Vibration Control Research On The Multi-span Zigzag-shaped Pedestrian Suspension Bridge Based On TMD

With the continuous development of social economy and the application of new materials in the field of bridges, pedestrian bridge is developing toward the direction of large-span, lightweight and novel. The large-span pedestrian bridge is usually able to meet the requirement of bearing capacity. However, because of its low natural frequency, the pedestrian loads are prone to make the bridge resonate and thus affect the use of the structure. Many bridge incidents of vibration caused by pedestrian load happened at home and abroad, so it is necessary to control vibration. At present, there are two methods to reduce the vibration response of pedestrian bridge, the first method is to increase the stiffness of the structure in order to improve the natural frequency of the structure, and then let it keep away from the range frequencies of pedestrian loads. The second method is to install vibration damping device in the structure, such as isolation bearing, viscous dampers, tuned mass damper (TMD), etc.This paper classifies the common vibration control devices, and introduced the basic principle of TMD and the research status at home and abroad, then reviews and summarizes the research results of scholars at home and abroad in the aspects of pedestrian loads, chooses the suitable pedestrian loads for the structure. This paper briefly introduces the basic principle of dynamic analysis, uses the finite element analysis software ANSYS to simulate a multi-span zigzag-shaped pedestrian suspension bridge. Then we research and analysis the dynamic characteristics of the multi-span zigzag-shaped pedestrian suspension bridge and calculate the vibration response of the structure under a variety of pedestrian loads through the time history analysis.Through setting TMD in the mid-span of suspension bridge, this paper compares the dynamic responses of the structure under pedestrian loads before and after the installation of TMD. Discussing the vibration reduction efficiency of the structure under different step frequency and TMD parameters, and researching the vibration reduction efficiency of the structure under different parameters of MTMD and compared the results with the single TMD. I hope the work in this paper can provide a reference for the design and vibration of multi-span zigzag-shaped pedestrian suspension bridge in the future.