摘要
为了了解钢管混凝土叠合柱在火灾升、降温段的力学行为,结合有限元分析平台ABAQUS,建立了外荷载和火灾升、降温共同作用下钢管混凝土叠合柱的有限元计算模型,利用相关试验数据对模型进行了验证。基于有限元模型,对钢管混凝土叠合柱在升、降温火灾和外荷载共同作用下的温度场分布、破坏形态、变形特点和内力分布情况等进行了分析。研究表明,高温下外围混凝土的强度下降,钢管承担大部分荷载,在升、降温火灾下钢管混凝土叠合柱发生了内力重分布。
In order to know about the mechanical properties of concrete-encased CFST(concrete-filled steel tube) columns during both the heating and cooling phases of a fire, a finite element analysis(FEA) modeling of concrete-encased CFST columns under the combined load and fire including heating and cooling phases is established using ABAQUS software, and the FEA modeling is verified by relevant test data. Based on the FEA modeling, the temperature distributions, failure modes, deformations and internal force redistribution of concrete-encased CFST columns under both loading and fire exposure are analyzed. The study shows that the most of loads are borne by the steel tube since the strength of the outer concrete is weakened under high temperature, and there is a phenomenon of an internal force redistribution in the concrete-encased CFST column during the heating and cooling fire.
出处
《工程力学》
EI
CSCD
北大核心
2014年第S1期109-114,共6页
Engineering Mechanics
基金
"十二五"国家科技支撑计划课题项目(2012BAJ07B01)
关键词
钢管混凝土叠合柱
火灾
降温段
有限元模型
耐火性能
concrete-encased CFST column
fire exposure
cooling phase
finite element analysis modeling
fire resistance
