Fatigue testing of butt-welded high strength square hollow sections strengthened with CFRP

被引：23

作者：

Amraei, Mohsen ^{[1
]}

Jiao, Hui ^{[2
]}

Zhao, Xiao-Ling ^{[1
]}

Tong, Le-Wei ^{[3
]}

机构：

[1] Monash Univ, Dept Civil Engn, Clayton, Vic 3168, Australia

[2] Univ Tasmania, Sch Engn & ICT, Hobart, Tas 7001, Australia

[3] Tongji Univ, Coll Civil Engn, Shanghai 200092, Peoples R China

来源：

THIN-WALLED STRUCTURES | 2017年 / 120卷

基金：

澳大利亚研究理事会;

关键词：

High strength steel; Heat affected zone; Hardness; Residual stress; Fatigue; CFRP strengthening; STEEL TUBES; BEHAVIOR; CAPACITY; CONNECTIONS; COLUMNS; FAILURE; MEMBERS; CARBON; BEAMS;

D O I：

10.1016/j.tws.2017.09.004

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This paper presents a study on the residual stress, hardness and fatigue behaviour of butt-welded high, strength square hollow section (SHS) steel tubes strengthened with carbon fibre reinforced polymer (CFRP). SHS tubes, with a nominal yield stress of 780 MPa and an ultimate tensile strength of 860 MPa, were butt-welded using the Gas Tungsten Arc Welding (GTAW) welding method. The hardness in the heat affected zone (HAZ) dropped to around 80% of that of the parent metal of the SHS steel. The strength in HAZ of the butt-welded SHS tubes is about 93% of that of the parent metal of the SHS tube. The residual stress of the butt-welded SHS tubes is about 20-50% 25-45%of the yield stress along the longitudinal direction and 15% of the yield stress along the transverse direction. The fatigue life of CFRP strengthened butt-welded SHS beams was extended for about 5 times comparing to the butt-welded beams without CFRP strengthening.

引用

页码：260 / 268

页数：9

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