中文摘要：

本文详细探讨了建筑结构罕遇地震响应与地震动位移谱之间的关系。通过算例分析,对比了大震弹性与大震弹塑性响应的差异,并通过地震动位移谱解释了差异原因。本文比较了人工地震动与包括汶川地震在内的天然地震动位移谱差异,指出了这种差异将导致罕遇地震作用下长周期结构的人工波计算结果普遍大于天然波计算结果。本文依据地震动位移谱给出了罕遇地震分析时的地震动选取原则。

英文摘要：

This paper discusses the relationship between the seismic responses of building structures and the displacement spectra of ground motions under rare earthquakes.Based on some numerical examples,this paper analyzes the differences between elastic responses and elasto-plastic responses of building structures under rare earthquakes,and presents the reason for the differences from displacement spectra of earthquake ground motions.This paper discusses the displacement spectrum differences between artificial and natural earthquake ground motions,including Wenchuan earthquake ground motion,points out that these differences will make the responses of high-rise building to the artificial earthquake ground motions larger than that to the natural earthquake ground motions under rare earthquakes.This paper presents some principles for earthquake ground motion choosing in rare earthquake analysis.