TY - GEN
T1 - Self-sensing properties of CFRP and OFBG-GFRP bars for concrete structures
AU - Ou, J.
AU - Wang, B.
AU - Zhang, X.
AU - Zhou, Z.
N1 - Publisher Copyright:
Copyright © 2003 by DEStech Publications, Inc. All right reserved.
PY - 2003
Y1 - 2003
N2 - In this paper, two kinds of reinforced bars with self-sensing properties are put forward for concrete structures, one is carbon fiber reinforced polymer (CFRP) bar and another one is the combined bar of optic fiber Bragg grating and glass fiber reinforced polymer. In the first part, the CFRP bars with various diameters are made and their mechanical and stress or strain self-sensing properties are tested. And then 5 concrete beams reinforced with CFRP bars are also made and the mechanical properties of beams and self-sensing properties of CFRP bars embedded in the beams are tested. The tested results show that CFRP bars possess pretty good stress or strain sensing properties besides their excellent mechanical properties such as high tensile strength and appropriate elastic modulus. The change of electrical resistance of CFRP bars with the tensile stress is linear and the maximum change of electrical resistance can reach 30-45% of the initial value. But the change of electrical resistance of CFRP bars embedded in the beams with the applied force is much dispersing, and the measuring approach for the electrical resistance change needs to be improved further. In the second part, the OFBG-GFRP bars are made and their mechanical and stress or strain self-sensing properties are tested also. The tested results show that the stress or strain sensing properties of bars are the same good as common OFBG sensors, but GFRP can provide well protection for OFBG and also the bars can play the reinforced role in the concrete structures. The OFBG-GFRP bars as the reinforced bars as well as the stress or strain sensors are very convenient in their installation in concrete structures. The comparisons of the CFRP bar with the OFBG-GFRP bar show that the measuring system of CFRP bar as a sensor is much more cheaper than that of OFBG-GFRP bar since the measured signal of CFRP bar is the electrical resistance, but the local strain or damage localization is difficultly judged by using the measured electrical resistance change since the change are the total electrical resistance change of CFRP bar in its whole length.
AB - In this paper, two kinds of reinforced bars with self-sensing properties are put forward for concrete structures, one is carbon fiber reinforced polymer (CFRP) bar and another one is the combined bar of optic fiber Bragg grating and glass fiber reinforced polymer. In the first part, the CFRP bars with various diameters are made and their mechanical and stress or strain self-sensing properties are tested. And then 5 concrete beams reinforced with CFRP bars are also made and the mechanical properties of beams and self-sensing properties of CFRP bars embedded in the beams are tested. The tested results show that CFRP bars possess pretty good stress or strain sensing properties besides their excellent mechanical properties such as high tensile strength and appropriate elastic modulus. The change of electrical resistance of CFRP bars with the tensile stress is linear and the maximum change of electrical resistance can reach 30-45% of the initial value. But the change of electrical resistance of CFRP bars embedded in the beams with the applied force is much dispersing, and the measuring approach for the electrical resistance change needs to be improved further. In the second part, the OFBG-GFRP bars are made and their mechanical and stress or strain self-sensing properties are tested also. The tested results show that the stress or strain sensing properties of bars are the same good as common OFBG sensors, but GFRP can provide well protection for OFBG and also the bars can play the reinforced role in the concrete structures. The OFBG-GFRP bars as the reinforced bars as well as the stress or strain sensors are very convenient in their installation in concrete structures. The comparisons of the CFRP bar with the OFBG-GFRP bar show that the measuring system of CFRP bar as a sensor is much more cheaper than that of OFBG-GFRP bar since the measured signal of CFRP bar is the electrical resistance, but the local strain or damage localization is difficultly judged by using the measured electrical resistance change since the change are the total electrical resistance change of CFRP bar in its whole length.
UR - https://www.scopus.com/pages/publications/34147211101
M3 - 会议稿件
AN - SCOPUS:34147211101
T3 - Structural Health Monitoring 2003: From Diagnostics and Prognostics to Structural Health Management - Proceedings of the 4th International Workshop on Structural Health Monitoring, IWSHM 2003
SP - 1431
EP - 1438
BT - Structural Health Monitoring 2003
A2 - Chang, Fu-Kuo
PB - DEStech Publications
T2 - 4th International Workshop on Structural Health Monitoring: From Diagnostics and Prognostics to Structural Health Management, IWSHM 2003
Y2 - 15 September 2003 through 17 September 2003
ER -