智能CFRP加固RC梁荷载效应的实时模拟与测评

制备了4 根炭纤维复合材料(CFRP) 加固钢筋混凝土(RC) 实验梁, 并在梁内钢筋、混凝土及加固CFRP中预置了布拉格光栅光纤传感器(FBG) 和电阻应变片两种传感器。根据钢筋混凝土理论和ANSYS 有限元软件编制了实验梁受弯荷载效应模拟计算程序。实验表明, 实验梁在受弯承载过程中, 布拉格光栅光纤传感器与传统应变片有完全一致的线性关系; 模拟计算出的实验梁受拉钢筋、压区混凝土应变值及挠度与荷载的关系与CFRP 中FBG的实测值吻合较好。由于对既成RC 结构不能在内部装置传感器(会破坏结构降低抗力) , 采用智能CFRP 加固RC 结构可实现加固和实时健康测评双重功能。 

Real-time simulation and evaluation of load effects for smart CFRP-strengthened RC beams

The smart composite material can be prepared by pre-embedding FBG sensors into CFRP laminates.Four pieces of RC beams were prepared in the experiments,where FBG sensors and electric strain gauges were pre-embedded in the steel,concrete and CFRP in RC beams.A numerical simulation program for flexural load effects of RC beams was compiled based on the theory of reinforced concrete and finite element software ANSYS.The experimental results show that during the load bearing process,the linear relationship of FBG sensor and electric strain gauge is uniform;the numerical simulation results and the measuring results of strains in the tensile steel and the compressive concrete,and the load vs the mid-span deflection agree well.The under-servicing RC structures are diffi-(cult to) mount sensors internally(because the structure will be destroyed and the resistance force will be reduced),so utilizing the smart CFRP strengthened RC structures can realize the dual function of advanced rehabilitation and real-time health monitoring and assessing.