基于保险丝理念的桥梁蜂窝芯型挡块的抗震设计OA

To improve the insufficient seismic performance of bridge stoppers,a novel honeycomb-core seismic stopper was proposed based on the"fuse"principle and the in-plane energy dissipation con-cept of honeycomb structures.Firstly,the overall structural dimensions of the honeycomb-core seis-mic stopper were designed.After determining the overall dimensions,Midas/Civil finite element soft-ware was used to analyze the lateral force acting on the stopper under the E2 earthquake,and the di-mensions of honeycomb cells were further determined.ABAQUS finite element software was used for numerical simulation to select the optimal dimensions of the designed stopper that met the perfor-mance requirements of the"fuse"force-displacement curve.The full-bridge model was established us-ing OpenSees finite element software,and the performance of the honeycomb-core seismic stopper in restricting main beam displacement and transmitting inertial force to the substructure was analyzed based on the seismic response of the substructure.The results showed that with the increase of honey-comb cell thickness,the strength change of the honeycomb-core seismic stopper at failure could be di-vided into three stages:elasticity,strength increasing,and strength decreasing.Practical analysis showed that the honeycomb-core seismic stopper exhibited good ductility and could provide an excel-lent displacement limiting capacity within a certain deformation range.Under small and moderate earthquakes,the stopper remained in the elastic or strength development stage,and its influence on the substructure increased with the increase of the peak ground acceleration.However,under strong earthquakes,the stopper transitioned into the strength decreasing stage.In conclusion,with the in-crease of honeycomb cell thickness,the strength of the new stopper shows a trend of being elastic first,then increasing,and finally decreasing,with strong energy dissipation capacity.Analysis of actu-al piers shows that the stopper stays in the elasticity or increasing stage under small and moderate earthquakes and enters the strength decreasing stage under strong earthquakes,realizing the structural"fuse"function.The ductile sliding failure of the new stopper causes no damage to the substructure and facilitates post-earthquake repair.