# Compression buckling of column

• Engineering
Homework Statement:
For the minor axis , the buckling length shall be 2*5 = 10m , right ?? (because in minor axis, it's cantilever , nothing to restrain the column on top) . However, the program detect the buckling length as 5.0m.
Relevant Equations:
Not applicable
Hi, all. The top beam is subjected to uniformly distributed load. FYI, the column is 5m in length. As you can see, the major axis of column is connected to the beam with moment connection on top. However, in the minor axis of column, there's nothing to connecting them.

For the major axis, the buckling length shall be 0.7*5 = 3.5m (K = 0.7 for bottom pinned, top fixed condition) ,

For the minor axis , the buckling length shall be 2*5 = 10m , right ?? (because in minor axis, it's cantilever , nothing to restrain the column on top) . However, the program detect the buckling length as 5.0m.

So, my question, for the minor axis, is it considered as cantilever ? Or since in the major axis, it's already gt the moment connection, in minor axis of connection, there's really doesn't matter whether the minor axis of column in restrained or not...

#### Attachments

• frame.JPG
40.1 KB · Views: 20
• frame_2.JPG
74.5 KB · Views: 16