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Authors = Siavash Rastkar

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9 pages, 1793 KiB  
Technical Note
Simplified Method to Estimate the Moment Capacity of Circular Columns Repaired with UHPC
by Mahsa Farzad, Siavash Rastkar, Amir Sadeghnejad and Atorod Azizinamini
Infrastructures 2019, 4(3), 45; https://doi.org/10.3390/infrastructures4030045 - 27 Jul 2019
Cited by 5 | Viewed by 7551
Abstract
Ultra high-performance concrete (UHPC) application, to enhance the mechanical strength of axially loaded reinforced concrete bridge substructure elements, was proposed and investigated in an earlier study. The results recommended that depending on the UHPC shell thickness, this method may cause shifting of the [...] Read more.
Ultra high-performance concrete (UHPC) application, to enhance the mechanical strength of axially loaded reinforced concrete bridge substructure elements, was proposed and investigated in an earlier study. The results recommended that depending on the UHPC shell thickness, this method may cause shifting of the critical section to undesired locations, due to over-strengthening of the repaired section, and this should be a design consideration. This paper proposes a new simplified analytical approach to calculate the bending moment capacity of the repaired circular section. This method relies on hand calculations and only requires basic material properties (compressive and tensile strengths). The results from the simplified approach are validated with a well-established numerical sectional analysis method. The proposed approach may be considered simple and more straightforward for professional engineers. Full article
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16 pages, 16418 KiB  
Review
Constructal Theory and Aeroelastic Design of Flexible Flying Wing Aircraft
by Pezhman Mardanpour and Siavash Rastkar
Aerospace 2017, 4(3), 35; https://doi.org/10.3390/aerospace4030035 - 7 Jul 2017
Viewed by 9931
Abstract
The aeroelastic behavior of high-aspect-ratio very flexible flying wing is highly affected by the geometric nonlinearities of the aircraft structure. This paper reviews the findings on how these nonlinearities influence the structural and flight dynamics, and it shows that the aeroelastic flight envelope [...] Read more.
The aeroelastic behavior of high-aspect-ratio very flexible flying wing is highly affected by the geometric nonlinearities of the aircraft structure. This paper reviews the findings on how these nonlinearities influence the structural and flight dynamics, and it shows that the aeroelastic flight envelope could significantly be extended with proper choices of design parameters such as engine placement. Moreover, in order to investigate the physics behind the effects of design parameters, constructal theory of design is reviewed. The constructal theory advances the philosophy of design as science, it states that the better structural design emerges when stress flow strangulation is avoided. Furthermore, it shows that airplanes, through their evolution, have obeyed theoretical allometric rules that unite their designs. Full article
(This article belongs to the Special Issue Aircraft Design (SI-1/2017))
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