建筑结构学报2024，Vol.45Issue(7)：200-211,12.DOI:10.14006/j.jzjgxb.2022.0740
增强约束拼合式轻型钢-混凝土组合柱抗火性能试验研究
Experimental study on fire resistance of reinforced restrained light steel-concrete composite columns
摘要
Abstract
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.关键词
轻型钢-混凝土组合柱/增强约束/轴心受压/受火试验/有限元分析/抗火性能Key words
lightweight steel-concrete composite column/reinforcement restraint/axial compression/fire test/FEA/fire resistance分类
建筑与水利引用本文复制引用
宋谦益,王卫永,黄浩原,刘宜丰..增强约束拼合式轻型钢-混凝土组合柱抗火性能试验研究[J].建筑结构学报,2024,45(7):200-211,12.基金项目
国家重点研发计划(2019YFD1101003,2020YFD110070). （2019YFD1101003,2020YFD110070）
