非线性损伤谱特征研究(英文)
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摘要
提出了基于Park和Ang损伤模型的弹塑性反应谱(损伤反应谱,简称"RD谱")的研究方法。考虑结构极限状态设计,并通过自编DBRS程序,研究得到了RD谱族;RD谱综合考虑了结构最大弹塑性位移和结构累积滞回耗能的耦合影响,更加合理地反映结构在罕遇地震作用下的弹塑性行为。研究发现RD谱与已有Rμ谱具有类似的特征。通过大量时程分析和拟合得到其回归公式及其相关系数。此外,提倡的RD谱和Rμ谱的定性比较分析,所得结果相对于其它研究结果中是最小的,主要由于两个方面的原因:一是RD谱考虑结构极限状态的情况,二是考虑地震动持时的作用,表明结构抗震设计或评估应当考虑地震动的持时因素。
A procedure of analysis of inelastic response spectra based on Park and Ang damage model,called damage spectra (or "RD" spectra),is proposed.Considering the ultimate limit state of buildings and using Damage-based Response Spectra (DBRS) program,a series of RD spectra are obtained.RD spectra consider both the effect of maximum inelastic displacement and the effect of cumulative hysteretic energy,fairly according with the actual inelastic behavior due to the strong ground motion.Then,some characteristics of RD spectra are found,which are similar with the former Rμ spectra.Due to lots of time history analysis of SDOF oscillators and regression of datum,an expression of RD spectra is constructed.Furthermore,the proposed RD spectra are compared with Rμ spectra qualitatively.The results of this paper have the smallest values compared to other results because of two main reasons.One is the consideration of the ultimate limit state of structure and the other is the consideration of the influence of the duration of ground motions,which deserve more attention during the seismic design or estimation for the structures.
引文
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