modeling semi-ridgid connections

huangyhg

modeling semi-ridgid connections
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.
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not all packages can do this, even if your is capable then you may need to enter it as a spring constant in yours.
is it possible to set the connections as rigid and modify the modulus of the end portion of the member.  say for a   
the program i use allows for a rotational spring.
daveatkins
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.