This paper investigates the composite action of forty-six segments representing precast concrete 10 sandwich panels (PCSP) using the Carbon Fiber Reinforcement Polymer (CFRP) grid/rigid foam as shear 11 mechanism. Various parameters believed to affect the shear flow strength for this CFRP grid/foam system 12 were examined. The parameters that were considered are the spacing between vertical lines of CFRP grids 13 and the thickness of the rigid foam. The research includes comprehensive experimental program that was 14 conducted to determine the characteristics of the shear transfer mechanism of the CFRP grid/rigid foam. 15Results of the experimental program indicated that increasing the spacing between vertical lines of CFRP 16 grid increase the overall shear flow strengths due to the increase of the bonded contact area of the rigid foam 17 and the concrete surface. However, it should be noted that the overall shear stresses were decreased due to 18 the increase of interface surface area. Test results also indicated that increasing the rigid foam thickness 19 decrease the overall shear flow strength. A non-linear 3-D FEM analysis was performed to model the 20 behaviour of the test specimens and to study the behaviour of PCSP. Results of FEM analysis were found in 21 good agreement with the experimental results. Design equation was developed to determine the shear flow 22 strengths for given CFRP grid/foam systems. The parametric study was performed to predict shear flow 23 strength of different fiber reinforced polymer materials, rigid foam thickness and spacing between vertical 24 lines of the grid. 25
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