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Rigidity of an oblique frame

Rigidity of an oblique frame

For calculating the center of rigidity of a floor system , i know that i have to first find the rigidity of frames in horizontal and vertical direction ,
but now i am confronted with something that im not capable to understand and calculate ,
i will attach the columns plan here in this post , i need your guide ,
something else : for calculation i see that we have to assume some profiles for columns , and beams , before analyze , and i have really no experience now to assume profiles , what do u suggest i look for ? i mean any subject to study , or just out of the blue with some logic ,,,,

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