高温下组合钢框架应力响应非线性分析  

NONLINEAR FINITE ELEMENT ANALYSIS OF STRESS RESPONSE OF COMPOSITE STEEL FRAME UNDER FIRE

作　　者：曹玉生[1] 冯国明[1] 

机构地区：[1]内蒙古工业大学土木工程学院,呼和浩特010051

出　　处：《钢结构》2015年第4期92-96,共5页Steel Construction

摘　　要：火灾高温对结构钢的材料性能有显著的影响,尤其是对钢结构材料的力学性能影响更加明显,因此而导致结构整体承载能力的显著变化。利用有限元软件ANSYS建立一榀两层两跨钢-混凝土组合梁和钢柱构成的组合钢框架有限元模型,对其在火灾高温下的温度分布和应力响应进行分析。结果表明,受火梁、柱截面温度非均匀分布,非线性变化;梁柱节点是组合钢框架的薄弱环节;受火组合梁内全过程为压应力,未达到屈服应力。Fire high temperature has a significant influence on material properties of structural steel, especially the effect on the mechanical properties of steel structure material is more apparent, which leads to significant changes in the overall carrying capacity of the structure. Finite element software ANSYS was used to establish a FE model of composite steel frame composed of two-layer and two-span steel-concrete composite beam and steel column, and it was analysed its temperature distribution and stress response under the fire high temperature. Temperature of beam and column under fire was a non-uniform distribution, which was changed nonlineary;the beam-column joint was the weak link of composite steel framework; the whole in the course composite beam under fire was compressive stress, and was not up to yield stress.

关 键 词：高温 组合钢框架 有限元分析 温度分布 应力分布 

分 类 号：TU391[建筑科学—结构工程] TU311.3