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Dual-arc steel section structure design method

A cross-sectional structure and design method technology, applied in the field of power equipment, can solve problems such as component buckling

Active Publication Date: 2010-10-06
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problem that the reduction of the stable strength of the transmission tower using hot-rolled angle steel increases with the increase of the steel strength in the prior art, resulting in local buckling of the component, the invention provides a flange overhang optimized by cold bending process The width-to-thickness ratio avoids the reduction of the stable strength of the compression bar, thereby greatly improving the utilization rate of the material strength of the component and the bearing capacity of the section

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Embodiment 1

[0013] Example 1: For the traditional hot-rolled angle steel specification Q345L125×8 commonly used in power transmission towers, the limb plate width L1=125mm, the steel thickness t=8mm, the inner arc radius R=14mm, and the Q345 steel design strength f=310N / mm 2 ; Flange overhang width B = 125mm-8mm-14mm = 103mm, then the flange overhang width-thickness ratio According to technical regulations Stable strength reduction factor of compression bar Stabilization strength was reduced by 9.3%.

[0014] Use the same parameters to calculate the double arc steel section structure, according to the design strength of Q345 steel f=310N / mm 2 And the thickness t=8mm, determine the overhang width of the flange Round the flange overhang width L2=91mm, determined by the cold bending process, the inner arc radius R1=8mm-2mm=6mm of the corner bending part, the outer arc radius R2=R1+8mm=14mm, The length of the reinforcing plate is rounded to L3=28mm. After the above parameters are...

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Abstract

The invention relates to a dual-arc steel section structure design method, in particular to a structure design method for a transmission tower material in the electric power transmission process. The dual-arc steel section structure of the scheme comprises a vertex angle and a limb plate, wherein the vertex angle is a flat reinforcing plate, and the connecting part of the limb plate and the reinforcing plate is in a relative S-shaped arc section. By adopting the cold-bending technology, a reasonable section shape in the optimized material distribution can be produced according to the need; and with the help of the advantages of the traditional hot-rolled angle steel and by combining the cold-bending technology, the dual-arc steel section structure of the scheme adopts a double S-shaped radian design, the ratio of the free extension length to the thickness of a flange plate can be optimized according to the need, the steel strength reduction due to stable strength is reduced, and the strength utilization ratio of member materials is improved. Compared with the traditional hot-rolled angle steel, the structure has better section characteristics through the arc design of the connecting points and the angle-strengthened protruding cold-bending processing, and the section bearing capacity is greatly improved.

Description

technical field [0001] The invention relates to electric power equipment, in particular to a structural design method for power transmission iron tower materials in the power transmission process. Background technique [0002] Hot-rolled angle steel has always been the material of choice for transmission line tower materials in my country. The calculation of the strength, stability and slenderness ratio of hot-rolled angle steel determines the size of its cross-section. The strength calculation of hot-rolled angle steel is related to the The cross-sectional area is directly related, and the stability calculation of the hot-rolled angle steel is related to the stability coefficient of the hot-rolled angle steel, the cross-sectional area and the reduction coefficient of the stable strength of the compression bar m N Directly related, the stability coefficient is closely related to the cross-sectional structural properties of hot-rolled angle steel. With the gradual improvement...

Claims

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Application Information

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IPC IPC(8): E04H12/08
Inventor 韩军科杨靖波杨风利张子富
Owner CHINA ELECTRIC POWER RES INST
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