Lecture-3

# Lecture-3 - determinate and indeterminate • Assumption...

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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
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? – What’s 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...

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