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Unformatted text preview: the design is complete with A s =A s1 +A s2 and A s ’ as computed in step (iii). (v) If A s ’ does not yield at failure, select actual bar sizes for A s ’ and check with the quadratic equation to compute the distance to the neutral axis c , the stress f s ’ , and the required value of A s ’ from M n ’=A s ’(f s ’.85f c ’)(dd’). If the required value of A s ’ is less than the actually provided value then the design is conservatively completed. 2. A beam has the same material properties and loading as in Problem 1. However, the effective depth of the beam is limited to d =21 in. due to architectural considerations. The width of the beam is increased to b =16 in. to improve the beam strength at the reduced effective depth. Design the flexural reinforcement for this beam at the tension controlled limit of ε t =0.005 as in Problem 1. Specify bar sizes to provide the required A s ’ and A s ....
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 Spring '09
 effective depth, flexural reinforcement, rectangular concrete beam

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