ABSTRACT
In order to study the mechanical performance of a single-tower cable-stayed bridge under different restraint systems and determine the reasonable restraint system, the Dongjiang Bridge, a single-tower cable-stayed bridge with a span of (268 + 213 + 85) m, is taken as the research object, and the influence of different restraint systems on the seismic response of the structure is studied based on the nonlinear time history analysis method. The results show that the damping system can reduce the internal force of the tower under earthquake, but the damper does not play a role under static action, which will lead to a larger expansion joint scale. Although the internal force at the bottom of the tower increases, it can still meet the requirements of seismic performance, and the displacement at the end of the beam is relatively small under static and dynamic actions, so it is recommended to adopt the tower-beam restraint system. The use of graded bearings can improve the performance of piers under transverse earthquakes and enhance the seismic performance of cable-stayed bridges. In the seismic design of similar bridges, it is suggested to use graded bearings to meet the design requirements under static and dynamic loads at the same time.
