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Trusses_MOJ_MethodOfJoints

Trusses_MOJ_MethodOfJoints - 5 Replace the members with...

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Trusses – MOJ (Method of Joints) 1. Draw a Free Body Diagram (FBD) a. Draw your reference frame; axes and indication of the direction for a positive moment. b. Ignore the internal structure. c. Replace all of the points of contact with the outside world with reaction forces (see Table 4-1, page 142). d. Draw all of the applied forces and moments. Note: A distributed load may be concentrated at its centroid. e. Include all dimensions and angles. 2. Apply the equilibrium equations 0 = ∑ x F 0 = ∑ y F 0 = ∑ P M 3. Solve for the unknowns (reaction forces). 4. Select a joint with no more than 2 members (because you can only have 2 unknowns).
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Unformatted text preview: 5. Replace the members with forces; assume the members are in tension , and that they are 2-force members (forces only applied at the ends of the members). 6. Remember to include any applied forces or reaction forces at that joint. 7. Apply the equilibrium equations to solve for the unknown forces, = ∑ x F = ∑ y F 8. Move to an adjacent joint that has no more than 2 unknown forces/members. 9. Repeat students 5 – 8 as needed....
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