CYCLIC TESTS ON HIGH-STRENGTH PRESTRESSED CONCRETE FRAMES

Results from small-scale models of eight high-strength prestressed con crete frames, tested under various displacement histories simulating e arthquake forces are presented. The primary curves (horizontal force-d isplacement relationships) and the hysteretic loops are determined exp erimentally. Concrete strength is approximately between 50 and 60 mPa, and effective prestress is 50% of the ultimate strength of the prestr essing steel. It is found that the effect of displacement history on t he mechanical behavior is significant because the entire shape of the hysteretic loops is different and the prestressed concrete frames made of high-strength concrete with a slump of 25 cm may have al least a d uctility factor of 8.0.