摘要
采用有限元软件ABAQUS建立了标准火灾作用下内配型钢方钢管混凝土柱的热力耦合模型,并与已有的试验进行了对比和验证。计算了该类构件在火灾全过程作用下的荷载-轴向位移、荷载-跨中侧向位移的关系曲线,分析了该类构件在常温加载、升温、降温、火灾后再加载四个阶段的应力变化情况,并将强轴和弱轴两种加载方式下的结果进行了对比。在此基础上,对影响火灾后剩余承载力影响系数的主要参数进行了分析。结果表明:火灾荷载比、升温时间比、长细比等因素对该类构件火灾后剩余承载力有较显著的影响。
A finite element （FE） model of concrete filled square steel tubular column with internal profiled steel under standard fire conditions was developed using ABAQUS software. The FE model was verified with experimental results. The loading versus axial displacement curves were calculated in overall stage fire conditions, and loading versus lateral displacement curves were also studied. The stress distribution was analyzed in loading at the ambient stage, heating stage, cooling stage, and post fire stage. The results under loading at major axis and secondary axis were compared. The main parameters that affected the residual bearing capacity coefficients after exposure to full stage fire conditions were analyzed. The results show that the fire loading ratio, fire duration time ratio, and the slenderness ratio of column have significant effect on the residual bearing capacity.
出处
《工程力学》
EI
CSCD
北大核心
2016年第B06期143-149,共7页
Engineering Mechanics
基金
国家自然科学基金项目(51468037)
甘肃省委组织部"陇原青年创新人才扶持计划"项目
关键词
内配型钢钢管混凝土
偏压构件
火灾全过程
剩余承载力系数
力学性能
concrete-filled steel tubular column with internal profiled steel
eccentric compression
overall stage fire
residual bearing capacity coefficient
mechanical performance
