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地震时建筑结构会受到扭转地震的影响,但目前结构设计时扭转地震作用尚不明确。为了确定结构的扭转地震作用,提出了一种简化的地震作用下基础扭转的计算方法,探讨了自由场地扭转、基础扭转以及两者的不同。研究表明:基础与视波长的尺寸效应和基础长宽比的尺寸效应造成了上述两者的区别。进而给出了便于建筑抗震设计的扭转地震作用的确定方法。
The building structure will be affected by the reversed earthquake during the earthquake, but the role of torsional earthquake in structural design is not yet clear. In order to determine the torsional seismic action of the structure, a simplified calculation method of foundation torsion under earthquake action is proposed. The differences of free field torsion, foundation torsion and both are discussed. The results show that the size effect of fundamental and apparent wavelength and the size effect of fundamental aspect ratio cause the difference between them. Then, the method of determining the torsional seismic effect for the seismic design of buildings is given.