14305718
Description
Flashcards by Jonathan Griffin, updated more than 1 year ago
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Created by Jonathan Griffin
over 6 years ago
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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 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 Method Assumptions? | Hinges in Beams/Columns Force is proportional to distance from Centroid |
| How find Centroid? (Formula) | where x is distance from x=0 |
| Key difference in 1st assumption between Portal and Cantilever Methods? | Portal assumes to find Fx Cantilever assumes to find Fy |
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