ABSTRACT
For the seismic design of large-span cable-stayed bridges built in high-intensity areas, it is necessary to consider the balance between internal force control and displacement control. The half-floating system is widely used in the longitudinal direction of cable-stayed bridges, which utilizes the displacement of the main beam for energy dissipation, but may result in significant relative displacement between the main beam, tower, and pier. In order to meet the needs of wind resistance, rigid constraints are often used in the transverse direction of the bridge to ensure the serviceability state, but it also leads to significant internal force response of the substructure under earthquake exaction. Therefore, it is necessary to design a reasonable damping system for large-span cable-stayed bridges to ensure the safety of the structure. This article conducts seismic calculations and seismic design for a half-floating cable-stayed bridge in a high intensity area. Hydraulic viscous dampers are used in the longitudinal direction to control the displacement of the main beam, and steel dampers are used in the transverse direction to provide energy dissipation. In this paper, the reasonable design parameters of the damping device are obtained through analysis, enabling the structure to achieve better seismic performance.
