Ultra-high performance concrete(UHPC)components,such as non-stirrup beams,are usually designed in thin-walled forms to meet the needs of prefabricated structures.In order to improve the shear capacity of non-stirrup UHPC beams and simplify the construction,a new structural form of non-stirrup UHPC beams encrusted with external steel plates was proposed.Seven UHPC beams were tested for their shear performance with the area,spacing,inclined angle,and single or double side arrangement of steel plates taken as parameters,and the crack distribution,failure mode,shear capacity and shear ductility of the beams were obtained.Based on the truss-arch theory,a calculation model for the shear capacity of the non-stirrup UHPC beams encrusted with external steel plates was proposed,and the corresponding calculation formula was derived.The results showed that the externally encrusted steel plates can effectively improve the shear strength of non-stirrup UHPC beams,the diagonal cracks can cross the steel plates,and the steel plates can play a similar role as the stirrups.Converting the shear contribution of stirrups into equivalent steel plates,the bearing capacity of the beam encrusted with external steel plates was slightly lower than beam with stirrups.Under the same amount of steel,the single and double side arrangement of the steel plates had little effect on the bearing capacity.The cracks were more fully developed when arranging diagonal steel plates,and the beams encrusted with steel plates on both sides showed better shear ductility.According to the truss-arch theory,the ratio of the theoretical result to the experimental result was 1.02,indicating that they were in good agreement.The beam encrusted with diagonal steel plates exhibits good structural performance and has great research potential and application prospects.
UHPC beamencrusted with external steel platesshear behaviortruss-arch modelshear ductility
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