Crack Width Control in Reinforced Concrete Two-Way Slabs

by Edward G. Nawy, (F.ASCE), Prof. of Civ. Engrg.; Rutgers Univ., New Brunswick, NJ,
Glenn S. Orenstein, (A.M.ASCE), Engr.; U.S. Army Waterways Experiment Stn., Vicksburg, MS,

Serial Information: Journal of the Structural Division, 1970, Vol. 96, Issue 3, Pg. 701-721

Document Type: Journal Paper


This investigation covers the effect of two-way action on crack width development in both centrally loaded and uniformly loaded slab systems of varied boundary conditions. As a result, criterion is developed whereby more but narrower flexural cracks of orthogonal pattern can be precipitated, thereby control of crack width development in two-way concrete floor slabs. A cracking hypothesis is presented and verified by tests on 22 centrally loaded slabs 5 ft 8 in. x 5 ft 8 in., and 32 uniformly loaded slabs 5 ft 0 in. x 5 ft 0 in. The size and spacing of the wire reinforcement are varied to extremes. A grid index is proposed as a measure of crack control in two-way slabs under different boundary as well as loading conditions.

Subject Headings: Cracking | Load factors | Reinforced concrete | Load tests | Boundary conditions | Flexural strength | Concrete slabs | Floors

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