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中文摘要：
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。
英文摘要：
Building undergo torsional excilations during an earthquake. But torsional earthquake input is not clear in building design by now. To estimate the torsional input of structures caused by earthquake, a simplified method is presented. The torsional ground motion, the torsional foundation input and their differences are discussed. It shows that the ratio of foundation length to the apparent earthquake wavelength and the ratio of foundation length to width affect the difference. A formula of torsional earthquake input of a structure is suggested for engineering structure purpose.
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