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403_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

# 403_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

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Problem 5.5-8 During construction of a highway bridge, the main girders are cantilevered outward from one pier toward the next (see figure). Each girder has a cantilever length of 48 m and an I-shaped cross section with dimensions shown in the figure. The load on each girder (during construction) is assumed to be 9.5 kN/m, which includes the weight of the girder. Determine the maximum bending stress in a girder due to this load. SECTION 5.5 Normal Stresses in Beams 397 Solution 5.5-8 N UMERICAL DATA I 1.41 * 10 11 mm 4 I 1 12 ( b f ) h 3 1 12 ( b f t w ) [ h 2 ( t f )] 3 L 48 m q 9.5 kN m h 2600 mm b f 620 mm t f 52 mm t w 28 mm s max 101 MPa

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