Multi-modal Seismic Control of Suspender Cables Based on Hybrid Countermeasure of Damper and Spacer
Suspender cables are crucial force-transmitting components in suspension bridges,with characteristic of high length-to-diameter ratio,low mass,and low damping,which make the suspender cables prone experience significant vibrations under external dynamic loads.Currently,a hybrid seismic countermeasure that consists of ca-ble-end dampers and rigid spacers has been proven to be effective in suppressing the vibrations of suspender cables.However,the existing researches mainly focus on controlling the low-order or the single-mode vibration of the sus-pender cables.In some cases,suspender cables may experience high-order as well as multi-modal vibrations,which exceeds the scope of existing researches.Therefore,the multi-modal seismic control of suspender cables by a hybrid cable-end damper and a spacer is further investigated in this study.Firstly,based on the finite difference method,the motion equations of the double-cable system with the hybrid control measure are established and the accuracy is validated to obtain the dynamic characteristics.Then,the optimization objective is proposed,and the spacer and the damper parameters are optimal designed.The results indicate that the multi-modal damping effect provided by the damper is significantly influenced by the stiffness and position of the spacer.When the spacer is in-stalled away from the damper,the damper can achieve a better multi-modal seismic control efficiency.Compared with the odd-order modes,the influence of spacer parameters on the damping effect for the even-order modes are more obvious.
suspender cablespacerdamperhybrid countermeasuremulti-modal seismic control
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