重力坝抗震安全评价及配筋效果研究

Study on seismic safety evaluation and reinforcement effect for gravity dam

为研究重力坝闸墩坝段的抗震安全性能及优化钢筋配置方案,按照新版抗震设计规范要求,采用振型分解反应谱法和时程分析方法,进行线弹性动力响应计算。校核该坝的极限承载力并对比验证时程分析和反应谱分析结果。基于Drucker-Prager弹塑性本构模型进行非线性动力分析,对比不同配筋方案的减震效果。结果表明:该闸墩坝能够满足新版抗震设计规范的要求。在闸墩与堰面交界面及坝踵处,配置普通钢筋和在局部应力集中部位配置预应力钢筋,能够有效提高重力坝的抗震性能。

In order to study the seismic safety performance and the optimization reinforcement configuration scheme of the pier dam section of gravity dam, the mode-superposition response spectrum method and time-history analysis method are adopted to calculate the linear elastic dynamic response based on the demand of the new seismic design code. The ultimate bearing capacity of the dam is checked and the results of two methods are compared and verified. The Drucker-Prager elastoplastic constitutive model is used to make the nonlinear dynamic analysis and compare the seismic response reduction of different reinforcement plans. The results show that the pier dam could meet the demand of the new seismic design code. At the interface between the pier and the weir and the dam heel, the ordinary and the prestresse reinforcement are arranged to enhance effectively the seismic of gravity dam. Particularly,the prestresse reinforcement is arranged at the partial stress concentration places.