Frames w/Lateral Loads

Jonathan Griffin
Flashcards by Jonathan Griffin, updated 7 months ago More Less
Jonathan Griffin
Created by Jonathan Griffin over 1 year ago


Frames w/Lateral Load

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Question Answer
Where 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.
Given 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
First 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.
(Portal) When analysing lower floors, what are the Shear forces resisting? The sum of P's on all floors above.
Which method? First Step? General Procedure? Cantilever+1 (binary/octet-stream) 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. Cantilever+2 (binary/octet-stream)
Cantilever Method Assumptions? Hinges in Beams/Columns Force is proportional to distance from Centroid
How find Centroid? (Formula) where x is distance from x=0 Centroid (binary/octet-stream)
Key difference in 1st assumption between Portal and Cantilever Methods? Portal assumes to find Fx Cantilever assumes to find Fy
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