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Study on the Bond-Slip Performance of CFSSTs Based on Push-Out Tests

Authors :
Lai Wang
Haitao Chen
Jitao Zhong
Huirong Chen
Wei Xuan
Shuai Mi
Hongyan Yang
Source :
Advances in Materials Science and Engineering, Vol 2018 (2018)
Publication Year :
2018
Publisher :
Hindawi Limited, 2018.

Abstract

To study the interfacial bond-slip performance of concrete-filled square steel tubes (CFSSTs), taking the core concrete strength, slenderness ratio, and width-to-thickness ratio as the influencing factors; 9 specimens were designed with 3 factors and 3 levels for the orthogonal test method. In addition, different from the above 9 specimens, one specimen without rust removal was designed for the purpose of comparison. Based on the bond stress distribution and deformation coordination relationships between the specimens during the push-out tests, a theoretical formula for calculating the relative slip of a CFSST was deduced. The results show that with the increase of load, the relative slip at the loading ends was earlier than that at the free ends of the specimens; the interfacial bond failure and relative slip gradually developed from the two ends towards the centre of the specimens; the increase of the bond stress in the middle part was faster than that at the ends of the specimens. The order of these factors from main to secondary is the presence of rust in the inner wall of the square steel tube, the slenderness ratio, the core concrete strength, and the width-to-thickness ratio.

Details

Language :
English
ISSN :
16878434 and 16878442
Volume :
2018
Database :
Directory of Open Access Journals
Journal :
Advances in Materials Science and Engineering
Publication Type :
Academic Journal
Accession number :
edsdoj.4c127c1f048f417d9dca150c988cde94
Document Type :
article
Full Text :
https://doi.org/10.1155/2018/2959827