基于DCR方法的沉砂池右边墙抗震安全评价

Seismic safety assessment of a desanding basin right wall based on DCR method

本文基于美国陆军工程师兵团EM 1110-2-6053中提出的水工建筑物抗震性能需求能力比(DCR,demand to capacity ratio)评价方法,对某水电站沉砂池综合抗震性能进行了评价。结果表明,在OBE下,沉砂池右边墙的抗剪性能、抗弯性能、抗滑动稳定和抗倾覆稳定性均能满足设计要求。而在MDE下,尽管沉砂池截面抗弯性能良好,但其右边墙的抗剪性能难以满足设计要求,需要对结构断面或配筋进行调整;且其可能发生滑动失稳和倾覆失稳破坏,需要进一步开展非线性动力分析。

Based on the Demand to Capacity Ratio(DCR)approach for seismic performance evaluation of hydraulic structures in EM 1110-2-6053 proposed by US Army Corps of Engineers(U SACE), seismic per formance of a desanding basin right wall is comprehensively evaluated in this paper. The results show that during the operational basis earthquake(O BE), the shear behavior,flexure behavior,sliding stability and overturning stability can meet the design requirement. During the maximum design earthquake(M DE), al though the desanding basin shows good flexure behavior,the shear behavior can hardly meet the design re quirement. The cross section or the reinforcement of the structure should be adjusted. Moreover,the sliding instability and overturning instability could occur,and the nonlinear dynamic analysis is needed for the fur ther study.