الفهرس 
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Abstract
The present research work deals with an investigation of the
nonlinear static and dynamic behavior of structural frames when subjected
to earthquake loading.
The thesis starts with an extensive literature survey of published
work concerning the elastic stability analysis of framed structures and also
the simulation of artificial earthquake records by various methods.
The nonlinear static analysis by the finite deflection theory IS
presented with its equilibrium equations for geometrically nonlinear
behavior of framed structures. An algorithm based on the finite deflection
theory is used to determine the elastic critical buckling loads of frames
subjected to earthquake loads.
The dynamic analysis of geometrically nonlinear structures is
carried out using the step-by-step time integration methods in the time
domain. Two methods are presented : Newmark-B and Wilson-9
methods. The analytical procedures are explained and implemented in a
computer program. An analytical procedure for simulating artificial earthquake records
using the auto-regressive AR model is presented. A proposed technique
for simulating earthquake records by the modified auto-regressive model
is explained in detail. Applications have been performed on different
structures in order to determine their dynamic response when subjected to
real and simulated earthquake records. The efficiency of the proposed
technique (the modified auto-regressive method) is also examined for
practical design.