Longitudinal damping parameter sensitivity analysis of self-anchored suspension bridge with viscous dampers

Feng miao, Ping tian, Ping guan

In order to study the influence of various parameters on the dynamic response of the self-anchored suspension bridge with viscous dampers, based on a self-anchored suspension bridge, a model was establish by Midas/Civil finite element software, and the longitudinal seismic response of the bridge under the position change(placement between the main girder and the side pier, the main girder and the main tower ,and placement between the main girder and side piers and the main beam and the main tower at the same time) of the viscous damper is analyzed by nonlinear time history analysis method. Point at the seismic response of beam end displacement, tower top displacement and tower bottom bending moment, considering damping scheme, viscous damper velocity index α and viscous damper damping coefficient C, the orthogonal test was carried out according to the levels of each factor selected. The results of orthogonal test showed that the damping coefficient C has the most significant effect on beam end displacement, tower top displacement and tower bottom bending moment; damping scheme has a great influence on tower top displacement and tower bottom bending moment, but the influence on the beam end displacement is not sensitive; Velocity index α has a great influence on beam end displacement, but the influence on the tower top displacement and tower bottom bending moment are not sensitive.