Damage Detection Of Plate Structures Under Traveling Loads

When the structure is damaged,the state of the structure needs to be diagnosed and evaluated in order to accurately understand the damage causes and damage degree of the structure.In accordance with the structural damage detection report,the designer evaluates the structural safety and analyzes the dynamic characteristics of the structure.And in order to avoid the occurrence of structural safety accidents,the designer puts forward the best solution for building structure reinforcement maintenance.Like beam column structures,plate structure is a common structure form in engineering,and it is an inseparable part of the main structure,which is widely used in construction,municipal,bridges and other engineering fields.Compared with the software modeling of beam structure,the modeling of plate structure is from one dimension to two dimensions,which is more difficult to model and more complex to analysis.In this paper,damage recognition based on structural response under moving load.External excitation is provided by applying a moving load to the damaged plate and to make the plate vibration.Collecting the transient displacement response data at any point to draw time history curve,and processing the data of time history curve to detect the damage location of the plate structure.This paper studies from the following aspects:Firstly,the mechanical properties of the damaged plate under moving loads are studied by establishing the plate structure's vibration differential equation and the vibration analysis of the damaged plate.Based on this theory,modeling the damaged plate structure under moving loads in the ANSYS software.Select the appropriate damage simulation and mobile load realization method,And according to the change of the load size,the change of the moving load velocity,the distance between the load line and the damage level,comparative analysis the response curve.Secondly,according to the existing conditions of the laboratory model test was designed,and verified by the experiment of simulation results.In the experiment,two kinds of damage types are set up,such as square groove shape and crack shape.And according to the change of the load size,the change of the moving load velocity,the distance between the load line and the damage level,comparative analysis the response curve.Finally,the wavelet method is used to analyze the data of experiment and simulation.Select the Mexico hat function to simulate the data with the continuous wavelet transform.The test data are subjected to noise reduction by wavelet analysis.The research on the damage detection of the plate under moving load has some reference value for other types of structures.