cantilevered stairs (Oct/Nov’94pg80-81)
In the cantilevered stairs described in the October/November 1994 article (pg 80-81) what would be the minimum length of the vertical steel members that are placed along the studs .
In the cantilevered stairs described in the October/November 1994 article (pg 80-81) what would be the minimum length of the vertical steel members that are placed along the studs .
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Replies
Wouldn't that depend on the width of the treads, the anticipated loading and the size thickness and width of the steel? Sounds like an engineering problem to me.
Thanks for your reply. The tread is 3' 1" long, 9 1/2" at the narrowest and 14" at the widest and made of 2" oak. The support is 1/4" thick by 4" steel plate welded to the uprights to make a sort of "T" shape. The uprights are also 1/4" by 4". Does anyone have any knowledge as to how to calculate the length of the uprights?
JB: I would just error on the side of caution. A little overkill is going to cost very little material. If I thought 24 inches was enough,..then I would error on the conservative side and make them 36 inches.
You could quickly test a proto-type by just attaching one and stepping on it and seeing if it bounces.
FWIW, I believe the concern should be for the actual attachment to the framing and not the length of the strap. The greatest point of stress will be right at the top of the plate where it is welded to the strap. A pair of bolts at this point should keep the plate in place, another pair a couple of inches higher for reinforcement and a pair at the bottom. Overall length of the plate - about 10" with 6 bolts. I would increase the thickness of the plate to 3/8" (or more) for the stiffness factor. Next time you pass one of those traffic light poles with the horizontal tapered cantilever look at the base plate and how it is connected and how long it is. It appears rather small for what it is asked to support but it is sure thick.