I am modeling a 4.4mx4.4m steel braced frame tower like structure, 25m high, with operable machine floor at top.
I have modeled The columns and horizontal members(beams)
to be fixed at the joints(no releases). And with hinge supports.
SAP2000 automatically assign effective length factor k=1 for the beams and braces.
I would like to ask what value of "R" (overstrength factor) is suited for my model referring to table 16-N of UBC97.
Can someone please define more the meaning of
1.) Ordinary braced frame
2.) special concentric braced frame
3.) and when is dual systems be used.
can you please provide code references for me also to look at.
thanks a lot in advance!