STUDY ON THE DYNAMIC CHARACTERISTICS OF DAMAGE PROBABILITY OF GRAVITY DAM

Abstract

Probabilistic analysis is very significant in concrete gravity dam. In particular, the damage characteristics of concrete can result in nonlinear response of concrete gravity dams and in consequence probabilistic analysis for the damage of those is difficult. The proposed solution is essentially a first-order approximate probabilistic analytical approach for the damage of concrete gravity dams, based on pseudo-excitation method. The proposed method involves the following contents. Firstly, pseudo excitation method and Mazar damage model were utilized to analyze how to calculate the expected value and variance of the damage of dam, which was excited by random earthquake load and static load in the initial condition. Then the evolutive process of probability distribution of tension damage of dam was analyzed in the damage condition based on perturbation theory. Finally, a numerical example was given to verify and analyze the convergence and stability of this model. The results indicate that, compared to pseudo excitation method, the proposed method has the salient features of probabilistic analysis for nonlinear response of concrete gravity dam.