M. Sheidaii - Profile on Academia.edu (original) (raw)

Papers by M. Sheidaii

Dynamic Snap-through Buckling of Tuss-type Structures

International Journal of Space Structures, 2001

Structural and Multidisciplinary Optimization, 2014

Your article is protected by copyright and all rights are held exclusively by Springer-Verlag Ber... more Your article is protected by copyright and all rights are held exclusively by Springer-Verlag Berlin Heidelberg. This e-offprint is for personal use only and shall not be selfarchived in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version for posting on your own website. You may further deposit the accepted manuscript version in any repository, provided it is only made publicly available 12 months after official publication or later and provided acknowledgement is given to the original source of publication and a link is inserted to the published article on Springer's website. The link must be accompanied by the following text: "The final publication is available at link.springer.com".

Collapse behavior of single-layer space barrel vaults under non-uniform support settlements

International Journal of Steel Structures, 2013

ABSTRACT Single-layer space barrel vaults are appropriate structures for covering extensive space... more ABSTRACT Single-layer space barrel vaults are appropriate structures for covering extensive spaces with large spans for which non-uniform support settlement is considered as a great concern. This can affect the stability and collapse behavior of these structures. Accordingly, in this paper, the collapse behavior of the barrel vaults with different slope angles is investigated under various types of the non-uniform support settlement. Both material and geometrical nonlinearity are taken into account while studying the effects of the settlements on the collapse progression in barrel vaults. Finally, the optimum slope angles of the structures are determined so that it minimizes the destructive effects of the support settlement. Moreover, the allowable values of the non-uniform support settlements provided by several code provisions have been investigated in detail.

Optimal design of double layer scallop domes using genetic algorithm

Applied Mathematical Modelling, 2013

ABSTRACT An efficient methodology is proposed for optimal design of large-scale domes with variou... more ABSTRACT An efficient methodology is proposed for optimal design of large-scale domes with various topologies and dimensions in plan. The major concern with the optimal design of large domes is the difficulties arising from plurality of design variables, i.e., size and shape variables. This complexity has propounded the optimal design problem of large scale domes as a great challenge over the years. Thus, in current study, extending the novel idea of using parametric mathematical functions, design variables are correlated to the geometrical properties of domes through a new point of view. Additionally, a modified sizing approach is taken up while treating with element sections. In this way, the number of design variables is decreased. Consequently, fewer numbers of these variables provides an impressive condition that considerably takes down the computational efforts needed to explore the design space for finding the solution of optimization problem. Optimization task is performed by the robust technique of genetic algorithm. The presented approach is applicable to a wide variety of enormous domes with outsized number of nodes and members. However, to show applicability as well as computational advantages of the presented algorithm, a numerical example of scallop domes is investigated.

Journal of Constructional Steel Research, 2012

In recent decades, steel plate shear walls have come to be considered as a convenient system for ... more In recent decades, steel plate shear walls have come to be considered as a convenient system for resisting lateral loads due to earthquakes and wind, especially in tall buildings, because of their ductile and energy absorption behaviors. The existence of openings affects the seismic behavior and performance of steel plate shear walls. In the present research, the effects of opening dimensions as well as slenderness factors of plates on the seismic behavior of steel plate shear walls are studied experimentally. Eight 1:6 scaled test specimens, with two plate thicknesses and four different circular opening ratios at the center of the panel, have been manufactured and were tested under the effects of cyclic hysteresis loading at the thin-walled structures research laboratory of Urmia University, Urmia, Iran. The hole was put in the center of the panel because this is the most detrimental location in view of the panel tension field action. The obtained results signify a stable and desired behavior of steel plate shear walls for large displacements of up to 6% drift. The creation of openings decreases the initial stiffness and strength of the system, and increasing the opening diameter will intensify this matter. The obtained ductility of specimens shows the stable functioning of a system in the nonlinear range. Although the stable cyclic behavior of specimens in the nonlinear range causes mostly a dissipation of energy during the loading of samples, but existence of an opening at the center of the panel causes a noticeable decrease in energy absorption of the system.