length Fatigue tests and design of CFRP-strengthened CHS gap K-joints

被引：23

作者：

Tong, Lewei ^{[1
,2
]}

Xu, Guowen ^{[1
,3
]}

Zhao, Xiao-Ling ^{[4
]}

Yan, Yang ^{[5
]}

机构：

[1] Tongji Univ, State Key Lab Disaster Reduct Civil Engn, Shanghai 200092, Peoples R China

[2] Tongji Univ, Zhejiang Coll, Dept Civil Engn, Jiaxing 314051, Peoples R China

[3] China Construct Eighth Engn Div Co Ltd, Shanghai 200112, Peoples R China

[4] UNSW Sydney, Dept Civil & Environm Engn, Sydney, NSW 2052, Australia

[5] China Railway Shanghai Design Inst Grp Co Ltd, Shanghai 200070, Peoples R China

来源：

THIN-WALLED STRUCTURES | 2021年 / 163卷

基金：

国家重点研发计划;

关键词：

Carbon fibre-reinforced polymer; CFRP strengthening; Circular hollow section gap K-joint; Fatigue test; S-N curve; CRACKED STEEL BEAMS; GUSSET JOINT; T-JOINTS; BEHAVIOR; CONNECTIONS;

D O I：

10.1016/j.tws.2021.107694

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This paper presents an experimental study on the fatigue behaviour of circular hollow section (CHS) gap K-joints strengthened by carbon fibre-reinforced polymer (CFRP) sheets (CFRP-CHS K-joint). Eight CFRP-CHS K-joints and three reference un-strengthened CHS gap K-joints were tested under cyclic axial loading. Fatigue failure modes of the CFRP-strengthened and un-strengthened joints were determined and compared. Fatigue lives in three fatigue failure criteria were recorded: crack-initiation fatigue N-2, through-thickness fatigue N-3, and end-of-test fatigue N-4. The comparisons indicate that CFRP-CHS K-joints have a longer fatigue life than un-strengthened joints in the same nominal stress range, regardless of fatigue failure criteria (N-2, N-3, or N-4). The increase in N-3 was approximately 138%, on average. No significant difference in fatigue data in terms of hot spot stress range was found between the CFRP-strengthened and un-strengthened joints. Based on the experimental fatigue data, a modified S-r,S-hs-N curve based on the CIDECT recommended curve was proposed for CFRP-CHS K-joints.

引用

页数：16

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