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Each configuration is worth 2 pts. For Each configuration, show

• The unknown forces at each support

• The lines of action of each unknown force (use a highlighter)

• State whether the system is stable or unstable. If unstable state why it is unstable.

• These are 2D systems, so there must a force in each direction to resist movement, AND there must be a moment to resist rotation. The moment can also be in the form of a force couple.

Example

2) This system is STABLE. Ay or Cy resist movement in y-direction Cx resist movement in x-direction

The Force Couple

Determine the Reactions of each beam. Show unknown support forces and the Distributed Load Resultant magnitude and location on the loading diagram. Each Problem is 7 pts.

1 (6 pts) determine support reactions 2 (4 pts)

Define a 2-Force member and sketch a Curved member that is a 2-force. 3 (5 pts)

determine support reactions.

Apply the concept of 2-force member to CB

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