# Test1Sm08 - 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 – SUMMER 2008 STUDENT NAME I. A T-beam is made of a 4-inch thick slab and a web of 14 in x 20 in. It has a span of 24 ft and a tributary width of 16 ft. Determine the effective flange width. (2 points) ¼(24' 12 )= 72" Controls! be = 14+16(4) = 78" c-c: 16' 12= 192" ×⇐ × II. Recommend the temperature and shrinkage reinforcement for a 12 inch thick slab (2 points) The temperature and shrinkage reinforcement varies with the steel yield value. Assuming f y = 60 ksi As = 0.0018bh = 0.0018(12)(12) = 0.26 in 2 /ft Using #4 bars (0.20 in 2 ): #4 @ 9” Using #5 bars (0.31 in 2 ): #[email protected] III. For cold weather concreting, would you use admixtures that are retarders or admixtures that are accelerators? (2 points) Accelerators IV. List one advantage and one disadvantage of using compression reinforcement (2 points) Advantage: Ductility Disadvantage: Deflections V. Using the ACI Code and assuming f’ c = 5000 psi and f y = 40,000 psi determine the ratio of steel ( ρ ) permitted to obtain: a) the smallest effective size rectangular beam (1 point) ' 1 max 0.85 0.85*0.80*5 0.003 0.036 40 0.003 0.004 cu yu t f f βε ρ εε ⎛⎞ == = ⎜⎟ ++ ⎝⎠ b) the largest effective size rectangular beam (1 point) min , since f’ c > 4440 psi : ' min 3 3 5000 0.0053 40000 c y f f =

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Test1Sm08 - Closed book exam No notes allowed CE 3213...

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