- Apr 10, 2007
- Fresno, California
Sorry if I made it overly complicated. To give you a simple example of statically indeterminate, imagine a block of concrete hanging by three cables, one attached at each end, and the third at the midpoint. You don't know how much weight each cable is supporting. The middle cable might support the entire weight and the ends are slack, or the ends might carry the load and the middle slack, or any combination in between. That is statically indeterminate.BMCJ, although I really don't have a solid feel for what statically indeterminate means, I do recall the term from Ryerson. I also understand that the more members I add, the greater the complexity of load calculations. That in itself may not be a good reason for having fewer frame members, but ultimately, it would be good to have a pretty firm understanding of what each frame member is doing. And I guess that means statically determining each load value and direction.
What really happens here is that the cables supporting the load may or may not stretch enough to allow the others to share the load more equally. To make the calculations for this, you now need to know how each cable will stretch.
The good news is that if your structure is strong enough without the extra tubes, then the extra tubes will not hurt your strength, they'll just add more weight and maybe a little more strength.