الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 238 |  |  |
| | | from | 238 | | |
Abstract
The elastic stability of plane frameworks which are subjected
to symmetric nodal loads had been studied often. Herein, the elastic
buckling loads of different types of rigid frames (braced and
unbraced portal frames, multistory frames and trapezoidal frames)
subjected to concentrated loads moving along their beams are
studied. In this case the elastic buckling loads of the frames are
affected by the variation of load ratios on columns as well as by the
presence of primary bending moments. Fixed as well as hinged base
frames with various beam to column bending stiffness ratios, as
well as various beam span to column height ratios, have been
studied. The effect of the axial stiffness of the bracing elements is
taken into account. The bracing elements are assumed to act in
tension as well as in compression. Matrix displacement method of
analysis has been used throughout this study. This method depends
on forming the stiffness matrix of each member then assembling
these matrices to form the overall stiffness matrix of the structure.
The geometrical non-linear behaviour of the members is considered
by introducing the trigonometrical buckling functions to modify the
stiffness matrix of individual members. A computer program based
on this method of analysis was developed. Several published cases
were chosen in order to check the accuracy of the program results.
Key Words:
Structural Engineering ; Steel; Stability; Elastic Buckling; Rigid
Frames ; Columns (Supports) ; Deformations; Variation of Loads;
Primary Bending Moments