TY - JOUR
T1 - Analytical model for the bond stress-slip relationship of deformed bars in normal strength concrete
AU - Lin, Hongwei
AU - Zhao, Yuxi
AU - Ozbolt, Josko
AU - Feng, Peng
AU - Jiang, Cheng
AU - Eligehausen, Rolf
PY - 2019
Y1 - 2019
N2 - The lateral confinement provided by concrete cover and stirrups has a significant influence on the bond behavior of reinforcing bars. This paper presents a systematical study on the local bond stress-slip behavior of deformed steel bars based on test results of beam-end specimens and test data reported in the literature. The bond-slip mechanism is discussed in detail and a parameter K representing the confining ability of concrete cover and stirrups is proposed. Through parameter K the bond failure mode can be predicted. With K as the governing parameter, a mathematical model for peak slip is proposed. The proposed model enables a smooth transition from splitting failure to pull-out failure. Furthermore, the nonlinear characteristics of bond stress-slip curves under splitting failure mode, which has not been well recognized in previous studies, are thoroughly discussed. By dividing the post-peak bond stress into two components, a mechanism-based mathematical model for the nonlinear descending branch of bond-slip curves is formulated. Finally, a bond-slip model for deformed steel bars is proposed, which is applicable for both splitting failure and pull-out failure modes. Comparisons with experimental results available in the literature show that the proposed model can provide good predictions for the bond-slip behavior of deformed steel bars with varying confinement levels.
AB - The lateral confinement provided by concrete cover and stirrups has a significant influence on the bond behavior of reinforcing bars. This paper presents a systematical study on the local bond stress-slip behavior of deformed steel bars based on test results of beam-end specimens and test data reported in the literature. The bond-slip mechanism is discussed in detail and a parameter K representing the confining ability of concrete cover and stirrups is proposed. Through parameter K the bond failure mode can be predicted. With K as the governing parameter, a mathematical model for peak slip is proposed. The proposed model enables a smooth transition from splitting failure to pull-out failure. Furthermore, the nonlinear characteristics of bond stress-slip curves under splitting failure mode, which has not been well recognized in previous studies, are thoroughly discussed. By dividing the post-peak bond stress into two components, a mechanism-based mathematical model for the nonlinear descending branch of bond-slip curves is formulated. Finally, a bond-slip model for deformed steel bars is proposed, which is applicable for both splitting failure and pull-out failure modes. Comparisons with experimental results available in the literature show that the proposed model can provide good predictions for the bond-slip behavior of deformed steel bars with varying confinement levels.
UR - https://hdl.handle.net/1959.7/uws:62066
U2 - 10.1016/j.conbuildmat.2018.11.258
DO - 10.1016/j.conbuildmat.2018.11.258
M3 - Article
SN - 0950-0618
VL - 198
SP - 570
EP - 586
JO - Construction and Building Materials
JF - Construction and Building Materials
ER -