Seismic Response Analysis And Vibration Reducing Measures Of The Continuous Girder Bridge With High Bridge Piers

Earthquake is one of the most destructive natural disasters that perplex humanity. Particularly on May 12th 2008, China Wenchuan Earthquake causes huge casualties and property losses, It is the most destructive,the most widely spread earthquake ,the most difficult of an earthquake disaster relief since the founding of New China. Earthquake can destruct various lifeline engineering structures such as building, roads, bridges, tunnels directly. Most of the bridge collapse is due to the strong earthquake ground motion, or on the ground of permanent deformation caused by the earthquake. As well as there are also some bridges are due to the landslide and washed away by the earth and rock. This is the direct result of the interruption of transport and has seriously affected the rescue and relief work; also it indirectly brings greater disaster to human society. In this paper, high-pier Continuous Rigid Frame Bridge Seismic Analysis of Research, using large-scale structural analysis program MIDAS / CIVIL seismic waves, and by using response spectrum analysis and time-history analysis method to a practical high-span continuous rigid frame bridge in the seismic response analysis, time history analysis, response spectrum method are summarized and compared in their advantages and disadvantages. This is also the bridge seismic response of traveling wave effect was time-history analysis of the numerical simulation of the high-span continuous bridge along the bridge to the seismic waves of different phase of the traveling wave effect and wave effects of high and low on the bridge Pier differential impact. The result shows:Traveling wave has a great effect on the high-pier-span continuous girder bridge. The greater the differences between high-span and low-span, the more obvious the traveling wave effect.During the aseismatic design of the high-pier-span continuous girder bridge, traveling wave effect should be taken into account. So the traveling wave effect cann't be ignored in the process of the aseismatic design and the calculation of the high-pier-span continuous girder bridge. According to the trait of high-pier-span continuous girder bridge, the text certained the plan of the lead rubber bearing device.By comparing the seismic response of the bridge with and without the device, we can get the analysis of the aseismic effect which produced by the lead rubber bearing device due to the high-pier-span continuous girder bridge. And all these can provide a referrence to the vibration reducing of the high-pier-span continuous girder bridge. The result shows: By adopting the the lead rubber bearing device, regarded as the vibration reducing device, the reaction of the response of structures subjected to earthquakes has declined to a great extent, and the force distribution has become evener, which helps the load-carrying capability of the structure.