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高层结构地震输入的合理性对结构抗震设计及地震反应产生重要影响。本文以一典型高层框架结构及其所处场地为参考,建立有软弱夹层场地模型及具有同一卓越周期均匀场地模型,研究该软夹层基础对结构地震输入的影响。由于软弱夹层的存在本文采用了有别于传统的分段等效线性化方法预测地震输入,并与传统的等效线性化方法预测的地震输入对比,研究两种等效线性模型地震输入的差异及软弱夹层存在对地震输入的影响。进一步基于预测地震动分别计算了有无软弱夹层存在下该典型高层框架结构反应,研究软弱夹层存在对结构地震反应的影响。本文结果显示虽然软弱夹层存在会使结构地震动输入时程峰值变低,但结构反应却加剧。分段等效线性化输入模型的地震动加速度峰值普遍大于传统等效线性化模型,但传统等效线性方法预测的地震动计算所得的结构反应更加剧烈。
The rationality of seismic input to high-rise structures has an important impact on the seismic design and seismic response of structures. Based on a typical high-rise frame structure and its site, this paper establishes a model of a weak interlayer and a uniform uniform site model with the same excellent period to study the influence of the soft interlayer foundation on structural seismic input. Because of the presence of weak intercalation, this paper adopts a method different from the traditional piecewise equivalent linearization method to predict the seismic input. Compared with the earthquake input predicted by the traditional equivalent linearization method, the difference of the seismic input between the two equivalent linear models And the effect of weak interlayer on seismic input. Based on the predictions of ground motions, the typical high-rise frame structures in the presence of weak sandwiches were calculated, and the influence of weak sandwiches on the seismic response of structures was studied. The results show that although the existence of weak interlayer will make the peak value of structural ground motion input lower, the structural response is aggravated. The peak ground motion acceleration of the sectionally equivalent linearized input model is generally larger than that of the traditional equivalent linearization model, but the structural response predicted by the traditional equivalent linear method is even more intense.