Application Of DIC Measurement Method In Shaking Table Test Of Circular Column

Circular section column is widely used in practical engineering,and its seismic performance research is an important part of the whole structure seismic design.The quantitative description of the crack development of a cylinder in seismic activity is an important problem to realize the design of seismic bearing capacity of the column.Three dimensional digital image correlation(3D-DIC)with its advantages of high precision,non-contact,full field measurement,and fast data acquisition,is helpful to achieve multi angle and accurate deformation detection.The application of threedimensional digital image correlation method in the seismic performance of columns is an important means to promote the informatization,digitization and visualization of the seismic performance of columns.Based on the research of experimental model and theoretical method,the theory of digital image correlation method,three-dimensional measurement method of 360 ° cylinder,shaking table test of similar cylinder model and finite element simulation of cylinder ground motion are studied in this study.Based on the analysis of theoretical and experimental research,this paper studies the problems that may occur in the measurement process of the cylindrical similar model,proposes a 360 ° digital image correlation detection method,improves the system layout,operation process and data analysis,and analyzes the accuracy of the proposed detection method,among which the cubic interpolation method is the best,and the fitness index reaches 0.88,The accuracy of the interpolation method is verified.Through the combination of digital image correlation method and traditional measurement method,the strain field on the model surface is obtained,and the response of acceleration,displacement and strain,the law of stiffness degradation and the mechanism of earthquake damage are studied.The traditional measurement method is compared with the strain results of the digital image correlation measurement method to verify the accuracy and feasibility of the digital image correlation method.Based on ABAQUS,this paper analyzes the accuracy and applicability of numerical simulation of shaking table test of cylindrical seismic simulation,compares with the test data,and analyzes the deformation degree of columns.