الفهرس 
METHODS OF DETERt’1INATION OF THE ELASTIC CRITICAL LOADSOnly 14 pages are availabe for public view
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Abstract
The thesis investigates the effect of load location on the
•
beams of
single-bay,
multi-bay, and multi-storey
rectangular
•
•
•
frames on their elastic critical loads.
The direct as well as the stiffness methods of analysis are
used in this study. A comparative study between the two methods
for
the determination of the elastic critical loads of
rectangular frames loaded away from the corners is made. Results
showed that both the direct method -when the axial force in the
beam is taken into consideration- and the stiffness method give
the same elastic critical loads.
The effect of both the change of the frame geometry under
increasing loads and the magnitude of the disturbing force on the
elastic critical loads of frames is studied. Results showed that
the first effect is significant as the loads move away from the
corners and the second affects the elastic critical loads of the
frames and may change their critical mode.
An extension
to
the physical meaning of the nonlinear
behaviour of plane frame is produced to explain the behaviour of
the modified stiffness matrix.
Experimental tests are carried out and the results obtained
are compared with the results from theoretical methods. A good
agreement
have been achieved between the experimental
and the
theoretical results when the frames are loaded at the corners.
But the difference is appeared when the frames are loaded away
from the corners