الفهرس 
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Abstract
Shells are important components of many industrial complexes.
Performance of shells due to the extreme loading conditions shows that
buckling is the major failure mode in such components. Shells have
several applications in engineering structures and most particularly in
civil engineering, and mechanical engineering, architecture, aerospace
and marine industries.
Although Shells are important components of many industrial
complexes, and they are becoming more prominent these days, many
researches are required to buckling in shells. The best way to cover
this point is the parametric study on stability of shell roof structures
under different load types. There are different methods used in these
decades the proposed method is not covered yet. During the past
decades, several researches have been conducted on the stability of
shell roof structures under different load types.
The main purpose of this study is to propose a methodology that
the stability of shell roof Structures under different load types. The
data used in this research was collected according to theoretical values,
model geometry, different loads, and buckling of shell. The models use
the finite element method to give recommendations or guidelines to
study the stability of shell roof structures under different load types.
A compare between results of analytical model by ANSYS and
collector models are used to validate the proposed models. The
contribution of this study is to present a reveal that the different load
types on shell roof structures can play a noticeable role in creating
stress concentration and effect destructively the stability of structures.
Keywords: Analytical Model; Finite Element Model; Thin-walled shells;
Buckling; Parametric study; Different loads.