2024-03-28T13:25:26Z
https://jesaun.journals.ekb.eg/?_action=export&rf=summon&issue=16256
JES. Journal of Engineering Sciences
1687-0530
1687-0530
2020
48
No 4
NONLINEAR FINITE-ELEMENT ANALYSIS FOR RC BEAMS STRENGTHENED WITH FABRIC-REINFORCED CEMENTITIOUS MATRIX
Mohamed
Nagah
Ahmed
Arafa
Ahmed Attia M.
Drar
Yehia. A.
Hassanean
Because of the shortcomings of the externally bonded system that mainly consists of epoxy and FRP sheets, the fabric-reinforced cementitious matrix, (FRCM) represents a viable solution in the strengthening of reinforced concrete beams. The FRCM layers consist of fabric mesh embedded in an inorganic stabilized cementitious mortar. Many experimental studies examined the impact of strengthening of RC beams with the FRCM layers, but the numerical investigations are limited. This study is therefore aimed at introducing a numerical study investigating the behavior of RC beams reinforced with FRCM layer. The main goal of this paper is to verify the FEM results with the experimental results that are available in the previous study [1], and to provide a parametric study. The investigated beams in this paper are 150 mm × 250 mm× 3000 mm with two reinforcement ratios. One, two, and three-layers of PBO, (p-Phenylene Benzobis Oxazole) FRCM were investigated as strengthening of the simulated beams were strengthened with. The numerical validation included load-deflection curve, load –strain of both concrete and PBO- FRCM, strain distribution, cracks series and failure mode. The built model gave an accurately prediction of the attitude of the investigated beams. The results also indicated that the rise in the reinforcement ratio or the amount of FRCM layers contributed to improving behavior under both ultimate and serviceability limit states.
Externally bonded system (FRP)
Fabric-reinforced cementitious matrix (FRCM)
FEM
2020
07
01
554
576
https://jesaun.journals.ekb.eg/article_109362_5c02eb771f76158ecc53b3ed889aa15e.pdf
JES. Journal of Engineering Sciences
1687-0530
1687-0530
2020
48
No 4
INCREASING THE EFFICIENCY OF THE RIVER NILE WESTERN BRANCH AT WARRAK ISLAND
Radwa
Salama
Mohammed
Ghareeb
Shaimaa
El Sherbini
Regulated rivers usually subjected to continuous morphological changes due to human interventions and the variation of the flow rates released through them. These changes sometimes affect island banks causing bank failure and deformation. On the other hand, the morphological changes cause the riverbed to aggrade/degrade. This, in turn, may affect the carrying capacity and conveyance of the river channel. To keep the channel conveyance as efficient as possible, bed aggradation should be minimized. This paper basically aims at increasing the efficiency of the River Nile western branch at Warrak Island. Eight scenarios are proposed to achieve this goal, which includes removing the unmanaged human intervention at the island southern nose, dredging the western branch to the safe navigation elevation (12.66 m) and propose a development plan for canalization of this branch. A 2-D numerical model (Delft 3D) was used to simulate this segment of the river to detect and predict the trend of the morphological changes. The ratio of flow passes through this branch is calculated for all cases, it was found to be 31.4% for the current case, while the maximum value of 45.52% occurred when removing of the southern part of the island nose and dredging the branch is applied. The morphological changes were predicted, and it is found that the entrance of the west branch is always subjected to sedimentation due to the general alignment of the river in this region. Results also indicates, for development scenarios, that deposition also occurred in the entrance of the west branch, like before, but the dredging was limited to few locations, which can be handled with dredging. So, it is recommended, in case of using the west branch for navigation in an emergency case, to follow the development of the west branch as a solution.
Morphological changes
River Nile
Warrak Island
Delft 3D
Sedimentation and Dredging
2020
07
01
577
595
https://jesaun.journals.ekb.eg/article_109371_c8b1b22888d73883aa327007a2808a12.pdf
JES. Journal of Engineering Sciences
1687-0530
1687-0530
2020
48
No 4
GREY WOLF OPTIMIZATION APPROACH-BASED EXHAUST TEMPERATURE CONTROL FOR GAS TURBINE POWER SYSTEM
Hany. F. S.
Abu-Seada
Mohamed M.M.
Slama
Mohamed A. M.
Hassan
M. A.
Ebrahim
Gas turbines are one of the most important power generation technologies in countries especially with natural gas resources. However, its complicated technology and the operation of which at peak performance is effective in power generation systems. This paper proposes the use of grey wolf optimization (GWO) approach in optimizing the proportional integral derivative (PID) controller parameters using MATLAB program to control the exhaust temperature of a gas turbine. The main aim is to keep on turbine operation behavior at optimum performance. The achieved results show the effectiveness of the proposed exhaust temperature controller based on the use of the Rowen's model, clearly approach for the gas turbine. The obtained results of the optimum values of the GWO algorithm are compared with those attained using the optimum values of the current 265 MW simple cycle, Actual single-shaft HDGT.
Grey wolf optimization (GWO)
proportional integral derivative (PID)
Combined Cycle Power Plant (CCPP)
optimal control
load disturbances
Heavy-duty gas turbine (HDGT)
fuel stroke ratio (FSR)
2020
07
01
596
612
https://jesaun.journals.ekb.eg/article_111121_bf784e2182df5db5e419bf77353637e8.pdf
JES. Journal of Engineering Sciences
1687-0530
1687-0530
2020
48
No 4
CITIES UNDER PRESSURE CASE STUDY OF NASR CITY DISTRICT - CAIRO
Reham M. Hafez
Hafez
We live in a rapidly urbanizing world. In the next 30 years, 70 million people will move to urban areas every year. By 2050, two-thirds of the global population will live in cities. This rapid urbanizing, expected to continue in the coming decades, so cities face human pressure on its vital infrastructure and social care services and the natural pressure of climate change which set to intensify these existing social and economic challenges. There are physical impacts of these pressure on human health, quality of life, and business life. Therefore, most cities around the world had announced the challenges against the growth and what should be done. The research presents and analyzes the phenomena "cities under pressure" from all aspects and their impacts on citizens. Then moving to the empirical study of Nasr City, one of Cairo's districts to monitor the extent of the pressures and evaluate it to find keys guides for a comprehensive strategy with Executive steps to improve the quality of life and help for working towards sustainability.
Cities under pressure
Urbanizing
Nasr City district
population growth
2020
07
01
613
632
https://jesaun.journals.ekb.eg/article_110506_af18d1fe03c4e962dc3230b512ca61ff.pdf
JES. Journal of Engineering Sciences
1687-0530
1687-0530
2020
48
No 4
TOWARDS ZERO-ENERGY BUILDINGS IN MANSOURA UNIVERSITY
Basma G. A.-F
El Awadi
Mohanad A. M.
Fouda
Alaa S.
El Aishy
The paper introduces the feasibility of achieving zero energy on University buildings in Egypt through retrofitting three buildings affiliated to Faculty of Engineering, Mansoura University) two of them are existing buildings and the third one is under construction (. The paper used the design Builder software, that was used to calculate energy consumption for each building and then to upgrade them. Also, a simulation tool was used to optimize the electricity consumption of the building that is under construction through getting the optimal cooling system. It is evident from the results that retrofitting decreases energy consumption by 50 -90% with the possibility of achieving zero energy by using renewable energy sources such as solar cells.
ZEB
ZEB in university
renewable energy
solar energy
2020
07
01
633
648
https://jesaun.journals.ekb.eg/article_111331_633b3bc6085c6566f6185a2ed2d35925.pdf
JES. Journal of Engineering Sciences
1687-0530
1687-0530
2020
48
No 4
Proposed Paradigms for Developing the Building Laws and Legislations of Residential Architecture in Aden City - South Yemen
Mamdouh Ali
Yousef
Magdy Mohamed
Radwan
Ebtesam AbdAllah Naser
Amber
Since 1990 to date, Aden City has witnessed several changes which have their negative repercussions on the situation of building in residential areas. During that period several building decisions and laws have been made. Some of these decisions and laws have been defective and deficient, as they resulted in the spread of haphazard construction areas and building violations in residential areas as a result of the legislator's neglect of several local and environmental circumstances in the city and the changes that occurred in its residential architecture. This paper is intended to formulate proposed paradigms for developing the building laws and legislations to help manage or reduce architectural and constructional problems in the residential areas of Aden City. The research has come up with a set of findings, the most important of which are the following:
The emergence of building laws is associated with the emergence of architecture, the increase in its areas, its expansion, and the difference of its style across ages. With the development of architecture laws developed depending on the conditions and changes of each period as well as on society's continuous need for what would regulate its building situation throughout history.
The circumstances of each historical phase that societies witness contribute to defining the features of their architectural paradigms which, in turn, and through their main axes, form a main reference for the rules regulating building in them.
The residential architecture paradigms in Aden City can be classified into general paradigms and a paradigm specific to the city (cultural diversity). General paradigms are divided into: typical paradigms that have a fixed influence on residential architecture in the city and atypical paradigms that are changeable over time to adapt to the conditions and requirements of each historical phase witnessed by the city. From these paradigms one can obtain the axes upon which the building laws and legislations in the residential areas of this city that must be based.
This research paper deals with the following points:
Introduction: The research problem, objective, method, and scope.
Historical development of architecture and building laws and legislations as an approach to the formulations of the proposed paradigms.
The beginnings of the emergence of residential architecture in Aden City - South Yemen.
The situation of building in the residential areas of Aden City under Yemeni building laws and legislations during the period post 1990.
The proposed paradigms for developing the building laws and legislations of residential architecture in the residential areas of Aden City.
The most salient axes derived from the proposed paradigms.
2020
07
01
649
686
https://jesaun.journals.ekb.eg/article_111431_b6ba256c73dbd08a095e1879bd62af27.pdf
JES. Journal of Engineering Sciences
1687-0530
1687-0530
2020
48
No 4
Parking Management Strategies for the Development of Assiut Downtown, Egypt: Opportunities and Challenges
Salwa
Megahed
Khaled Ali
Youssef
Local authorities are developing urban management plans for the sake of enabling the urban opportunities offered and rationally react to the challenges imposed. Parking Management Plan, especially in downtowns, is of central importance, due to the challenges of meeting the parking demand, and the economic, environmental and urban consequences. In response, cities have formulated innovative parking management strategies. These strategies go beyond filling the gap between supply and demand to the minimization of demand.
At the local level, the city of Assiut -the Capital of Assiut Governorate- is the largest city in Upper Egypt, and the most attractive and important in the region, especially in the economic and service domains. However, Assiut downtown encounters various urban challenges, among which parking is considered the most severe. Despite successive traffic and planning solutions, the gap between supply and demand remains. In this paper, Parking Management Strategies that would contribute to the local context are investigated. International management strategies are reviewed, the local context is surveyed and analyzed, the appropriateness of these strategies for application is investigated, and requirements of application are identified.
Strategies - Parking
supply
demand
Downtown
Assiut - Egypt
2020
07
01
687
713
https://jesaun.journals.ekb.eg/article_112220_542ea70aca0bfde287be029cc70bfe94.pdf
JES. Journal of Engineering Sciences
1687-0530
1687-0530
2020
48
No 4
Reviving the architectural heritage elements of the facades of new buildings in heritage areas
Raghda Abdel Ghader
Mahmoud
Mohanad Ali Mohamed
Fouda
Lamis Saad eldin
El-Gezawi
The research aims to monitor and analyze the architectural styles of new buildings located in heritage areas and to study the similarity and extent to which they are different from the architectural models prevailing in the heritage areas in terms of the elements and architectural vocabulary of the facades of buildings such as (shape - openings – decorations, etc.). Accordingly, this analytical study was carried out on a number of facades of new buildings, whose facades mimic the old architectural styles of heritage buildings in the cities of Sana'a, Yemen, Beirut, Lebanon, Muscat, Oman, and The cities of Alexandria and historic Cairo, Egypt, where the study is based on the analysis of the vocabulary of the facades of those New buildings are compared to the same vocabulary as the old façades of the original style.
Architectural style
Heritage Area
New buildings in heritage areas
2020
07
01
714
748
https://jesaun.journals.ekb.eg/article_112440_394946ae600d787e887ed44bcc9c7b56.pdf