Vibration Control of Stress-ribbon Bridge Based on Outrigger-Negative Stiffness Damped Principle
With the improvement of urban construction level and the development of tourism industry,the demand for the construction of large-span pedestrian landscape bridges continues to increase.Stress-ribbon bridges are gradually applied in the pedestrian landscape bridges because of their simple structural form and beautiful architec-tural appearance.However,they are prone to vibration under dynamic loads such as wind and pedestrians due to the low natural frequency,tight modal spacing.Therefore,based on the outrigger-negative stiffness damped principle,a stress-ribbon bridge vibration reduction control strategy is proposed to control the vibration.Firstly,the general-ized motion equation of the system is established by the Euler Bernoulli beam theory.And a method for calculating the dynamic characteristics of the system based on complex modes is proposed.Secondly,the influence of key pa-rameters of the stress-ribbon bridge negative stiffness control system on the dynamic behavior of the system is sys-tematically studied,and the design criteria for key parameters are determined.Finally,the effectiveness of the pro-posed control strategy for stress band bridge induced vibration control was verified through case analysis and com-parison.The proposed stress-ribbon bridge vibration reduction control method and corresponding parameter deter-mination criteria can provide reference for the construction of stress band bridges in practical engineering.
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