局部火灾下钢筋混凝土平面框架结构的耐火性能研究  

FIRE PERFORMANCE OF REINFORCED CONCRETE PLANE FRAME EXPOSED TO LOCAL FIRE

作　　者：王广勇[1] 韩林海[1] 

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《工程力学》2010年第10期81-89,共9页Engineering Mechanics

基　　金：国家自然科学基金项目(50738005);国家科技支撑计划子课题(2008BAJ08B014-07)

摘　　要：该文建立了局部火灾下钢筋混凝土平面框架结构耐火性能的有限元模型,在此基础上研究了火灾高温下框架结构的变形规律、结构的破坏机制、塑性铰分布规律、受火梁的内力和应力状态。该文分析了框架柱轴压比和火灾发生位置对平面框架结构耐火性能的影响规律,并初步探讨了平面框架结构整体的耐火极限和构件耐火极限之间的关系。A finite element （FE） model for the analysis of reinforced concrete plane frames under local fire is presented in this paper. Deformation and failure mechanism, distribution of plastic hinges, development of the internal forces and stresses of the frame under local fire exposure are analyzed by using the FE model. The influences of axial load level in the frame columns, as well as the fire location on the fire resistance of the frame is analyzed. Finally, the overall fire resistance of the frame and that of the isolated members in the RC frame are compared tentatively.

关 键 词：钢筋混凝土框架 局部火灾 耐火性能 破坏机制 耐火极限 

分 类 号：TU375.4[建筑科学—结构工程]