leaning column loading

[kavir]

Hi
in my model there is p-delta column and if "P" be total Load "(Dl+LL)*$WBuilding" on each Roof so my question is:
what is the load that must be applied to leaning column at each floor?
please explain

[fmk]

that portion of the lateral load that the frame will resist. similar to the percentage of the horizontal floor mass you are assigning to the nodes in the frame.

[kavir]

is there any effect of p-delta column (leaning column) on stiffness of a frame?
In my model, period of frame is different with and without p-delta column. is it normal?

[fmk]

depends on how you model it and if the pDelta column has undergone displacement.

[fmk]

do you mean that with Pdelta the displacements are different than w/o PDelta for some transient analysis .. the answer is yes .. they are different models

[fmk]

yes.


yes .. what you describe is consistant with a large PDElte effect on a building .. think what hapens with the typical PDElate effect shown in textbooks for a pushover case.