Study on Seismic Behavior of Single Tower Cable-Stayed Bridge with Overload Yield Bearing in High-Intensity Regions

Abstract

In order to study the seismic isolation bearing problem of the single tower cable-stayed bridge under earthquake action, the seismic performance of the bridge is improved at the conceptual design stage. For the overload yield bearing, a single tower cable-stayed bridge in the high intensity area is taken as the research object. The full-bridge three-dimensional finite element model was established by SAP2000 spatial structure analysis and design program. The pile-soil interaction was considered, the vertical joint of the pylon was simulated, and the structural natural vibration characteristics, response spectrum and nonlinear seismic response time history analysis were carried out. meanwhile, the influence of the shear of bearing on the natural vibration period and seismic response of single-tower cable-stayed bridge is also studied in this paper. The results show that under the nonlinear time history analysis, the bearing will be sheared under the E1 probability. After the shear, the structural period is prolonged, the seismic response of the auxiliary pier and the side pier is greatly improved and the plastic hinge can be avoided. Under the E1 probability and the E2 probability, considering the shear of the bearing, the seismic response of each main component of the structure is smaller than the ultimate bending moment of the section, and the damping effect is good. The research results show that the overload yield bearing has a high promotion value and can provide reference for the seismic design of the same type of bridge.