Title:
Bond-Slip Response of Reinforcing Bars Grouted in Ducts
Author(s):
Dan J. Raynor, Dawn E. Lehman, and John F. Stanton
Publication:
Structural Journal
Volume:
99
Issue:
5
Appears on pages(s):
568-576
Keywords:
bond; duct; reinforcement
DOI:
10.14359/12296
Date:
9/1/2002
Abstract:
This paper addresses the bond behavior of reinforcing bars that are grouted in ducts and subjected to cyclic load. Their behavior has a significant influence on the seismic response of precast concrete frames in which the connections depend on these grouted bars. The critical response quantity is the displacement at the loaded end of the bar caused by inelastic strain penetration into the bonded region. A study was conducted using experimental and analytical methods. In the experimental part of the study, tests were conducted on bars that were grouted over only a short length to develop a constitutive relationship between local bond stress and slip. That relationship was then incorporated into an inelastic, finite element model of the bar. The model was validated by comparing the measured free end displacement of a fully developed bar with the value predicted by analysis. It was then used to conduct a parametric study that extended the investigation beyond the bounds of the matrix of the physical tests. The results of the parametric study were used to develop a simple design equation for predicting the displacement of the loaded end of the bar.