基于补偿方法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 compensated method

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,湖北武汉430074

出　　处：《振动工程学报》2011年第6期658-663,共6页Journal of Vibration Engineering

基　　金：科技部国家重点实验室基金资助项目(SLDRCE10-B-04);国家自然科学基金创新研究群体科学基金资助项目(50621062)

摘　　要：在刚性建筑模型风洞测压试验的基础上,首先求出脉动风致等效目标响应。然后根据惯性力组合方法求出大跨屋盖的脉动风等效静力风荷载,计算结果表明当模态阶数较少时误差较大。据此,基于等效目标响应和计算响应二者之间的响应差,提出了一种新的补偿方法去计算大跨屋盖脉动风等效静力风荷载,以此来克服模态阶数较少时所带来的较大误差;最后并应用于一实际结构中。计算结果表明补偿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,可以满足工程设计的需求。Based on the pressure measurements of wind tunnel test on a rigid structural model,the equivalent objective responses induced by fluctuating wind were firstly calculated.Then,according to a linear combination method of inertial loads,the equivalent static wind loads（ESWL） of fluctuating wind loads on a large-span roof were obtained,the computational results indicate that the errors are rather large when the numbers of structural modes are inadequate.Hereby,based on the response difference between the equivalent objective responses and computational responses,a new compensated method for computing ESWL of fluctuating wind loads was proposed to overcome the biggish errors produced by only taking inadequate numbers of structural modes into consideration.At last,the new method was applied to a real large-span roof structure.The results show that the method has the merits of explicit physical meaning,simple computational principles and high computational accuracy,which can satisfy the requirements of engineering designs.

关 键 词：大跨屋盖 等效静力风荷载 惯性力 等效目标响应 补偿形式 

分 类 号：TU311.3[建筑科学—结构工程] TU312.1