Fragility Analysis Presentation

Nov 29,20

We are pleased to announce that Dr. Zamiran will present a lecture in fragility and earthquake analysis of retaining walls at the 5th Annual Live Streaming Web Conference of Geo-Institute. In this investigation, the seismic response of retaining walls constructed with cohesive and cohesionless backfill materials was studied. Fully dynamic analysis based on the finite difference method was used to
evaluate the performance of retaining walls during different earthquake events. The analysis response was verified by the experimental study conducted on a retaining wall system with cohesive backfill material in the
literature. The effects of cohesion and free-field peak ground acceleration (PGA) on seismic earth thrust, the point of action of earth thrust, and maximum wall moment during the earthquake were compared with analytical and experimental solutions. The motion characteristics of the retaining wall during the earthquake were also considered. The relative displacement of the walls with various backfill cohesion, under different ground motions, and free-field PGAs were investigated. Current analytical and empirical correlations developed based on Newmark sliding block method for estimating retaining wall movement during earthquakes were compared with the numerical approach. Based on the developed model, fragility analyses were conducted to determine the probability of damage to the retaining walls during an earthquake event. Multiple earthquake ground motions were used to investigate the fragility response of the retaining walls. To evaluate the fragility of the studied model, a specific failure criterion was chosen for retaining walls. The failure criterion was selected based on different case histories of retaining wall failures and damages. It is demonstrated to what extent a small amount of cohesion in backfill material can influence the displacement of a retaining wall and the probability of damage in seismic conditions. According to the findings, practical correlations were presented for conducting the seismic design of retaining walls.

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