Study on Flexural Stiffness of High-strength Concrete-filled High-strength Circular Steel Encased with I-shaped CFRP
In order to provide references for the design and engineering application of high-strength concrete-filled high-strength circular steel encased with I-shaped CFRP(CHCFHST-CFRP),the bending stiffness of this kind of member was studied.Three CHCFHST-CFRP members were designed and tested under pure bending.The finite element software ABAQUS was used to establish the numerical analysis model of these pure bending members.Based on the agreement between the numerical simulation and the experimental results,the influence of each parameter on the bending stiffness of the members was analyzed.The calculation formulas of bending stiffness and deflection suitable for pure bending members were derived.There was no fracture occurred in the test specimens,and there was no local bulging occurred in the steel tube.After unloading,there was obvious rebound in the pure bending section.With the increase of concrete strength,steel tube wall thickness and profile size,the bending stiffness of the component increases slightly.Compared with the components without CFRP profiles,the bending stiffness of the components with CFRP profiles has increased significantly.The whole specimen was in bending failure mode,with good deformation ability,strong energy dissipation ability and stiffness degradation ability.The calculated values obtained by the formula derived by the author are in good agreement with the experimental results,and the formula can be used to calculate the bending stiffness and deflection of such components.
I-shaped CFRP profilehigh-strength concrete-filled high-strength circular steel tubeflexural stiffnesscalculation formula
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