Compressive behavior of square LSCFST columns externally strengthened with CFRP strips

Jiongfeng Liang, Liuhaoxiang Wang, Wanjie Zou and Wei Li

Abstract

In this paper, the static mechanical properties of lithium slag concrete filled steel tube (LSCFST) short columns strengthened by CFRP strips are investigated, including experimental study and theoretical analysis. Through the experimental phenomena and data analysis of 17 columns with different parameters, it can be concluded that CFRP strips can effectively delay the buckling of square steel tubes; Contrary to increasing the spacing of CFRP strips, increasing the lithium slag replacement rate and the number of CFRP strips can improve the bearing capacity and ductility of the specimen; The existing methods for calculating the ultimate strength of CFRP strengthened LSCFST columns are compared and suggestions are given; The finite element model of CFRP strengthened square LSCFST short column is established and verified.

Key Words

axial compression capacity; axial pressure; CFRP; lithium slag; short column

Address

Jiongfeng Liang:Faculty of Civil & Architecture Engineering, East China University of Technology, Nanchang, China Liuhaoxiang Wang:Faculty of Architecture, Civil and Transportation Engineering, Beijing University of Technology, Beijing, China Wanjie Zou:College of Civil and Architecture Engineering, Guangxi University of Science and Technology, Liuzhou, China Wei Li:College of Civil and Architecture Engineering, Wenzhou University, Wenzhou, China

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