Moment frames in two directions
Moment frames in two directions
(OP)
Does anyone have any advice on using steel moment frames (IMFs) in two directions for a building in Seismic Design Category D? Specifically, is it even possible to use prequalified connections in each direction at the same joint?






RE: Moment frames in two directions
AISC / SAC has limited database for weak-axis moment connections. Here is an excerpt from FEMA-350. In summary, moment connections in both axis of a column can be designed but there are no pre-qualified connections. All connections have to be tested.
3.3.3.3 Connections to Column Minor Axis:
Connections to the minor axis of a column should be qualified by testing following the procedures of Section 3.9. If minor-axis connections are to be used in conjunction with major-axis connections at the same column, the testing program should include biaxial bending effects at the connection.
Commentary: In general, the prequalified connections have not been tested for use with columns oriented so that beams connect to the minor axis of the column. Two tests of Reduced Beam Section connections in this orientation were conducted, which indicated good performance. These tests were conducted to provide a general indication of the possible performance of weak axis connections, but are not considered to comprise a sufficient database for prequalification of such connections.
RE: Moment frames in two directions
RE: Moment frames in two directions
SureFrame 2 can be used in corner, T, and full dual strong axis configurations.
RE: Moment frames in two directions