Title:
Bond Behavior of Plain Round Bars in Concrete under Complex Lateral Pressures (with Appendix)
Author(s):
Feng Xu, Zhi-min Wu, Jian-jun Zheng, Yu Hu, and Qing-bin Li
Publication:
Structural Journal
Volume:
111
Issue:
1
Appears on pages(s):
15-26
Keywords:
bond stress-slip curve; complex lateral pressure; plain round bar
DOI:
10.14359/51686427
Date:
1/1/2014
Abstract:
The bond behavior of reinforcing bars is highly dependent on confinement conditions and is of great importance in the design and analysis of concrete structures. This paper presents an experimental investigation into the bond behavior of plain round bars subjected to uniaxial and biaxial lateral pressures with different pressure ratios. The bond parameters are analyzed with respect to the average lateral pressure. The results show that the residual and ultimate bond strengths increase with the increase of the average lateral pressure, but their ratio stays invariable. The slip at the ultimate bond stress first reduces remarkably, and then increases gradually with an increase in lateral pressure. Compared with lateral pressure, the bar size and the strength of concrete have little influence on the bond strength ratio. Finally, a constitutive model of bond stress-slip with the lateral pressure effect is presented and shown to correlate well with the experimental data for different pressure ratios and levels.