Old Exam2

Old Exam2 - The cover distances to the center of the bars...

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North Carolina State University Reinforced Concrete Design CE 327 Spring 2004 Exam II – March 16, 2004 [Closed Book, Notes, and Code. Only a single formula sheet allowed. Attach the formula sheet .] A cantilever reinforced concrete beam has a cross section, as shown. The beam carries a uniform live load of 0.6 k/ft and a uniform dead load of 0.4 k/ft in addition to its self-weight . Assume normal weight concrete with a unit weight of 150 lb/ft 3 . The span of the cantilever beam is 10 ft . Concrete has a compressive strength of 4,500 psi . Steel is of Grade 60 . There are two (2) No. 8 bars at the bottom and four (4) No. 9 bars at the top of the section, as shown. Nominal diameters and cross sectional areas of the bars used are listed in the table below.

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Unformatted text preview: The cover distances to the center of the bars are given in the figure. 1. What is the cracking moment of the section using the transformed area method? [15 points] 2. What is the stress in tension steel under the applied service loads (un-factored dead, self-weight, and live loads)? [25 points] 3. Can the beam carry the ultimate load (factored dead, self-weight, and live loads)? [50 points] 4. Does the beam satisfy the minimum steel and ductility requirements of the ACI code? [10 points] Table 1. Diameters and Cross Sectional Areas of Bars Used Bar Size Diameter (in) Cross-Sectional Area (in 2 ) No. 8 1.000 0.79 No. 9 1.128 1.00 24” 4” 20” 14” 2.5” 2.5” 4 No. 9 2 No. 8...
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This note was uploaded on 05/28/2011 for the course CES 4702 taught by Professor Mirmaran during the Fall '09 term at FIU.

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Old Exam2 - The cover distances to the center of the bars...

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