基于改进随机地震动模型的概率反应谱

发布时间：2018-04-16 23:11

本文选题：概率谱 + 非弹性位移　；参考：《中南大学学报(自然科学版)》2015年05期

【摘要】：结合我国现行抗震规范(GB 50011—2010),给出一种改进随机地震动模型的相关参数。推导单自由度体系(SDOFS)弹性加速度需求的条件概率模型,进而建立弹性SDOFS的概率加速度需求谱以及概率位移需求谱。在此基础上,据强度折减系数R与延性系数μ之间的关系,确定SDOFS非弹性位移需求的条件概率分布函数,进而运用随机振动理论和概率方法,建立非弹性SDOFS在给定强度地震作用下及50 a设计基准期内的概率位移需求谱。从美国太平洋地震工程研究中心收集大量实测地震记录,基于大量SDOFS动力时程分析的统计结果,对本文方法所得的理论结果进行Monte Carlo数值验证。研究结果表明:该理论方法准确、合理,且计算效率高。
[Abstract]:Based on the present seismic code GB50011-2010, this paper presents the parameters of the improved random ground motion model.The conditional probability model of the elastic acceleration requirement of a single degree of freedom system is derived, and the probability acceleration demand spectrum and the probabilistic displacement demand spectrum of the elastic SDOFS are established.On this basis, according to the relationship between strength reduction coefficient R and ductility coefficient 渭, the conditional probability distribution function of SDOFS inelastic displacement demand is determined, and then the random vibration theory and probability method are used.The probabilistic displacement demand spectrum of inelastic SDOFS during the design reference period of 50 years under the action of a given earthquake intensity is established.A large number of measured seismic records were collected from the Pacific Seismic Engineering Research Center of the United States. Based on a large number of statistical results of SDOFS dynamic time-history analysis, the theoretical results obtained by this method were verified by Monte Carlo numerical method.The results show that the method is accurate, reasonable and efficient.
【作者单位】：中南林业科技大学土木工程与力学学院;湖南大学土木工程学院;
【基金】：国家自然科学基金资助项目(51178175,51274258) 湖南省自然科学基金资助项目(13JJ5027) 高等学校博士学科点专项科研基金资助项目(20124321120006) 长沙市科技计划项目(21597)~~
【分类号】：TU311.3;P315.9

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