axial force for beams

lorenzo · Post by **lorenzo** » Thu Mar 06, 2008 1:41 am

I'm executing a dinamic time History analysis for a 2-D rc frame, 4 storeys,2 bays.
I use fiber sections,material are concrete01 and steel01.
I use equalDOF command for each node of the storey.
I was expected zero value for axial force in the beams,but in output it isn't zero!
The output X-disp of the nodes are the same!
I think it is due to fiber approach for section definition...is it possible?
And what is the reason of this?
thanks for your kind attention.have a good day.lorenzo

silvia · Post by **silvia** » Thu Mar 06, 2008 7:03 am

you should really use concrete02 and steel02....

you are getting axial force because you are constraining the nodes and not letting the beams deform axially....

i don't know why you are getting different X displacements. check your constraints.