混凝土重力拱坝极限抗震能力评价方法初探

从基于性能的抗震设防标准及理论出发，坝体某个关键性能破坏便可能影响大坝的正常运行，单一的评价准则已经不能满足对大坝极限抗震能力评估的要求。针对混凝土重力拱坝的结构特点，基于混凝土弥散裂缝模型，利用地震动超载时域分析方法，从收敛性、地震位移响应突变、塑性区贯通、坝体开裂破坏等方面，对国内某重力拱坝极限抗震能力进行了探讨和研究。研究表明，该重力拱坝的极限抗震能力为0.51g，顶拱中部是坝体相对薄弱的高地震响应区。

Preliminary Study on the Ultimate Seismic Capacity Evaluation of Concrete Gravity Arch Dam

From the performance-based standards and the theory of seismic,the destruction of one critical performance may affect the normal operation of the dam,and a single evaluation criterion can not meet the requirement in the assessment of the ultimate aseismic capacity of dam.Based on concrete smeared crack model adopting overloaded time domain analysis method of Ground motionand considering the structural characteristics,the ultimate aseismic capacity of one domestic concrete gravity arch dam was discussed and studied from the convergence,seismic displacement response mutant,interpenetrate of the plastic zone and failure modes of cracks.The result showed that the ultimate aseismic capacity of gravity arch dam is 0.51g,and high seismic response zone locates in the central section.