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Modeling Semi-Ridgid Connections

Modeling Semi-Ridgid Connections

Modeling Semi-Ridgid Connections

(OP)
What is the best way to model a semi-rigid connection with an FE program.  Most of the ones I've used don't have this as an option.  We are looking at the sway in a frame that has been lateraly loaded.  Any suggestions?  Thanks.

RE: Modeling Semi-Ridgid Connections

Not all packages can do this, even if your is capable then you may need to enter it as a spring constant in yours.

RE: Modeling Semi-Ridgid Connections

(OP)
Is it possible to set the connections as rigid and modify the modulus of the end portion of the member.  Say for a member that is 14' long, take 2' at the end of the beam and modify the E value so that this allows for a small rotation.  This is like the way Visual Analysis does it.

RE: Modeling Semi-Ridgid Connections

The program I use allows for a rotational spring.

DaveAtkins

RE: Modeling Semi-Ridgid Connections

I am not sure if our program allows for a rotational spring or not, but even if yours does you will need to test the connection to get the moment-rotation curve.
We do a lot of type II with wind connection buildings (now called FMC connections).  I model it as rigid connections and multiply the drift by 1.5 to 2.  I got this number from a paper I read on the subject.  If you would like the reference, let me know and I will dig it up.

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