Mechanical properties of longitudinal steel bar C-shaped groove connection under uniaxial tension
In order to improve the construction efficiency of prefabricated longitudinal reinforcement connection,the C-shaped groove connection method was proposed.Nine connectors were made and uniaxial tensile tests were carried out to observe their failure modes.The load-displacement curve and strain development process of specimens were studied,and the influence of different anchor plate diameters on the connection performance of connectors was analyzed.Based on the calculation formula of local compression of concrete,the calculation formula of bearing capacity of C-shaped groove connection steel bar was derived.The fitting table of different anchorage plate diameters and the diameter of steel bar with anchorage plate was given.The results show that the connector with anchor plate diameter of 43 mm and 48 mm has tensile failure of steel bars with anchor plate,and the load-displacement curve is similar to the load-displacement curve of single steel bar,which can meet the strength requirements of JGJ 107-2016 and ACI 318.Anchor plate diameter of 38 mm connector is based on JGJ 256-2011 specification to select the diameter of the anchor plate,and the pull-out failure of the steel bar with anchor plate occurs during the test.It is proved that according to the specification,the diameter of the anchor plate is too small to meet the connection requirements.The load-displacement curve of the connector with the diameter of 38 mm is wavy.Although the bearing capacity is less than the former two,it still has good ductility and high residual bearing capacity.The C-shaped grooves of all connectors have small strain values throughout the loading process and are always in the elastic stage.The circumferential strain of C-shaped grooves is compressive strain.The theoretical calculation results of bearing capacity of C-shaped groove connection steel bar are consistent with the experimental results.
steel bar connectionC-shaped groove connectionuniaxial tensiondiameter of an-chor plate
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