الفهرس 
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Abstract
This thesis deals with the nonlinear analysis of steel frames. The previous
work in this field was reviewed. A mathematical model that describes the
nonlinear behaviour of such structures was suggested. Also, the
mathematical formulii necessary for the solution were presented. The
nonlinear effects taken into account are : plasticity; instability; effect of
material nonlinearity; effect of axial forces on the plastic bending
moments, and effect of change of geometry. A computer program for the
analysis was prepared and the results were verified by comparing them
with previously published results. Based on the study performed,
conclusions and suggestions for future studies were given.