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RISS 인기검색어
- 검색키워드
- 저자 : Hadj Bekki (검색결과 4 건)
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Hadj, Bekki,Rabia, Benferhat,Daouadji, Tahar Hassaine Techno-Press 2021 Coupled systems mechanics Vol.10 No.1
The porosity of functionally graded materials (FGM) can affect the static and dynamic behavior of plates, which is important to take this aspect into account when analyzing such structures. The present work aims to study the effect of the distribution shape of porosity on the free vibration response of simply supported FG plate reposed on the Winkler-Pasternak foundation. A refined theory of shear deformation is expanded to study the influence of the distribution shape of porosity on the free vibration behavior of FG plates. The findings showed that the distribution shape of porosity significantly influences the free vibration behavior of thick rectangular FG plates for small values of Winkler-Pasternak elastic foundation parameters.
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Bekki Hadj,Benferhat Rabia,Tahar Hassaine Daouadji 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.72 No.1
The functionally graded materials (FGM) used in plates contain probably a porosity volume fraction which needs taking into account this aspect of imperfection in the mechanical bahavior of such structures. The present work aims to study the effect of the distribution forms of porosity on the bending of simply supported FG plate reposed on the Winkler-Pasternak foundation. A refined theory of shear deformation is developed to study the effect of the distribution shape of porosity on static behavior of FG plates. It was found that the distribution form of porosity significantly influence the mechanical behavior of FG plates, in terms of deflection, normal and shear stress. It can be concluded that the proposed theory is simple and precise for the resolution of the behavior of flexural FGM plates resting on elastic foundations while taking into account the shape of distribution of the porosity.
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Grain Size Correction of Pavement Unbound Granular Material Using Recycled Glass Aggregate
Abderrahmane Doukani,Hadj Bekki,Lazhar Hariche 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.2
Millions of tons of used glass are recovered worldwide each year. As an environmental friendly solution, the glass waste are collected and recycled to manufacture new glass products. Nevertheless, the additional cost associated with separating waste glass materials can be seen as an inconvenience in this closed loop recycling method. This is why it is very interesting to valorise this waste material in other areas. Using glass waste in geotechnical applications and road construction has showed a particular interest. However, using such technique is hampered by insufficient knowledge on geotechnical characteristics of mixtures of natural materials and glass waste. This research investigates using Recycled Glass (RG) to correct the grain size of an unbound granular material for road pavement. The reference material is a crushed limestone of a class 0 − 20 mm which presents a deficiency of fine aggregates. Bearing tests, mainly Proctor and CBR tests, were conducted on the reference material and the mixtures composed of natural material and RG. The hydraulic conductivity was also measured. The findings indicated that the addition of the fine part of glass waste allowed correcting the grain-size distribution and therefore the bearing capacity has been improved. Furthermore, the mixture of natural material and RG upgrades the permeability class, which contributes to the durability of pavement layers.
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Tahar Hassaine Daouadji,Lazreg Hadji,Mohamed Ait Amar Meziane,Hadj Bekki 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.59 No.1
In this paper, the problem of interfacial stresses in steel beams strengthened with a fiber reinforced polymer plates is analyzed using linear elastic theory. The analysis is based on the deformation compatibility approach developed by Tounsi (2006) where both the shear and normal stresses are assumed to be invariant across the adhesive layer thickness. The analysis provides efficient calculations for both shear and normal interfacial stresses in steel beams strengthened with composite plates, and accounts for various effects of Poisson’s ratio and Young’s modulus of adhesive. Such interfacial stresses play a fundamental role in the mechanics of plated beams, because they can produce a sudden and premature failure. The analysis is based on equilibrium and deformations compatibility approach developed by Tounsi (2006). In the present theoretical analysis, the adherend shear deformations are taken into account by assuming a parabolic shear stress through the thickness of both the steel beam and bonded plate. The paper is concluded with a summary and recommendations for the design of the strengthened beam.
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