【摘要】 选取一系列地震波对同时考虑材料非线性和横缝非连续接触的拱坝进行大量的动力时程分析,以拱冠最大位移为响应参数定义3个性能水准,结合通过结构反应回归分析得到的概率地震需求模型,建立在地震作用下基于拱冠位移的拱坝易损性曲线,比较不同地震动参数表示下概率地震需求模型以及易损性曲线的区别.利用易损性曲线计算拱坝在不同大小地震作用下处于各级性能水准的概率,为基于性能的拱坝抗震安全评价提供了理论依据.更多还原

【Abstract】 Eighteen realistic earthquake records were selected and scaled as the seismic input for a series of dynamic response-history analyses for a high arch dam considering both nonlinearity of material and discontinuous contact of contraction joints in the dam.The dynamic responses of the arch dam under earthquake were assessed to define three performance levels based on the maximum crest deformation.The probabilistic seismic demand models and seismic fragility curves of the arch dam were generated conditioned upon different seismic intensity measures of which the differences were also discussed.The probability of exceeding performance levels for arch dams under various levels of earthquake was calculated,which provides theoretical basis for performance-based seismic safety evaluation of arch dams.更多还原