الفهرس 
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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.