Behaviour of concrete-filled thin-walled corrugated steel tubes under cyclic axial compression. (May 2021)

• Record Type: Journal Article
• Authors: Fang, Yong; Wang, Yuyin; Zhang, Bing; Dong, Jucan
• Is Part Of: Thin-walled structures. Volume 162(2021)
• Publication Date: 2021-05
• Subjects: Corrugated steel tubes -- Thin-walled steels -- Composite columns -- Plastic strains -- Stress deteriorations -- Cyclic axial loading; Thin-walled structures -- Periodicals; 690.1
• DOI: 10.1016/j.tws.2021.107630
• Languages: English
• ISSNs: 0263-8231

Abstract

Abstract: Concrete-filled thin-walled galvanized corrugated steel tube (CFCST) is a novel composite member with great potential to be used in harsh and corrosive environments as an outdoor pier or an underground structural column, etc. To properly understand the stress–strain performance of such column, this paper presents an experimental investigation on the stress–strain responses of 15 CFCST stub columns subjected to cyclic axial compression. The main variables are diameter-to-thickness ratios of corrugated steel tubes, loading patterns, and unloading/reloading cycles. The test results show that the thin-walled corrugated steel tube can enhance the axial strength and ductility of core concrete significantly. The failure modes, work mechanisms, axial stress–strain responses, plastic strains, and stress deteriorations are examined and addressed in detail. Two existing models, one for monotonic loading and the other for cyclic loading, are employed for comparison. The results show that modifications should be made for better applicability. Highlights: Cyclic axial compression tests conducted on 15 CFCST stub columns. Strain analysis of thin-walled CSTs to examine the work mechanism. Calculation methods proposed for plastic strains and stress deteriorations. Feasibility evaluations of two existing models and suggestions for modification.