Analysis Of Seismic Response Including Pounding Effect And Shock Attenuation Measure For Reinforced Concrete Bridge

Under strong ground motion excitations, the simple supported bridges will pound between two adjacent decks. This collision behavior will cause very heavy influence on the structure of the bridge. In this paper, the characteristics of the pounding response of the simple-supported bridges under earthquakes are studied. Based on the comprehensive reading and understanding of related literatures on pounding and falling-off prevention measures, the state of the art of the analytical method of seismic responses for continuous girder bridges, the theoretical and experimental studies on pounding effects between adjacent bridge decks subjected to longitudinal earthquake, mitigating pounding effects and falling-off prevention measures and hinge restrainers were reviewed and summarized. A three dimension's model is made. On the basis of the model, a nonlinear finite element program is written, and the analysis about pounding force making pulse on structural and it's displacement are made by this program. A lot of actual earthquake waves are selected to take the factors that affected the bridge pounding response into consideration such as earthquake waves, the gap size, the soil condition, the pier height and cross-sectional stiffness, one or two side(s) seismic response pounding, bearing feature. The results indicate that the seismic responses of bridge are greatly changed by pounding to some extent. The pounding response of bridges is influenced by different earthquake excitation, gap and the soil condition. With the increasing of fraction coefficient of Teflon sliding bearings, the bend moments and shear force sat the bottom pier and the pounding force of the adjacent super structures will be decreased to different extent. It is not always right that pounding force can be decreased with prolonging structural period by increasing rubber bearing's stiffness.