火灾下钢骨混凝土柱极限承载力简化计算方法  

A PRACTICAL METHOD FOR CALCULATING THE ULTIMATE BEARING ABILITY OF SRC COLUMNS IN FIRE

作　　者：蒋东红[1] 王世伟[1] 郑浩[1] 徐兴华[1] 李国强[2] 

机构地区：[1]宝山钢铁股份公司技改工程管理部,上海201900 [2]同济大学土木工程学院,上海200092

出　　处：《工业建筑》2006年第z1期562-566,共5页Industrial Construction

基　　金：国家杰出青年科学基金资助项目(50225825)

摘　　要：钢骨混凝土柱是多高层建筑结构中常用的基本构件,火灾下由于截面温度分布不均匀,其相对准确的极限承载力需利用非线性有限元方法求解,非常繁琐。通过不同温度区段混凝土和钢材强度的折减情况,将温度分布不均匀的截面变换成等效的常温截面,对高温下构件极限承载力进行近似计算,计算结果与有限元求解结果接近,可供工程抗火验算参考。SRC columns is the fundamental member in high building.Because of the distribution of temperature over the cross section being not evenly,non-liner finite-element analysis method should be used to gain the accurate result and it is very arduous.Based on the condition of concrete strength and steel strength in different temperature area,a practical method for calculating the ultimate ability of SRC columns at high temperature is put forward by changing the cross section which the distribution,in of temperature is not evenly into the equivalent cross section at normal temperature.The reliability of this method is validated by the good agreement between the theoretical result and that by FEM.

关 键 词：钢骨混凝土柱 高温极限承载力 等效截面 简化计算 

分 类 号：TU398.9[建筑科学—结构工程]