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Unformatted text preview: 2 forces constrain 1 point 2n forces constrain n points 2n forces, m from members + 3 from supports Examples. m = 2n  3 n = 3 , m = 3 n = 6 , m=9 m = 2n3 is necessary, not sufficient! C truss not rigid! Simple Trusses Triangle is simplest just rigid planar truss. Simple trusses constructed by adding 2 members , 1 joint to basic triangle. Method of Joints Obtain internal forces in members and support forces. Step 1. Obtain support forces by applying equilibrium to entire truss. Step 2. Obtain internal forces by applying equilibrium to each joint. Special Cases 1. 2. A E B C D AE=AC AD=AB A B C D AC=0 AD=AB more 3. 4. A B C D P AC=P AD=AB A D B AB=0 AD=0...
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This note was uploaded on 04/02/2012 for the course ECS 221 taught by Professor Macnamara during the Fall '08 term at Syracuse.
 Fall '08
 MACNAMARA

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