建筑结构学报2024，Vol.45Issue(3)：148-159,12.DOI:10.14006/j.jzjgxb.2022.0897
受火后内配型钢方钢管混凝土构件抗侧向撞击性能试验研究
Experimental study on lateral impact behavior of square steel-reinforced concrete-filled steel tubular members after exposure to fire
摘要
Abstract
To investigate the lateral impact responses of steel-reinforced concrete-filled steel tubular(SRCFST)members after exposure to fire,tests on nine post-fire specimens under lateral impact were carried out.The effects of heating time,impact height and boundary conditions on the failure modes and impact responses were studied.The temperature field,impact process,failure modes,impact force versus time curves,deflection development and energy absorption of post-fire specimens were all investigated.Based on the equivalent plastic hinge models,a simplified method was proposed to predict the maximum mid-span deflection of specimens under lateral impact.Test results show that post-fire SRCFST specimens under lateral impact experience pronounced bending failure and exhibit good impact resistance.The plateau impact force of SRCFST specimens decreases by 23.9％as the heating time increases from 0 min to 60 min,and the maximum mid-span deflection and impact duration increase by 38.2％and 41.5％,respectively.The maximum mid-span deflection of post-fire specimens increases by 114.7％as the impact height increases from 1.0 m to 2.6 m,whereas the plateau impact force improves by 14.2％.In comparison to concrete-filled steel tubular(CFST)specimens,SRCFST members have higher plateau impact force,less damage and smaller mid-span deflection.The improvement in impact resistance caused by inner section steel is more pronounced for post-fire members than for room-temperature specimens.关键词
内配型钢钢管混凝土/火灾后/侧向撞击试验/破坏形态/抗撞击性能Key words
steel-reinforced concrete-filled steel tube/post-fire/lateral impact test/failure mode/impact resistance分类
建筑与水利引用本文复制引用
纪孙航,王文达,赵晖,王蕊,史艳莉..受火后内配型钢方钢管混凝土构件抗侧向撞击性能试验研究[J].建筑结构学报,2024,45(3):148-159,12.基金项目
国家自然科学基金项目(52168020),兰州理工大学优秀博士学位论文培育计划. （52168020）
