Journal:Structures

Abstract:The stone prism-encased concrete-filled steel tube (SCFST) column is an innovative composite member formed by embedding waste stone prisms into the concrete core of a conventional concrete-filled steel tube. This configuration reduces cement consumption while utilizing the high uniaxial compressive strength of stone prisms and the lateral confinement of the steel tube, thereby improving both structural load-carrying capacity and material efficiency. Although previous studies have demonstrated the feasibility and mechanical advantages of short SCFST columns, the behavior of slender SCFST columns remains insufficiently understood and requires further mechanism-based investigation. In this study, a refined nonlinear finite element model of slender SCFST columns was developed, and a comprehensive parametric study was conducted to evaluate the influence of key design variables on axial compressive behavior. The results indicate that increasing the steel ratio, stone ratio, concrete compressive strength, and steel tube yield strength enhances the axial load-carrying capacity of the columns, whereas increasing the slenderness ratio significantly reduces it. Through combined numerical simulation and mechanical equilibrium analysis, the load distribution mechanism and the interactions among the steel tube, concrete, and stone prisms are systematically clarified. Finally, a practical design model is proposed to predict the nominal axial compressive stability capacity, with predictions showing excellent agreement with both experimental and finite element results.

Page Number:2026,90:112309

Translation or Not:no

Included Journals:SCI

First Author:张亚康

Co-author:刘杰,叶勇,Wafaa Mohamed Shaban

Correspondence Author:刘阳