Transverse Seismic Performance Analysis Of Highway Bridge With Double Column Piers

Under the action of horizontal seismic load,the dynamic axial force of double column pier will change with the horizontal seismic force.In this paper,the influence of the horizontal force on the displacement of the dynamic axis is analyzed from the level of the dynamic axis.(1)In order to study the stress and deformation characteristics of double column pier under static action,taking the transverse frame system of double column pier as the research object,the force method is used to analyze the stress and deformation characteristics under transverse unit force.Taking a typical Urban Viaduct with double column piers(4×31m)as the engineering background,the influence of geometric parameters such as the height of double column piers,the spacing of double column piers and the moment of inertia ratio of pier beam section on the stress and deformation of double column piers under the transverse static action of the bridge is studied.(2)A typical double column pier urban viaduct is selected as the object to analyze the transverse dynamic characteristics of the bridge and the transverse seismic internal force under E1 earthquake.By changing the height of the double column pier,the spacing of the double column pier and the moment of inertia ratio of the pier beam section,the influence of geometric parameters on the transverse dynamic characteristics of the bridge pier and the transverse seismic internal force is explored.(3)Based on the elastic-plastic seismic response analysis of Urban Viaduct with double column piers under the cross bridge input of E2 earthquake,the influence of geometric parameters on the bending strength judgment of control section and lateral displacement demand of piers is explored by changing the height of double column piers,the spacing between double column piers and the moment of inertia ratio of pier beam section.(4)Based on the nonlinear beam column element with concentrated plastic hinge,the finite element model of single pier with double column pier is established and pushover analysis(static elastoplastic analysis)is carried out.By changing the height,spacing and moment of inertia ratio of pier beam section of double column pier,the influence of geometric parameters on displacement capacity,displacement ductility coefficient and shear capacity of pier top is explored.