Span-Depth Ratios for One-Way Members Based on ACI 318 Deflection Limits

Span-depth ratio (l/h) expressions are developed for steel-reinforcedconcrete one-way slabs and beams to satisfy deflection control andflexural strength requirements. The expressions are presented asfunctions of reinforcement ratio and specified deflection-to-span limit.A comparative study is performed to evaluate the effects of effectivemoment of inertia, shrinkage restraint, construction loads,sustained live load, long-time deflection multiplier, supportconditions, and deflection limits on the resulting span-depth ratios.A comparison is also made with minimum thickness valuesprescribed by ACI 318 that are a function of span and supportconditions only. Effects of various input parameters are consideredin examples involving a simply supported rectangular beam and aninterior span of a continuous one-way slab. The results of the studyindicate some of the limitations associated with the ACI 318minimum thickness requirements.

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Span-Depth Ratios for One-Way Members Based on ACI 318 Deflection Limits
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