Question

Qu estion 1: (25 points) The beam shown below has a span of 13 ft and is reinforced with bars that ext end 8 inch beyond the face of the support. The centerline of the longitudinal bars nearest the side ace (i.e., the "outside bars") is 3.5 inch from, the side face as shown below. The concrete has a compressive strength of 3.0 ksi, and the reinforcement is Grade 60. The beam is loaded with a distributed live load (w) of 5.75 k/ft in addition to its own self weight. The unit weight for the reinforced concrete is 150 pcf, Answer the following questions: 1) (6 points) Determine the maximum factored moment (M.) for the beam and the maximum factored shear (Vi) at the centerline of the support. 2) (1 points) Determine e 3) (5 points) Case 1: Assume the bars are eight #5. a. b. c. Determine the development length of the bar. Determine фМп for the beam. Is the beam's strength adequate? Is the bar size adequate for development length? 4) (5 points) Case 2: Assume the bars are four #7 a. Determine the development length of the bar. b. Determine фМ, for the beam. Is the beam's strength adequate? c. Is the bar size adequate for development length? 5) (5 points) Case 3: Assume the bars are two #10. a. b. c. Determine the development length of the bar Determine фМ for the beam, is the beam's strength adequate? Is the bar size adequate for development length? 6) (3 points) Which of the three bar sizes should be selected? Explain the reason for your selection -#4 Stirrup 21 inch Spaced at 9 inch 3 inch 12" square column (typ.) 3.5 inch Face of the support 16 inch 13 feet Cross Section Side Vieww

Answer 1

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