Experimental and Analytical Compression Behavior of Stiffened Concrete-Filled Double-Skin Tubular Columns

EasyChair Preprint 13408

Abstract

Concrete-filled double-skin tubular (CFDST) columns with concrete sandwiched between inner and outer steel tube skins form a modern column optimized for a high strength-to-weight ratio compared to traditional reinforced concrete (RC) or steel columns. The innovative addition of stiffened steel tubes with CFDST columns enhances their axial load-bearing capacity, ductility, and residual capacity by delaying or constraining localized deformations in the steel tubes. This study examines the comparative behavior of stiffened CFDST columns provided with flat rectangular stiffeners on the outer circular steel tube versus their unstiffened counterparts under centric compression loading. Detailed nonlinear finite element (FE) models were generated and validated against the test results. Experimental results showed the significant development of concrete confinement due to the presence of stiffeners, enhanced ductility, and residual axial load capacity in stiffened columns compared to unstiffened CFDSTs. The parametric variations on the stiffener width depicted enhancement in peak axial-load bearing capacity up to about 44% compared to unstiffened columns.

Keyphrases: CFDST, axial load bearing capacity, concrete filled double skin steel, experimental study, finite element analysis, steel stiffeners, steel tubes, stiffener

@booklet{EasyChair:13408,
  author    = {Aamir Hassan and Javed Ahmad Bhat and Fayaz Ahmad Sofi},
  title     = {Experimental and Analytical Compression Behavior of Stiffened Concrete-Filled Double-Skin Tubular Columns},
  howpublished = {EasyChair Preprint 13408},
  year      = {EasyChair, 2024}}