A box beam is fabricated from two plywood webs that are secured to dimension lumber boards at its top and bottom flanges. The beam supports a concentrated load of P = 4300 Ib at the center of a 15-ft span. Bolts (3/8-in. diameter) connect the plywood webs and the lumber flanges at a spacing of s = 9 in. along the span. Supports A and C can be dealized as a pin and a roller, respectively. w = 5 in., b = 0.5 in., t = 5 in., h = 14 in.]

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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A box beam is fabricated from two plywood webs that are secured to dimension lumber boards at its top and bottom
flanges. The beam supports a concentrated load of P = 4300 lb at the center of a 15-ft span. Bolts (3/8-in. diameter)
connect the plywood webs and the lumber flanges at a spacing of s = 9 in. along the span. Supports A and C can be
idealized as a pin and a roller, respectively.
[w = 5 in., b = 0.5 in., t = 5 in., h = 14 in.]
P
A
В
L/2
L/2
b-k Kb
W
What is the first moment of area (Q) that is needed for the calculation of shear flow in the bolts?
238 in.4
272 in.4
204 in. 4
317 in.4
471 in.4
Transcribed Image Text:A box beam is fabricated from two plywood webs that are secured to dimension lumber boards at its top and bottom flanges. The beam supports a concentrated load of P = 4300 lb at the center of a 15-ft span. Bolts (3/8-in. diameter) connect the plywood webs and the lumber flanges at a spacing of s = 9 in. along the span. Supports A and C can be idealized as a pin and a roller, respectively. [w = 5 in., b = 0.5 in., t = 5 in., h = 14 in.] P A В L/2 L/2 b-k Kb W What is the first moment of area (Q) that is needed for the calculation of shear flow in the bolts? 238 in.4 272 in.4 204 in. 4 317 in.4 471 in.4
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