Dynamic Response of Cable-Stayed Bridge Under Seismic Vulnerability Analysis: State of the Art

This research paper addresses significant gaps in the existing literature on cable-stayed bridges, focusing on the design and analysis of super-high cable-stayed bridges in higher elevation areas. While previous studies have primarily concentrated on super-span cable-stayed bridges under mild to moderate seismic conditions, this work delves into the dynamic response of super-high cable-stayed bridges, particularly in remote locations. Constructing cable-stayed bridges in higher elevation areas presents unique challenges, necessitating a comprehensive seismic analysis and fragility analysis to optimize seismic forces and assess the vulnerability of these structures. To overcome these challenges, the implementation of a damping system is crucial. This study proposes the integration of a damping system to enhance the seismic response of super-high steel cable-stayed bridges, reducing their vulnerability and enhancing their overall safety and stability. Moreover, the joint actions of various loads, such as stochastic traffic and wind, on cable-stayed bridges require comprehensive analysis. While previous research has considered traffic and wind load individually, there is a need to explore their combined effects, particularly as daily traffic volume increases. This study aims to investigate the cumulative fatigue loss and stress ranges under different load combinations to gain a better understanding of the bridge's behavior. Additionally, the durability, stability, and overall structural behavior of cable-stayed bridges after implementing structural modifications need to be comprehensively assessed. Previous research has proposed modifications to mitigate specific issues; however, the long-term effects and performance benefits of these modifications remain unexplored. Therefore, further investigation is necessary to evaluate the effectiveness of these modifications and ensure the structural integrity of the bridge systems. By addressing these gaps, this paper aims to contribute to the design and analysis of super-high cable-stayed bridges, enabling safer and more efficient transportation to remote higher elevation areas.