Behaviour of thin-walled structures under combined loads
Abdelraouf Al-Sheikh
2134/7413
https://repository.lboro.ac.uk/articles/thesis/Behaviour_of_thin-walled_structures_under_combined_loads/9213806
The thesis is concerned with the theory of thin-walled beams of
open section. The aim is to formulate a general beam element for
analysis of this type of structure. Thus a general stiffness matrix
for the element, and a transformation matrix for loads and displacements
with respect to centroid and shear centre were derived, by
taking into consideration the value of-bimoment due to an axial force
offset from the shear centre. Internal forces including bimoments,
and global displacements including warping were calculated, and the
stress distributions on the cross-sections of a beam at each-element
node, were evaluated. The problem of buckling of thin-walled beams
was treated using a finite strip program which was formulated to
solve problems with the following combination of stresses:
a) Linearly distributed axial stresses
b) Uniform lateral stresses
c) Uniform shear streses
The results for beams of cruciform, box and channel sections, under
uniform axial stresses and linearly distributed axial stresses, also
accounting for flexural stresses, were conpared with other theoretical
and some experimental results. The agreement was satisfactory.
A series of, laboratory tests on beams of channel sections under compression
were carried out. The recorded failure load and critical
buckling load, computed by the Southwell plot method, were compared
with the finite strip results and satisfactory agreement was observed.
2010-11-29 12:20:57
untagged
Engineering not elsewhere classified