Experimental study on fire resistance of reinforced restrained light steel-concrete composite columns

被引：0
|
作者：
Song Q. [1 ]
Wang W. [2 ]
Huang H. [2 ]
Liu Y. [1 ]
机构：
[1] China Southwest Architectural Design and Research Institute Co., Ltd, Chengdu
[2] College of Civil Engineering, Chongqing University, Chongqing
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2024年 / 45卷 / 07期
关键词：
axial compression; FEA; fire resistance; fire test; lightweight steel-concrete composite column; reinforcement restraint;
D O I：
10.14006/j.jzjgxb.2022.0740
中图分类号：
学科分类号：
摘要：
In view of the weak fire resistance of low-rise cold-formed thin-walled steel buildings, a reinforced and restrained light steel-concrete composite column (hereafter referred to as ‘reinforced and restrained composite column’) was proposed for the cold-formed thin-walled wall system. In this study, fire resistance tests of four reinforced and restrained composite column specimens subjected to standard elevated temperature conditions were carried out. The axial displacement, lateral displacement, temperature of measuring points, fire resistance limit and failure mode of each specimen were obtained. The fire resistance analysis model of reinforced and restrained composite columns was established. The model was verified against the experimental data, and then based on the model, the factors affecting the fire resistance of reinforced and restrained composite columns were analyzed. The results show that the load ratio has a great influence on the fire resistance of reinforced and restrained composite columns, the smaller the load ratio, the greater the fire resistance. When the load ratio is 0. 3-0. 7, the corresponding fire resistance of the specimen is 30-105 min. The built-in steel cage used for strengthening restraint also has a significant effect on improving the fire resistance limit of the specimen, and the increase ratio is up to 69% . The fire resistance limit of members increases with the increase of sectional size and decreases with the increase of rivet spacing. The rivet spacing is suggested to be less than 100 mm. © 2024 Science Press. All rights reserved.
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页码：200 / 211
页数：11
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