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Power transmission tower main material joint strength determination method

A power transmission tower, connection strength technology, applied to towers, building types, buildings, etc., can solve the problems of not considering the connection structure strength, not considering the extrusion effect of bolt connection on components, not considering the weakening of stress diffusion, etc., to achieve accurate and practical Stress situation, convenient tower calculation, simple and clear calculation formula

Active Publication Date: 2016-01-27
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The influence of the connection on the structural strength is not considered in the calculation of the main material connection of the traditional iron tower, and the design calculation is directly carried out according to the design strength of the material. The effect of compression, without considering the weakening of the component section after the root cleaning or shoveling of the component after welding, and the influence of stress diffusion on the structure
As a result, the structure cannot achieve the desired effect in terms of safety reserves

Method used

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  • Power transmission tower main material joint strength determination method
  • Power transmission tower main material joint strength determination method
  • Power transmission tower main material joint strength determination method

Examples

Experimental program
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Effect test

Embodiment 1

[0061] like Figure 1-8 As shown, the method for determining the connection strength of the main material of the transmission tower of this example is connected with bolts and connecting plates between the main materials; the method includes the following steps:

[0062] (1) determine the reduction factor of the main material;

[0063] (2) Determine the single-sided shear bearing capacity and single-sided extrusion bearing capacity of a single bolt;

[0064] (3) Determine the effective width of the connecting plate, the net area of ​​the connecting plate, the net area of ​​the inner cladding steel and the net area of ​​the outer cladding steel;

[0065] (4) determine the joint strength of the main material;

[0066] (5) Determine the main material connection form.

[0067] The reduction factor in the step (1) is determined by the length of the connecting section of the main material, and the length is determined by the following formula:

[0068] Lj=(m / s-1)d1\(m / s-0.5)d1(1...

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Abstract

The invention relates to a power transmission tower main material joint strength determination method; the main materials are connected through bolts and connecting plates; the determination method comprises the following steps: calculating a main material joint segment length so as to obtain a reduction coefficient; considering bolt shearing effect, and determining one side shear capacity and one side extruding carrying capacity of the single bolt; utilizing a pole stress diffusion angle to determine a stress diffusion distance, a stress diffusion width, and the width between a stress diffusion edge and the center; determining effective width and net area of the connecting plate, and determining net areas of inner and outer steel-clad so as to calculate the main material joint intensity; calculating the number of the connecting bolts, specifications of the inner and outer steel-clad, and the specifications of the connecting plate, thus determining a final main material connecting form. The power transmission tower main material joint strength determination method can effectively simulate member real force bearing conditions; sketch maps are provided, so the calculating formula is simple and understandable, and the design people can conveniently carry out pole calculation.

Description

Technical field: [0001] The invention relates to a method for determining the connection of main materials, and more particularly to a method for determining the connection strength of main materials of a power transmission tower. Background technique: [0002] In recent years, with the continuous development of transmission lines, the number of transmission towers has increased, and the engineering quality of the towers has attracted widespread attention. The influence of the connection on the structural strength is not considered in the calculation of the main material connection of the traditional iron tower, and the design calculation is directly carried out according to the design strength of the material. The compression effect does not take into account the weakening of the component section after the root cleaning or shoveling of the component after welding and the influence of stress diffusion on the structure. As a result, the structure cannot achieve the expected...

Claims

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Application Information

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IPC IPC(8): E04H12/08
Inventor 房正刚莫娟段舒宁冯国巍杨臻樊宝珍刘铭刘玉杰
Owner STATE GRID CORP OF CHINA
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