Study of Structural Strength and Behavior of Concrete Filled Double Skin Columns

Abstract

Column is a major Axial load transferring Member in most of the structures. According to the revised seismic codes columns should be have better flexural strength in addition to the Axial load carrying capacity. It is been a major concern in construction industry in previous few years to increase the column strength. Concrete-Filled Double Skin Tubes (CFDST) is one of the latest innovations in Structural engineeringThe CFDST members were first designed for vessels to resist extreme external pressure but due to its various advantages, it has got strong demand and strong potential for using it in bridges, flyovers and high rise buildings. In this study CFDST is analysed using ABAQUS/CAE 6.11-1 and experimentally tested for stress strain and axial shortening.

Behavior of partial-length stiffened and full-length stiffened CFDST columns under axial load

“…The global stability of these CFDST members is considerably enhanced, due to the presence of inner steel tubes and hence increasing the section modulus of CFDST columns (Elchalakani et al, 2018;Uenaka et al, 2010;Wei et al, 1994). Under various loading conditions, in experimental and finite element investigations, it has been observed that efficient interaction of outer tube, concrete core and inner tube results in better confinement of concrete core, enhanced local and global stability, better ductility and good damping characteristics, compared to CFT columns (Elchalakani et al, 2002(Elchalakani et al, , 2019Han et al, 2007;Hassan and Sivakamasundari, 2014;Shakir-Khalil, 1991;Tao et al, 2003;Yan et al, 2021;Zhao and Grzebieta, 2002). It has also been observed that the performance of CFDST columns, is better than RCC columns (Hassan and Bhat, 2021).…”