Seismic Reliability Cable-Stayed Bridge with Latin Hypercube Sampling Methods

Cable bridges are one of the essential structures that are sensitive to vibrations. Therefore, it is necessary to investigate the seismic behavior of them. The uncertainty in structural members and earthquake excitation should be considered due to the undetectability and indeterminably them. In this paper, the reliability of the cable-stayed bridge with a 640-meter length span in two states with linear and nonlinear behavior for materials is investigated. The uncertainty in member parameters of pylons, girders, and cables, which includes the elasticity modules, cross-section, material yield strength, is considered, and the efficiency of each one is simulated by the sampling method. Linear and nonlinear time history dynamic analyses are performed by artificial earthquakes produced at four different seismic hazard levels. The sensitivity analysis shows that the cable parameters have the highest sensitivity. The reliability analysis also indicates that the failure probability in the pylon is more than cable, and the failure probability in the nonlinear model is higher than the linear model.