Fixity of Braced Beam column Connection
Fixity of Braced Beam column Connection
(OP)
Hello,
If I am designing a diagonal brace for a corner connection with a beam shear connection to the column, how does the brace affect the end condition of the beam?
The brace gusset attaches the beam flange to the column flange --doesn't this fix the beam beyond simple shear and transfer beam moment into the column?
Thanks,
If I am designing a diagonal brace for a corner connection with a beam shear connection to the column, how does the brace affect the end condition of the beam?
The brace gusset attaches the beam flange to the column flange --doesn't this fix the beam beyond simple shear and transfer beam moment into the column?
Thanks,






RE: Fixity of Braced Beam column Connection
If you post a sketch showing proper beam, column and brace sizing, we could provide further input.
RE: Fixity of Braced Beam column Connection
BA
RE: Fixity of Braced Beam column Connection
RE: Fixity of Braced Beam column Connection
Alternatively, if we are talking about a brace which extends from underside of beam to bottom of column, that is a different kettle of fish. Perhaps a sketch is in order.
BA
RE: Fixity of Braced Beam column Connection
mfritze - since the braced frame is stiffer than the "moment frame" created by the gusset at the beam-column connection, the load is assumed to go to the brace and a braced frame is analyzed with pinned connections. However, more attention to this connection is required for Special Concentric Braced Frames used in high seismic areas. Seismic drift can be very large and the beam-column-gusset must withstand large rotations.
RE: Fixity of Braced Beam column Connection
It restrains rotation of the beam.
Yes, it does, a substantial moment and it cannot be ignored. The connection at each end of the brace may be pinned, but axial force in the brace puts moment in the column.
BA