The feasibility of utilizing elastoplastic cable pair and viscous damper on seismic isolation of long span cable-stayed bridges is to be evaluated. Nonlinear constitutive model for elastoplastic cable pair was developed based on Caltrans. Through linearly increasing excitation intensity, the responses of the Yongning Yellow River Bridge were analyzed, in which elastic cable pair and viscous damper had been successfully applied in lateral seismic control, and the cable pairs were forced going into inelastic phase. The results show that deformation capacity of cable pairs can be greatly enhanced if certain plastic behavior is allowed and consequently the ability for the structure against strong earthquakes can be significantly improved. In comparison with the conventional system with fixed transverse girder-tower connections, the utilization of elastoplastic cable pair and viscous damper can substantially reduce the seismic responses such as base bending moment on pylon and acceleration of girder. When compared with the hypothetic case with ideal elastic cable pair, though residual displacement of the girder is relatively larger, the maximum transmitted force of the cables and the acceleration of the girder can be well controlled, while the relative displacement at the tower and pier locations and the base bending moment on tower columns are quite similar.
游瀚,管仲国. 弹塑性索和粘滞阻尼器系统用于斜拉桥横向减震分析[J]. 振动与冲击, 2017, 36(14): 183-188.
YOU Han, GUAN Zhongguo. Utilization of elastoplastic cable pair and viscous damper on lateral seismic isolation of cable-stayed bridge. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(14): 183-188.
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