Seismic Risk Assessment of a Novel Bridge-Aqueduct Cobuilt Structure

Abstract

A seismic risk assessment is a guarantee to keep the integrity of the infrastructure under an uncertain earthquake action. This paper carried out seismic risk assessment of a novel bridge-aqueduct cobuilt structure (BACS) under uncertain parameters, and the vulnerability was evaluated by the fragility of the pier and waterproof plate. The drift rate of the pier and the crack width ratio of the waterproof plate were defined as the damage index of the fragility curves. A back propagation (BP) neural network model was constructed, and the fragility data of the two simulated components were grouped into training and testing. The average deviation of the two models was within 5%, which can provide a methodology for BACS seismic risk assessment under other conditions.