基于本征模态补偿的大跨屋盖脉动风等效静力风荷载  

EQUIVALENT STATIC WIND LOADS OF FLUCTUATING WIND ON LARGE-SPAN ROOFS BASED ON EIGEN-MODE COMPENSATION

作　　者：孙五一[1,2] 周晅毅[1] 顾明[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]中国地质大学工程学院,武汉430074

出　　处：《工程力学》2011年第4期96-101,共6页Engineering Mechanics

基　　金：国家自然科学基金项目(50608060);国家自然科学基金创新研究群体科学基金项目(50621062);科技部科技支撑计划项目(2006BAJ06B05)

摘　　要：在刚性建筑模型风洞测压试验的基础上,该文首先根据脉动风荷载引起的多个等效目标响应而对由结构上脉动风荷载的协方差本征变换得到的本征模态进行补偿,然后提出了一种新的计算线性复杂大跨屋盖脉动风荷载的等效静力风荷载的方法,最后并应用于一实际工程中。计算结果表明该文方法具有物理含义明确、计算方法简单和计算精度较高的优点,能比较有效地避免以前传统方法计算等效静力风荷载的缺陷,可以满足工程设计的需求。Based on the pressure measurements of wind tunnel test on a rigid model,this paper first compensates the eigen-modes of fluctuating wind loads with the covariance proper transformation（CPT） technique according to multiple equivalent target responses induced by the fluctuating wind loads.Then,a new computational method was proposed to calculate the equivalent static wind loads（ESWL） of fluctuating wind loads on those linear and complex large-span roofs.At last,the new method was applied to a real engineering project.The results demonstrate that the new method has the merits of explicit physical meaning,simple computational principle and high computational accuracy;it can also effectively avoid the defects in former traditional methods of computing the ESWL and can satisfy the requirements of engineering design.

关 键 词：大跨屋盖 等效静力风荷载 CPT模态 模态补偿 等效目标响应 

分 类 号：TU311.3[建筑科学—结构工程] TU312.1