Static performance analysis of prestressed Π-type beam cable-stayed bridge cable damage

Anotace: With the increasing span of cable-stayed bridges, the self-weight of the structure accounts for a large proportion. The π-type beam, due to its small cross-sectional area, can significantly reduce the self-weight and cost. It is suitable for double-cable surface system cable-stayed bridges and has therefore experienced rapid development. This paper takes a prestressed π-type beam cable-stayed bridge in China as an engineering example, and focuses on the overall and local parameter sensitivity of the structure, as well as the force characteristics under cable damage. The main factors causing cable damage in prestressed π-type beam cable-stayed bridges are analyzed, and the selection of elastic modulus as the damage variable is determined. Based on the finite element model analysis of the actual bridge, different cable damage simulations are selected to analyze the static variations of the main beam and cables caused by single-side, symmetrical, and asymmetrical cable damage, as well as the dynamic variations of the overall bridge. This analysis provides a reference for the mechanical performance analysis of prestressed π-type beam cable-stayed bridges under similar cable damage conditions in the future.