STUDY OF EFFECT PARAMETERS ON VERTICAL RELATIVE DISPLACEMENT BETWEEN BEAM AND PIER FOR SIMPLY SUPPORTED BEAM BRIDGE DURING EARTHQUAKE

Based on the finite element analysis software SAP2000, a finite element calculation model of two-span simply supported beam bridge was established and the time-history response analyses of relative displacement between beam and pier under the excitation of seven practical earthquake waves were carried out. Considering the parameters including the piers heights and span lengths as well as the bearing stiffness ratios of vertical compressive to tensile, different simulating methods of bearings are adopted for computing and some conclusions were acquired by comparing vertical relative displacement between pier and beam. The conclusions are that using bilinear line is more reasonable to express the vertical stiffness line of bearing, and with the increase of pier heights, span lengths and bearing stiffness ratios of vertical compressive to tensile, vertical relative displacements between piers and beams increase.