CN116957183A - Power transmission tower foundation slip safety evaluation method, system, equipment and medium - Google Patents

Power transmission tower foundation slip safety evaluation method, system, equipment and medium Download PDF

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CN116957183A
CN116957183A CN202210351214.8A CN202210351214A CN116957183A CN 116957183 A CN116957183 A CN 116957183A CN 202210351214 A CN202210351214 A CN 202210351214A CN 116957183 A CN116957183 A CN 116957183A
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transmission tower
tower
power transmission
maximum stress
finite element
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王飞
赵斌滨
李孟轩
杨知
孔小昂
刘毅
李丹煜
刘彬
姬昆鹏
高洁
白旭
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
State Grid Qinghai Electric Power Co Ltd
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China Electric Power Research Institute Co Ltd CEPRI
State Grid Qinghai Electric Power Co Ltd
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Abstract

The application provides a method, a system, equipment and a medium for evaluating the basic slip safety of a power transmission tower, which comprise the following steps: calculating the horizontal slippage of the power transmission tower legs based on the obtained geometric information of the centroid of the power transmission tower legs; carrying out finite element analysis under various working conditions by utilizing a pre-constructed finite element model of the transmission tower structure based on the horizontal slippage to obtain the axial force of a tower leg rod piece in the transmission tower; and calculating the maximum stress ratio of the tower leg rod pieces of the power transmission tower based on the axial force of the tower leg rod pieces, and evaluating the overall safety of the power transmission tower by the maximum stress ratio. According to the application, the horizontal slippage of the tower legs of the power transmission tower is considered, so that the safety evaluation result is more accurate.

Description

Power transmission tower foundation slip safety evaluation method, system, equipment and medium
Technical Field
The application relates to the field of disaster prevention and reduction of power engineering, in particular to a method, a system, equipment and a medium for evaluating the foundation slip safety of a power transmission tower.
Background
With the continuous development of power grid construction, the unavoidable needs of the line are in a salt lake area, a karst area and a coal goaf area, geological disasters are easy to happen in the salt lake area, the karst area and the coal goaf area, the foundation of the tower is deformed, the transmission tower is damaged, and great economic loss is caused. The deformation forms of the foundation of the salt lake area, the karst area and the coal goaf mainly comprise sedimentation, inclination, curvature and horizontal sliding deformation.
The power transmission tower is sensitive to foundation horizontal slip deformation, the foundation horizontal slip can enable the power transmission tower to generate larger additional stress, internal force redistribution of the power transmission tower is achieved, the bearing capacity of the power transmission tower is reduced, and local damage or collapse can occur when the bearing capacity of the power transmission tower is severe. At present, the safety state evaluation of the power transmission tower is mainly concentrated on the aspects of line inspection and pole tower material corrosion, and the safety evaluation of the power transmission tower is not accurate enough.
Disclosure of Invention
In order to solve the problem that the safety state evaluation of the power transmission tower in the prior art is mainly concentrated on the aspects of line inspection and pole tower material corrosion, and the safety state evaluation of the power transmission tower is inaccurate, the application provides a power transmission tower foundation sliding safety evaluation method, which comprises the following steps:
calculating the horizontal slippage of the power transmission tower legs based on the obtained geometric information of the centroid of the power transmission tower legs;
carrying out finite element analysis under various working conditions by utilizing a pre-constructed finite element model of the transmission tower structure based on the horizontal slippage to obtain the axial force of a tower leg rod piece in the transmission tower;
and calculating the maximum stress ratio of the tower leg rod pieces of the power transmission tower based on the axial force of the tower leg rod pieces, and evaluating the overall safety of the power transmission tower by the maximum stress ratio.
Preferably, the finite element analysis is performed under various working conditions by using a pre-constructed finite element model of the transmission tower structure based on the horizontal slippage to obtain the axial force of the tower leg rod piece in the transmission tower, including:
applying horizontal slippage to a finite element model of the transmission tower structure based on the horizontal slippage by utilizing finite element software to form a new equilibrium state;
and respectively applying working conditions combined by the horizontal sliding working condition and the conventional design working condition to the transmission tower in a new balance state to obtain the axial force of the tower leg rod piece in the transmission tower under each combined working condition.
Preferably, the calculating the maximum stress ratio of the power transmission tower leg member based on the axial force of the tower leg member includes:
calculating the stress of the tower leg rod pieces in the transmission tower under each working condition based on the combination of the axial force of the tower leg rod pieces in the transmission tower under each working condition and the stress calculation;
selecting the maximum stress from the stress of the tower leg rod pieces in the transmission tower under each working condition as the maximum stress of the tower leg rod pieces in the transmission tower;
and calculating the maximum stress ratio of the tower leg rod pieces in the transmission tower by combining the maximum stress of the tower leg rod pieces in the transmission tower with the maximum stress ratio calculation formula.
Preferably, the maximum stress ratio calculation formula is as follows:
R＝σ/[σ]
wherein R is the maximum stress ratio, sigma is the maximum stress of the transmission tower leg rod piece, and [ sigma ] is the allowable stress.
Preferably, the calculating the horizontal slip amount of the power transmission tower leg based on the obtained geometric information of the power transmission tower leg centroid includes:
establishing a coordinate system based on geometric information of the centroid of the power transmission tower leg;
determining the coordinates of each endpoint before the occurrence of the horizontal smoothing and the coordinates after the occurrence of the horizontal smoothing based on the coordinate system;
and subtracting the coordinates before the water smooth movement from the coordinates of each end point after the water smooth movement occurs to obtain the horizontal slippage of the tower leg of the power transmission tower.
Preferably, the construction of the transmission tower structure finite element model includes:
the main materials of the tower legs in the transmission tower are represented by beam units, and the oblique materials of the tower legs in the transmission tower and the auxiliary materials in the transmission tower are represented by rod units; establishing a finite element model of a transmission tower structure by adopting finite element software;
the transmission tower comprises a tower leg main material, a tower leg inclined material and a tower leg auxiliary material.
Preferably, the geometric information of the centroid of the power transmission tower leg includes:
four obtained column leg centroids form the included angle between each side length and each side length of the quadrangle by adopting a total station instrument or a theodolite and a level gauge.
Preferably, the evaluating the overall safety of the transmission tower by the maximum stress ratio includes:
judging the maximum stress ratio of the tower leg rod pieces in the transmission tower to 100 percent;
if the maximum stress ratio of the tower leg rod pieces in the transmission tower is less than 100%, the transmission tower is safe, otherwise, the transmission tower is unsafe.
In still another aspect, the present application further provides a system for evaluating the sliding safety of a foundation of a power transmission tower, including:
the slippage calculating module is used for calculating the horizontal slippage of the power transmission tower leg based on the obtained geometric information of the centroid of the power transmission tower leg;
the axial force calculation module is used for carrying out finite element analysis under various working conditions by utilizing a pre-constructed finite element model of the transmission tower structure based on the horizontal slippage to obtain the axial force of a tower leg rod piece in the transmission tower;
and the evaluation module is used for calculating the maximum stress ratio of the tower leg rod pieces of the power transmission tower based on the axial force of the tower leg rod pieces, and evaluating the overall safety of the power transmission tower by the maximum stress ratio.
Preferably, the axial force calculation module includes:
the slippage applying submodule is used for applying horizontal slippage to the finite element model of the transmission tower structure based on the horizontal slippage by utilizing finite element software to form a new balance state;
and the axial force output sub-module is used for respectively applying the working conditions of combination of the horizontal sliding working condition and the conventional design working condition to the transmission tower in a new balance state to obtain the axial force of the tower leg rod piece in the transmission tower under each combined working condition.
In yet another aspect, the present application also provides a computer device, including:
one or more processors;
a processor for storing one or more programs;
and when the one or more programs are executed by the one or more processors, the power transmission tower foundation slip safety evaluation method is realized.
In still another aspect, the present application further provides a computer readable storage medium, on which a computer program is stored, where the computer program is executed to implement the above-mentioned power transmission tower foundation slip safety evaluation method.
Compared with the prior art, the application has the beneficial effects that:
1. the application provides a power transmission tower foundation slip safety evaluation method, which comprises the following steps: calculating the horizontal slippage of the power transmission tower legs based on the obtained geometric information of the centroid of the power transmission tower legs; carrying out finite element analysis under various working conditions by utilizing a pre-constructed finite element model of the transmission tower structure based on the horizontal slippage to obtain the axial force of a tower leg rod piece in the transmission tower; and calculating the maximum stress ratio of the tower leg rod pieces of the power transmission tower based on the axial force of the tower leg rod pieces, and evaluating the overall safety of the power transmission tower by the maximum stress ratio. According to the application, the horizontal slippage of the tower legs of the power transmission tower is considered, so that the safety evaluation result is more accurate.
2. The application also provides a simple ground measurement and analysis method which can accurately acquire the horizontal slippage of the foundation of the power transmission tower.
Drawings
FIG. 1 is a flow chart of a method for evaluating the basic slip safety of a power transmission tower;
FIG. 2 is a schematic diagram of a tower leg foundation labeling method;
FIG. 3 is a view of a cat-head type tower in a salt lake;
FIG. 4 is a modeling diagram of a beam-to-beam hybrid unit;
fig. 5 is a graph of a quadrilateral of a power transmission tower leg centroid.
Detailed Description
For a better understanding of the present application, reference is made to the following description, drawings and examples.
The method obtains the geometric information of four tower leg centroids of a salt lake region, a karst region and a goaf transmission tower through on-site measurement, comprises the side lengths of four sides of a quadrangle formed by the four tower leg centroids and the included angles among the side lengths, obtains the horizontal slip of the four tower legs by adopting a transmission tower leg horizontal slip analysis method, establishes a transmission tower finite element model, obtains the stress distribution condition of the transmission tower under the influence of the horizontal slip of the tower legs through finite element analysis, realizes the safety state evaluation of the transmission tower, and provides basis and reference for accurately judging the safety state of the salt lake region, the karst region and the goaf transmission tower, eliminating the potential safety hazard of the transmission tower and grasping the safety health level of the transmission tower under the geological disaster condition of the salt lake region, the karst region and the goaf.
Example 1:
the application provides a power transmission tower foundation slip safety evaluation method, which is shown in fig. 1 and comprises the following steps:
step 1: calculating the horizontal slippage of the power transmission tower legs based on the obtained geometric information of the centroid of the power transmission tower legs;
step 2: carrying out finite element analysis under various working conditions by utilizing a pre-constructed finite element model of the transmission tower structure based on the horizontal slippage to obtain the axial force of a tower leg rod piece in the transmission tower;
step 3: and calculating the maximum stress ratio of the tower leg rod pieces of the power transmission tower based on the axial force of the tower leg rod pieces, and evaluating the overall safety of the power transmission tower by the maximum stress ratio.
The present application will be described in detail below:
before step 1, the method comprises the following steps:
measuring geometric information of a power transmission tower leg centroid, comprising:
using a total station or theodolite and a level measuring instrument to obtain geometric information of four column leg centroids, wherein the geometric information comprises the side lengths of four column leg centroids forming a quadrangle and included angles between the side lengths;
the step 1 of calculating the horizontal slippage of the power transmission tower leg based on the obtained geometric information of the power transmission tower leg centroid specifically comprises the following steps:
establishing a coordinate system based on geometric information of the centroid of the power transmission tower leg to calculate the horizontal slippage of the power transmission tower leg, wherein the method comprises the following steps of:
the four tower legs are numbered in the following manner, as shown in fig. 2, in the forward transmission line direction, the line direction is the forward direction from the transmission tower numbered from small to large, the transmission tower itself is assumed to be divided into a front part and a rear part according to the forward transmission line direction, the tower leg foundation on the right side of the front part is numbered as a foundation, and the other three tower legs are respectively numbered as a foundation B, a foundation C and a foundation D according to the anticlockwise direction.
According to the geometric information of the centroid of the power transmission tower leg obtained through measurement, as shown in fig. 3, a quadrangle formed by the centroids of the four tower legs of the power transmission tower is drawn in a plane by taking the centroid of the C foundation as a (0, 0) point.
According to the coordinates A (x A ,y A )，B(x B ,y B )，C(x C ,y C )，D(x D ,y D )。
Wherein the method comprises the steps ofx C ＝0，y C ＝0；/>y D ＝0；
Assuming that no horizontal migration occurs, the distances between the four tower legs are all the same, and the coordinates of the four points of the original quadrangle are:
the slip in the x direction at point a is therefore:
the sliding in the y direction of the point A is as follows:
the slip in the x direction of the point B is as follows:
the sliding in the y direction of the point B is as follows:
the slip in the x direction of the C point is as follows:
the sliding in the y direction of the C point is as follows:
the slip in the x direction of the D point is as follows:
the slip in the y direction of the D point is as follows:
before step 2, the method comprises the following steps:
establishing a finite element model of the power transmission tower:
the main materials of the tower legs in the transmission tower are represented by beam units, and the oblique materials of the tower legs in the transmission tower and the auxiliary materials in the transmission tower are represented by rod units; establishing a finite element model of a transmission tower structure by adopting finite element software;
the transmission tower comprises a tower leg main material, a tower leg inclined material and a tower leg auxiliary material.
And 2, carrying out finite element analysis on the basis of the horizontal slippage by utilizing a pre-constructed finite element model of the transmission tower structure under various working conditions to obtain the axial force of a tower leg rod piece in the transmission tower, wherein the method specifically comprises the following steps:
setting tower leg constraint by the finite element model of the power transmission tower;
applying horizontal slippage to the tower legs of the finite element model based on the horizontal slippage of the tower legs to form a finite element model of the power transmission tower in a new equilibrium state; and the working conditions of combination of the horizontal sliding working condition and the conventional design working condition are respectively applied to the transmission tower in the new balance state, so that the axial force of the tower leg rod piece in the transmission tower under each combined working condition is obtained. The method comprises the following specific steps:
finite element software is adopted to build a finite element model of the transmission tower structure, a main material adopts a beam unit, and an inclined material and an auxiliary material adopt a rod unit as shown in fig. 4. And (3) setting constraint at the tower leg, fixedly connecting the tower leg foundation which does not slide horizontally, and releasing the degree of freedom of the tower leg which slides horizontally in the horizontal direction. After the transmission tower structure generates the horizontal movement of the tower legs, a new balance state is formed. The horizontal slip may not be damaged directly, but may not meet the design condition requirements, so that the axial force is obtained by performing finite element calculation analysis on the combination of the horizontal slip condition and the conventional condition.
The conventional working conditions include: strong wind condition, icing condition, uneven ice condition and normal operation condition.
In the step 3, the maximum stress ratio of the tower leg rod pieces of the power transmission tower is calculated based on the axial force of the tower leg rod pieces, and the overall safety of the power transmission tower is evaluated by the maximum stress ratio, and the method specifically comprises the following steps:
calculating the stress of the tower leg rod pieces in the transmission tower under each working condition based on the combination of the axial force of the tower leg rod pieces in the transmission tower under each working condition and the stress calculation; wherein the stress is calculated as:
σ＝N/S/Φ
where σ is stress, N is axial force, S is cross-sectional area of the rod, and Φ is stability factor.
Selecting the maximum stress from the stress of the tower leg rod pieces in the transmission tower under each working condition as the maximum stress of the tower leg rod pieces in the transmission tower;
the maximum stress ratio of the main tower leg material, the inclined tower leg material and the cross section bar material of the tower leg of the power transmission tower is calculated according to the maximum stress ratio based on the maximum stress of the tower leg bar material, and the method comprises the following steps:
R＝σ/[σ]
wherein R is the maximum stress ratio, sigma is the stress, sigma is the allowable stress, and the allowable stress, the stability coefficient and the cross section area of the rod are obtained by technical specifications.
Evaluating the overall safety of the transmission tower based on the maximum stress ratio, comprising:
after the limited calculation and analysis of the combination of the horizontal sliding working condition and the conventional working condition of the foundation of the power transmission tower, the maximum stress ratio of the main tower leg material, the inclined tower leg material and the transverse tower leg surface material is taken as a damage index by combining the requirements of DL/T5154-2012 'structural design technical regulation of the pole tower structure of the overhead transmission line', and simultaneously considering the strength and stability requirements, when the stress ratio is more than or equal to 100%, the unsafe power transmission tower is evaluated, and when the maximum stress ratio is less than 100%, the safe power transmission tower is evaluated.
Example 2:
the application will be described in detail with reference to specific examples below:
according to the application, a cat head type tower in a certain salt lake area is selected as an example, as shown in fig. 5, the tower height is 51.75m, the calling height is 39m, the 10min design wind speed at the 10m height is 27m/s, the cat head type tower is composed of angle steels, and the root of the cat head type tower is 7.874m.
(1) And measuring the geometric information of the centroid of the tower leg of the power transmission tower.
And obtaining the geometric information of four column leg centroids by using a total station instrument or a theodolite and a level gauge instrument, wherein the geometric information comprises the side lengths of four column leg centroids and included angles between the side lengths.
It is obtained by measurement that the temperature of the liquid is higher than the temperature of the liquid,δ＝90°，/>γ＝89.9272°。
in the forward transmission line direction, the line direction is the forward direction from the transmission tower label to the large direction, the transmission tower is also assumed to be divided into a front part and a rear part according to the forward line direction, the tower leg foundation label on the right side of the front part is taken as a foundation A, and the other three tower legs are respectively taken as a foundation B, a foundation C and a foundation D according to the anticlockwise direction.
(2) Analysis and calculation method for horizontal slippage of foundation of power transmission tower
According to the geometric information of the centroid of the power transmission tower leg obtained through measurement, as shown in fig. 5, a quadrangle formed by the centroids of the four tower legs of the power transmission tower is drawn in a plane by taking the centroid of the C foundation as a (0, 0) point.
Coordinates of four points of the drawn quadrangle: a (7.874), B (0,7.874), C (0, 0), D (7.874,0).
Coordinates of four points of the original quadrangle:
A 0 (7.874,7.874)，B 0 (0.01,7.874)，C0(0,0)，D 0 (7.874,0)。
the slip in the x direction of the point B was 10mm.
(3) Finite element analysis of the cat head-shaped power transmission tower under the action of basic sliding deformation:
and (3) establishing a finite element model of the ultra-high voltage prototype test tower by adopting a finite element program, selecting a beam-rod mixed unit model, simulating a main material and an inclined material by adopting a beam unit, and simulating an auxiliary material by adopting a rod unit. And (3) setting constraint at the tower leg, fixedly connecting the tower leg foundation A, C, D which does not slip, and releasing the degree of freedom of the tower leg foundation B in the horizontal x direction. And applying horizontal x displacement for 10mm on a tower leg foundation B of the cat head-shaped power transmission tower, taking the horizontal x displacement as a new balance state, and applying design working condition load of the cat head-shaped tower to form various combined working conditions of basic slip+90 strong winds, basic slip+60 strong winds, basic slip+45 strong winds, basic slip+0 strong winds, basic slip+icing, basic slip+disconnection, basic slip+low temperature and the like.
(4) Overall safety evaluation of the power transmission tower based on the maximum stress ratio:
after the limited calculation and analysis of the combination of the basic slip working condition and the conventional design working condition of the power transmission tower, the maximum stress ratio of the main tower leg material, the inclined tower leg material and the transverse tower leg surface material is taken as a damage index by combining the requirements of DL/T5154-2012 'structural design technical regulation of the pole and tower structure of the overhead transmission line', and simultaneously taking the strength and stability requirements into consideration, the calculation result shows that the basic slip +0 strong wind working condition is a dangerous working condition, the dangerous rod is the inclined tower leg material, the maximum stress ratio is 96.42%, and the safety of the power transmission tower is evaluated.
Example 3:
based on the same inventive concept, the embodiment of the application also provides a power transmission tower foundation slip safety evaluation system, which comprises:
the slippage calculating module is used for calculating the horizontal slippage of the power transmission tower leg based on the obtained geometric information of the centroid of the power transmission tower leg;
the axial force calculation module is used for carrying out finite element analysis under various working conditions by utilizing a pre-constructed finite element model of the transmission tower structure based on the horizontal slippage to obtain the axial force of a tower leg rod piece in the transmission tower;
and the evaluation module is used for calculating the maximum stress ratio of the tower leg rod pieces of the power transmission tower based on the axial force of the tower leg rod pieces, and evaluating the overall safety of the power transmission tower by the maximum stress ratio.
An axial force calculation module comprising:
the slippage applying submodule is used for applying horizontal slippage to the finite element model of the transmission tower structure based on the horizontal slippage by utilizing finite element software to form a new balance state;
and the axial force output sub-module is used for respectively applying the working conditions of combination of the horizontal sliding working condition and the conventional design working condition to the transmission tower in a new balance state to obtain the axial force of the tower leg rod piece in the transmission tower under each combined working condition.
The evaluation module is specifically used for:
calculating the stress of the tower leg rod pieces in the transmission tower under each working condition based on the combination of the axial force of the tower leg rod pieces in the transmission tower under each working condition and the stress calculation;
selecting the maximum stress from the stress of the tower leg rod pieces in the transmission tower under each working condition as the maximum stress of the tower leg rod pieces in the transmission tower;
calculating the maximum stress ratio of the tower leg rod pieces in the transmission tower by combining the maximum stress of the tower leg rod pieces in the transmission tower with the maximum stress ratio calculation formula;
judging the maximum stress ratio of the tower leg rod pieces in the transmission tower to 100 percent;
if the maximum stress ratio of the tower leg rod pieces in the transmission tower is less than 100%, the transmission tower is safe, otherwise, the transmission tower is unsafe.
The maximum stress ratio calculation formula is shown as follows:
R＝σ/[σ]
wherein R is the maximum stress ratio, sigma is the maximum stress of the transmission tower leg rod piece, and [ sigma ] is the allowable stress.
The power transmission tower foundation slip safety evaluation system further comprises a model construction module, wherein the model construction module is used for constructing a finite element model of a power transmission tower structure, and is specifically used for:
the main materials of the tower legs in the transmission tower are represented by beam units, and the oblique materials of the tower legs in the transmission tower and the auxiliary materials in the transmission tower are represented by rod units; establishing a finite element model of a transmission tower structure by adopting finite element software;
the transmission tower comprises a tower leg main material, a tower leg inclined material and a tower leg auxiliary material.
The slippage calculating module is specifically used for:
adopting a total station or theodolite and a level gauge, and forming four column leg centroids into four sides of a quadrangle and included angles between the sides;
establishing a coordinate system based on geometric information of the centroid of the power transmission tower leg;
determining the coordinates of each endpoint before the occurrence of the horizontal smoothing and the coordinates after the occurrence of the horizontal smoothing based on the coordinate system;
and subtracting the coordinates before the water smooth movement from the coordinates of each end point after the water smooth movement occurs to obtain the horizontal slippage of the tower leg of the power transmission tower.
Example 4:
based on the same inventive concept, the application also provides a computer device comprising a processor and a memory for storing a computer program comprising program instructions, the processor for executing the program instructions stored by the computer storage medium. The processor may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application SpecificIntegrated Circuit, ASIC), off-the-shelf Programmable gate array (FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware components, etc., which are the computational core and control core of the terminal adapted to implement one or more instructions, in particular to load and execute one or more instructions in a computer storage medium to implement the corresponding method flow or corresponding functions, to implement the steps of a transmission tower base slip security assessment method in the above embodiments.
Example 5:
based on the same inventive concept, the present application also provides a storage medium, in particular, a computer readable storage medium (Memory), which is a Memory device in a computer device, for storing programs and data. It is understood that the computer readable storage medium herein may include both built-in storage media in a computer device and extended storage media supported by the computer device. The computer-readable storage medium provides a storage space storing an operating system of the terminal. Also stored in the memory space are one or more instructions, which may be one or more computer programs (including program code), adapted to be loaded and executed by the processor. The computer readable storage medium herein may be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as at least one magnetic disk memory. One or more instructions stored in a computer-readable storage medium may be loaded and executed by a processor to implement the steps of a transmission tower foundation slip safety assessment method in the above embodiments.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing is illustrative of the present application and is not to be construed as limiting thereof, but rather as providing for the use of additional embodiments and advantages of all such modifications, equivalents, improvements and similar to the present application are intended to be included within the scope of the present application as defined by the appended claims.

Claims (12)

1. The utility model provides a transmission tower foundation slip safety evaluation method which is characterized in that the method comprises the following steps:
calculating the horizontal slippage of the power transmission tower legs based on the obtained geometric information of the centroid of the power transmission tower legs;
carrying out finite element analysis under various working conditions by utilizing a pre-constructed finite element model of the transmission tower structure based on the horizontal slippage to obtain the axial force of a tower leg rod piece in the transmission tower;
and calculating the maximum stress ratio of the tower leg rod pieces of the power transmission tower based on the axial force of the tower leg rod pieces, and evaluating the overall safety of the power transmission tower by the maximum stress ratio.
2. The method of claim 1, wherein the performing finite element analysis under a plurality of working conditions using a pre-constructed finite element model of the transmission tower structure based on the horizontal slip amount to obtain the axial force of the tower leg member in the transmission tower comprises:
applying horizontal slippage to a finite element model of the transmission tower structure based on the horizontal slippage by utilizing finite element software to form a new equilibrium state;
and respectively applying working conditions combined by the horizontal sliding working condition and the conventional design working condition to the transmission tower in a new balance state to obtain the axial force of the tower leg rod piece in the transmission tower under each combined working condition.
3. The method of claim 1, wherein calculating a maximum stress ratio of a power transmission tower leg bar based on an axial force of the tower leg bar comprises:
calculating the stress of the tower leg rod pieces in the transmission tower under each working condition based on the combination of the axial force of the tower leg rod pieces in the transmission tower under each working condition and the stress calculation;
selecting the maximum stress from the stress of the tower leg rod pieces in the transmission tower under each working condition as the maximum stress of the tower leg rod pieces in the transmission tower;
and calculating the maximum stress ratio of the tower leg rod pieces in the transmission tower by combining the maximum stress of the tower leg rod pieces in the transmission tower with the maximum stress ratio calculation formula.
4. A method according to claim 3, wherein the maximum stress ratio calculation is as follows:
R＝σ/[σ]
wherein R is the maximum stress ratio, sigma is the maximum stress of the transmission tower leg rod piece, and [ sigma ] is the allowable stress.
5. The method of claim 1, wherein calculating the horizontal slip amount of the power transmission tower leg based on the obtained geometric information of the centroid of the power transmission tower leg comprises:
establishing a coordinate system based on geometric information of the centroid of the power transmission tower leg;
determining the coordinates of each endpoint before the occurrence of the horizontal smoothing and the coordinates after the occurrence of the horizontal smoothing based on the coordinate system;
and subtracting the coordinates before the water smooth movement from the coordinates of each end point after the water smooth movement occurs to obtain the horizontal slippage of the tower leg of the power transmission tower.
6. The method of claim 1, wherein the constructing of the transmission tower structure finite element model comprises:
the main materials of the tower legs in the transmission tower are represented by beam units, and the oblique materials of the tower legs in the transmission tower and the auxiliary materials in the transmission tower are represented by rod units; establishing a finite element model of a transmission tower structure by adopting finite element software;
the transmission tower comprises a tower leg main material, a tower leg inclined material and a tower leg auxiliary material.
7. The method of claim 1, wherein the geometric information of the transmission tower leg centroid comprises:
four obtained column leg centroids form the included angle between each side length and each side length of the quadrangle by adopting a total station instrument or a theodolite and a level gauge.
8. The method of claim 1, wherein said evaluating the overall transmission tower safety from said maximum stress ratio comprises:
judging the maximum stress ratio of the tower leg rod pieces in the transmission tower to 100 percent;
if the maximum stress ratio of the tower leg rod pieces in the transmission tower is less than 100%, the transmission tower is safe, otherwise, the transmission tower is unsafe.
9. The utility model provides a transmission tower basis safety evaluation system that slides which characterized in that includes:
the slippage calculating module is used for calculating the horizontal slippage of the power transmission tower leg based on the obtained geometric information of the centroid of the power transmission tower leg;
the axial force calculation module is used for carrying out finite element analysis under various working conditions by utilizing a pre-constructed finite element model of the transmission tower structure based on the horizontal slippage to obtain the axial force of a tower leg rod piece in the transmission tower;
and the evaluation module is used for calculating the maximum stress ratio of the tower leg rod pieces of the power transmission tower based on the axial force of the tower leg rod pieces, and evaluating the overall safety of the power transmission tower by the maximum stress ratio.
10. The system of claim 9, wherein the axial force calculation module comprises:
the slippage applying submodule is used for applying horizontal slippage to the finite element model of the transmission tower structure based on the horizontal slippage by utilizing finite element software to form a new balance state;
and the axial force output sub-module is used for respectively applying the working conditions of combination of the horizontal sliding working condition and the conventional design working condition to the transmission tower in a new balance state to obtain the axial force of the tower leg rod piece in the transmission tower under each combined working condition.
11. A computer device, comprising: one or more processors;
the processor is used for storing one or more programs;
the transmission tower foundation slip safety evaluation method according to any one of claims 1 to 8 is implemented when the one or more programs are executed by the one or more processors.
12. A computer-readable storage medium, on which a computer program is stored, which computer program, when executed, implements the transmission tower foundation slip safety evaluation method according to any one of claims 1 to 8.
CN202210351214.8A 2022-04-02 2022-04-02 Power transmission tower foundation slip safety evaluation method, system, equipment and medium Pending CN116957183A (en)

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CN202210351214.8A CN116957183A (en) 2022-04-02 2022-04-02 Power transmission tower foundation slip safety evaluation method, system, equipment and medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210351214.8A CN116957183A (en) 2022-04-02 2022-04-02 Power transmission tower foundation slip safety evaluation method, system, equipment and medium

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Publication Number Publication Date
CN116957183A true CN116957183A (en) 2023-10-27

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