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ACI 318 - 11: Minimum Thickness of beams and one-way slabs


Values given in this table shall be used directly on members with normalweight concrete and Grade 60 reinforcement. For other conditions, the following modifications should be applied:

  1. For lightweight concrete having equilibrium density, wc, in the range of 90 to 115 lb/ft3, the values should be multiplied by (1.65-0.0005wc) > 1.09.

  2. For fy other than 60,000 psi the values shall be multiplied by (0.4+fy/100,000).

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