Study on Stochastic Seismic Response and Dynamic Reliability Considering Uncertain Structural Parameters of Non-linear Earth-Retaining Wall

摘要

A simple numerical deterministic approach for evaluating stochastic properties and reliabilities of structural systems with uncertain parameters under random seismic excitations ("double-random problem") is presented. The method is based on the impulse response function method, the perturbation law and random central differential law. On the other hand, the equivalent linear model is used to account for the nonlinearity of soil. On the basis of the proposed method, the random seismic response and dynamic reliability of earth-retainm" g wall are all analyzed. We can see that considering the nonlinearity of foundation and backfill soil material, the mean square roots response of horizontal displacement has larger increase. The maximum value response including the displacement, moment and resultant force will increase with the heighten of reliability index, and the aseismic design by linear model will result risk than non-linear model. The simulation analysis verifies that the proposed method is applicable to the reliability analysis of uncertain nonlinear structural system under the random seismic excitations, which provides a practical way for analyzing the dynamic reliability of other geotochnical engineering structures.