Study on Failure Mechanism and Influencing Factors of Ultimate Bearing Capacity of PBL Shear Connector
The finite element models of steel fiber reinforced concrete and ordinary concrete PBL shear connectors were established respectively.Concrete adopts the constitutive model of damage plasticity,and steel fibers were randomly distributed in the concrete matrix.The results show that the failure modes of steel fiber reinforced concrete PBL shear key and ordinary concrete PBL shear key are mainly the shear failure of steel fiber reinforced concrete tenon and internal through reinforcement,and the through crack of steel fiber reinforced concrete wrapped parallel to the steel plate.The addition of steel fiber improves the strength and toughness of PBL shear key structure.A set of orthogonal table Li6(45)for numerical test of steel fiber reinforced concrete PBL shear key with 5 factors and 4 levels is designed by orthogonal test method,and the influence of various factors on the ultimate bearing ca-pacity of steel fiber reinforced concrete PBL shear key is discussed by range analysis method.The op-timum ratio is:the diameter of the through steel bar is 12 mm,the diameter of the hole is 33 mm,the thickness of the steel plate is 10 mm,the strength grade of steel fiber concrete is C65,and the steel fi-ber content is 0.5％.The results show that five factors,such as the diameter of through steel bar,the thickness of steel plate,the diameter of hole,the strength of steel fiber concrete and the content of steel fiber,have significant effects on the ultimate shear capacity of PBL shear bond.
PBL shear connectorsteel fiber reinforced concreteultimate bearing capacitynumerical simulationorthogonal test
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维普
