M. Sheidaii | Urmia University (original) (raw)
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Papers by M. Sheidaii
International Journal of Space Structures, 2001
Structural and Multidisciplinary Optimization, 2014
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.
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
International Journal of Space Structures, 2001
Structural and Multidisciplinary Optimization, 2014
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.
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