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Abstract In the past, skeleton-type multi-storey building frameo have been sheeted by walls or panels of substantial masonry construction and these were sufficiently stiff to brace the frame against buckling in the sway mode. This form of construction now is not muchused and major buildings are being constructed in which the enclosure contri- butes small or negligible stiffness to side sway such as glas~ panel- ling. Under these circumstances, the frame itself must provide its own resistance against buckling in the sway mode or bracing material must be deliberately provided to replace the stiffness that may have been obtained from masonry walls. This problem of overall stability of multi-storeY building acquires greater importance also as a result of the recent introduction of higher-strength structural steels which operate at appreciably higher stresses and leads to more slender sec- tions. The overall stability of multi-storey unbraced frames has been ~ discussed by many authors. Bleich (1) and Merchant (4) obtained the sway buckling loads of unbraced uniform multi-storey frama:>under constant axial loads. Salem (10) gave the sway buckling loads of unbraced multi-storey frames loaded at intermediate floor levels and ~ving regular variation of column sections. Goldberg (2) ~s the firot to tackle the problem of lateral buckling of braced frames. |