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Taleb Saima Sultana(탈렙 사이마 술타나),Choi, Jae Hyouk(최재혁),Viliana Jainih(빌리아나 자이니) 대한건축학회 2022 대한건축학회 학술발표대회 논문집 Vol.42 No.2
Pipe racks are used in almost all industries in Bangladesh, but maintenance is still an issue. Bangladesh is an earthquake-prone country. Bangladesh is still researching the proper maintenance of pipe racks in an earthquake or other hazardous event. Seismic compliances on existing steel structure in Malaysia are somewhat not widely practiced due to the change made in design code only recently in 2015. This includes the design of framework or pipe racks usually used in petrochemical, chemical and power plants to support pipelines, power cables etc. Its geological characteristics due to moderate seismicity (especially in East Malaysia) have alerted the local authorities and private associations regarding its structural and plant design, regulations, and maintenance works. This is due to the maintenance, fabrication, construction, and installation of the piping system including the framework are known to contribute to pipeline accidents in a chemical plant. This paper provides a comparative discussion of the design criteria used for pipe racks in the legislation and maintenance of industrial complexes in Bangladesh and Malaysia.
Analytical study of buckling profile web stability
Taleb, Chems eddine,Ammari, Fatiha,Adman, Redouane Techno-Press 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.53 No.1
Elements used in steel structures may be considered as an assembly of number of thin flat walls. Local buckling of these members can limit the buckling capacity of axial load resistance or flexural strength. We can avoid a premature failure, caused by effects of local buckling, by limiting the value of the wall slenderness which depend on its critical buckling stress. According to Eurocode 3, the buckling stress is calculated for an internal wall assuming that the latter is a simply supported plate on its contour. This assumption considers, without further requirement, that the two orthogonal walls to this wall are sufficiently rigid to constitute fixed supports to it. In this paper, we focus on webs of steel profiles that are internal walls delimited by flanges profiles. The objective is to determine, for a given web, flanges dimensions from which the latter can be considered as simple support for this web.
A new plate model for vibration response of advanced composite plates in thermal environment
Taleb, Ouahiba,Houari, Mohammed Sid Ahmed,Bessaim, Aicha,Tounsi, Abdelouahed,Mahmoud, S.R. Techno-Press 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.67 No.4
In this work, a novel hyperbolic shear deformation theory is developed for free vibration analysis of the simply supported functionally graded plates in thermal environment and the FGM having temperature dependent material properties. This theory has only four unknowns, which is even less than the other shear deformation theories. The theory presented is variationally consistent, without the shear correction factor. The present one has a new displacement field which introduces undetermined integral variables. Equations of motion are obtained by utilizing the Hamilton's principles and solved via Navier's procedure. The convergence and the validation of the proposed theoretical model are performed to demonstrate the efficacy of the model.
On TCP Performance over Multi-Hops Satellite Constellations
Taleb, Tarik,Kato, Nei,Nemoto, Yoshiaki 통신위성우주산업연구회 2002 Joint Conference on Satellite Communications Vol.2002 No.-
TCP is the most widely used transport protocol on today's Internet. A large part of its success is due to its ability to probe for unused bandwidth while also backing off its transmission rate upon detection of network congestion. Despite the fact that several mechanisms have been presented in recent literature to improve TCP, there remain some vexing attributes that impair TCP's performance. In this paper, we address the issue of the efficiency and fairness of TCP in multi-hops satellite constellations. We mainly focus on the effect of the change in flow count on TCP behavior. In case of handover occurrence, a TCP sender mat be forced to share a new set of satellites with other users resulting in a change of flow count. Our work argues that the TCP rate of each flow should be dynamically adjusted to the available bandwidth when the number of flows, competing for a single link, changes over time. We show through simulations that our fair share scheme improves fairness by guaranteeing a fair progression in window size for each flow, decreases the number of losses, and makes better utilization of the bottleneck link.
Taleb Zarei,Masoud Farsiani,Jamshid Khorshidi 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.1
In order to better understand the hydrodynamics of valve trays, air-water operation in an industrial scale tower with 1.2m of diameter, consisting of two 14% valve trays, was studied. Experimental results of clear liquid height, froth height, average liquid holdup, dry pressure drop, total pressure drop, weeping and entrainment were investigated, and empirical correlations were presented. Then, a three-dimensional computational fluid dynamics (CFD) simulation in an Eulerian framework for valve tray with ANSYS CFX software was done. The drag coefficient, which was used in the CFD simulations, was calculated from the data obtained in the experiments. The simulation results were found to be in good agreement with experimental data at this industrial scale. The objective of the work was to study the extent to which experimental and CFD simulations must be used together as a prediction and design tool for industrial trays.
Computational fluid dynamic simulation of MVG tray hydraulics
Taleb Zarei,Mortaza Zivdar,Rahbar Rahimi 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.5
The flow pattern and hydraulics of a Mini V-Grid valve (MVG) tray is predicted by using computational fluid dynamics simulation. A 3-D CFD model in the Eulerian framework was used. The simulation results for MVG tray are compared with that of sieve tray. The sieve tray geometry and operating conditions are based on the Solari and Bell’s sieve tray [1]. The MVG tray differs from that of Solari and Bell’s sieve tray solely by the difference in design of available openings for the flow of gas. The simulation results show that the clear liquid height and the pressure drop of MVG tray are lower than that of sieve tray whereas the liquid velocity is higher and contacts of phases are good. The simulation results of sieve tray are in agreement with the experimental data of Solari and Bell [1].
Computational fluid dynamics on the hydrodynamic characteristics of the conical cap tray
Taleb Zarei,Ehsan Abedini,Rahbar Rahimi,Jamshid Khorshidi 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.4
This paper addresses an investigation on the hydrodynamic behavior of a new type of cap trays called conical cap tray (ConCap tray). A 3-D computational fluid dynamics model was developed to predict the hydrodynamics of the ConCap tray which is operated in the spray regime. The model considers two phase flow of gas and liquid in a VOF-like code framework. The homogeneous multiple size group model (MUSIG model) and shear stress transport (SST) turbulence model were implemented. Detailed insights into the hydrodynamic behavior of the inside of the cones were obtained. The relation between velocity, pressure and cross section area of the flow inside the cone also was formulated. The computational fluid dynamic (CFD) results show that the pressure variation in the cones forces the liquid on the tray to be highly turbulent, which leads to deform the interface to break up. Effect of different riser heights was also studied by CFD simulations. The results show that the riser height has a significant role in the hydrodynamics of the tray, especially in uniform gas distribution in the tray and reducing weeping rates.
A new plate model for vibration response of advanced composite plates in thermal environment
Ouahiba Taleb,Mohammed Sid Ahmed Houari,Aicha Bessaim,Abdelouahed Tounsi,S. R. Mahmoud 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.67 No.4
In this work, a novel hyperbolic shear deformation theory is developed for free vibration analysis of the simply supported functionally graded plates in thermal environment and the FGM having temperature dependent material properties. This theory has only four unknowns, which is even less than the other shear deformation theories. The theory presented is variationally consistent, without the shear correction factor. The present one has a new displacement field which introduces undetermined integral variables. Equations of motion are obtained by utilizing the Hamilton's principles and solved via Navier's procedure. The convergence and the validation of the proposed theoretical model are performed to demonstrate the efficacy of the model.