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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 .

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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# Stabalize a frame with straps

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