The main modes analysis of continuous curved box-girder bridge

According the bridge，132 meters long tapered ，continuous curved box-girder bridge as the research object.Divide the continuous beam bridge models into vertical bending, pure torsion, lateral bending and longitudinal movement of the four sub-direction.Each energy of the vibration mode also divided into vertical bending energy, torsion energy, energy and transverse bending along the longitudinal direction of the translational energy of four energy.Introduce four directions coefficient to represent the energy of each sub-share each vibration direction, respectively the ratio type of energy, and to judge the main modes tapered continuous curved boxgirder bridge.