Abstract
Up to date, it is difficult to obtain accurately load-deflection diagrams of reinforced concrete two ways slabs with rigid edge beams. Therefore, in this paper, the approximate method to calculate strength and deflection of a reinforced concrete square slab with a varying compressive membrane force and torsion is proposed by using a similar equation for the square cross-strip slabs (proposed by auther in part 2 of the previous paper) Then, the analisis for four types models is taken, and the tests to confirm accuracy of the equation are carried out and discussed. Consequently, it is sure that load-deflection diagrams of these slabs are calculated in considerable accuracy.
