劲性支撑穹顶结构风振响应分析  

Wind-induced response analysis of rigid bracing dome

作　　者：薛素铎[1] 何永发[1] 高占远[1] XUE Su-duo HE Yong-fa GAO Zhan-yuan(Spatial Structures Research Center, Beijing University of Technology, Beijing 100124, China)

机构地区：[1]北京工业大学空间结构研究中心,北京100124

出　　处：《空间结构》2016年第4期35-43,共9页Spatial Structures

基　　金：国家自然科学基金项目(51378031);北京市自然科学基金项目(8132022)

摘　　要：劲性支撑穹顶结构是一种刚柔结合的新型预应力空间结构,具有跨度大、自重轻等特点.利用线性滤波器法中的AR法,结合结构风压谱随高度变化规律,编制了脉动风速时程模拟程序.采用时域分析方法,研究了劲性支撑穹顶结构在水平风和竖向风单独作用及共同作用下的响应,并分析了初始预应力、矢高、跨度及环向等分数对结构风振响应的影响.研究表明,水平风与竖向风共同作用下结构节点位移均值位于两者单独作用于结构时的位移均值之间,预应力对结构风振响应的影响显著,节点位移响应均值随矢高或跨度增加而变大,环向等分数减小会导致结构的竖向位移响应均值及幅值增大.将风振系数进行统计分析,得到了便于工程设计人员应用的风振系数.Rigid bracing dome,which combines rigid structure and flexible structure,is a new type of prestressed spatial structure.Features of this structure,such as long span,light weight and small vertical stiffness make it sensitive to wind load.Simulation program of time history of fluctuating wind velocity is completed by linear filter method,in which the spatial correlation of wind speed is considered,and the characteristics of wind pressure power spectrum changing with height of the structure are combined.The wind vibration response analysis of the structure is conducted by time domain analysis method.Study on response of the structure under horizontal wind and vertical wind alone or under the joint action is carried out.The influence of wind vibration response of structure under different initial pre-stress,rise,span and division of ring direction is analyzed.The research shows that,the effect of pre-stress on wind vibration response of the structure is obvious,and increasing pre-stress can reduce the vertical displacement of the mid-span node effectively.With the increase of rise or span,mean value of nodal displacement is larger.With the decrease of division of ring direction,mean and amplitude values of the vertical displacement increase.Statistical analysis of the wind vibration coefficient is carried out.

关 键 词：劲性支撑穹顶 风速时程模拟 参数分析 风振响应 

分 类 号：TU394[建筑科学—结构工程]