Question

in a two way slab the lifting of corners occurs due to

Answer 1

in a two way slab the lifting of corners occurs due to torsional Moment On The slab

Answer 2

Torsional Moment

This is a special case under bending moment. IT is actually a corner reinforcement. This is done to lift the corners to prevent the cracks. The slabs are made to slightly meet at the end of each corner. The moment is actually 1/2 (50%) of the 3/4th of the area used for slab mid-span moment. Slab works often use this.