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SR Sect Design Proc - Recommended design steps for...

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Recommended design steps for singly-reinforced sections when beam dimensions are not known: Will assume material properties, loads, span lengths and moments are all known. Usually the beam self-weight is not known, but with some experience you should be able to make a good estimate of the section dimensions. The self- weight can be corrected after the final dimensions are established (step 7). 1. Select a reasonable value for ρ , either based on experience or the value suggested in class, 2. Calculate the reinforcement index, ω = ρ f y /f c ' 3. Calculate the coefficient R = f c ' ω (1 - 0.59 ω ) (Reasonable value? ) 4. Calculate the required value of b d 2 = (M u / φ )/R ; assume φ = 0.9 5. For a typical beam, select b as a function of d, i.e., b α d , where 0.4 α 0.7. For some cases where the column width is known, forming costs can be reduced by setting b(beam) = b(column) . 6. Solve for d . a) If beam width, b, is selected as a percentage, α , of the effective depth, d : Round d to a 0.5 in. value to get a whole inch value for h.
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