Reliability Analysis of a Cable-Stayed Bridge: A Comparative Study Across Varied Support Scenarios and Incorporating Soil-Pile-Structure Interaction

In this paper, the reliability of a cable-stayed bridge with a span of 640m is investigated and compared in three different scenarios. While both the first and second scenarios assumed a fixed end for the bridge supports used, they differed in terms of material and geometric behavior. Finally, the third scenario differed from the second by incorporating a soil-pile-structure interaction (SPSI) to account for the flexibility of the underlying support. This study accounts for uncertainties in the structure, pile, and soil parameters. The Latin hypercube sampling (LHS) method and dynamic time history analysis were used to estimate the structural responses. Artificial earthquake records at four different risk levels are used for the dynamic time history analysis. Using the machine learning method, several additional results were generated and used in the seismic reliability evaluation. In the case where the SPSI was a simulation, the reliability analysis showed a higher probability of cable failure than other criteria. The element of the tower in the fixed support case also has a high probability of failure. The results of the reliability analysis of the nonlinear models showed a higher probability of failure for a cable-stayed bridge on flexible support than on fixed support.