单层柱面网壳结构风振系数及其参数分析

摘要

Wind load is one of the major load in design of the long span spatial structures. In this paper , the linear autoregressive filter method is used to simulate the random velocity-time curve , and the three-dimensional wind-induced vibration response history analysis is carried out by the finite element method. In the numerical analysis of the wind vibration coefficient of the structures, the effects of rise to span ratio, long to width ratio and average wind speed are investigated. The wind vibration coefficients calculated by the displacements and the internal forces of members are obtained respectively. The regression formula of the wind vibration coefficients are also obtained for the design of single-layer cylindrical reticulated shell structures.%风荷载作用是网壳结构设计中的主要荷载之一.本文利用线性自回归过滤器法模拟了具有时空相关性的随机风速时程曲线,利用有限元方法对3向网格单层柱面网壳进行了三维风振响应时程分析,系统考虑了矢跨比、长宽比、平均风速等参数对结构风振特性的影响,得出该类结构在上述参数下位移风振系数和内力风振系数的变化规律,并回归出计算公式,为单层柱面网壳的实用抗风设计提供一定参考.