火灾温度场下约束钢柱的结构响应分析  

Thermal Response of Restrained Axially Compressed Steel Column Under the High Temperature of Fire

作　　者：王学夫 郑小尧[2] 王新堂[2] 丁勇[2] 

机构地区：[1]浙江省二建钢结构有限公司,浙江宁波315207 [2]宁波大学建筑工程与环境学院,浙江宁波315211

出　　处：《宁波大学学报（理工版）》2009年第2期276-280,共5页Journal of Ningbo University：Natural Science and Engineering Edition

基　　金：浙江省科技计划项目(面上重点)(2008C23013);宁波市自然科学基金(2007A610060)

摘　　要：假定火灾温度场为国际标准火灾曲线,考虑钢材热工参数的非线性及几何非线性对其热响应的影响,利用有限元方法计算分析了H型钢柱在不同温度分布场下随温度变化的应力、位移等结构响应.研究结果表明:H型钢柱在均匀温度场下与非均匀温度场下的应力、位移等热响应的变化规律截然不同,且均匀温度场下的结构响应解相对偏小,因而在轴心受压钢柱的抗火设计中应考虑非均匀温度场实际情况对设计的影响,从而提出对现行抗火设计规范中假设均匀温度场的抗火设计要求及规定应进行适当的补充和完善.Based upon the assumption that the varying temperature field on the steel component is in agreement with ISO834 temperature curves, and considering the influence of material nonlinearity and geometric nonlinearity on the thermal response of steel component, the finite element method is employed to compute the thermal response of steel components under the different temperature fields, including the model of failure, the stresses and displacements of the component. The computational results show that the thermal response of steel H-column without protection for fire-resistance under uniform temperature field is quite different from that under non-uniform temperature field, and the thermal response of uniform temperature field is rather smaller. It suggests that the influence of the non-uniform temperature field upon the fire-resistant design of axially compressed steel column should be taken into consideration, and the corresponding requirements and provisions of the present code for fire-resistant design is to be amended.

关 键 词：火灾温度场 H型钢柱 热响应 

分 类 号：TU352.5[建筑科学—结构工程]