The Experimental Research Of Shaking Table On Earthquake Simulation Of Wanzhou Yangtze River Bridge

Wanzhou Yangtze River Bridge of Yiwan railway is important transportation infrastructure spanning across the river with the character of high pier, large span and heavy movable load, especially its hollow bridge pier, so it is necessary for earthquake-resistance analysis of this whole bridge to make an experimental research besides theoretical analysis.According to dynamic similarity theory an experimental model with 1:100 ratios is made out of raw material of ABS plastic in this paper For the train movable load on the surface of bridge, full load of train is considered as the only load behavior. To make a research of the vertical and horizontal vibration character of this bridge, a simulation seismic table experiment of the bridge model under vertical and horizontal seismic motivation has been carried out and Some important experimental results have been gained by the measurement including the dynamic character of the whole bridge and dynamic response of acceleration and strain of bridge piers, surface and truss arches.Due to the limitation of model bearing capacity and frequency range of the simulation seismic table, seismic table experiment couldn't completely base on similarity theory. With this consideration, by adopting the large finite analysis software set up the theoretical calculation model, make the analysis of dynamic character, and make the dynamic response analysis by choosing the actually measured acceleration data of steel trusses on the bottom of bridge as the input seismic load. With the comparison of FEA data and actually measured data of the seismic desk simulation experiment, the validity of calculation model of this bridge and dynamic analysis has been validated. Basing on this analysis, certain modifications have been made with the calculation model and actually measured acceleration data and ultimately the dynamic character and response meeting the regular similarity theory has been gained in this paper.According to the similarity relationship, dynamic response of the real bridge structure is got under the action of given general and unusual simulation seismic excitations. Under the vertical and horizontal action of given general and unusualsimulation seismic excitations, some items have been checked including the elastic displacement of top surfaces of concrete piers and whole vertical stability according to the related code, section intension of crossing part of upside of hollow part and downside of solid part. The checking results indicate that all the items all satisfy the requirements of regulation.Taking the little-ration and less-mass model as research object in this paper, safety and credibility of structural design of Wanzhou Yangtze River Bridge Yiwan railway has been validated by the seismic experiment.