Damage Identification And Life Prediction Of Simply Supported Girder Bridge Based On Strain Influence Line

The main task of structural damage identification is to answer whether there are defects in the structure.Secondly,the task of structural damage identification is to determine which parameters are sensitive to the damage and locate the damage further.Damage identification method of bridge structure based on strain influence line studies around the four main contents of damage identification of bridge structure are as follows:damage qualitative analysis,damage localization,damage quantification and life prediction.By comparing the measured strain influence line with the theoretical strain influence line to determine whether the bridge structure damage and the location of the damage.Combined with the experimental and theoretical models,a model similar to the actual structure was obtained and applied to the damage identification and the remaining life prediction of the bridge structure.The main work of this paper is as follows:In this paper,two model experiment was carried out.Experiment 1 sets a simply supported girder bridge as the model to explore the influence law of sensor layout,it is concluded that the reasonable layout method of strain sensor.Experiment 2 sets different position working condition of varying degrees of damage,to explore the change rule of structural strain after injury to obtained the general method of damage qualitative and damage location.To modify the model by using ANSYS,and identify the damage degree.To explore how to use ANSYS to solve structural reliability,and compare the advantages based on correction model to solve the reliability.To explore how the time-varying reliability theory combined with finite element software,the time-variant reliability of solving the damage model and predict the residual life of bridge structure.