Does the member section affect the stability of a structure? I am working on a RAM Elements model that uses a cantilevered column lateral system and is fairly regular in shape. The model was running when I had the main beam size as a W8x21, however when I change the beam to a W8x24 the model becomes unstable. Then a W8x28 will make the model stable again. I am not sure how member sizes would affect stability, I understand it can affect the stiffness and thus the distribution of forces, however stability is different.
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