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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。
The lateral stiffness of the super high-rise building structure is small, and the horizontal displacement of the structure under the action of wind load is larger, and the horizontal displacement is further increased by the action of gravity. This phenomenon is called the wind-heavy coupling effect. Due to the complexity of the mechanism of action, the wind-load coupling effect of transverse wind loads is related to structural safety. The dynamic equation of structure, which is included in the influence of gravity, is established. By using the equivalent linear method, the stochastic wind-induced response under the transverse wind direction can be solved. The results show that the gravity stiffness ratio is a decisive factor. When the average wind speed is small, the displacement response of the structure increases with the increase of the parameter value. When the average wind speed increases, the displacement response of the structure first increases and then decreases with the increase of the average wind speed. For the rectangular section of super high-rise buildings, when the aspect ratio is less than 2, the lateral wind load and gravity coupling effect decreases first and then increases with the aspect ratio. As an important factor, the cross-wind coupling effect must be considered in the design of super high-rise buildings.