Rotational stiffness
Rotational stiffness
(OP)
Hi all,
I'm exploring the steel construction manual 13th edition. But I'm unable to find how I should calculate the rotational stiffness of a connection. Please enlighten me.
Thanks
I'm exploring the steel construction manual 13th edition. But I'm unable to find how I should calculate the rotational stiffness of a connection. Please enlighten me.
Thanks





RE: Rotational stiffness
I'm not aware of any standard guides that have this. I've always told people to look up the test results data (moment rotation curve) and use that as the basis of their connection stiffness approximation.
For fully restrained moment connections you can assume that the beams are rigidly connected to the columns.
RE: Rotational stiffness
Now I have found those boundaries in AISC specification for struct steel buildings (Ks >= 20EI/L fully restrained, Ks <= 2EI/L simple). But I can't seem to find a way to calculate Ks, which is the secant stiffness of a connection.
I need to calculate the rotational stiffness for moment connections in order to use them in my global analysis. In fact, what I'm trying to do is theorically predict the moment rotation curve you would get from tests, without actually having to perform these tests.
RE: Rotational stiffness
FEMA 356 Prestandard and Commentary for Seismic Rehabilitation of Existing Buildings
UFC 4 23 03 Design of Buildings to Resist Progressive Collapse
ASCE 41-06 Seismic Rehabilitation of Existing Buildings
RE: Rotational stiffness
RE: Rotational stiffness
Stability Design of Semi-Rigid Frames
Chen, Goto, Liew
Wiley Interscience
RE: Rotational stiffness