الفهرس 
AcknowledgmentOnly 14 pages are availabe for public view
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Abstract
The work reported in this thesis is concerned with the
economic solution of nonlinear dynamic finite element
equations. The nonlinearity is due to the material
nonlinearity , the large displacements and rotations or
both .
The equations are integrated using the methods of
direct time integration and mode superposition
In direct time integration method the response of the
system is dependent on the size of the step t that is
dependent on the frequency content of the system.
In mode superposition method the response is
approximated using only a small number of the lower mode
shapes and frequencies which correspond to the initial
configuration of the system . This version is denoted by
NDYN = 2 Displacements and stresses obtained using
NDYN = 2 are revised by adding the effect of the
remaining higher modes based on static analysis. There are
two an
the first, a ~_wo techinques for including this effect, L. first
procedure under the static effect is employed,
NDYN = 3 , and in the second a linear static effect is