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本文参照我国现行《工业与民用建筑抗震设计规范》,讨论了三维坐标系下高层建筑结构地震设计荷载的选取。采用地震惯性力逐层传递求得结构各楼层地震剪力和扭矩,由振子广义位移幅值和备振型的乘积直接给出地震荷载下各振型结构楼层的相对位移。本文方法不仅节省机时、概念清楚,而且为高阶振型对结构各楼层影响的研究提供了有效的依据。此外,还提出按振子能量比选取振型及振型组合所需振型个数和选择合适振型组合法的方法,并在几个算例中均取得较为满意的结果。
This article discusses the selection of seismic design loads for high-rise buildings under the three-dimensional coordinate system with reference to China’s current “Code for Seismic Design of Industrial and Civil Buildings”. The seismic shear force and torque of each floor of the structure are obtained by using the seismic inertial force to transfer layer by layer. The relative displacement of each vibration type structure floor under seismic loading is directly given by the product of the generalized displacement amplitude of the oscillator and the preparation type. This method not only saves time and concept, but also provides an effective basis for the study of the effects of high-order vibration modes on the floors of the structure. In addition, the method of selecting the number of mode shapes required for combination of mode and mode shapes according to the energy ratio of the oscillator and the method of selecting the appropriate mode combination method are also proposed, and satisfactory results are obtained in several examples.