ANYTHING ELSE must mee
the alternative design specifications & be signed off by a PE as meeting
the
alternative design criteria.
I appreciate you and everyone else trying to help here Jay. I'm trying to
understand what the GCR means with this:
(Start GCR 9.4.5)
C. Roll Cage Bracing
"1. The main hoop must have two forward braces extending from the hoop and
attached to the frame, monocoque, or front hoop. Braces must be attached
as near as possible to the top of the hoop but must not be more than six (6)
inches below the top and at an included angle of at least thirty (30)
degrees.
***---If these braces do not extend to the front hoop, an additional brace
or gusset (14 gauge - .078" minimum thickness) must be installed between the
lower frame rail and the upper frame rail at the point of attachment of the
forward hoop brace. If these braces do not extend to the front hoop, an
additional brace or gusset must be installed at the point of attachment to
the main rear hoop or lower frame rail or other major frame member in such a
manner as to reinforce the attachment point to help prevent collapse of the
frame rail at the point of attachment.---***
These tubes shall be 1" x .080" minimum and gussets shall be 14 gauge -
.078" minimum thickness. "
(End GCR)
My reading of this (GCR 9.4.5) suggests that there is a way to legally build
bracing that doesn't go all the way to the front, and I see no indication
that the structure needs to be analyzed by an engineer. To my mind this is
just a matter of understanding the language correctly and following the
instruction. It's not rocket science. I'm convinced that we can figure this
out without a degree in Law, Engineering, or English.
Anyways, based on the thrashing around that we've done, I think I am
beginning to understand more clearly. I'll try to put it in terms that are
less easily confused, and then we'll see what you all think.
(Start GCR 9.4.5)
"If these braces do not extend to the front hoop, an additional brace or
gusset (14 gauge - .078" minimum thickness) must be installed between the
lower frame rail and the upper frame rail at the point of attachment of the
forward hoop brace."
(End GCR)
In plain English, this means I can put in a brace that doesn't go all the
way to the front hoop, but I need to put an extra and diagonal braces
between the upper and lower frame rails that act as supports for the front
hoop. The arrangement will look like a " Z" where the top and bottom of
the "Z" are the upper and lower frame rails and the diagonal support
attaches to the top frame rail and the front roll hoop at the forward end,
and to the bottom frame rail at the back end.
(Start GCR 9.4.5)
"If these braces do not extend to the front hoop, an additional brace or
gusset must be installed at the point of attachment to the main rear hoop
or lower frame rail or other major frame member in such a manner as to
reinforce the attachment point to help prevent collapse of the frame rail at
the point of attachment."
(End GCR)
I need to put in extra supports (braces) to stop the frame from folding up
at the point where the brace (that doesn't go all the way to the front)
attaches to the frame. A support like that will run to the bottom frame
rail.
There. I think I've got it.
JV
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