05-02ChapGere.0003

# 05-02ChapGere.0003 - 306 A-PDF Stresses in Beams(Basic...

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Problem 5.6-5 A simple beam AB is loaded as shown in the figure on the next page. Calculate the required section modulus S if allow 15,000 psi, L 24 ft, P 2000 lb, and q 400 lb/ft. Then select a suitable I-beam ( S shape) from Table E-2, Appendix E, and recalculate S taking into account the weight of the beam. Select a new beam size if necessary. Solution 5.6-5 Simple beam 306 CHAPTER 5 Stresses in Beams (Basic Topics) A B P q q L 4 L 4 L 4 L 4 P 2000 lb q 400 lb/ft L 24 ft allow 15,000 psi R EQUIRED SECTION MODULUS 19,200 lb-ft 230,400 lb-in. S M max s allow 230,400 lb-in. 15,000 psi 15.36 in. 3 M max PL 4 qL 2 32 12,000 lb-ft 7,200 lb-ft T RIAL SECTION S 10 25.4 S 24.7 in. 3 q 0 25.4 lb/ft M max 230,400 21,950 252,300 lb-in. Required . 16.8 in. 3 24.7 in. 3 Beam is satisfactory. Use S 10 25.4 S M max s allow 252,300 lb-in. 15,000 psi 16.8 in. 3 M 0 q 0 L 2 8 1829 lb-ft 21,950 lb-in. Problem 5.6-6 A pontoon bridge (see figure) is constructed of two longitudinal wood beams, known as
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