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Trusses_MOS_MethodOfSections - 5 Replace the cut members...

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Trusses – MOS (Method of Sections) 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. Cut the truss so that all (or most) of the members of interest have been cut.
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Unformatted text preview: 5. Replace the cut 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/moments or reaction forces/moments for the remaining section. 7. Apply the equilibrium equations to solve for the unknown forces, = ∑ x F = ∑ y F = ∑ P M Note: take the moment about the point with the most unknown forces (or line of action of the unknown forces) passing through it. This will minimize the number of unknown forces in the moment equation....
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