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Transmission tower structure damage assessment method and system

A technology for transmission tower and structural damage, which is applied in the direction of electrical digital data processing, resources, instruments, etc., can solve the problems of no classification of damage grades for transmission tower structures, difficulty in evaluating the damage location and degree of transmission tower structures, and difficulty in wide application.

Pending Publication Date: 2021-04-02
CHINA ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, there are generally four types of damage indicators for building structures, including strength indicators, deformation indicators, energy indicators, and dual indicators of deformation energy. These indicators are difficult to be directly applied to the transmission tower structure, and it is difficult to evaluate the damage level of the transmission tower structure.
[0003] In terms of damage assessment of transmission tower structures, the main problems are: First, there is no classification of damage levels and corresponding macroscopic phenomena for transmission tower structures
The second is that the current design of the transmission tower structure is based on the stress of the rods, but the number of the rods is large. In practical applications, it is difficult to effectively measure the stress of all the rods, and it is difficult to popularize application
However, the overall displacement is used as the damage index of the transmission tower structure, which has a very large discreteness. The overall displacement of different transmission towers is very different, and it is difficult to evaluate the damage location and damage degree of the transmission tower structure.
The calculation of damage indicators involving energy is cumbersome and difficult to be widely used
Third, damage assessment is the basis for taking effective repair measures. For transmission tower structures, there is currently no effective assessment method, which brings difficulties to the repair of transmission tower structures

Method used

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  • Transmission tower structure damage assessment method and system
  • Transmission tower structure damage assessment method and system
  • Transmission tower structure damage assessment method and system

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Experimental program
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Effect test

Embodiment 1

[0053] combine figure 1 , the present invention provides a method for assessing damage to a transmission tower structure, comprising:

[0054] Step 1: Based on the model constructed for the transmission tower to be evaluated, the internode displacement of the transmission tower is obtained by using the static pushover method to calculate the corrected internode displacement angle of the transmission tower;

[0055] Step 2: Select the maximum corrected internode displacement angle from the internode displacement angle of the transmission tower, and select the damage index through the maximum corrected internode displacement angle;

[0056] Step 3: Evaluate the damage state of the transmission tower structure based on the damage index.

[0057] Among them, step 1: Based on the model constructed for the evaluated transmission tower, the internode displacement of the transmission tower is obtained by static pushover method to calculate the corrected internode displacement angle o...

Embodiment 2

[0077] At present, there is no clear division of damage levels for transmission tower structures.

[0078] According to GB / T 24335-2009 and "China Seismic Intensity Scale" GB / T17742-2008, "Building (Structure) Earthquake Damage Classification" GB / T 24335-2009, buildings are divided into five damage grades, which are basically intact (good), Slightly damaged (light), moderately damaged (medium), severely damaged (severe) and destroyed (destroyed) (National Standards of the People's Republic of China, 2009; National Standards of the People's Republic of China, 2008), five damage levels of macroscopic damage phenomena and earthquakes The harm index is shown in Table 1.

[0079] Table 1 Damage grades and corresponding macroscopic phenomena and earthquake damage index table

[0080]

[0081] For steel frame structures, the damage grades of steel frames are stipulated in the "Earthquake Damage Classification of Buildings (Structures)" (GB / T 24335-2009), which is shown in Table 2...

Embodiment 3

[0134] The AC ZM2 linear tower is the first 1000kV transmission line prototype test tower in China. It has a cat head shape, 8×LGJ-500 / 35 wires, V strings for the middle phase, I strings for the left and right phases, and JLB20A-185 for the ground wire. The maximum design wind speed is 28m / s, the maximum ice coverage is 10mm, the design horizontal span is 530m, the vertical span is 650m, and the minimum vertical span is 200m. The height of the test tower is 59m, the overall height is 79.3m, the root opening is 16.66m, and the tower weighs 59t. The main material of the tower body and the lower crank arm of the tower head are made of Q420 high-strength steel, the maximum specification of the angle steel of the main tower leg is Q420∟200×20, and the whole tower uses 11.8t of Q420 high-strength steel, accounting for 20% of the total tower. The remaining parts are made of circular section steel with a strength of Q235 or Q420. The one-line diagram of ZM2 straight tower includes: m...

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Abstract

The invention provides a power transmission tower structure damage assessment method and system, and the method comprises the steps of obtaining the inter-node displacement of a power transmission tower in a static pushing mode based on a model built for the assessed power transmission tower, calculating the corrected inter-node displacement angle of the power transmission tower, selecting a maximum corrected internode displacement angle from the internode displacement angles of the power transmission tower, selecting a damage index through the maximum corrected internode displacement angle, and evaluating the damage state of the power transmission tower structure based on the damage index; according to the invention, the corrected internode displacement angle is calculated through model building and static pushing and covering, the damage index is selected through the corrected internode displacement angle, and the damage state of the transmission tower structure is effectively obtained through the damage index.

Description

technical field [0001] The invention relates to the field of disaster prevention and reduction in electric power engineering, in particular to a method and system for evaluating damage to a power transmission tower structure. Background technique [0002] At present, there are generally four kinds of damage indicators for building structures, including strength indicators, deformation indicators, energy indicators and dual indicators of deformation energy. These indicators are difficult to be directly applied to the transmission tower structure, and it is difficult to evaluate the damage level of the transmission tower structure. [0003] In terms of damage assessment of transmission tower structures, the main problems are as follows: First, there is no classification of damage levels and corresponding macroscopic phenomena for transmission tower structures. The second is that the current design of the transmission tower structure is based on the stress of the rods, but the ...

Claims

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Application Information

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IPC IPC(8): G06Q10/06G06Q50/08G06F30/13G06F119/14
CPCG06Q10/0639G06Q50/08G06F30/13G06F2119/14
Inventor 王飞黄国朱彬荣杨风利张宏杰汪长智田晓刘海锋李清华胡晓光苏志钢韩军科李茂华夏开全沈祥章立宗姜文东姚一杨毛航银廖海林倪宏宇
Owner CHINA ELECTRIC POWER RES INST
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