Review-Seismic Analysis of Cable Stayed Bridge Under Moving Loads Using IRC & AASTHO Methods with Different Shapes of Pylons

Abstract

Cable-stayed bridges represent a pinnacle of modern structural engineering, combining aesthetics with functionality across long spans. However, their seismic performance, especially under the simultaneous action of dynamic loads such as vehicular movement and earthquakes, remains a critical area of study. This review explores the seismic analysis of cable-stayed bridges subjected to moving loads using two major design standards: the Indian Road Congress (IRC) and the American Association of State Highway and Transportation Officials (AASHTO) methods. Emphasis is placed on evaluating the influence of varying pylon shapes—A-shaped, Hshaped, inverted-Y, and others—on the dynamic response of the bridge system. The paper presents a comparative understanding of both design codes, analysis techniques, seismic provisions, and their implications on structural behavior, safety, and performance. Through detailed evaluation of recent research and simulation-based findings, this study aims to inform future design practices and highlights key areas for further investigation, including nonlinear dynamic analysis, soil-structure interaction (SSI), and pylon geometry optimization.