ABSTRACT
Based on an actual bridge project, three suspension bridge models with different kinds of central buckle were established on Finite Element Analysis model. The influence rule of central buckles on the long-span suspension bridge’s dynamic and seismic performance was conducted by modal analysis and dynamic time history analysis. In terms of bridge’s dynamic performance, it is found that the central buckle increases the overall stiffness of suspension bridge, impacts on the antisymmetric vibration mode significantly, and restrains longitudinal floating modes effectively. Besides, the rigid central buckle can make main cable’s vibration modes in advanced. In the aspects of bridge’s longitudinal seismic performance, the central buckles reduce the main girder longitudinal displacement and increase both main girder and main cable in the middle of span’s internal force with these effects of the rigid central buckle increasing. The results also show that the central buckles make little influence on the displacement and internal force of bridge’s other section. In the transverse direction, only the set of rigid central buckle increases the main girder’s mid-span shear force, and doesn’t influence on the displacement and internal force of the other parts. The research can provide some useful suggestions and references for the similar long-span suspension bridge structures’ design.
