To investigate the optimal longitudinal seismic energy dissipation system of straddle-type monorail-cum-road long-span cablestayed\nbridges, the Niutianyang Bridge was selected as the engineering background, and the explicit time-domain dimensionreduced\niteration method was adopted to carry out nonlinear time-history analysis. To consider the dynamic characteristics of\nlongitudinal movable supports, the static and dynamic responses of four kinds of energy dissipation systems were studied,\nincluding longitudinal unconstrained, elastic cable, viscous damper, and speed lock-up devices.The damping effect of four types of\nschemes in which viscous dampers were installed at piers or towers was analysed, and the parameters of the viscous dampers were\noptimised. The influences of the straddle-type monorail train braking force and the running vibration of the straddle-type\nmonorail traffic on the parameters of the viscous dampers were analysed. This study shows that the viscous damper system had the\nlowest bending moment at the bottom of the tower and a smaller displacement response, and the energy dissipation was the best.\nEach viscous damper had the highest energy dissipation efficiency when they are installed only at the main tower����..
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