Study Of The Multi-span Continuous Isolation Ramp Bridge And Vibration Table Earthquake Simulation Test

Bridge as an important transportation hub project was called "lifeline engineering".Today, the rapid development of the national economy along with the construction needs of avariety of large bridge projects, once an important bridge destroyed in the earthquake disaster,not only the huge economic losses, more seriously affect the relief and reconstruction work.Therefore, the traditional seismic design for some important strategic significance of largebridges no longer applicable, rational use of damping, isolation technology is an effective wayto solve such problems.Internationally, it has been very mature that the damping and isolation technology use incontinuous beam bridge.There are a number of this form of isolated bridge having built orunder building in China, yet. Most have been built multi-span continuous girder bridge inisolation, a small angle with the horizontal deck adjacent pier height which can be regarded asa "levels bridge", while the deck and the horizontal angle is large, relative elevation pierslarge "slope bridge" relatively small. Taking a coastal bridge project as an example, twofeatures associated continuous bridge part of the bridge project appears that little pier height"levels bridge" pier height associated with larger "slope bridge" linking the use of lead beisolated rubber bearing core design. In this paper, the two bridges time history analysis, andfeatures a large pier height associated seismic shaking table test, the main contents are:1. Using software midas Civil building three dimensional space finite element calculationmodel,making the ramp bridge isolation design and dynamic time history analysis.2.Comparing the isolation and the unisolation cases of internal force, accelerationresponse, analysis of the isolation bearing displacement and energy consumption.Compare theinternal force response of the isolation slope bridge with the isolation level bridge3.Changing the elevation difference between the "slope bridge" adjacent piers and theparameters of the isolation bearings, under severe earthquake dynamic time history analysis,seeking the scheme of optimizing isolation effect.4.Taking earthquake simulation shaking table test of ramp bridge and study the dynamic response characteristics, and numerical simulation prove the validity of the test.