A test of EM sensor application on PC tendon tensile force monitoring

Elasto-Magnetic (EM) actual-stress measurement method by utilizing the sensitivity of incremental magnetic permeability due to stressc hangeh as been beingd eveloped Previously, it has been proved that E M measurement method enable to measure actual-stress of steel wire, PC bar and PC strand contactlessly without destroyingt heir polyethylenec overing sheath. Furthermore monitoring tensile force of PC tendon is the most important issue in PC structure maintenance management. Therefore, in this paper, in order to grasp the reliability of EM sensor for field-application purpose, a test of tensile force monitoring on PC tendon of outercable PC beam by utilizing EM sensor was conducted As the result of the test, it is conformed that EM stress measurement technology can provide adequate accuracy and reliability to monitor tensile orce of PC tendon duringa life-cycle of PC structur