5.11-5 A box beam is constructed of four wood boards as shown in the figure part a. The webs are 200 mm x 25 mm and the flanges are 150 mm x 25 mm boards (actual dimensions), joined by screws for which the allowable load in shear is F=1.1 kN per screw. (a) Calculate the maximum permissible longitudinal spacing smax of the screws if the shear force Vis 5.3 kN. (b) Repeat part (a) if the flanges are attached to the webs using a horizontal arrangement of screws as shown in the figure part b. ТУ Flange Flange Web 25 mm 25 mm Web 200 mm 200 mm 25 mm 25 mm 25 mm 25 mm 150 mm- 150 mm 25 mm 25 mm (a) PROBLEM 5.11-5 (b)

5.11-5 A box beam is constructed of four wood boards as shown in the figure part a. The webs are 200 mm x 25 mm and the flanges are 150 mm x 25 mm boards (actual dimensions), joined by screws for which the allowable load in shear is F=1.1 kN per screw. (a) Calculate the maximum permissible longitudinal spacing smax of the screws if the shear force Vis 5.3 kN. (b) Repeat part (a) if the flanges are attached to the webs using a horizontal arrangement of screws as shown in the figure part b. ТУ Flange Flange Web 25 mm 25 mm Web 200 mm 200 mm 25 mm 25 mm 25 mm 25 mm 150 mm- 150 mm 25 mm 25 mm (a) PROBLEM 5.11-5 (b)

Steel Design (Activate Learning with these NEW titles from Engineering!)

6th Edition

ISBN:9781337094740

Author:Segui, William T.

Publisher:Segui, William T.

Chapter10: Plate Girders

Section: Chapter Questions

Problem 10.7.8P

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A W1422 acts compositely with a 4-inch-thick floor slab whose effective width b is 90 inches. The beams are spaced at 7 feet 6 inches, and the span length is 30 feet. The superimposed loads are as follows: construction load = 20 psf, partition load = 10 psf, weight of ceiling and light fixtures = 5 psf, and live load = 60 psf, A992 steel is used, and fc=4 ksi. Determine whether the flexural strength is adequate. a. Use LRFD. b. Use ASD.
A beam is part of the framing system for the floor of an office building. The floor is subjected to both dead loads and live loads. The maximum moment caused by the service dead load is 45 ft-kips, and the maximum moment for the service live load is 63 ft-kips (these moments occur at the same location on the beam and can therefore be combined). a. If load and resistance factor design is used, determine the maximum factored bending moment (required moment strength). What is the controlling AISC load combination? b. What is the required nominal moment strength for a resistance factor of 0.90? c. If allowable strength design is used, determine the required moment strength. What is the controlling AISC lead combination? d. What is the required nominal moment strength for a safety factor of 1.67?
Determine the smallest value of yield stress Fy, for which a W-, M-, or S-shape from Part 1 of the Manual will become slender. To which shapes does this value apply? What conclusion can you draw from your answer?
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