01-01ChapGere.0008

01-01ChapGere.0008 - thick is lifted by four cables...

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Problem 1.2-10 Solve the preceding problem if the load P 5 32 kN; the cable has effective cross-sectional area A 5 481 mm 2 ; the dimensions of the crane are H 5 1.6 m, L 1 5 3.0 m, and L 2 5 1.5 m; and the cable stretches by 5.1 mm. Figure is with Prob. 1.2-9. 8 CHAPTER 1 Tension, Compression, and Shear Solution 1.2-10 Loading crane with girder and cable F REE - BODY DIAGRAM OF GIRDER E QUILIBRIUM T V (3.0 m) 2 (32 kN)(4.5 m) 5 0 T V 5 48 kN 5 90 kN T H 5 (48 kN) ¢ 3.0 1.6 T H 5 T V ¢ 3.0 1.6 T H T V 5 L 1 H 5 3.0 m 1.6 m © M A 5 0 `~ T ENSILE FORCE IN CABLE (a) A VERAGE TENSILE STRESS IN CABLE (b) A VERAGE STRAIN IN CABLE L 5 length of cable d 5 stretch of cable d 5 5.1 mm e 5 d L 5 5.1 mm 3.4 m 5 1500 3 10 2 6 L 5 Ï H 2 1 L 1 2 5 3.4 m s 5 T A 5 102 kN 481 mm 2 5 212 MPa 5 102 kN T 5 Ï T H 2 1 T V 2 5 Ï (90 kN) 2 1 (48 kN) 2 D H C P = 32 kN B A L 2 L 1 C B A 3.0 m 1.5 m T H T T V P = 32 kN T = tensile force in cable Problem 1.2-11 A reinforced concrete slab 8.0 ft square and 9.0 in.
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Unformatted text preview: thick is lifted by four cables attached to the corners, as shown in the figure. The cables are attached to a hook at a point 5.0 ft above the top of the slab. Each cable has an effective cross-sectional area A 5 0.12 in 2 . Determine the tensile stress s t in the cables due to the weight of the concrete slab. (See Table H-1, Appendix H, for the weight density of reinforced concrete.) Cables Reinforced concrete slab H 5 1.6 m L 1 5 3.0 m L 2 5 1.5 m A 5 effective area of cable A 5 481 mm 2 P 5 32 kN A-PDF Split DEMO : Purchase from www.A-PDF.com to remove the watermark...
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