Flexural performance analysis of GFRP profile-concrete composite beams
In order to study to flexural performance of glass fiber reinforced polymer(GFRP)profiled-concrete composite beams,the finite element(FE)analysis software ABAQUS was used to establish numerical model for simulation analysis.The concrete damage plastic(CDP)model was adopted for concrete,and the anisotropy of GFRP profile was taken into consideration.The traction-separation model was used to investigate simulate the bond-slip behavior between GFRP profile and concrete.The simulation analysis was verified by the corresponding experimental results.In addition,the parametric expansion analysis was conducted to investigate the effects of the cross-sectional dimension of concrete and GFRP profile(the height of web,the thickness of web and flange)on the flexural performance of GFRP profiled-concrete composite beams.The results show that the deflection-limit load of composite beam with shear connectors spacing of 100mm is 21.4%and 30.7%,respectively,higher than that of specimens with spacing of 150,200mm.FSK can effectively enhance the shear performance and bonding behavior of the interface.The failure mode of composite beam changes from bending failure to debonding failure when the ratio of concrete height to width exceeds 1.2.Reasonable design of the sectional size of composite beams can efficiently improve the ultimate flexural capacity,maximum deflection and quasi-ductility characteristics of composite beams,and achieve a good balance between mechanical properties and engineering cost.
glass fiber reinforced polymer profiled-concrete composite beamflexural performancebond-slip behaviortraction-separation model
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