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本文选取具有一般性的拱式结构简图,就固端拱、二铰拱和三铰拱这三种情形,推演出地震多支点输入时拱的反应的解析结果。利用我国近年获得的两次中强震多点记录,计算了刚性或较刚的一系列回端拱的地震反应。分析突出表明,由于伪静力反应起重要作用,多支点输入较之一致地面运动输入要给出大很多的结果。这些结果对今后拱式结构抗震设计计算规定的修改,将是很有启发意义的。
In this paper, the arched structural diagrams are generalized, and the analytical results of the response of arches with multi-fulcrum input are deduced for the three situations of fixed-end arches, double-arched arches, and triple-arched arches. Using the records of two moderately strong earthquakes obtained in recent years in China, the seismic response of a series of rigid or relatively rigid arches was calculated. The analysis highlights that because the pseudo-static reaction plays an important role, multiple-point inputs give much larger results than consistent ground motion inputs. These results will be very instructive for the future revision of the seismic design calculation requirements for arched structures.