单层球面网壳结构的风振及其参数分析

大跨度网壳结构日趋多样化、大型化、复杂化．风荷载常常起主要甚至决定性作用，风振动力响应特性研究日益受到关注与重视．目前，网壳结构的抗风设计参数取值方法尚不完善，大多沿用高层或高耸结构设计规范．本文讨论了网壳结构风振响应的时程分析计算方法，并利用节点位移风振系数、单元内力风振系数等概念来衡量网壳结构风振特性．对一类K6—6型单层球面网壳结构进行了包括几何参数、结构参数、阻尼比参数、边界约束参数、平均风速参数等多种工况的风振特性参数影响分析，得出该类单层球面网壳结构在上述各种参数工况下风振系数的变化规律，为单层网壳结构抗风设计、防灾分析提供一定参考．

Wind-induced vibration and parametric analysis of single-layer reticulated shell structures

Due to their outstanding advantages, long-span reticulated shell structures are widely used in constructions, and become longer, more diversified and complicated than before. Wind load is always the major or even the most important load applied on such structures. So, dynamic response of reticulated shell structures under wind load is paid more and more attention to. Currently, the methods for determining the wind-resistant design parameters of reticulated shell structures are not complete, most of which follow the design code applicable to the high-rise buildings. In this paper, computational method of wind-induced vibration response of reticulated shell structures in time domain is discussed. Several concepts including wind-induced vibration coefficient of nodal displacement and wind-induced vibration coefficient of internal force for element are used to evaluate the vibrating characteristics of such structures. Parametric analysis of wind-induced vibration of a batch of K6-6 type single-layer dome shells under different cases, including geometric parameters, structural parameters, damping ratio parameters, boundary conditions and average wind speed parameters, is carried out. Some wind-induced vibration rules are obtained and can be for the reference of the wind-resistance design and disaster prevention analysis of reticulated shell structures.