Lecture 32 sect 6.9 - ME 221 Statics Lecture#32 Section 6.9...

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ME221 Lecture #32 1 ME 221 Statics Lecture #32 Section 6.9
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ME221 Lecture #32 2 Homework #11 Chapter 6 problems: 2, 3, 6 & 7 – Method of Joints 32, 36, 47 & 53 – Method of Sections 68 & 75 Due Friday, November 21
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ME221 Lecture #32 3 Quiz #7 Friday, November 21 Analysis of Structures Method of Joints or Method of Sections
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ME221 Lecture #32 4 Analysis of Trusses Using the Method of Joints A y A x C y A B C α β We need to solve for: (1) - Internal forces F AB , F AC , and F BC (2) - Reactions A x , A y and C y
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ME221 Lecture #32 5 6 kN 3 kN E B A C D 4 4 16 16 4 4 9 9 15 15 5 5
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ME221 Lecture #32 6 1.8 m 12 kN 12 kN 4 @ 2.4 m=9.6 m B D F H J A C E G I Method of Sectioning If the question is to find internal forces in selected members of the truss, then one can alternatively use the method of sectioning. Example: Determine the force in members FG and FH
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ME221 Lecture #32 7 1.8 m 12 kN 12 kN B D F H J A C E G I F GE F GF F HF 1.8 m 12 kN 12 kN B D F H J A C E G I F EG F FG F EH = = = 0 0 0 Anypt y x M F F
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ME221 Lecture #32 8 Frames Are designed to support,
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