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481_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

# 481_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

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Problem 5.11-12 Two W steel wide-flange beams are bolted together to form a built-up beam as shown in the figure. What is the maximum permissible bolt spacing if the shear force and the allowable load in shear on each bolt is ( Note: Obtain the dimensions and properties of the W shapes from Table E-1(b).) F 13.5 kN V 80 kN s 310 * 74 SECTION 5.12 Beams with Axial Loads 475 Solution 5.11-12 Location of neutral axis (z axis) M OMENT OF INERTIA ABOUT THE NEUTRAL AXIS I 7.786 * 10 8 mm 4 I c I w + A w a h w 2 b 2 d (2) c h w c 310 mm I w 163 * 10 6 mm 4 h w 310 mm F allow 13.5 kN A w 9420 mm 2 V 80 kN W 310 * 74 F IRST MOMENT OF AREA OF FLANGE M AXIMUM ALLOWABLE SPACING OF NAILS ; s max 2F allow I VQ s max 180 mm f VQ I 2 F s Q A w h w 2 Q 1.46 * 10 6 mm 3 W 310
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Unformatted text preview: 74 W 310 74 Beams with Axial Loads When solving the problems for Section 5.12, assume that the bending moments are not affected by the presence of lateral deflections. Problem 5.12-1 While drilling a hole with a brace and bit, you exert a downward force on the handle of the brace (see figure). The diameter of the crank arm is and its lateral offset is Determine the maximum tensile and compressive stresses and , respectively, in the crank. s c s t b 4-7/8 in. d 7/16 in. P 25 lb P = 25 lb d = 7 in. 16 b = 4 7 in. 8 05Ch05.qxd 9/25/08 2:29 PM Page 475...
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