Design Parameter Optimization And Vibration Research Of Pedestrian Suspension Bridge

With the rapid rise of pedestrian glass suspension bridge,the data accumulation of static and dynamic research and seismic performance of this new type of bridge is insufficient.At present,the above research mainly focuses on conventional suspension bridge.In this paper,a pedestrian glass suspension bridge in a scenic spot is built by MIDAS / civil 2015.Firstly,the static and dynamic characteristics of the whole bridge are studied,and the structural parameters are analyzed to optimize the design.Secondly,the seismic strength of the bridge site is studied.The main work is as follows:(1)Model building: combine the existing scheme with MIDAS / civil 2015 to find the shape,explore the difference of the alignment and internal force of the main cable and anti wind cable before and after the combination,and study the stress safety of each component of the bridge in the construction stage and after the completion of the bridge.(2)Static analysis: carry out single load and multiple load combination analysis on dead load,wind,crowd,temperature and uneven settlement of foundation,verify the safety of bridge in normal operation,and get the most unfavorable load combination of each component and the influence degree of each single load on the component.At the same time,the static parameter analysis is carried out to demonstrate the design scheme.(3)Dynamic analysis: explore the natural vibration characteristics of the bridge,and judge whether it is easy to occur resonance damage during operation.Then,the dynamic parameter analysis is carried out,and two optimization points are put forward to increase the pre tension of the wind cable and improve the restraint mode of the bridge.It is concluded that it is necessary to set up anti wind cable for this kind of bridge and the advantage of adding central buckle to improve the rigidity of the whole bridge.(4)Aseismic design: under the action of E1 earthquake,through two methods of response spectrum and dynamic time history,the internal force and displacement law of bridge tower are compared and studied,and it is judged that it is in the elastic stage.Under the action of E2 earthquake,the moment curvature curve verifies that the bridge tower is still in the elastic stage and meets the requirements of the code.