Post-fire behaviour of slender reinforced concrete columns confined by circular steel tubes

被引:70
作者
Yang, Hua [1 ,2 ]
Liu, Faqi [1 ,2 ,3 ]
Gardner, Leroy [3 ]
机构
[1] Harbin Inst Technol, Key Lab Struct Dynam Behav & Control, Minist Educ, Harbin 150090, Heilongjiang, Peoples R China
[2] Harbin Inst Technol, Sch Civil Engn, Harbin 150090, Heilongjiang, Peoples R China
[3] Univ London Imperial Coll Sci Technol & Med, Dept Civil & Environm Engn, London SW7 2AZ, England
关键词
Circular steel tube confined reinforced concrete; Experiments; Post-fire; Residual capacity; Slender column; Testing thermal distribution; FIRE RESISTANCE; TUBULAR COLUMNS; STRENGTH; EXPOSURE; TEMPERATURE; DESIGN;
D O I
10.1016/j.tws.2014.10.014
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The post-fire behaviour of slender reinforced concrete columns confined by circular steel tubes is investigated experimentally and numerically in this paper. Experiments were performed firstly to explore the fundamental behaviour of steel tube confined reinforced concrete (STCRC) slender columns after exposure to the ISO 834 standard fire, including the cooling phase. Temperature distributions, load versus lateral displacement curves, strains in the steel tube and failure modes were obtained and discussed. Next, a 3D finite element model was developed with the program ABAQUS using a sequentially coupled thermal-stress analysis. After validation of the FE model, parametric studies were carried out to identify the influence of key parameters on the load-bearing capacity and budding reduction factor of slender STCRC columns. The considered parameters were the heating time, cross-sectional dimension, slenderness ratio, material strength, steel tube to concrete area ratio and reinforcement ratio. Finally, a simplified design method was proposed for predicting load-bearing capacity of STCRC slender columns after exposure to standard fires. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:12 / 29
页数:18
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