Study On Safety Early Warning Index System Of Concrete Cable-Stayed Bridge

In this paper,the Yellow River Bridge in Jinan is used as the engineering background.The three kinds of limit states of Jinan Yellow River Bridge are studied by finite element simulation.The health warning system is established,the monitoring data collected from the health monitoring system is analyzed,and the health status of Jinan Yellow River Bridge is evaluated by combining the early warning system TheAccording to the structural parameters of the bridge structure of Jinan Yellow River,the finite element model is established and the finite element model is modified to make it more consistent with the force and deformation state of the bridge.According to the structural characteristics of the bridge structure,the structure is selected under various limit states Of the early warning indicators,the use of Midas analysis of the early warning indicators of the structure of the impact line,the mobile load the most unfavorable loading position.Combined with the definition of load in the normal use limit state and load capacity under the limit of the bridge design,the relevant load combinations are designed and loaded according to the most unfavorable loading position.The response value of the finite element model under the various load combinations is calculated,and the response maximum value of the finite element model under the two limit states is obtained.This paper introduces several common seismic theory of structure,and introduces the Pushover and energy spectrum of earthquake resistance based on structural performance.The process of solving structural performance points under earthquake load is given.According to the analysis characteristics of Pushover and the structural characteristics of Jinan Yellow River Bridge,the model of the cable tower and main beam of the Yellow River Bridge is separated,which represent the structural response of the whole bridge model under the action of seismic load and vehicle load.In this paper,the pushover analysis of the pagoda and the main beam model is carried out,and the yield displacement of the bridge and the main girder under the action of seismic load and vehicle load is given,and the bridge of the Yellow River is established under the action of earthquake and vehicle load.Of the yield limit state.Through the simulation of three ultimate states of Jinan Yellow River Bridge by finite element software Midas,the three-stage limit state early warning system of Yellow River Bridge is established.This paper introduces the method and process of the early warning system of cable-stayed bridge,analyzes the health monitoring data and combines the early warning system to make a reasonable assessment of the health status of the Jinan Yellow River Bridge.