Test108 - Closed book exam. No notes allowed. CE 3213...

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Closed book exam. No notes allowed. CE 3213 REINFORCED CONCRETE DESIGN EXAM I – SPRING 2008 STUDENT NAME I. What is the minimum amount of f’ c for the concrete to be considered structural as defined by the ACI Code.? (2 points) The minimum value is 2,500 psi II. What is the Whitney Compression Block ? (2 points) It is an equivalent rectangular compressive stress distribution. It uses an average stress of ' 0.85 c f uniformly distributed over an equivalent compression zone bounded by edges of the cross section and a straight line located parallel to the neutral axis at a distance 1 β = ac from the fiber of maximum compression strain. III. Give at least two cases where the use of a superplasticizer is recommended? (2 points) For pumping concrete To produce high-strength concrete with w/c ratio of about 0.35 In areas where vibration of the concrete is difficult IV. Using the ACI Code and assuming f’ c = 3000 psi and f y = 60,000 psi determine the steel area permitted to obtain: a) the largest effective size rectangular beam (1 point) ' min 3 3 3000 0.0027 60,000 200 200 0.0033 60,000 c y y f f f ρ ⎧⎫ ⎪⎪ == ⎨⎬ ⎩⎭ min 0.0033 = b) the smallest effective size rectangular beam (1 point) ' 0.85 0.85*0.85*3.0 0.003 1 0.0155 max 60 0.004 min βε εε ⎛⎞ ⎜⎟ = ++ ⎝⎠ f cu f yu t V. What is the difference between
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Test108 - Closed book exam. No notes allowed. CE 3213...

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