Title: Interface Shear Strength under Monotonic and Cyclic Loading
Author(s): Vasiliki Palieraki, Elizabeth Vintzileou, and John F. Silva
Publication: Structural Journal
Appears on pages(s): 17-28
Keywords: cold joints; dowel action; interface shear; natural cracks; shear friction; surface roughness
Provisions for the calculation of interface shear strength have remained unchanged in ACI 318 since the 1980s. The shear friction concept, while simple to apply, does not address many of the most important influencing parameters for interface shear strength. It is silent on cyclic loading, intermediate levels of interface roughness, and the strength of interfaces reinforced with short dowels. To assess the approach included in ACI 318 and to enable the formulation of a new approach, a comprehensive database of test results has been assembled. The results of recent cyclic shear tests performed at the National Technical University of Athens (NTUA) have been combined with the results of investigations conducted worldwide between 1960 and 2020—a total of nearly 1240 tests—to provide a definitive basis for the development of a model for the accurate prediction of interface shear strength under both monotonic and cyclic displacements.