Intelligent Reinforcement Design For Structural Reinforcement And Structural Health Monitoring

Structural reinforcement and structural health monitoring(SHM) play an important role for protecting the security of stuctures in civil engineering. Fiber reinforced polymer(FRP) with its light weight, high strength, good corrosion resistance has become popular in the field of structural reinforcement materials. With the development of optical fiber(OF) sensing technology, new research results are applied to the field of structural health monitoring. Optical fiber sensor, as a modern means of monitoring, has become an important component in SHM system. Optical fiber sensors or other sensing elements combined with FRP can be produced as new smart materials, which can realize SHM and structural reinforcement, and has broad application prospects in engineering.Smart composite reinforcements which consists of FRP and optical fiber sensors or resistance strain gauges are produced. Their design ideas, performance, reinforcing effect, application to actual structures are ex plored. First, theories and factors to be considered used in designing of smart composite reinforcement are introduced, and two kinds of smart composite reinforcements are produced for reinforcement experiments of double metal composite beams and normal working life experiments of optical fiber buried in the OF-FRP. Stress and damage states of bending specimens are studied by experiments and finite elements. Second, experiments of normal stress distribution along the height of double metal composite beams at different connection forms when subjected to pure bending loads are conducted, and stress monitoring and reinforcement effects of smart composite reinforcements used in double metal beams are studied. Then the finite element models of composite beam experiments are established for simulation, calculation, analysis, and obtaining numerical solutions coinciding with experimental solutions. Finally, the smart composite reinforcement s are used in concrete plates with cracks of different depth, and the effects of glue’s type and thickness are obtained by finite element numerical simulation.Based on theoretical, experimental and finite element simulation, smart composite reinforcements are designed and made for reinforcement of composite beams and stress monitoring. The reinforcing effects of different glues on the plates with cracks are obtained by numerical simulating, providing a reference to a variety of practical projects of the smart composite reinforcements.