forces in bolts connecting sister members
forces in bolts connecting sister members
(OP)
Hi all,
I am designing a repair of a wooden beam by sistering it with steel channels on its side. The channels are to be connected to the wood member by through bolts. What are the forces that I need to consider while designing the through bolts for composite action of wood and steel channels like vertical shear, shear flow etc?
Thanks in advance,
Sarju
I am designing a repair of a wooden beam by sistering it with steel channels on its side. The channels are to be connected to the wood member by through bolts. What are the forces that I need to consider while designing the through bolts for composite action of wood and steel channels like vertical shear, shear flow etc?
Thanks in advance,
Sarju






RE: forces in bolts connecting sister members
If the channels are also directly underneath decking or joists that transfer load into the original beam, then you probably don't need bolts at all other than to stabilize or brace the channels.
RE: forces in bolts connecting sister members
The channels do not run the full length of the beam and are only to be provided partially at the mid span. Also the ceiling is hung from the bottom of the beam and the wood beam is deeper than the channels with the top of both members being almost flush.
Sarju
RE: forces in bolts connecting sister members
RE: forces in bolts connecting sister members
Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.
RE: forces in bolts connecting sister members
Look for a flitch beam design example, should give you an idea of the appropriate calculations and checks you need to do.
For this sort of thing, I'd probably look to add a new topping wood member and through bolt it to existing, again considering shear flow to get the new deeper member to act compositely.
M.S. Structural Engineering
Licensed Structural Engineer and Licensed Professional Engineer (Illinois)