Flashcards
Frames w/Lateral Loads
Flashcards do conjunto (8)
- 1Where is the zero force member in a 3 member joint? Analogy?If no external load, the member that is not co linear is zero force.
Its the I in the T. - 2Given a laterally loaded frame of Width = 4m and H = 3m, which method of Approx. Analysis would be used, why and what assumptions?As ratio is <2 it is low elevation. Shear is key in short beams so use Portal Method.
Assume; - Hinge at centre of beams and columns
- Shear is double on internal columns - 3First step for Portal Method when initially analysing a laterally loaded frames 'floor' section? So, for the next floor?Sum Fx to find initial Shear Reaction.
Repeat on next floor. - 4(Portal) When analysing lower floors, what are the Shear forces resisting?The sum of P's on all floors above.
- 5Which method? First Step? General Procedure?Cantilever Method
1st: Find the Centroid of the frame.
2nd: Take M about centroid, find verticals in terms of 1st Column, Solve for Ay, then statics.
- 6Cantilever Method Assumptions?Hinges in Beams/Columns
Force is proportional to distance from Centroid - 7How find Centroid? (Formula)where x is distance from x=0
- 8Key difference in 1st assumption between Portal and Cantilever Methods?Portal assumes to find Fx
Cantilever assumes to find Fy
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- Frames w/Lateral Load
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- Jonathan Griffin
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