Finally, according to formula F s =N·P·t du / T, the wind-driven sand collision load is calculated.

[0089] Furthermore, the wind-sand load is calculated based on the pure wind load and the wind-driven sand collision load, and the formula is:

[0090] F ws =F w +F s

[0091] Among them, F ws is the wind and sand load, F w is pure wind load, F s It is the collision load of wind-driven sand.

[0092] As one of the optional embodiments, the wind and sand load includes N groups of data, wherein N=N1·N2, N1 is the number of wind speed levels, and N2 is n for generating the wind and sand load according to each wind speed level.

[0093] Specifically, the embodiment of the present invention uses the average wind speed v at a height of 10m 10 As the independent variable, set v 10 There are N1 levels of values, for example: v 10 The values ​​are 10m / s, 15m / s, ..., 45m / s. 10 For each level of value, the wind and sand load simulation of step S2 is repeated for N2 times, and N = N1·N2 sets of wind and sand load data are obtained. Among them, since the wind load is obtained by the harmonic superposition method, and the wind speed generated by the harmonic superposition method is different each time, such as Figure 2 As shown, it is a time history curve diagram of a generated wind speed provided by an embodiment of the present invention. Therefore, for the same level of wind speed, repeated simulations can be performed several times to obtain multiple sets of different wind and sand load data, making the evaluation results more statistically significant.

[0094] S3: Based on the wind and sand load, a finite element analysis model of a transmission tower structure is used to perform a dynamic response analysis on the target transmission tower to obtain an analysis result, and based on the analysis result, a structural failure probability of the target transmission tower under the action of the wind and sand load is determined;

[0095] As one of the optional embodiments, determining the structural failure probability of the target transmission tower under the action of the wind and sand load based on the analysis result includes:

[0096] According to the analysis results, the number of structural failures n corresponding to different levels of wind speed is statistically obtained, where n≤N2;

[0097] For each level of wind speed, the ratio of n to N2 is calculated to obtain the structural failure probability of the target transmission tower under the action of wind and sand load at this level of wind speed.

[0098] Specifically, a finite element analysis model of the target transmission tower is established, and N groups of wind and sand loads are respectively input into the model for dynamic response analysis to obtain analysis results; wherein, the analysis results include but are not limited to displacement, acceleration, internal force, stress and other data, which are selected by engineers according to specific needs.

[0099] Furthermore, according to the preset failure criteria, it is determined whether the target transmission tower fails under each group of wind and sand loads; wherein, the preset failure criteria include but are not limited to the tower top displacement exceeding a certain limit, the internode rotation angle exceeding a certain limit, the main material stress exceeding a certain limit, etc., which are selected by engineers according to specific needs. Then, according to the judgment results, v 10 Take the number of structural failures n at different values, where n≤N2, and determine the structural failure probability of the target transmission tower under the action of wind and sand load at each wind speed. The calculation formula for the structural failure probability is:

[0100]

[0101] Among them, P f is the probability of structural failure, and n is the number of structural failures. For N1 levels of average wind speed, the structural failure probability corresponding to each level of wind speed is calculated to obtain N1 structural failure probabilities.

[0102] S4: Calculate the structural reliability of the target transmission tower according to the structural failure probability of the target transmission tower and the wind speed distribution.

[0103] Specifically, the probability of failure of N1 structures is fitted to obtain the probability density distribution function F of the transmission tower structure failure R (v), and then the structural reliability of the target transmission tower is calculated, and the structural performance of the transmission tower can be measured based on the reliability. If the obtained structural reliability is lower than the threshold, it means that the target transmission tower has poor performance and should be redesigned or its structure should be reinforced. For steel structures such as transmission towers, the threshold can be set to 2.7.

[0104] As one of the optional embodiments, the calculating the structural reliability of the target transmission tower according to the structural failure probability of the target transmission tower and the wind speed distribution includes:

[0105] According to the structural failure probability corresponding to different levels of wind speed, the probability density distribution function is fitted;

[0106] According to the probability density distribution function and the wind speed distribution, the structural reliability of the target transmission tower is calculated; the calculation formula of the structural reliability is:

[0107]

[0108] Among them, β represents the structural reliability of the transmission tower, Φ -1 () represents the inverse function of the standard normal distribution cumulative distribution function, pdf(v) represents the wind speed distribution function, F R (v) represents the probability density distribution function of transmission tower structure failure, and v is the wind speed.

[0109] For example, let the average wind speed v at a height of 10 m be 10 The speeds are taken as 10m / s, 15m / s, …, 55m / s respectively, which are divided into 10 levels. 1000 sets of wind and sand loads are generated for each level, and a total of 10000 sets of wind and sand loads are generated.

[0110] 10,000 sets of wind and sand loads were input into the finite element analysis model of the transmission tower structure for finite element analysis, thereby obtaining the structural failure probability and fitting curve of the transmission tower under various wind speeds, as shown in the figure. Figure 3 shown.

[0111] Furthermore, the structural reliability of the target transmission tower under the action of wind and sand is calculated according to the formula of structural reliability: β=3.2, which means that the structural performance of the target transmission tower is good.

[0112] The embodiment of the present invention obtains the wind speed distribution at the location of the target transmission tower and the relationship between wind speed and sand mass density from meteorological data, generates pure wind load and wind-driven sand collision load, and superimposes the two to generate wind and sand load; then adopts the transmission tower structure finite element analysis model, performs dynamic response analysis of the transmission tower based on different wind and sand loads, and obtains the structural failure probability of the transmission tower according to the analysis results; finally, according to the structural failure probability and wind speed distribution of the transmission tower, obtains the structural reliability of the transmission tower, and completes the reliability analysis and evaluation of the transmission tower under wind and sand load. The present invention can accurately simulate the wind and sand load in the actual environment, effectively evaluate the reliability of the transmission tower line system in the wind and sand environment, is conducive to the design and maintenance of the transmission tower in the wind and sand environment, can reduce the probability of accidents, and improve the safety of the long-term operation of the transmission tower.

[0113] Correspondingly, the present invention also provides a transmission tower reliability evaluation device under wind and sand load, which can implement all processes of the transmission tower reliability evaluation method under wind and sand load in the above embodiment.

[0114] See also Figure 4 , Figure 4 1 is a schematic diagram of a transmission tower reliability evaluation device under wind and sand load provided by an embodiment of the present invention. The transmission tower reliability evaluation device under wind and sand load comprises:

[0115] The data acquisition module 401 is used to obtain the wind speed distribution and the relationship between the wind speed and the mass density of sand particles according to the meteorological data of the area where the target transmission tower is located;

[0116] The wind and sand load module 402 is used to generate a pure wind load and a wind-driven sand collision load according to the wind speed distribution, the relationship between the wind speed and the mass density of sand particles, and the structural parameters of the target transmission tower, and add the pure wind load and the wind-driven sand collision load to obtain the wind and sand load; the wind and sand load includes several groups of data based on different wind speeds;

[0117] The failure probability module 403 is used to perform a dynamic response analysis on the target transmission tower based on the wind and sand load using a transmission tower structure finite element analysis model to obtain an analysis result, and determine the structural failure probability of the target transmission tower under the action of the wind and sand load based on the analysis result;

[0118] The reliability calculation module 404 is used to calculate the structural reliability of the target transmission tower according to the structural failure probability of the target transmission tower and the wind speed distribution.

[0119] Preferably, generating pure wind load and wind-driven sand collision load according to the wind speed distribution, the relationship between the wind speed and the mass density of sand particles, and the structural parameters of the target transmission tower includes:

[0120] Based on the wind speed distribution, the sum of the average wind speed and the pulsating wind speed is calculated to obtain the total wind speed, and the pure wind load is calculated according to the total wind speed and the structural parameters of the target transmission tower;

[0121] According to the Hertz contact theory, the impact force of sand particles and the impact duration are calculated; according to the total wind speed, the relationship between the wind speed and the mass density of sand particles, and the structural parameters of the target transmission tower, the number of sand particles passing through the structural components of the transmission tower per unit time is calculated; according to the impact force of sand particles, the impact duration, and the number of sand particles passing through the structural components of the transmission tower per unit time, the wind-driven sand collision load is calculated.

[0122] Preferably, the calculation formula of the pure wind load is:

[0123] F w (t) = μ s Av 2 (z,t) / 1.6

[0124] Among them, F w (t) is the pure wind load at time t, μ s is the size coefficient of the transmission tower structural component, A is the windward area of ​​the transmission tower, and v(z,t) is the total wind speed at time t.

[0125] Preferably, the calculation formula of the wind-driven sand collision load formula is:

[0126] F s =N·P·t du / T

[0127] Among them, T is the unit time, F s is the wind-driven sand collision load per unit time T, N is the number of sand grains passing through the transmission tower structural components per unit time T, P is the sand impact force generated by a single sand grain and the structural component, t du is the impact duration of the sand particles.

[0128] Preferably, the wind and sand load includes N groups of data, wherein N=N1·N2, N1 is the number of wind speed levels, and N2 is the number of repetitions of generating the wind and sand load according to each wind speed level.

[0129] Preferably, determining the structural failure probability of the target transmission tower under the action of the wind and sand load based on the analysis result includes:

[0130] According to the analysis results, the number of structural failures n corresponding to different levels of wind speed is statistically obtained, where n≤N2;

[0131] For each level of wind speed, the ratio of n to N2 is calculated to obtain the structural failure probability of the target transmission tower under the action of wind and sand load at this level of wind speed.

[0132] Preferably, the calculating the structural reliability of the target transmission tower according to the structural failure probability of the target transmission tower and the wind speed distribution includes:

[0133] According to the structural failure probability corresponding to different levels of wind speed, the probability density distribution function is fitted;

[0134] According to the probability density distribution function and the wind speed distribution, the structural reliability of the target transmission tower is calculated; the calculation formula of the structural reliability is:

[0135]

[0136] Among them, β represents the structural reliability of the transmission tower, Φ -1 () represents the inverse function of the standard normal distribution cumulative distribution function, pdf(v) represents the wind speed distribution function, F R (v) represents the probability density distribution function of transmission tower structure failure, and v is the wind speed.

[0137] In the specific implementation, the working principle, control process and technical effect achieved by the transmission tower reliability evaluation device under wind and sand load provided in the embodiment of the present invention are the same as those of the transmission tower reliability evaluation method under wind and sand load in the above embodiment, and will not be repeated here.

[0138] See also Figure 5 , Figure 5 5 is a structural block diagram of a computer device provided in an embodiment of the present application, wherein the computer device comprises: a processor 501, a memory 502, and a computer program stored in the memory 502 and executable on the processor 501. When the processor 501 executes the computer program, the steps in the above-mentioned embodiment of the reliability evaluation method for a transmission tower under wind and sand load are implemented. Alternatively, when the processor 501 executes the computer program, the functions of each module / unit in the above-mentioned device embodiments are implemented.

[0139] Exemplarily, the computer program may be divided into one or more modules / units, which are stored in the memory 502 and executed by the processor 501 to complete the present application. The one or more modules / units may be a series of computer program instruction segments capable of completing specific functions, which are used to describe the execution process of the computer program in the computer device.

[0140] The computer device may include, but is not limited to, a processor 501 and a memory 502. Those skilled in the art will appreciate that the schematic diagram is merely an example of a computer device and does not constitute a limitation on the computer device, and may include more or fewer components than shown in the diagram, or may combine certain components, or different components, for example, the computer device may also include an input / output device, a network access device, a bus, etc.

[0141] The processor 501 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor 501 is the control center of the computer device, and uses various interfaces and lines to connect various parts of the entire computer device.

[0142] The memory 502 can be used to store the computer program and / or module. The processor 501 implements various functions of the computer device by running or executing the computer program and / or module stored in the memory 502 and calling the data stored in the memory 502. The memory 502 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory 502 can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (SecureDigital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0143] Wherein, if the module / unit integrated in the computer device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor 501. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc.

[0144] An embodiment of the present invention further provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the transmission tower reliability evaluation method under wind and sand load described in any of the above embodiments.

[0145] The embodiment of the present invention provides a method, device, equipment and medium for evaluating the reliability of a transmission tower under wind and sand loads, and its beneficial effects are: by obtaining the wind speed distribution of the target transmission tower location and the relationship between wind speed and sand mass density from meteorological data, pure wind load and wind-driven sand collision load are generated, and the two are superimposed to generate wind and sand loads; then, a transmission tower structure finite element analysis model is used to perform a dynamic response analysis of the transmission tower based on different wind and sand loads, and the structural failure probability of the transmission tower is obtained according to the analysis results; finally, according to the structural failure probability and wind speed distribution of the transmission tower, the structural reliability of the transmission tower is obtained, and the reliability analysis and evaluation of the transmission tower under wind and sand loads are completed. The present invention can accurately simulate the wind and sand loads in the actual environment, effectively evaluate the reliability of the transmission tower line system in the wind and sand environment, is conducive to the design and maintenance of the transmission tower in the wind and sand environment, can reduce the probability of accidents, and improve the safety of the long-term operation of the transmission tower.

[0146] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A reliability evaluation method for transmission towers under wind and sand loads, characterized in that: include: According to the meteorological data of the area where the target transmission tower is located, the wind speed distribution and the relationship between wind speed and sand mass density are obtained; Generating a pure wind load and a wind-driven sand collision load according to the wind speed distribution, the relationship between the wind speed and the mass density of sand particles, and the structural parameters of the target transmission tower, and adding the pure wind load and the wind-driven sand collision load to obtain a wind-driven sand load; the wind-driven sand load includes several groups of data based on different wind speeds; Based on the wind and sand load, a finite element analysis model of a transmission tower structure is used to perform a dynamic response analysis on the target transmission tower to obtain an analysis result, and based on the analysis result, a structural failure probability of the target transmission tower under the action of the wind and sand load is determined; The structural reliability of the target transmission tower is calculated according to the structural failure probability of the target transmission tower and the wind speed distribution.

2. The reliability evaluation method of a transmission tower under wind and sand load according to claim 1, characterized in that: Generating a pure wind load and a wind-driven sand collision load according to the wind speed distribution, the relationship between the wind speed and the mass density of sand particles, and the structural parameters of the target transmission tower includes: Based on the wind speed distribution, the sum of the average wind speed and the pulsating wind speed is calculated to obtain the total wind speed, and the pure wind load is calculated according to the total wind speed and the structural parameters of the target transmission tower; According to the Hertz contact theory, the impact force of sand particles and the impact duration are calculated; according to the total wind speed, the relationship between the wind speed and the mass density of sand particles, and the structural parameters of the target transmission tower, the number of sand particles passing through the structural components of the transmission tower per unit time is calculated; according to the impact force of sand particles, the impact duration, and the number of sand particles passing through the structural components of the transmission tower per unit time, the wind-driven sand collision load is calculated.

3. The reliability evaluation method of a transmission tower under wind and sand load as claimed in claim 2, characterized in that: The calculation formula of the pure wind load is: F w (t)=μ s Of 2 (z,t) / 1.6 Among them, F w (t) is the pure wind load at time t, μ s is the size coefficient of the transmission tower structural component, A is the windward area of ​​the transmission tower, and v(z,t) is the total wind speed at time t.

4. The reliability evaluation method of a transmission tower under wind and sand load as claimed in claim 2, characterized in that: The calculation formula of the wind-driven sand collision load formula is: F s =N·P·t du / T Among them, T is the unit time, F s is the wind-driven sand collision load per unit time T, N is the number of sand grains passing through the transmission tower structural components per unit time T, P is the sand impact force generated by a single sand grain and the structural component, t du is the impact duration of the sand particles.

5. The reliability evaluation method of a transmission tower under wind and sand load according to claim 1, characterized in that: The wind and sand load includes N groups of data, wherein N=N1·N2, N1 is the number of wind speed levels, and N2 is the number of repetitions of generating the wind and sand load according to each wind speed level.

6. The reliability evaluation method of a transmission tower under wind and sand load as claimed in claim 5, characterized in that: The determining, based on the analysis result, the structural failure probability of the target transmission tower under the action of the wind and sand load comprises: According to the analysis results, the number of structural failures n corresponding to different levels of wind speed is statistically obtained, where n≤N2; For each level of wind speed, the ratio of n to N2 is calculated to obtain the structural failure probability of the target transmission tower under the action of wind and sand load at this level of wind speed.

7. The reliability evaluation method of a transmission tower under wind and sand load according to claim 1, characterized in that: The calculating the structural reliability of the target transmission tower according to the structural failure probability of the target transmission tower and the wind speed distribution includes: According to the structural failure probability corresponding to different levels of wind speed, the probability density distribution function is fitted; According to the probability density distribution function and the wind speed distribution, the structural reliability of the target transmission tower is calculated; the calculation formula of the structural reliability is: Among them, β represents the structural reliability of the transmission tower, Φ -1 () represents the inverse function of the standard normal distribution cumulative distribution function, pdf(v) represents the wind speed distribution function, F R (v) represents the probability density distribution function of transmission tower structure failure, and v is the wind speed.

8. A reliability evaluation device for a transmission tower under wind and sand load, characterized in that: include: A data acquisition module is used to obtain the wind speed distribution and the relationship between wind speed and sand mass density based on the meteorological data of the area where the target transmission tower is located; A wind and sand load module, for generating a pure wind load and a wind-driven sand collision load according to the wind speed distribution, the relationship between the wind speed and the mass density of sand particles, and the structural parameters of the target transmission tower, and adding the pure wind load and the wind-driven sand collision load to obtain a wind and sand load; the wind and sand load includes several groups of data based on different wind speeds; A failure probability module is used to perform a dynamic response analysis on the target transmission tower based on the wind and sand load using a transmission tower structure finite element analysis model to obtain an analysis result, and determine a structural failure probability of the target transmission tower under the action of the wind and sand load based on the analysis result; The reliability calculation module is used to calculate the structural reliability of the target transmission tower according to the structural failure probability of the target transmission tower and the wind speed distribution.

9. A computer device, characterized in that: The method comprises a processor and a memory, wherein a computer program is stored in the memory and the computer program is configured to be executed by the processor, and when the processor executes the computer program, the method for evaluating the reliability of a transmission tower under wind and sand load as claimed in any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, wherein when the device where the computer-readable storage medium is located executes the computer program, the reliability evaluation method of the transmission tower under wind and sand load as described in any one of claims 1 to 7 is implemented.

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