Comparison of PAJS with Regular PCaPC Method
About regular PCaPC method, Tendons are tensioned to 80-90% of their nominal yield point stress. Consequently, the tendons have not spare capacity for non-deterministic forces such as seismic or accidental impact loads.
When gaps are generated, the contact area is reduced and consequently the beams may slip down and produce damages in the members and failure of tendons as well. This system has no corbels and it has the chance to occur a gap at joint during an earthquake. Loss of friction causes great damages on the ability to absorb earthquake energy.
PAJS includes primary and secondary prestressing tendons and beams-supporting corbels. This system allows rotations at joints, protects the floors against falling, and avoids permanent gaps between beam-column connections. Beam-column connections behave as a rigid joint under gravity loads and earthquake Level 5 (moderate earthquake, 50-year return period) and the interfaces remain in compressive state, i.e. no tensions are present in the components. Beam-column connections rotate elastically under gravity loads and earthquakes Level 6 (heavy earthquake, 500-years return period), and Level 7 (extra heavy earthquake, 1000-years return period).