Abstract
This is the report of the experiments on reinforced concrete columns' the outline of which was reported in Part 1. The strain distribution of main bars and concrete, the bond stress and the bond slip distribution and the relationships between the bond stress and the bond slip are shown and discussed in comparison with the crack patterns and deflections. The results obtained are as follows, 1. At the maximum load the compressive strain of the top bar of the critical section decreased and the tensile strain zone became longer at the top bar than the bottom one. 2. The compressive strain of the concrete near the top bar increased. The tendency of the strain distribution of the concrete and the crack patterns and deflections were found to be the same. 3. The distribution of the bond stress corresponding to Fig. 14-7-A at the initiation of the positive load varied at some places as shown in Fig. 14-7-B. 4. The bond slip was larger at the tension zone especially near the zone of contraflexure. At the compression zone the bond slip increased gradually on the top bar than the bottom bar. 5. The bond slip measured directly and the one calculated from the strain distribution were almost consistent except the tension crack zone. The bond stress-bond slip relationships at the top were different from the same relationships at the bottom.
