الفهرس 
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Abstract
Il~T·RODU C C!’I ON
With the increase of the use of struc”ural steel
frameworks and the improvements developed in the properties
and strength of steel, the cross sections of the sceel structure
elements are smaller and the members become generally more
sle~cer • In such a case, the problem of elastic stability
becomes of vital i~p6,tance and so the determination of the
elastic critical buckling loads of structural frameworks to
avoid failure due to elastic buckling
l·cany investigations have been cione and researches
carried o’..lt for the study of tee elastic buckling of frames,
a~ong authors wc8 -created this problem are ’l’imoshenko (47),
Bleich (1), l1erchant (20, 21, 22, 23& 24), croldberg (5& 6),
ii ·;e sl:.· a:::i Chan:iler ( 17; , Eartma= ( 7) , 3o::f ( 1 2) , lu, L. ’W.
( 1 9) , Cr,walla ~ 8& 9), Smith ( 37), Vi jakkr.ana ( 39), ’licoci ( 4C))
and Salem (30,31,33,34,35& 36) • In the last three decades,
with the cievelopement of the plastic theory, stability considerations
where extended to the plastic range and frame instability
i~ the plastic range was studied by Baker ( 2), I:e:=an
(9, 1Ji 11), ::iorne (13, 14& 15), Katkhuda (16), .:.ivesley (18),
I>:ercha?J.t (22, 23), :\eal (26) and Salem (32) • Yet, there are
still various types of s-:ruotural frameworks the stability of
;;h:.ch ::ee:i ~o be investigate:i specially with the development
oi’ e:;.e :-:r::>r.:’ .. c :or;:puters which si112plified a great ceal the
solucio:”. of e::p;.aticns cie:’inir:g the buckling loads which are