Short-Term Deflection in Two-Way Reinforced Concrete Slabs After Cracking


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Title: Short-Term Deflection in Two-Way Reinforced Concrete Slabs After Cracking

Author(s): S. N. Shukla and M. K. Mittal

Publication: Journal Proceedings

Volume: 73

Issue: 7

Appears on pages(s): 416-419

Keywords: concrete slabs; cracking (fracturing): deflection;loads (forces) : reinforced concrete; structural analysis;two-way slabs.

Date: 7/1/1976

Use of the ultimate strength methad of design with high strength concrete and reinforcing steels poses serviceability problems in modern structures. Excessive cracking and deflection may occur in slabs designed by the new methods such as the yield-line and the strip methods, since the percentage of reinforcement in such slabs is comparatively low. This calls for design criteria to control cracking and deflection. The codes do permit some values of crack width which are tolerable. However, an exact theoretical value of deflection in a cracked slab is difficult to calculate. The present paper makes an attempt to derive and present an empirical formula for deflection in slabs which have cracked, based on experimental values obtained in a series of tests on slabs.