Prob 4_7c

# Prob 4_7c - 2 n F L V L V = --= =- ( 29 ( 29 cos 45 2 cos...

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4/7. Determine the force in member AC of the loaded truss. The two quarter- circular members act as two-force members

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B C Question: what is different between having a pinned curved member B C versus a straight member? r r r r 2 L 2 L 2 L 2 L
answer: for the straight member the internal force carried by the member is just a constant axial (compressive) force anywhere in the member B C r r B C make cut P P P 2 L 2 L 2 L 2 L 2 L 2 L

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B C r r the curved member must have internal forces and couples that vary in the member C r V shear force axial force F bending moment M n t O O 450 + + + B M V F vertical component P P P make cut 2 L 2 L 2 L θ 45 - ( 29 ( 29 0 sin 45 0 2 sin 45
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Unformatted text preview: 2 n F L V L V = --= =- ( 29 ( 29 cos 45 2 cos 45 2 t F L F L F = +-= = -- ( 29 2 2 2 2 cos 45 2 2 O M L r Fr M rL M = + + = =-- 2 L 10 20 30 40 50 60 70 80 90-1-0.6-0.2 0.2 0.6 1 axial force shear force bending moment 10 20 30 40 50 60 70 80 90 0.1 0.2 0.3 C r O O V F M 10 20 30 40 50 60 70 80 90-1-0.8-0.6-0.4-0.2 / 2 F L / 2 V L / 2 M rL 2 L...
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## This note was uploaded on 10/17/2011 for the course EM 274 taught by Professor Boylan during the Fall '08 term at Iowa State.

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Prob 4_7c - 2 n F L V L V = --= =- ( 29 ( 29 cos 45 2 cos...

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