Size Effects on Bond-Slip of Reinforced Concrete Connections
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When reinforced concrete structure is subjected to earthquake loads, cracks will inevitably appear. A bond-slip occurs where cracks have developed. The influence of the bond-slip is not negligible on the lateral behavior of structures. Researchers have studied the bond-slip for the past four decades. Most studies investigated a relationship of the bond stress-slip experimentally and developed empirical equations. Among them, the equation developed by Ciampi et.al. (1981) has been widely used in design practice. Some earlier studies investigated each failure mode (Debonding or splitting failure) analytically without considering size effects. Other researchers studied the size effects on the bond-slip through experiments only. Design codes (ACI building codes and AASHTO bridge specifications) consider the size effects on the bond-slip by increasing the development length as the size of rebars increases. In this study, the size effects on the bond-slip are explored by analytical model developed herein, which is called SHC (Stacked Hollow Cone) model, in conjunction with CVBCM (Complex Variable Boundary Collocation Method). The governing failure mode and the maximum force with corresponding bond-slip at failure state can be predicted under various geometric conditions by this model. This analytical model provides a better understanding of the size effects on complicated bond-slip problems and predictions of the lateral behavior of a column become more accurate when the bond-slip is considered.