A box beam is constructed of four wood boards as shown in the figure part (a). The webs are h = 8 in.,t =1 in. and the flanges are b = 6 in., t = 1 in. boards (actual dimensions), joined screws for which the allowable load in shear is F = 280 Ib per screw. Flange Flange Web Web hi hi -- b - (а) (b) (a) Calculate the maximum permissible longitudinal spacing smax of the screws if the shear force V is 1,200 lb. Round your answer to two decimal places. Smax 5.08 in. (b) Repeat (a) if the flanges are attached to the webs using a horizontal arrangement of screws as shown in the figure part (b). Round your answer to two decimal places. Smax = 4.63 O in.
A box beam is constructed of four wood boards as shown in the figure part (a). The webs are h = 8 in.,t =1 in. and the flanges are b = 6 in., t = 1 in. boards (actual dimensions), joined screws for which the allowable load in shear is F = 280 Ib per screw. Flange Flange Web Web hi hi -- b - (а) (b) (a) Calculate the maximum permissible longitudinal spacing smax of the screws if the shear force V is 1,200 lb. Round your answer to two decimal places. Smax 5.08 in. (b) Repeat (a) if the flanges are attached to the webs using a horizontal arrangement of screws as shown in the figure part (b). Round your answer to two decimal places. Smax = 4.63 O in.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A box beam is constructed of four wood boards as shown in the figure part (a). The webs are , and the flanges are , boards (actual dimensions), joined by screws for which the allowable load in shear is per screw.
Transcribed Image Text:A box beam is constructed of four wood boards as shown in the figure part (a). The webs are h = 8 in.,t =1 in. and the flanges are b = 6 in., t = 1 in. boards (actual dimensions), joined by
screws for which the allowable load in shear is F = 280 lb per screw.
Flange
Flange
Web T
Web
hi
hi
b - -
(а)
(b)
(a) Calculate the maximum permissible longitudinal spacing Smax of the screws if the shear force V is 1,200 lb. Round your answer to two decimal places.
Smax
in.
5.08
(b) Repeat (a) if the flanges are attached to the webs using a horizontal arrangement of screws as shown in the figure part (b). Round your answer to two decimal places.
Smax = 4.63
® in.
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