钢管混凝土叠合柱单面受火性能分析

Performance Analysis of Concrete Filled Steel Tube Reinforced Concrete( CFSTRC) Columns Subjected to One- side Fire

基于ABAQUS有限元分析平台,对钢管混凝土叠合柱单面受火下的耐火性能进行系统的研究。合理确定钢材和混凝土的热工参数和热力学性能参数,利用热-力耦合分析方法,建立钢管混凝土叠合柱的温度场和力学分析模型;利用现有相关试验数据对模型进行验证,二者符合较好。在此基础上,对钢管混凝土叠合柱单面受火时的温度分布、耐火性能、破坏模态以及钢管与核心混凝土及外部钢筋约束混凝土之间接触性能的变化进行研究,为完善钢管混凝土叠合柱耐火性能分析的理论体系提供基础。

In this paper, the performance of concrete filled steel tube reinforced concrete （ CF-STRC ） columns under one-side fire is studied systemically based on the finite element software ABAQUS platform. On the basis of determination of reasonable thermal parameters and material models under high temperature, finite element models to study the temperature field and me-chanical performance of CFSTRC columns under one -side fire were established by using the module of heat-force coupling. The calculated results by numerical model were compared with some test’ s results, and there are good agreements. On this basis, preliminary analysis on the temperature distributions, fire resistance performance, failure modes and the interaction between tube and concrete of CFSTRC columns were carried out. The results in this paper can provide references for establishing completely theoretic system of the fire performance of CFSTRC col-umns.