| The long time served steel structures are faced with many difficulties such as material performance degradation, which bring the growing market of steel structure strengthening. Carbon Fiber Reinforced Polymer (CFRP) has gained more and more attention in engineering world for its high strength-to-weight and stiffness-to-weight ratios, corriosion resistance. It has been widely used and deeply researched in FRP reinforce concrete and aviation aluminumfield, which support the usage and research of CFRP reinforce steel structure. Based on the researches carried by domestic and overseas researcheres and the laboratory situations, a new type of double shear CFRP-steel specimen is designed.Based on the ideas above, double shear CFRP-steel specimen is carried on tensile test, including:31 specimens in 4 sorts which focus on the length, width, thickness (number of layers) of CFRP and curing time of specimens individually are researched to collect the datum of time-load, time-strain relationship.The strain distribution curves, load-transformation curves, the bond-slip curves and the influence of each parameter are received by analysising the datum. Based on the result of the experiment and the existing bond-slip model of FRP-concrete and CFRP-steel, a new type of bond-slip model and a corrected type of design formula are put forward.11 specimens in 5groups about different curing time are detailed researched to achieve the hardening rule of the CFRP-steel pasting interface. Also the bond-slip model is corrected about the curing time by the experiment datum.A theorital analysis about the CFRP-steel pasting interface is carried out to achieve the theorital strain distribution. The result is comparied with the experiment datum. |
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