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Unformatted text preview: 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) ....
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This note was uploaded on 03/29/2011 for the course CEE 415 taught by Professor Wight during the Spring '11 term at University of Michigan.
- Spring '11