الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
In Egypt, the need to electrical power is remarkabley increased for the industerial development and the construction of new areas as in Sinai, which necessitates consructing new overhead transmission lines for which the guyed towers will offer the best solution. Previous indicated that the guyed towers are more economical than self supported towers if the required land for construction is cheap and available.The importance of the use of guyed towers in Egypt implies the necessary studying the suitability of such types of Guyed towers taking into consideration the local environments in Egypt areas,such as electrical, climatic and topographical conditions.
The guyed towers has the advantages of being light in weight, simple in erection and transmission. Also it has the possibility of using helicopters by which the towers can be flown to the site and placed quickly and guyed.
The object of this research work is to find the critical buckling load of guyed towers as a space structure taking into account the actual behaviour of the cables.
Aparametric study is carried out oto study the influence of the cross section and slope of the guys upon the buckling strength of guyed towers having masts of different stiffeness beside the influence of instability caused by axial loads, the change in geometrical quantities of the masts and the actual shape of guys are taken into consideration.
A computer programme is built to determine the bucklig strngth of Guyed towers as space structure.
from the analysis of previous erected towers, it is intended to find an empirical formula for the buckling strength of guyed towers.