الفهرس 
FINITE ELEMENT MODELS AND ANALYTICAL TECHNIQUEOnly 14 pages are availabe for public view
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Abstract
This thesis contains a study for steel roofs which are made from
corrugated steel sheets and have a cylindrical arch shape and that are
commercially named ilK-Span” roofs. This thesis aims to study the
behavior of these roofs under distributed vertical uniform loads and wind
loads to determine the limit loads of these roofs. The research starts with
a complete explanation of the steel k-span roof and its fabrication and
erection procedures and shows the different types of shapes of these
roofs, their usages in construction and their advantages specially that
distinguish them from other traditional steel buildings.
In this research, a numerical procedure using the finite element
technique with nonlinearity in material and geometry is developed for two
types of k-span roofs: that resting on ground and that elevated on columns
and beams. To verify the efficiency of the two suggested finite element
models, a new similar finite element model is developed to compare its
results with the results of a mathematical model that was developed by
previous researchers.
A parametric study is carried out for the two selected systems of
k-span roofs to determine the limit loads of these roofs under vertical
distributed uniform loads and wind loads.
Finally, a complete statistics of results and conclusions are
presented as well as recommendations for future researches.
Key Words: K-Span, cylindrical shells, steel roofs, arch barrel,
buckling, corrugated sheets, von Mises yield criterion,
cold formed, elasto-plastic nonlinear analysis.