| "Bridge is the general principle of the road." The safety of bridge is an important guarantee for the open road. Since the beginning of the21st century, with the frequent crustal movement and earthquake disasters, the anti-seismic projects rely on the anti-seismic performance of the bridges, to which people and government pay much more attention. Therefore, the bridge engineers focus on how to improve the seismic performance of Bridges in the design process in order to ensure the safety of the structure. Among many theoretical analysis and research, the basic boundary conditions and attenuation characteristics of bridge structure is one of the difficulties. So the research analysis and the beneficial conclusion can provide the basis for designing anti-seismic bridges which has important practical significance.The thesis elaborates the basic theory of the structure seismic response and analyzes respectively the earthquake response spectrum under different basic boundary conditions and different attenuation characteristics of ground motion schedule of Tuyang highway overpass across Bohai Sea Road, and the main contents are as follows:1) Based on the MIDAS Civil Software, the finite element model of the bridge structure space is established and analyze Vibration model.2) Analyze the earthquake response spectrum under three different boundary conditions and make the comparison of the result in order to sum up the basic boundary condition to the response of the earthquake.3) Analyze the seismic time history response under three different attenuation characteristic conditions and make a comparison of the results in order to sum up the influences under the attenuation characteristics of seismic response time history analysis.4) Analyze the result of the above summary and get reasonable conclusion and provide foundation for bridge anti-seismic analysis for future study. |
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