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A simple beam of Hem Fir, select structural grade, has a span of 18 ft with two concentrated loads of 4,000 lbs. each placed at the third points of the span. Neglect the beam's own weight. a) Compute the maximum bending moment (hint: you can use Figure 3.18 from text). b) Use the tables in Chapter 5 to determine the allowable bending stress (F₁). b c) Assuming F₁ = F' (no correction factors are needed) compute the required section modulus (S). Use this value (and Table A.8) to select the size of the beam with the least cross-sectional area.

A simple beam of Hem Fir, select structural grade, has a span of 18 ft with two concentrated loads of 4,000 lbs. each placed at the third points of the span. Neglect the beam's own weight. a) Compute the maximum bending moment (hint: you can use Figure 3.18 from text). b) Use the tables in Chapter 5 to determine the allowable bending stress (F₁). b c) Assuming F₁ = F' (no correction factors are needed) compute the required section modulus (S). Use this value (and Table A.8) to select the size of the beam with the least cross-sectional area.

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A simple beam of Hem Fir, select structural grade, has a span of 18 ft with two concentrated loads of 4,000 lbs. each placed at the third points of the span. Neglect the beam's own weight. a) Compute the maximum bending moment (hint: you can use Figure 3.18 from text). b) Use the tables in Chapter 5 to determine the allowable bending stress (F₁). b c) Assuming F₁ = F' (no correction factors are needed) compute the required section modulus (S). Use this value (and Table A.8) to select the size of the beam with the least cross-sectional area.
Transcribed Image Text:A simple beam of Hem Fir, select structural grade, has a span of 18 ft with two concentrated loads of 4,000 lbs. each placed at the third points of the span. Neglect the beam's own weight. a) Compute the maximum bending moment (hint: you can use Figure 3.18 from text). b) Use the tables in Chapter 5 to determine the allowable bending stress (F₁). b c) Assuming F₁ = F' (no correction factors are needed) compute the required section modulus (S). Use this value (and Table A.8) to select the size of the beam with the least cross-sectional area.
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