不锈钢复合钢材焊接方管T形管节点试验研究  

EXPERIMENTAL STUDY ON STAINLESS-CLAD BIMETALLIC STEEL WELDED TUBULAR T-JOINTS

作　　者：杨晓峰 班慧勇[1] 石永久[1] YANG Xiao-feng;BAN Hui-yong;SHI Yong-jiu(Department of Civil Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《工程力学》2024年第S01期50-56,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(52061160485)。

摘　　要：不锈钢复合钢材是一种成本低、强度高、耐腐蚀性能优异的高性能钢材,其在对耐腐蚀要求高的工程结构应用中尤其具有竞争力。该文旨在通过试验,研究不锈钢复合钢材焊接方管T形节点在静力和低周往复荷载作用下的力学性能,设计、制作了4个管节点试件并完成了加载,基于试验结果重点研究了各管节点试件的试验过程、破坏模式、荷载-位移响应和应变发展等;按中国规范GB 50017和欧洲规范EN 1993-1-8进行了节点承载力计算,并与试验值进行了对比。研究结果表明,对于支管承受轴向压力的管节点试件,以主管上表面塑性破坏为主;对于支管承受水平低周往复荷载的管节点试件,以主管上表面塑性变形和主管与支管之间连接焊缝断裂破坏为主;当管节点破坏模式符合现行规范GB 50017和EN 1993-1-8中规定时,相关承载力计算公式仍适用于此类不锈钢复合钢材焊接方管T形管节点的设计计算。Stainless-clad(SC)bimetallic steel is a high-performance steel with low cost,high strength and excellent corrosion resistance,especially competitive in engineering structural applications where high corrosion resistance is required.This paper aims to investigate the structural behaviour of SC bimetallic steel welded tubular T-joint under static axial compression and low-cycle reciprocating loads through experiments.Four welded T-joints were designed,fabricated and tested herein,and the testing process,failure mode,load-displacement curves and strain development of each specimen were analyzed.The bearing capacity was then calculated in accordance with both Chinese standard GB 50017 and European standard EN 1993-1-8,and the experimental values were compared with calculated values to assess performance.The research showed that when the brace was subjected to axial pressure,the specimens mainly failed with local chord plastification;when the brace was subjected to cyclic loading,the specimen failed with plastic deformation of the upper flange of chord and a fracture in the welded brace/chord junctions;when the failure mode of the T-joint complied with the current standards GB 50017 and EN 1993-1-8,the bearing capacity formula could still be applied to the design of SC bimetallic steel welded T-joint.

关 键 词：不锈钢复合钢材 焊接T形管节点 力学性能 试验研究 设计方法 

分 类 号：TU392[建筑科学—结构工程]