5 4 A 14 In 35 6 Cm Standard Pci Double T Simply Supported Beam Is Shown In Figure P5 4 It Has A Span Of 40 Ft 12 2 1 (31.2 KiB) Viewed 69 times
5 4 A 14 In 35 6 Cm Standard Pci Double T Simply Supported Beam Is Shown In Figure P5 4 It Has A Span Of 40 Ft 12 2 2 (19.02 KiB) Viewed 69 times
5.4 A 14 in. (35.6 cm) standard PCI double-T simply supported beam is shown in Figure P5.4. It has a span of 40 ft (12.2 m) and is subjected to a service dead load WSD = 25 psf (1,197 Pa) plus self- weight W, = 31 psf (1,484 Pa) and a service live load W₁ = 45 psf (2,155 Pa). Design the web-shear reinforcement at d from the support and at quarter span by (a) the detailed method and (b) the alternative method, and then compare the two designs. The tendon is harped at midspan. Given data are as follows: fé (precast) = 5,000 psi, lightweight concrete fá = 3,500 psi f(topping) = 3,000 psi, normal weight fp = 270,000 psi, low-relaxation strand -8'-0" (244 cm)- 4'-0" Ac Go Figure P5.4. 14" (36 cm)
fp = 189,000 psi (1,303 MPa) fpe = 156,000 psi (1,076 MPa) Stirrups f, = 60,000 psi (41.8 MPa) Aps = six 2-in. (12.7 mm) dia 7-wire strands e = 8.01 in. (20.3 cm) e₂ = 4.51 in. (11.5 cm) Use d = 10 in. in the solution. The values of the section properties are as follows: Section properties Untopped Topped Ac 306 in.² le 4,508 in. 7,173 in.¹ 10.51 in. 12.40 in. 3.49 in. 3.60 in. 429 in.³ 578 in.³ 1,292 in.³ 1,992 in.³ 56 psf 31 psf Cb C₁ S₂ St WD
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