单层球面网壳风振分析的时域法与频域法比较  

Comparison of Wind-induced Vibration Analysis of Single-layer Spherical Latticed Shells Between Time Domain Method and Frequency Domain Method

作　　者：李杰[1] 倪振华[1] 谢壮宁[1] 

机构地区：[1]汕头大学土木工程系,广东汕头515063

出　　处：《建筑科学与工程学报》2008年第2期45-50,共6页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(50778108);国家自然科学基金项目(50378052)

摘　　要：根据风洞试验同步测量的风压数据,分别采用时域Newmark-β法、频域完全二次型组合法以及平方总和开方法计算单层球面网壳结构的节点峰值竖向位移响应,对3种方法的计算精度、计算时间等进行了比较;并且给出了一种离散荷载时间序列的新途径,即应用本征正交分解技术将脉动风荷载分解为空间协方差模态和主坐标,对主坐标时间序列利用三次样条插值函数离散成新的风荷载时间序列。分析结果表明:频域完全二次型组合法在进行屋盖风振分析时耗时少,计算效率高。Based on the wind pressure data synchronous measured from wind tunnel tests, me peak vertical displacement responses of nodes on a single-layer spherical latticed shell structures were calculated by Newmark-β method in the time domain, complete quadratic combination （CQC） method and square root sum of square （SRSS） method in the frequency domain respectively. The characteristics of accuracy and computation time of three kinds of methods were compared. Moreover, a new approach to interpolate the time-series of loading was presented in which the fluctuating wind loads were separated into space covariance modes and principle coordinates by using proper orthogonal decomposition technique, then the time-series of principle coordinates were interpolated in terms of cubic splines function to form a new time-series of wind load. The analysis results show that CQC method has low time consuming and high computing efficiency in roof wind-induced vibration analysis.

关 键 词：单层球面网壳 风致响应 NEWMARK-Β法 完全二次型组合法 本征正交分解 

分 类 号：TU311.3[建筑科学—结构工程]