摘要
采用频域法进行空间结构的风振响应分析时,计算参数的合理确定依然存在不同的看法.文中结合对频域法计算过程的阐述,重点指出了直接影响计算结果的主要参数,包括参与组合振型的数量、振型耦合项的取舍、竖向脉动风效应、相关函数的选择和结构尼比等.文中系统回顾了这些参数确定的不同做法,并进行了分析和探讨.最后通过两个典型的空间网格结构(一球面网壳和一柱面网壳)算例分析,从数值的角度来说明这些参数不同取值对结构风振响应计算结果造成的差异.
Wind-induced vibration analysis of spatial lattice structures is still inconsistent in reasonable parameter determinations when using conventional frequency-domain method. The basic computational process of frequency-domain method is presented in order to highlight some parameters crucial to results of computation, including number of contributing modes, coupling terms between modes, vertical fluctuating components of wind, coherence function and structural damping ratio. Perspectives to the value determinations of those parameters are generally reviewed to reach an integral understanding for engineers. Two illustrative examples of typical spatial lattice structures, a spherical and a cylindrical lattice shells, are analyzed detailedly to show their numerical differences to responses of wind-induced vibration.
出处
《空间结构》
CSCD
2004年第4期36-43,共8页
Spatial Structures
基金
国家自然科学基金资助项目(50108014).
