Abstract
The article is devoted to the study of cable-stayed structures in bridges and analyzing the causes of their collapse. Cable-stayed bridges, due to their elegant shape and high strength, are widely used in modern construction, but their collapse is a serious problem for the engineering community. This paper discusses the main design features of cable-stayed bridges, their advantages and disadvantages, and the factors contributing to their collapse. The analysis of the causes of the collapse of the arch span of the Nanfanaon Strait Road Bridge in Suao City, Yilan County, Taiwan includes a study of historical collapse cases, which reveals common patterns and causes such as design errors, inadequate maintenance, natural factors, and human factors. Cases where structural defects caused by material fatigue or improper operation lead to catastrophic consequences are also considered.The paper presents a methodology for condition assessment of cable-stayed structures, including the use of modern technologies such as unmanned aerial vehicles (UAVs) and real-time monitoring systems. Special attention is given to recommendations for improving the design and operation of cable-stayed bridges, which can significantly reduce the risk of collapse.Thus, this study not only emphasizes the importance of understanding the causes of collapses, but also offers practical solutions to improve the safety of cable-stayed structures, which is critical for the future of bridge engineering, and is also important for improving the reliability of cable-stayed bridge structures in the future. In order to prevent dangerous situations in advance, it is necessary to conduct inspections and tests of bridge structure elements in accordance with the plan, using specialized equipment and instruments, as well as to install monitoring systems.