Behavior of Reinforced Concrete Members Prone to Shear Deformations: Part II—Effect of Interfacial Bond Stress-Slip

An experimental program was conducted at Texas A&M University to evaluate the effect of reinforcement details on the structural performance of reinforced concrete (RC) bent caps where shear was considered to be the dominant action in the load transfer mechanism. This article, the second of two in a series, reports on the behavior of RC members prone to shear deformations, focusing on the effect of interfacial bond stress-slip. Interfacial bond stress-slip between the concrete and longitudinal reinforcement always occurs in reinforced concrete (RC) members. The companion paper showed that the direct application of the Modified Compression Field Theory (MCFT) led to an overestimation of the post-cracking stiffness of the RC bent cap members. The authors hypothesize that this may be attributed to the inadequate representation of bond-slip using tension-stiffening in MCFT. They present a parametric study on the effect of interfacial bond-slip modeling in shear-dominated RC members. Results from the analytical investigation are compared with experimental results on RC bent caps. The authors conclude by proposing a new bond-slip model for RC members prone to shear deformations with lumped longitudinal reinforcement.