الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
In this thesis, a detailed procedure is presented
for computing the·dynamic characteristics of transmission
towers.
A paramete~ic study is carried out to examine
the dependence of these characteristics on various factors.
The
thesis is made up of five chapters and three
appendices.
Historical review of the subject is presented in
chapter (1).
Brief informations are given concerning
types of towers, materials, construction, structural
loads and methods of analysis.
The main objectives of
the thesis are outlined in this chapter. Th~ method of
analysis is presented i~ Chapter (2).
The analysis
is based on the direct element method for space trUss
analysis.
In chapter (3) the natural frequencies and
mode shapes are computed from the study of the free
vibration of the tower.
Comparisons are made with
previous· work to verify the accuracy of the present
work.
In Chapter (4) , a parar.ete r.i.cstudy presented
to show the dependence of the vibration characteristics
on various tower parameters.
The main conclusions of
. .
this work is presented in Chapter (5).