Reliability Analysis of Arch Dam Subjected to Seismic Loads

Arch dam has complicated structure, and its dynamic reliability under seismic loads has drawn much attention in practice. The objective of this paper was to compute the dynamic effects of the Dayang arch dam under seismic loads. The dynamic effects were calculated by the modal superposition response spectrum method. The corresponding stress and displacement responses were realized by finite element methods with the effects of temperature changes on arch dam considered. In the analysis, the elastic modulus, the tensile strength and the compressive strength of the dam body (concrete) and foundation (rock) are all seen as random variables. Quadratic response surface method is applied to build the limit state function of the structure. The reliability index of each element of the dam is calculated by gradient optimization method, and the evolution rules of reliability index of the Dayang arch dam are obtained. The results show that the tensile reliability index is low in the dam heel and parts of the neighborhoods of dam abutment where the aseismic measures should be designed. In the other areas, the tensile index and compressive index can satisfy the reliability requirements. The method in this paper can apply directly the computing program for deterministic structures so that the reliability analysis is easy and convenient to realize. It provides a potential pathway for the reliability analysis of large and complex structures.

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