Pure Shear Performance of Steel- Concrete Interfaces with Stud Shear Connectors of Diverse Geometric and Embedding Conditions

摘要

The present study represents an attempt to fulfill the need to investigate the performance of the pure shear effect on the interface between concrete and steel containing stud shear connectors with the effects of the main parameters. The studied parameters are the shear-connection distribution, the headed studs deformability and the grade of concrete embedment to enhance the desirable mechanical properties and to have awareness of the undesirable ones. Accordingly, four push-out prototypes with different properties are experimentally studied, where the ultimate shear capacity, relative slip, shear stiffness and the energy absorbability are evaluated. It is found that doubling the grade of concrete embedment significantly decreases the prototype ultimate shear force, relative slip and shear toughness by 7.5%, 33% and 23%, while reduction of the headed shear stud length by half has negative effects on ultimate shear force, peak slip, shear stiffness and modulus of shear toughness by 13%, 37.5%, 49%, and 30%. Furthermore, effect of doubling the level of the headed stud distribution for a constant degree of partial interaction causes increases in ultimate shear force, peak slip and modulus of shear toughness by 7.5%, 7%, and 10%. Behavior of the tested push-out segments is predicted using the concrete plastic damage approach in a present finite element model by ABAQUS. It accurately predicts the response where the high agreement of the numerical model predictions with the experimental evidence stands as a definite witness to the reliability of the present ABAQUS model.