门式刚架风荷载系数取值对比分析

Comparative Analysis of Wind Load Coefficient of Portal Rigid Frame

门式刚架对风荷载较为敏感,现行规范中对风荷载的取值存在差异。这种基础数据的实质不同直接影响了的结构的安全度。论文以深圳地区的封闭式双坡屋面门式刚架轻型房屋为例,通过计算不同跨度、柱距的门式刚架,对构件内力、柱脚反力结果的差异进行对比,结果发现大多数工况由恒活荷载控制。在风荷载控制的组合中,除柱脚拉力外,采用荷载规范较门刚规范有一定程度的提高。

Portal frames are more sensitive to wind loads,and there are differences in the values of wind loads in current regulations.The substantial differences in basic data directly affect the safety of the structure.This article takes a closed double slope roof portal frame light house in Shenzhen as an example.By calculating portal frames with different spans and column spacings,the differences in internal force and column base reaction results of the components are compared.The results show that most working conditions are controlled by constant live loads.In the combination of wind load control,except for the column base tension,the use of load specifications has a certain degree of improvement compared to the portal frame specifications.