Local axes

[pkm]

Hi,
i have a frame that i want to define fiber section (as patch quads) for elements.(xy plane) , i mean for example in IPE20 for column we could have 2 different way :
(just imagine you are looking at section from above in xz plane)

1) I shape
----
|
----

or
2) H shape

|---|

How should i define patches in these different cases?
I wish i could have explain my problem clear!!
thanks

[vesna]

Please look at the example manual and you will find the answer to your question:
http://opensees.berkeley.edu/wiki/index ... _W_Section

[pkm]

would you please give me an example in a steel frame?
I have problem in defining beam sections and column sections!
if i define one section for both, how the opensees model them, i mean about local coordinates!

[vesna]

define a same section for both and then use geometric transformation command (http://opensees.berkeley.edu/wiki/index ... sformation) to define local axes for beam and local axes for the column.