Configuration and Size Effects on Bond Stress-Slip and Failure Modes of RC Connections

Abstract

AbstractBond slip of RC structures occurs wherever primary cracks are present. These cracks usually appear at the beam-column and column-foundation joints, for example, when structures are subjected to seismic loadings. As a result, it is imperative to consider bond slip in performing an accurate evaluation of the response of RC structures. The distributions of stress and strain in an embedded rebar vary depending on the geometry, such as concrete cover and embedment length, which are referred to here as configuration effects. Because bond stress and bond slip can be defined as functions of stress and strain of the embedded rebar, respectively, the relationships of bond stress and bond slip also differ. This, in turn, leads to different crack patterns: splitting cracks, shearing-off failures, or no cracks in the concrete. These differing crack patterns also cause distinct governing failure modes involving splitting failure, shearing-off failure, and bar fracture, respectively. Consequently, the relationsh...