3. A beam simply supported on a 12-m span carries a uniformly distributed load of 30 kN/m over the middle 6 m. Using an allowable stress of 130 MPa, determine the lightest suitable beam. What is the actual maximum stress in the selected beam? (Shear and moment diagram are optional) 30 kN/m -3m- -3m- Ḥ 6 m

Principles of Foundation Engineering (MindTap Course List)
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Chapter14: Sheet-pile Walls
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3. A beam simply supported on a 12-m span carries a
uniformly distributed load of 30 kN/m over the middle
6 m. Using an allowable stress of 130 MPa, determine
the lightest suitable beam. What is the actual
maximum stress in the selected beam? (Shear and
moment diagram are optional)
30 kN/m
3 m.
6 m
3 m-
Section
Modulus
(x 103 mm³)
3220
3140
3630
3080
Shapes
W610 x 125
W530 138
W610 x 140
W460 x 144
Weight
(kg/m)
125.1
138.3
140.1
144.6
Transcribed Image Text:3. A beam simply supported on a 12-m span carries a uniformly distributed load of 30 kN/m over the middle 6 m. Using an allowable stress of 130 MPa, determine the lightest suitable beam. What is the actual maximum stress in the selected beam? (Shear and moment diagram are optional) 30 kN/m 3 m. 6 m 3 m- Section Modulus (x 103 mm³) 3220 3140 3630 3080 Shapes W610 x 125 W530 138 W610 x 140 W460 x 144 Weight (kg/m) 125.1 138.3 140.1 144.6
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