Abstract

This paper presents the finite element (FE) analysis and modeling of square concrete-filled steel tube (CFST) members subjected to a flexural load at ambient and elevated temperature. The commercial FE tool ANSYS was used in the 3D modeling taking into consideration material and geometric non-linearities. The developed FE model can accurately predict the ultimate moment capacity of the square CFST members subjected to flexural loads and fire resistance time. A parametric study is conducted using the verified FE model to study the effect of the compressive strength of infilled concrete and the yield strength of the steel tube on the flexural behavior of the square CFST members. The ultimate bending capacity of the CFST members increases by up to 27% when the yield strength of the steel tube increases from 210 MPa to 400 MPa while its fire resistance time decreases. For a D/t ratio equal to 30, the flexural capacity increases by 20% when the compressive strength of the infilled concrete increases from 60 MPa to 100 MPa, while it shows increase in fire resistance time.

Highlights

  • The use of concretefilled steel tube (CFST) columns and beams in constructing buildings has increased exponentially in the recent decades [1,2]

  • Based on the research gaps in the area of flexural performance of CFST beam at ambient and elevated temperature, this study aims to investigate the flexural behavior of CFST beams numerically by using the commercial finite element analysis (FEA) package ANSYS [9]

  • The ultimate flexural load of the square CFST beam increased by 27% with the increasing in the steel yield strength from 210 MPa to 400 MPa

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Summary

Introduction

The use of CFST columns and beams in constructing buildings has increased exponentially in the recent decades [1,2]. Hu et al [7] proposed a material constitutive model for circular CFST columns subjected to pure bending They performed a finite element analysis (FEA), validated the theoretical results with the experimental data, and concluded that concrete is an ideal material that resists compressive loading in typical applications when the depth-to-thickness (D/t) ratio is greater than 74. Based on the research gaps in the area of flexural performance of CFST beam at ambient and elevated temperature, this study aims to investigate the flexural behavior of CFST beams numerically by using the commercial FEA package ANSYS [9] This investigation employs the FEA modeling technique taking into consideration the interaction of concrete and steel, non-. The numerical analysis is extended to perform a parametric study on the effects of the compressive strength of concrete and the yield strength of steel on the performance of CFST beams under flexural loads

General
Material modeling
Concrete
Interface
Model verification
Ultimate strengths of CFST beams
Effect of concrete grade
Parametric study
Findings
Conclusions
Full Text
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