Theoretical study on constitutive relationship of fiber reinforced polymer confined concrete |
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| Authors: | ZHANG Li-wen ZHANG Jun-ping and SUN Zhuo |
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| Institution: | 1. Bridge Engineering Department, Tongji University, Shanghai 200092, P. R. China
2. Civil Engineering College, Guangzhou University, Guangzhou 510006, P. R. China |
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| Abstract: | We proposed a bilinearity constitutive curve model of fiber reinforced polymer (FRP) confined concrete which includes a parabola in the fast stage and a straight line in the second stage. The FRP-confmed concrete has powerful confinement status and weak confinement status leading to different equations of parabola. We analyzed the impacts of factors such as confinement ratio and restrain stiffness on confined concrete compressive strength, ultimate strain and other control parameters through finite element analysis. The results show that the confinement ratio determines the confinement status, and the increase of the confinement ratio has a limited capacity to increase the compressive strength. The deformation of confmed concrete is influenced by restrain stiffness. The stronger the restrain stiffness is, the less the lateral deformation is and the greater ultimate axial swain will be. The consideration of equivalent section coefficient k is needed in the non-circular section confmed concrete. We analyzed the results and proposed boundary values of strong and weak confinement styles, a peak/inflection point stress and swain model, and a compressive strength and ultimate strain model. |
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| Keywords: | numerical simulation fiber reinforced polymer confined concrete stress-swain curve dimension analysis |
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