Lecture-3

Lecture-3 - determinate and indeterminate Assumption: truss...

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Homework rules – make it neat • State the problem-write it out or paste it to your assignment • Single side 8.5”x11” only-engineering paper is good • No spiral bound paper-don’t use ink • Labeled free body diagrams must appear • All force unknowns must appear on the FBD diagrams • When summing forces or moments, always show the positive directions you have chosen • Include your name on each sheet of paper • Staple the problems together AAE 352 3-1
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Peeking inside the structure-structural mechanics is essential AAE 352 3-2 Method of sections Method of joints θ
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There are n simultaneous equations for n unknown forces AAE 352 2-3
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Truss models and idealizations are basic and are divided into
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Unformatted text preview: determinate and indeterminate Assumption: truss is composed of two force members connected at junction points called node points Static determinacy of trusses with 3 external support forces members, m = 2*joints 3 Fewer members a mechanism More members, indeterminate AAE 352 2-4 An example problem to demonstrate the process Draw idealization establish the boundary constraints Draw FBD with external reactions is the truss determinate or indeterminate? Now what do I do? What are you looking for? Whats the cheapest way to get it? AAE 352 2-5 P A B C 20 in. h R 2 P R 3 R 1 A B C...
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Lecture-3 - determinate and indeterminate Assumption: truss...

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