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2 cards from this section. Quick, good the night before a test.
What is the sum of vertical forces in a static truss?
Think about forces acting up versus acting down.
Define static determinacy.
How many equations do we use?
What does the equation ∑F_x = 0 represent in truss analysis?
Think about which forces are acting in the horizontal direction.
A truss is statically indeterminate if:
Review the conditions for determinate vs. indeterminate.
A truss has 8 members, 4 joints, and 3 reactions. Is it stable? Justify your answer using the appropriate relationship.
Apply the m + R < 2j condition.
In a truss analysis, if the internal force in a member returns negative, what does it imply? Provide an example.
Think back to the sign convention!
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