In order to make clear the bond splitting behavior of reinforced concrete members with high strength concrete, eighteen simply supported beam tests were carried out. But comparing the tests results with the existing design equation, the following remarks were obtained : (1) Bond strength is inversely proportional to the bond length for the case of having no transverse reinforcements. (2) The use of transverse reinforcements, especially of supplement ties is more effective for the high strength concrete. (3) The greater concrete strength is, the smaller the bond strength difference between top bar and bottom bar is. Furthermore, the new experimental equation considering these remarks was proposed on the basis of Fujii-Morita's equation. The applicability of this proposal was verified by the latest Japanese invpstigator's toct reciiits.
