Compressive and flexural behaviour of concrete filled steel tubes after exposure to standard fire

被引:98
作者
Han, LH
Huo, JS
Wang, YC
机构
[1] Fuzhou Univ, Coll Civil Engn & Architecture, Fuzhou 350002, Fujian, Peoples R China
[2] UMIST, Manchester Ctr Civil & Construct Engn, Manchester M60 1QD, Lancs, England
基金
中国国家自然科学基金;
关键词
composite columns; beams; concrete; post-fire; residual strength; hollow sections; bending moment capacity; flexural bending stiffness;
D O I
10.1016/j.jcsr.2004.12.005
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
This paper describes a series of new compression and bending tests carried out on concrete filled steel tubes (CFST) after exposure to the ISO-834 standard fire. A theoretical model that has been previously developed is used to predict the post-fire load versus deformation relationships of CFST stub columns and beams. The predicted curves of load versus deformation are in good agreement with the new test results. The previously developed theoretical model had been used to investigate the influence of a number of important parameters on the residual ultimate strength and flexural stiffness of the composite sections and the results of the parametric studies were used to develop formulas for calculating the composite section residual ultimate strength under axial compression or flexural bending and the composite section residual flexural bending stiffness. In these formulas, the ambient temperature compression resistance, bending moment capacity and initial flexural bending stiffness of the composite section should be calculated using an existing design code. In this paper, these formulas are applied to the new test data to assess the suitability of using several different design codes: AIJ-1997, AISC-LRFD-1999, BS5400-1979, DBJ13-51-2003 and EC4-1994. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:882 / 901
页数:20
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