大跨度空间钢管桁架结构的风振响应和风振控制研究

为了获得大跨度空间钢管桁架结构在风荷载作用下的实时受力、变形情况和风振系数,本文采用自回归法编制计算程序,数值模拟具有空间相关性的大跨度空间钢管桁架结构的多点风速时程,根据由风速时程转化的作用于结构的风荷载时程对两个大跨度空间钢管桁架结构进行风振响应分析和风振系数的计算.结果表明,编制的计算程序可较好地模拟大跨度空间钢管桁架结构的空间点风速时程,计算所得风速时程的功率谱与目标功率谱吻合较好;采用粘滞阻尼器后结构节点位移及杆件应力振动幅值均有所降低,可有效地减小结构的风振响应;根据风振响应的计算结果给出了可供设计参考的结构风振系数.

Study of Wind-Induced Dynamic Response and Wind Vibration Control for Large-Span Spatial Lattice Structure

In order to obtain the distribution of load,displacement and wind vibration coefficient of large-span spatial steel pipe truss structures under wind load,a program based on Auto-Regressive method was worked out to simulate its time history curve of wind speed of multi-points,which bear space relativity. Wind load time history curve was calculated based on wind speed time history curve,and two large-span spatial lattice structures were taken as the examples to process transient analysis.The result shows that the program simulate very well the time history curve of wind speed of large-span spatial steel pipe truss structure's node and the power spectrum of calculated time history of wind speed in conformity to target power spectrum;that the viscous dampers can decrease the displacement of node,stress of element and wind-induced dynamic response of structures;and that the referencable wind vibration coefficients are provided under the calculated results of wind-induced dynamic response.