Numerical modelling of the shear strength between concrete layers
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
Some of the most used strengthening techniques for reinforced concrete structures include the increase of existing cross-sections. The monolithic behaviour of the strengthened elements depends basically on the interface between the substrate and the new concrete layer. A complete numerical model capable of dealing with the composite response of these RC elements is still missing. Such a model mainly depends on the interface behaviour, namely shear friction and dowel action. A numerical model is calibrated using experimental data carried out to assess the longitudinal shear strength between two concrete layers with different values of added rein- forcement. A parametric study is developed to identify the influence of the following parameters on the interface behaviour: elastic stiffness; cohesion; internal friction angle; fracture energy; dilatancy; steel constitutive law and the bond-slip relation between connectors and concrete. The role of each parameter is clarified and the most relevant conclusions are presented.