Real-Time Monitoring and Simulating the Load Effects of Smart” CFRP- Strengthened RC Beams

Abstract

FBG sensors have excellent compatibility with CFRP sheets. It can be embedded into CFRP sheets to fabricate the “smart” CFRP. This paper conducted 4 pieces of CFRP-strengthened RC beams, and embedded FBG sensors and strain gauges on the steel, concrete and CFRP of RC beams. The simulation program of flexural load effects of RC beams is compiled based on the theory of reinforced concrete and ANSYS. The experimental results show that during the load bearing process: the compatibility is perfect between FBG sensor and CFRP; the linear relationship of FBG sensor and strain gauge is uniform; the numerical simulation results and the measuring results of strains of tensile steel and compressive concrete, the load agree well. So utilizing the smart CFRP strengthened RC structures can realize the dual function of advanced rehabilitation and real-time health monitor and evaluation.

An Experimental Investigation on Flexural Behavior of Reinforced Concrete Beams Strengthened by an Intelligent CFRP Plate with Built-In Optical Fiber Bragg Grating Sensors

“…On the basis of the calculation results, the anchorage set of the wedge-type anchorage is relatively smaller comparing to the flat anchorage and waveform anchorage. Up to date, there are no recommendations on the anchorage set of wedge-type anchorages in the current specifications [30][31][32]. Thus, according to this calculation, it 8 Journal of Sensors is necessary to recommend using 0.8 mm as an initial anchorage set since a certain degree of safe redundancy is taken into account.…”

“…More recently, the use of a structural health monitoring systems (SHMS) for evaluating the durability, serviceability, and safety of the structures reinforced through composite materials in real time shows great potential by incorporating fiber optical sensors (FOSs) in composite materials during its forming process (e.g., wet lay-up process or pultrusion process); they offer a variety of advantages, for example, durability in harsh environment, immunity to electromagnetic interference, small size, and higher material compatibility. The FBG sensing technology with great potential for applications in the FOSs embedded into the composite materials is used for strain and temperature sensing at the local control section of strengthened members owing to its high sensitivity, repeatability, accuracy, and quasi-distributed and single-ended measurement [29][30][31][32][33][34][35][36][37][38][39][40]. Lu and Xie exploited the smart hand wet laid-up CFRP sheets embedded with the FBG sensor to strengthen the RC beams, and the load effect of the strengthening RC beam has been assessed by the smart CFRP sheet measurements [30,31].…”

“…The FBG sensing technology with great potential for applications in the FOSs embedded into the composite materials is used for strain and temperature sensing at the local control section of strengthened members owing to its high sensitivity, repeatability, accuracy, and quasi-distributed and single-ended measurement [29][30][31][32][33][34][35][36][37][38][39][40]. Lu and Xie exploited the smart hand wet laid-up CFRP sheets embedded with the FBG sensor to strengthen the RC beams, and the load effect of the strengthening RC beam has been assessed by the smart CFRP sheet measurements [30,31]. Wang and Zhou proposed a smart composite laminates embedded with FBG sensor into the interlayer of the FRP during the wet lay-up process, and their sensing precisions of strain and temperature have been predicted experimentally [33].…”

Smart aggregate based damage detection of circular RC columns under cyclic combined loading

“…Various sensors and methods have been developed for damage detection and health monitoring. Fiber optical sensors (FOS), especially fiber Bragg grating (FBG) sensors, are now used for the health monitoring of various RC structures (Zhang et al 2006, Ren et al 2006, Lu and Xie 2006, Chen and Ansari 1999. However, FOSs are fragile, expensive, and offer only local measurements, limiting their applications.…”

Multi-functional smart aggregate-based structural health monitoring of circular reinforced concrete columns subjected to seismic excitations

“…Damage detection and failure analysis of concrete structures have been studied for many years and various sensors and methods have been developed for damage detection and health monitoring of these structures. Fiber optical sensors (FOS), especially fiber Bragg grating (FBG) sensors, are now used for the health monitoring of various RC structures (Zhang et al 2006, Ren et al 2006, Lu and Xie 2006, Chen and Ansari 1999. However, FOSs are fragile and offer only local measurements.…”