A welded joint structure of steel pipe diagonal braces subjected to large eccentric fatigue load

By setting up intermediate steel partitions and internal concrete in the steel pipe diagonal brace welding node structure, and using different welding details designs, the problem of insufficient fatigue strength in the existing node structure under large eccentric fatigue loads is solved, and a higher fatigue life and bearing capacity is achieved.

CN116356941BActive Publication Date: 2025-03-28SHANXI TRANSPORTATION SCI HIGHWAY SURVEY & DESIGN INST +2
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Patent Information

Application Number
CN202310202315.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-03-06
Publication Date
2025-03-28
Estimated Expiration
2043-03-06

AI Technical Summary

Technical Problem

The existing steel pipe oblique brace welded node structure is under large eccentric fatigue load, and the difference in fatigue stress on both sides of the node is ignored, resulting in insufficient fatigue intensity and frequent fatigue cracking problems.

Method used

A steel pipe oblique brace welding node structure is designed. By setting up an intermediate steel partition in the steel pipe section, it is divided into a compressed side and a tensioned side chamber, and concrete is filled in the compressed side chamber. Different welding details and structural designs are adopted to improve the fatigue strength of the compressed side and the tensioned side respectively.

Benefits of technology

It effectively improves the fatigue life and bearing capacity of the node structure, reduces the fatigue stress amplitude of welding details, improves the overall fatigue performance, and solves the problem of low fatigue life in traditional node structure design.

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Abstract

The present invention relates to a steel pipe diagonal brace welded node structure subjected to large eccentric fatigue loads, comprising a steel pipe, a node plate, and concrete filling, wherein the steel pipe can be a square steel pipe, a rectangular steel pipe, and a round steel pipe. The cross section of the steel pipe is divided into two chambers by an intermediate steel partition plate, and the chamber on the compression side is filled with concrete, and the node plate is connected to the concrete by setting holes and passing reinforcing bars. Long strip grooves are opened on the tensile side, the compressive side, and the intermediate steel partition plate of the steel pipe, so that the node plate can be inserted therein and welded thereto, and a circular hole is opened at the end of the long strip groove of the tensile side steel pipe, and the compressive side steel pipe is circumferentially welded to the end of the node plate. The steel pipe diagonal brace welded node structure provided by the present invention can reduce the stress concentration and fatigue stress amplitude of the tensile side welding details, improve the fatigue strength of the compressive side welding details, and generally improve the fatigue life of the steel pipe diagonal brace welded node under large eccentric fatigue loads.
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