【摘要】 对一座 LRB隔震桥梁输入了大量具有相同反应谱的地震波 ,通过非线性时程分析发现 ,隔震桥梁地震反应的离散性很大 ,其最大响应对地震动的全过程十分敏感。对隔震桥梁设计时常用的5种等效线性化方法进行了比较研究 ,发现用反应谱法按等效线性模型计算时 ,如果隔震支座延性率不同 ,多数方法计算结果的安全概率也不一样。在工程上常见的延性率范围内 ,这些等效线性化方法的计算结果偏于不安全更多还原

【Abstract】 Through nonlinear time history analysis of seismically isolated bridges with the use of large numbers of seismic waves,which have the same response spectrum,it is found that the maximum response is differs widely.The maximum response of nonlinear structures is sensitive to the total process of seismic ground motion.Five equivalent linear methods for the seismic analysis of seismically isolated bridges have been compared.The study proves that the degree of reliability of results,which are calculated by response spectrum using equivalent linear models,does not remain the same as the bearing ductility ratio varies.In usually ranges of bearing ductility ratio,the results calculated by those equivalent linear methods are not safe.更多还原