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ARTICLE

Behavior of High Strength Concrete Filled Square Steel Tube Stub Columns with Inner CFRP Tube Under Biaxial Eccentric Compression

Zhijian Yang¹, Guochang Li^1,*, Yan Lang², Zengmei Qiu¹

1 School of Civil Engineering, Shenyang Jianzhu University, Shenyang, 110168, China
2 Department of Building Engineering, Suqian College, Suqian, 223800, China

* Corresponding Author: Guochang Li. Email:

(This article belongs to the Special Issue: Modeling of Heterogeneous Materials)

Computer Modeling in Engineering & Sciences 2021, 127(1), 273-290. https://doi.org/10.32604/cmes.2021.014606

Received 12 October 2020; Accepted 03 February 2021; Issue published 30 March 2021

Abstract

This paper studies the contribution of CFRP (carbon fiber-reinforced polymer) to the mechanical behavior of high strength concrete-filled square steel tube (HCFST) under biaxial eccentric compression. The new type of composite member is composed of an inner CFRP tube and an outer steel tube with concrete filled in the two tubes. The finite element analysis was made by ABAQUS on the behavior of high strength concrete filled square steel tubular columns with inner CFRP circular tube subjected to bi-axial eccentric loading. The results obtained from the finite element analysis were verified with the experimental results. In addition, the load-deflection curves in the whole process were calculated and analyzed, which can be divided into three segments: Elastic phase, plastic phase, descending phase. Based on the load-deflection curves, the stresses analysis on the core concrete, CFRP tube and steel tube were conducted. The confinement effect of the CFRP tube improves the ductility of HCFST-CFRP stub column. CFRP ratio and eccentricity affect the ultimate bearing capacity of HCFST stub column. Finally, a calculation formula of ultimate bearing capacity was proposed in the paper.

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