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 s allow 5 15,000 psi, L 5 24 ft, P 5 2000 lb, and q 5 400 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 qq L 4 L 4 L 4 L 4 P 5 2000 lb q 5 400 lb/ft L 5 24 ft s allow 5 15,000 psi R EQUIRED SECTION MODULUS 5 19,200 lb-ft 5 230,400 lb-in. S 5 M max s allow 5 230,400 lb-in. 15,000 psi 5 15.36 in. 3 M max 5 PL 4 1 qL 2 32 5 12,000 lb-ft 1 7,200 lb-ft T RIAL SECTION S 10 3 25.4 S 5 24.7 in. 3 q 0 5 25.4 lb/ft M max 5 230,400 1 21,950 5 252,300 lb-in. Required . 16.8 in. 3 , 24.7 in. 3 [ Beam is satisfactory. Use S 10 3 25.4 S 5 M max s allow 5 252,300 lb-in. 15,000 psi 5 16.8 in. 3 M 0 5 q 0 L 2 8 5 1829 lb-ft 5 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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This note was uploaded on 09/20/2009 for the course COE 3001 taught by Professor Armanios during the Spring '08 term at Georgia Tech.

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