الفهرس 
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Abstract
In almost every country of the world today energy
consumption is increasing enormously and electric power
is taking an ever growing share (1). Heasons for its
outstanding popularity are many. As a flexible source
of heat and light, the electric .power is unrivalled and
new applications are being found daily. Perhaps the
most important of all these applications is that the
electricity can readily De supplied to a large number
of consumers through the medium of power line.
~he continuea increase in the demand on the electrical
energy, speCially in growing countries, has
enlarged the interest in constructing thousands of
kilometers of overhea& lines to transmit this effecient
power to where it will be useful. The overhead
lines are mainly composed of conductors, earth wires
and isolators, all supported by high towers defined as
transmision electric towers. The assurance of the
stability of such towers under the action of ordinary
and special cases of loading which may happen is essential
for the safty of the overhead lines. The study
of the problem of stability of transmission towers is
not a simple task if we realise the fact that these
constructions are space ones operating in geometric non linear conditions. This problem has been previously
treated by introducing many simplified assumptions which
lead to a linear space truss analysis for such towers. In
this thesis we tried to examine the behaviour of transmission
tower to be very close to its actual one, this
means a three dimensional non-linear solution for such
towers.