Abstract：Transves collisions between restrain block and main girder under earthquake excition are the important factors that affect the seismic response of the bridge. Recent researches lack of dicussion on the lateral collision problems related to the Double-Column and Box-Girder Bridge(DCBGB) which is widely used in urban viaduct. Taking a bridge as an example, this paper established the spatial finite element model, the lateral collision is accurately simulated through the Kelvin-model. Then the key factors that affect the seismic responses of the DCBGB, such as the impact stiffness, the restrain block - main girder gap, height of bridge pier, site category, quality ratio of the upper structure to cap beam.The research shows that: the impact stiffness and impact clearance have greater influence on the internal forces of the double column pier bottom. The factor should be confirmed by testes as far as possible. The design parameters such as site features, quality ratio of the super structure to cap beam and pier height also have great influence on the bridge seismic force, therefore design parameters should be carefully adjusted when the bridge were designed. Choosing hard site, higher piers and lightweight main girder structure system will be a good choice. In all, this research conclusion can provide technical support for the design of similar viaducts bridges.
2014, Vol. 33 
