Abstract
In order to mitigate the excessive longitudinal displacement responses of suspension bridge girders induced by vehicle braking force, as one of the possible dynamic loadings, a combined control strategy consisting of viscous dampers and friction pendulum bearings is developed in this paper. Firstly, the vehicle composition and the braking force models of the Pingsheng Bridge are obtained by traffic survey and testing results, respectively. Then, the vibration response analysis for the bridge under the braking force is implemented using the MIDAS finite element model. Furthermore, viscous dampers and friction pendulum bearings are separately employed to reduce the vibration responses. The influence matrix method is first used to determine the optimal parameters of viscous dampers. Finally, the effect of the combined control strategy for the vibration control is investigated. The numerical analysis results indicate that utilizing the influence matrix method for the parameter optimization of viscous dampers is feasible and effective. It is also shown that the longitudinal displacement response of the Pingsheng Bridge subjected to the vehicle braking force can be effectively mitigated by viscous dampers, friction pendulum bearings or the combined control with the optimized parameters, and the combined control outperforms the viscous dampers or the friction pendulum bearings alone.
Highlights
Suspension bridges are widely employed in long-span bridges since their internal force can be controlled well owing to the good energy-dissipating performance decided by its long period of the first-order longitudinal floating mode
The present study aims at developing a combined control strategy for vibration mitigations of a suspension bridge induced by vehicle braking forces
The combined control strategy consisting of both viscous dampers and Friction pendulum bearings (FPBs) is developed to reduce the vibration responses in which the influence matrix method is first applied for the parameter optimization of viscous dampers, and the effectiveness of vibration mitigations is verified by numerical analysis
Summary
Suspension bridges are widely employed in long-span bridges since their internal force can be controlled well owing to the good energy-dissipating performance decided by its long period of the first-order longitudinal floating mode. The excessive longitudinal displacements cause many problems such as bridge bearing damage, destruction of expansion joints, fatigue fracture of short hanger cables, pounding between the girders and adjacent approach bridges and so on. A new application domain of viscous dampers for the vibration control under vehicle braking forces is developed, and the influence matrix method is first applied for the parameter optimization of viscous dampers. The present study aims at developing a combined control strategy for vibration mitigations of a suspension bridge induced by vehicle braking forces. The combined control strategy consisting of both viscous dampers and FPBs is developed to reduce the vibration responses in which the influence matrix method is first applied for the parameter optimization of viscous dampers, and the effectiveness of vibration mitigations is verified by numerical analysis
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