抄録
A method is proposed to estimate the required length of double-layered flexural reinforcing bars for reinforced concrete (RC) beams. This research deals with deep beams in which the shear reaction is dominant and the plastic hinge is not formed. The ACI (American Concrete Institute) and AIJ (Architectural Institute of Japan) guidelines propose several methods to determine the cut-off length of double-layered bars for typical foundation beams. However the theoretical and experimental bases are not yet presented. A series of experimental works was conducted to measure the bond strength of double-layered bars. A method to estimate the double-layered length and the shear strength of beams with small shear span-to-depth ratio is then developed based on the concept of the partial truss mechanism.
