摘要
超高层建筑结构侧向刚度较小,风荷载作用下结构水平位移较大,重力作用则进一步加大水平位移,该现象称为风重耦合效应。横向风荷载由于作用机理的复杂性,其风重耦合效应问题关系到结构安全性。建立计入重力影响的结构动力方程,利用等效线性法,可求解横风向激励下的随机风振响应。结果表明:重力刚度比是一个决定性因素,当平均风速较小时,结构位移响应随着该参数值增长而增长;而当平均风速加大时,结构位移响应随着其增长先增大后下降。对于矩形截面的超高层建筑,当深宽比小于2时,横向风荷载与重力耦合效应先随深宽比减小而后增大。横风向的风重耦合效应作为一个重要因素必须在超高层建筑结构设计中加以考虑。
Horizontal displacement of super high-rise buildings caused by wind load is increased by gravity due to relatively low lateral stiffness. This phenomenon is known as the wind-gravity coupling effect（ WGCE）. WGCE under cross-wind is important to safety of structures since the mechanism of cross-wind load is complex. Random response excited by cross-wind can be calculated by dynamics equations including WGCE and equivalent linear method. The results show that the gravity-rigidity ratio is an important factor. The displacement response of structures increases with gravity-rigidity ratio as average wind speed is low. When the average wind speed becomes great,displacement response of structures increases with gravity-rigidity ratio first,then decreases. As for super high-rise buildings with rectangular section,WGCE decreases with aspect ratio first and then increases when the aspect ratio of section is less than 2.WGCE of cross-wind should be taken into account as an important factor when designing structures of super high-rise buildings.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2016年第10期108-115,共8页
Journal of Building Structures
基金
国家自然科学基金项目(51378468)
关键词
超高层建筑
风重耦合效应
非线性振动
横向风
随机风振响应
super high-rise building
wind-gravity coupling effect
nonlinear vibration
cross-wind
random wind vibration
