Automatic Measurement of Concrete Deformation Field under Uniaxial Compression Based on DSCM

Abstract

As a kind of optical approach to measure full field deformation with the properties of non-contact, Digital Speckle Correlation Method (DSCM) has been adopted widely with the development of computer technology. The deformation of concrete under external loads is usually uneven and thus it should be characterized by full filed measurement so as to obtain accurate results. It should be effective for engineering to monitor the deformation of concrete by using digital speckle correlation method, and such monitoring is helpful to study the law of uneven deformation of concrete and discover its damage characteristics. The images of the surface of concrete specimens at the different stress were captured and recorded with a high-resolution CCD camera during uniaxial compression process. An own software was developed to analyze these images by DSCM. The nature texture of the specimen surface were searched and matched in different images, therefore the displacement field and the strain field of the surface of concrete specimens were calculated out. Experimental studies have shown that digital speckle correlation method can be well used to calculate the accurate deformation of concrete just through a direct photograph of concrete surface under different loads.