Seismic Response Analysis Of Continuous Beam Bridge With Large Spans And Vibration Isolation

In recent years, earthquake disaster frequently occurred all over the world. And bridges are lifeline engineering, once destroyed, it will bring great damage to the lives and properties of people. Because continuous beam bridge is one of the most extensive bridges, it is necessary to take study and analysis. In this thesis, take a long span bridge as an example, Conducted seismic response spectrum analysis, time history analysis and isolation analysis of earthquake are applied to a continuous beam bridge of one unit with 12 spans. The main contents include the following:1. By established three-dimensional space finite element model to calculate the free-vibration characteristic of the bridge.2. Using response spectrum analysis methods was no pile-soil-structure interaction and pile-soil-structure interaction in seismic response analysis.3. Using time history analysis method were carried out without pile-soil-structure interaction and pile-soil-structure interaction in seismic response analysis.4. The seismic response of isolation has been discussed in this paper, including the internal force and displacement.Through the above analysis, main conclusions include:Firstly, under earthquake action, the braking pier of continuous beam bridge responds fiercely to the vertical seismic force and displacement, while there is less influence on the non-braking pier. Secondly, under the influence of horizontal earthquake action, what the continuous beam bridge pier displacement most is the horizontal displacement, and vertical displacement is relatively less. Thirdly, the continuous beam bridge, with interaction of the earth-pile-structure, obtains longer period of structural vibration, as well as more horizontal displacement under the earthquake. Finally, it is more appropriate to reallocate the bottom shearing force and bending moment along the continuous beam bridge after the utilization of lead rubber bearing.