Real-time simulation and evaluation of load effects for smart CFRP-strengthened RC beams
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摘要: 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。
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关键词:
- 布拉格光栅传感器 /
- 炭纤维复合材料(CFRP) /
- 钢筋混凝土(RC) 梁 /
- 加固 /
- 荷载效应 /
- 数值模拟
Abstract: The smart composite material can be prepared by pre2embedding FBG sensors into CFRP laminates.Four pieces of RC beams were prepared in the experiment s , where FBG sensors and elect ric st rain gauges were preembedded in the steel , concrete and CFRP in RC beams. A numerical simulation program for flexural load effect s ofRC beams was compiled based on the theory of reinforced concrete and finite element sof tware ANSYS. The experimental result s show that during the load bearing process , the linear relationship of FBG sensor and elect ric st raingauge is uniform; the numerical simulation result s and the measuring result s of st rains in the tensile steel and thecompressive concrete , and the load vs the mid-span deflection agree well. The under-servicing RC structures are difficult to mount sensors internally (because the st ructure will be dest royed and the resistance force will be reduced) ,so utilizing the smart CFRP st rengthened RC st ructures can realize the dual function of advanced rehabilitation andreal-time health monitoring and assessing. -
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