The headers don't necessarily have to be curved. A single layer of
glulam, of appropriate depth for the load, could run inside the
confines of the inner and outer wall surfaces. The rest is blocked out
to form the curves as required.
Another idea is to build up a curved beam out of cabinet grade plywood, by
laminating layers together until you have the right thickness. The
thickness of the "lams" will depend on the radius required.
Bob Morrison, PE, SE
R L Morrison Engineering Co
I hesitated from mentioning that, Bob. The OP was a bit vague about
how big the headers are. The chord of a circle header that I mentioned
would keep all loads simple - direct bearing. If the OP is trying to
cut out a bigger section of the circle the loads at the header could
present problems - eccentric loads requiring cantilevering, etc.
How about having them fabricated in steel, something like a curved
I-beam. Have the fabricator put holes at appropriate points for lag
bolts / screws to attach to framing.
I found this
Dont know with the details the OP mentioned, but some yaers back,I
worked with a guys who had a curved wall and the "architect" specified
forming and pouring a concrete header for the curve (with rebar etc) It
was about 4 ft of a radius. I wasnt confortable with it at the time
but we have been back over the years and asolutely no problems.. ( at
least 10 years old now)
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