4486 - BOND SPLITTING STRENGTH OF RC MEMBERS BASED ON LOCAL BOND STRESS AND SLIP BEHAVIOR

This research presents a proposal of predicting formulas for bond splitting strength of RC members in case of no lateral reinforcement. The purpose of this study is to derive a simple calculation formula for bond splitting strength keeping the mechanical meaning considerations. Making the area of the equivalent bond stress block (EBSB) same as one of local bond stress versus slippage of reinforcement relationship proposed by the authors, the prediction formula for bond splitting strength is simply built. Assuming that bond stress is a constant value, strain and slippage of reinforcement are obtained from solving a simple differential equation. A new prediction formula is expressed separately in case of longer bond length than effective bond length and shorter bond length. The predicted bond splitting strengths show a good agreement with experimental results observed in previous studies.