Analysis On The Vibration Modal And Life Estimation On Diaphragm Of Shanghai Yangtze River Tunnel And Bridge Based On WIM Data

In recent years,Cable-stayed Bridge was favored by many people gradually.And then the Bridge Seismic damage and bridge fatigue problems also became one of the focuses of people's attention.This paper takes the Shanghai Yangtze River Tunnel and Bridge as the engineering back-ground,analyzing its dynamic characteristics,focusing on the diaphragm fatigue damage degree of the cable-tower anchor box and the steel box girder in the main channel cable-stayed bridge.And then make the life estimation.The main contents are as follows:1.Introduce the development of cable-stayed bridge,Bridge Seismic damage and some problems of steel bridge fatigue.Make a relevant theory overview to the major part in this paper,including the fatigue life analysis method under constant amplitude and variable amplitude,and five cumulative fatigue damage theories.Then choose the fatigue life analysis method and cumulative fatigue damage theory in this paper.2.Introduce the WIM system,by which collecting four vehicle data.According to vehicle related manual and vehicle classification,classify the vehicle and get five vehicle classification.Depend on equation of the equivalent axle load and equivalent wheelbase,obtain the relative vehicle axle load and wheelbase data.3.Model the whole bridge using the ANSYS,analyzing its dynamic characteristics.Then model ling the cable-tower anchor box and the steel box girder,determine the fatigue details' position on diaphragm.Loading the vehicle loads on the sub-model dynamically,get the fatigue details' stress process.4.Change the stress process into stress spectrum using water discharge method,drawing the S-N curve rely on British standard BS5400,calculating fatigue details' damage.Then calculate the fatigue life of fatigue details by Miner accumulated damage theory.Make an analysis and estimation to it.