Seismic Safety Evaluation for Concrete Gravity Dams

Abstract eng:
The design of aseismic reinforcement and the seismic safety evaluation for Jinanqiao roller compacted concrete (RCC) gravity dam are discussed in the paper. The results indicate that it is not suitable to determine the amount of reinforcement by the elastic stress at key locations of dam. For the design of the steel reinforcement it is required that the crack does not damage the grout curtain in the dam heel, and cracks at the corners do not have any effect on the stability of the dam. The stress that located near stress concentration is chosen to determine the initial amount of reinforcement, and the final reinforcement is determined by the results of nonlinear finite element analysis of the dam. The separated reinforced concrete nonlinear finite element model is used to analysis the earthquake response of the dam. The strain rate, damage variable and stiffness degradation are included in the concrete elastic-plastic damage model. The ideal elastic-plastic constitutive relationship is adopted in the analysis. Aiming at the possible slip modes of the powerhouse dam section and the dam damage after considering the nonlinear earthquake response, aseismic stability evaluations of the dam are analyzed. The results show that the aseismic stability of the powerhouse dam section of Jinanqiao gravity dam meets the requirements of China Code. The reinforcement scheme provides basis for the design institute to determine the final reinforcement scheme.

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