Circumferential strain measurement of high strength concrete in triaxial compression by fiber optic sensor

This paper deals with circumferential strain measurement for concrete in tr iaxial compression by using fiber optic sensing system. A fiber optic sensi ng system was developed to measure the elongation of the optical fiber for cylindrical concrete specimen in triaxial compression by using white light interfering. And a theoretical model describing the relationship between th e elongation of the fiberglass and the circumferential strain of cylindrica l concrete specimen in triaxial compression was proposed, too. Some tests w ere done to verify the measurement method. The results indicate that the pr oposed method is valid. (C) 2001 Elsevier Science Ltd. All rights reserved.