Securing a 3D Frame: How to Analyze and Solve for Loads?

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The discussion revolves around a 3D analysis of a frame subjected to loads from multiple directions, highlighting the inadequacy of a 2D analysis. The user struggled with incorporating the third dimension into their calculations, particularly for lateral 2G loads, and sought guidance on converting their initial equations. After some frustration with the lack of responses and attempts to solve the problem, they realized that adding the third direction to their moment equation was the key to finding a solution. Ultimately, the user successfully resolved their issue and expressed appreciation for the eventual clarity gained from the discussion. The thread concludes with a request to close the forum due to the resolution of their problem.
epheterson
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Hey all,
I'm working on an experiment and we have a frame which will be exposed to loads in all directions. I'm trying to analyze how to best secure it and am having trouble considering the 3D analysis, while the 2D analysis seems rather simple to me. I was informed the 2D analysis is insufficient, though, and must consider 3D. I believe when I enter the 3rd dimension I introduce a statically indeterminate system.
I've attached my FBD's and initial 2D equations, could you please guide me in making these 3D. The lateral 2G load especially needs to be considered in 3D. I've created the vectors necessary, but can't find a valid solution. My moment equation was about the CG and included only these two cables, when I tried to solve with my TI-89 titanium it said false :frown:.

r4_=[39,12,3] inches (vector from CG to T4 connection)
r5_=[-21,12,3] inches (vector from CG to T5 connection)
T4_=T4*[-.98,.098,-.172]
T5_=T5*[.98,.098,-.172]

I'll be putting this together in Abaqus while waiting for your comments. Halp!
 

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  • Floor Attachment Analysis.pdf
    Floor Attachment Analysis.pdf
    1.4 MB · Views: 407
  • photo (4).jpg
    photo (4).jpg
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No takers? It seems like a simple 3D statics problem, I just haven't had statics in a while.
 
Y'all are lame.

 
Dude I need numbers, and 4 is not enough.
 
rcgldr, I don't like you. You don't read. I had already figured out how I was attaching it, and needed magnitudes of the tension in the cables. Both of your posts were useless to me.

The correct answer was to simply add the third direction to my moment equation, I'm done now.

Mod, please close this forum.
 
Sorry, I couldn't download the pdf file the first time I tried, so I was just guessing at what you wanted since no one else responded. I tried and again and was able to see the pdf file, so I understand you question now, but you've already solved it.
 
It's cool I appreciate your comments. I've never seen this board so mute with such a simple question. Probably a TL;DR situation.
 

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