Comfort Analysis And Control Measures Of Pedestrian Caused By Vibration Caused By Simple Rigid Suspension Bridge

The mountains in Jinsha River Basin of Yunnan Province fluctuate greatly,and the unique geographical environment leads to the backward local economy and travel difficulties.In order to facilitate the travel of local residents,to make full use of local resources,it has become a top priority to build a bridge to meet the daily life of local residents.Due to the high construction and maintenance cost,the construction of large-span rigid suspension bridge is not suitable for the construction of low-grade highway in poor areas,while the flexible suspension bridge has the advantages of large span,relatively less investment,reasonable economy and strong ability to adapt to the terrain,so it naturally becomes one of the important bridge types in such areas.Due to the fact that flexible suspension Bridges are usually used as simple Bridges,which are often used in temporary passages or park entertainment facilities,the research on the vibration response of flexible suspension Bridges under the action of vehicle-bridge coupling has been relatively neglected in the present research.Taking Salatong Bridge in Tuoding Township,Yunnan Province as an example,this paper analyzes the vibration comfort of suspension bridge by finite element software,and gives the working conditions that meet the comfort requirements of pedestrians,which can provide reference for the design or research of flexible suspension bridge in the future.In this paper,the vibration comfort of flexible suspension bridge is studied as follows:(1)Finite element software is used to establish the finite element model of the suspension bridge,and the natural vibration frequency and vibration mode of the structure are extracted.According to the data provided by predecessors,the types of cars driving on the low-grade highway in Yunnan mountainous area are classified,and the weight and speed of the most common cars driving on the low-grade highway in Yunnan mountainous area are analyzed,so as to provide reference for the future working condition design.(2)The finite element software is used for time history analysis,and the control variable method is used to analyze the dynamic response of the coupling effect between the moving load with the same weight but different speed and the moving load with the same speed but different weight and the bridge.The peak acceleration of different working conditions is obtained,and the comfort index of pedestrians on the bridge is evaluated.(3)The overall model of wind-vehicle-bridge was established,and the dynamic response analysis was carried out on the working conditions with different wind speed,moving load weight and speed,and the peak acceleration of different working conditions was obtained,and the pedestrian comfort was evaluated.