Seismic Response Analysis Of Curve Beam Bridge Considering Soil-pile Interaction

In recent years, many bridges are built in our country along with the rapid development of traffic cause, many of which are curve beam bridge. But specifical seismic research for curve beam bridge is not so much. It lacks of systematic research on curve beam bridge about seismic response analysis. China is a country of many earthquakes. To researth the seismic response of curve beam bridge has certain practical significance to promote the application of curve beam bridge in bridge engineering. It takes a curve beam bridge as the research object, different finite element analysis is carried out and do research on seismic response of different design parameters.It first analyzes the change of dynamic characteristics after considering the soil-pile interaction. Because the stiffness decreases, the natural frequency of the structure is reduced. Then it analyzes the response spectrum of the structure including whether considering soil-pile interaction and different radius. It draws a conclusion that it can obtain maximum stress when inputting the seismic wave at the end of the bridge. So in order to control the stress of the structure, we should input the seismic wave along the end of the bridge in the design.It did elastoplastic time-history analysis of the curve beam bridge in the fourth chapter. It includes seismic response under different reinforcement ratio and different seismic wave. At the time of the same peak acceleration under different seismic waves, stress and strain diagram may vary considerably. It describes that the result of the seismic response is not only relevant with the numerical of the seismic waves but also with the spectrum characteristics. From the comparison of the ultimate development of plastic hinge state in the piers under two kinds of different seismic waves, it can be seen that the piers with different stiffness has different seismic response under different spectral characteristics earthquake waves. The displacement at the top of the pier is increasing while the stress is increasing or decreasing after considering soil-pile interaction under the two kinds of seismic waves, so it may have adversely affect on the structure considering soil-pile interaction. From the comparison of the ultimate development of plastic hinge state in the piers between the foundation consolidation model and the soil-pile interaction model, it can be seen that the development region of plastic hinge in both ends of the medial abutment pier in the soil-pile interaction model is bigger than that in the foundation consolidation model while the development region of plastic hinge is more or less under the two different models. So it may have adverse impact on the pier with smaller stiffness considering soil-pile interaction. As the reinforcement ratio increases, the trendency of stress cross the bridge piers has basic agreement while the trendency of stress in both ends of the medial abutment pier has basic agreement. This may related to different stiffness on different piers. So it is worth studying that the structure whether or not can achieve ideal seismic response in a suitable ratio of stiffness in different piers.In the end, it obtains failure modes and the development process of the piers at different moments and simulates the damage of the piers in the two different seismic waves whether considering soil-pile interaction. From that, some similarities and differences can be found out. Under Elcentro wave, the piers damage degree is reduced after considering soil-pile interaction, whereas under Tinajin wave, the piers damage degree is aggravated after considering soil-pile interaction. The piers damage more seriously in Tinajin wave than Elcentro wave in foundation consolidation model.