Research On Seismic Behavior Of Piers Considering Vertical Earthquake Force

Many earthquake disasters cannot be explained by the traditional standpoint that horizontal seismic controls structures’ damage. Domestic researches on vertical seismic are mainly for multistoried building and chimney. Just like chimney and frame column in multistoried buildings, pier belongs to slender structure, which is significant but flimsy under earthquake action. Therefore, research and analysis on seismic behavior of piers considering vertical earthquake force are necessary.Methods of seismic calculation and analysis for bridge are introduced. Multiple shear strength calculation formulas of pier are collected and compared in this paper. Through the comparison with experimental results, the conclusion can be obtained that the results calculated by Priestley formula, compared with other formulas, are more approximate to piers’ actual shear strength.Based on the finite element analysis software Midas Civil, single column pier models are established and calculated by nonlinear time-history calculation method. Pier sections of plastic hinge region are fiber divided. Displacement at the pier top and shear strength at the pier bottom in different axial compression ratios, slenderness ratios and seismic waves are studied in order to obtain the influences of piers’ seismic behavior considering vertical earthquake force in different axial compression ratios, slenderness ratios and seismic waves. The influences of piers’ seismic behavior in different forms of bridge structure by considering vertical earthquake force are studied through the establishment of three bridge models including simply supported beam bridge, continuous beam bridge and continuous rigid frame bridge.Some solutions are obtained through the comparison and analysis of piers’ seismic behavior before and after considering vertical earthquake force in different factors that the influences of piers’ seismic behavior by considering vertical earthquake force mainly lie in the reduction of shear strength and displacements at the pier top are little effected.