Analytical Model for Bar Slip and Pullout Capacity of Straight Bars

ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

  


Title: Analytical Model for Bar Slip and Pullout Capacity of Straight Bars

Author(s): Juan Murcia-Delso and Ghassan Fawaz

Publication: Structural Journal

Volume: 116

Issue: 5

Appears on pages(s): 137-149

Keywords: bar pullout; bar slip; bond stress; development length; reinforcing bar; reinforced concrete; strain penetration

Date: 9/1/2019

Abstract:
This paper presents an analytical model to determine the bar slip and pullout capacity of straight bars embedded in well-confined concrete. The model provides a closed-form solution of the slip experienced at the loaded end of a bar, which can be used to compute the end rotation of flexural members. The slip equations are obtained from the strain penetration resulting from a set of predefined bond stress distributions along the embedment length of a bar. For bars with relatively short lengths, the slip at the unloaded end is also considered. Additionally, the model can inform the pullout capacity of a bar. Its accuracy in predicting the loaded-end slip, strains distributions, and pullout strength has been verified with experimental data. Model predictions have been also compared with results obtained with two similar models available in the literature. Finally, the model has been used to determine the base rotations and lateral displacements of hinging columns.