Summary
The required joint stiffness as well as the lateral bracing stiffness of unbraced rectangular frames subjected to vertical loading are discussed in conjunction with their loadcarrying capacity. The sway-buckling mode of such frames (implying a considerable decrease in their load-carrying capacity) can be prevented by chosing a suitable combination of values of the above parameters which satisfy a nonlinear interaction equation at each level of the external loading. By providing a lateral support of very small stiffness to an initially unbraced frame, its load-carrying capacity can be increased up to the level of the corresponding capacity of the same frame with no sidesway.
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Kounadis, A.N. Interaction of the joint and of the lateral bracing stiffnesses for the optimum design of unbraced frames. Acta Mechanica 47, 247–262 (1983). https://doi.org/10.1007/BF01189212
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DOI: https://doi.org/10.1007/BF01189212