TESTING STUDY OF TWO METHODS FOR INSTALLING FIBER BRAGG GRATING SENSING IN PHC PIPE PILES

This paper examines the penetration tests on pretension high-strength concrete(PHC pile) piles with fiber Bragg grating sensing technology at a site. Two buried methods for installing the sense onto the pile are used. One method grooves on the PHC pile. The other implants in the PHC pile. The pile shaft force curves and the behaviors of base resistance are compared. It reveals that the pile shaft force of two buried methods decreases with the increasing of pretension depth. The transfer rate of the pile shaft force and the slope of curves are closed. The test result of base resistance from the method of implanting in the PHC pile is less than that of the method of grooving on the PHC pile, but the range of difference is small. The survival rate of fiber Bragg grating sensing sensors using the implanting in the PHC pile is high. Such reliable data show that the implanting method can be used in stress measurement of PHC pile.