单索幕墙的风振分析

Wind induced vibration analysis of the single-layer cable glass curtain wall

单索幕墙的刚度较弱,在水平风荷载的作用下易产生较大的变形和振动,抗风设计一直是单索幕墙结构设计中的重点和难点问题。采用数值模拟的方法分析结构位移响应和结构内力响应,得到竖向索由于受到结构自重的影响,其内力变化幅值较小,横向索相对大一些,说明横向索对水平风荷载的抵抗作用更强一些。通过对结构上所有计算点和单元的位移及内力数据进行统计回归,得到适用于模型抗风设计采用的位移风振系数和内力风振系数。这对幕墙的风振分析是一个重要补充。

The single-layer cable glass curtain wall produce deformation and vibration very easily when subjected to horizontal wind loads because of weak rigidity, wind resistant design is a difficult and key problem. Through numerical simulation, structural displacement and internal force are analyzed, the results show that the internal force amplitude of vertical cable changes slightly because of its deadweight, the horizontal cable changes significantly, the horizontal cable resists the horizontal wind load more stronger. The placements and internal force about all nodes and the elements are statistically analyzed, the wind vibration coefficients of displacement and the wind vibration coefficients of internal force are obtained. This is an important complement for wind induced vibration analysis of curtain wall.