Assiut University, Faculty of Engineering
JES. Journal of Engineering Sciences
1687-0530
2356-8550
39
No 4
2011
07
01
EFFECT OF USING METALLIC AND NON METALLIC - FIBER AND RIB GEOMETRY OF STEEL BARS ON BOND STRENGTH FOR HIGH STRENGTH CONCRETE (H. S. C.)
681
696
EN
Aly Abdel-Zaher
ELsayed
Civil Engineering Department, Faculty of Engineering, Assuit University
Assiut, Egypt.
Hosny M.
Soghair
Civil Engineering Department, Faculty of Engineering, Assuit University
Assiut, Egypt.
Mohamed M.
Rashwan
Civil Engineering Department, Faculty of Engineering, Assuit University
Assiut, Egypt.
Ali Mohamed Abdallah
Abou-Zied
Engineer in the general Authority of Educational Buildings Sohag, Egypt
10.21608/jesaun.2011.127691
The need of high strength concrete (H. S. C.) is increasing in the recent<br />years. This material becomes necessary, but it is brittle .So, metallic<br />fibers are used to enhance composite properties of (H. S. C.).The<br />enhanced properties include tensile strength, compressive strength,<br />elastic modulus, crack resistance, crack control, durability, fatigue life,<br />resistance to impact and abrasion, shrinkage, expansion, thermal<br />characteristics, and fire resistance of concrete .There is little information<br />in the available literature about the bond characteristics for the different<br />forms of rib geometry of the deformed bars on the strength between steel<br />and high-strength fiber-reinforced concrete for different relative rib<br />areas and fibers types .<br />The main objective of this research is to study the effect of using Metallic<br />and Non Metallic- Fiber and rib geometry of steel bars on bond strength<br />for high strength concrete (H. S. C.). Also Pattern of cracks, final mode<br />of failure and deformational characteristics (direct slip for pull-out)<br />were investigated.
https://jesaun.journals.ekb.eg/article_127691.html
https://jesaun.journals.ekb.eg/article_127691_0f219579f15a4b7273cf13d840f53364.pdf
Assiut University, Faculty of Engineering
JES. Journal of Engineering Sciences
1687-0530
2356-8550
39
No 4
2011
07
01
OPTIMIZATION AND UPGRADING WASTEWATER TREATMENT PLANTS
697
713
EN
Mahmoud A.
El-Sheikh
Sanitary & Env. Eng., Menoufiya University, Shebeen Elkom, Egypt,
mshafy2@yahoo.com
10.21608/jesaun.2011.127692
Aging of wastewater treatment plants (WWTPs) reduces their efficiency<br />and their treated effluent quality while it increases standards of safety,<br />health and environmental protection to preserve our quality of life.<br />Therefore, upgrading and optimization out of date WWTPs is essential to<br />meet new standards within an economically responsible and<br />environmentally sustainable framework. This paper reviews the most<br />common wastewater treatment processes and their constrains that could<br />need for upgrading. Also, it establishes procedures for optimizing and<br />upgrading existing WWTPS including systematic approaches to find out<br />the capacity and performance of existing processes, to determine the<br />places of constrains, to put alternatives for overcoming limitations and<br />evaluating different alternatives and to select the most suitable and costeffective<br />for different kinds of processes. WWTPs in Alexandria and<br />Damietta governorates, Egypt, have been studied for upgrading the<br />existing situation and increase their treatment capabilities.
Process limitations,Upgrading wastewater treatment,plant optimization,treatment capacity
https://jesaun.journals.ekb.eg/article_127692.html
https://jesaun.journals.ekb.eg/article_127692_783093da860569d05877bb3d36ef49a7.pdf
Assiut University, Faculty of Engineering
JES. Journal of Engineering Sciences
1687-0530
2356-8550
39
No 4
2011
07
01
CONTRIBUTION OF SOIL-STRUCTURE INTERACTION TO SEISMIC RESPONSE OF BUILDINGS
715
750
EN
Hamdy H. A.
Abd el-Rahim
Associate Professor, civil engineering department, Faculty of
Engineering, Assiut University
hamdy010@yahoo.com
Ahmed Abd El-Raheem
Farghaly
Lecturer, Faculty of Industrial Education, Sohag University
10.21608/jesaun.2011.127696
Buildings are susceptible to soil structure interaction effects due to the<br />induced changes in the dynamic characteristics of soil during seismic<br />excitation; particularly several buildings have been constructed on soft<br />soil. Because of this detrimental effect, this paper aims at clarifying the<br />soil structure interaction effect on the seismic response of buildings<br />under strong ground motions to provide damage control and enhance the<br />safety level of such buildings. An iterative dynamic analysis was<br />performed using SAP2000 program to carry out three dimensional time<br />history analysis of non-linear soil-foundation-building models under a<br />great earthquake ground motions. The interaction between the soil and<br />structure is represented by Winkler spring model and the damping effect<br />of the soil is modeled by dashpots. The coefficients of springs and<br />dashpots were based on medium soil profile underneath and along the<br />embedded depth of foundation and calculated as recommended by<br />Newmark and Rosenblueth 1971 [23].<br />A comparison of response for different building models subjected to<br />three dimensional great earthquake ground motion shows that<br />incorporating the soil structure interaction could have a detrimental<br />effect on the building performance and overestimates the top < br />displacements response. On the contrary flexible bases of buildings have<br />noticeable effect on the structural behavior of buildings by providing<br />pronounced reduction in the internal forces of superstructure response<br />compared to the fixed base buildings. Also, the obtained results<br />confirmed that the dynamic characteristics of soil structure system<br />should be recommended for conservative nonlinear seismic response of<br />the high building since it mitigates of earthquake hazards.
buildings,soil-structure interaction,Flexible bases,Fixed base,Three dimensional Ground motions,seismic response,Time history analysis
https://jesaun.journals.ekb.eg/article_127696.html
https://jesaun.journals.ekb.eg/article_127696_732268aa64cd940d0a7c317c59cfd098.pdf
Assiut University, Faculty of Engineering
JES. Journal of Engineering Sciences
1687-0530
2356-8550
39
No 4
2011
07
01
BOND CHARACTERISTICS AND ROTATIONAL CAPCITY FOR REINFORCED CONCERETE EXTERIOR JOINTS AS AFFECTED BY BONDED PART AND RIB GEOMETRY FOR STEEL REINFORCEMENT BARS
751
760
EN
Mahmoud
Hussien
Ahmed
Civil Eng. Departement, Faculty of Eng., Assiut University, Assiut, Egypt,
Aly
Gamal
Aly
Civil Eng. Departement, Faculty of Eng., Assiut University, Assiut, Egypt
Aly
M.
Abd-Allah
Engineer in the Educational Authority, Sohag, Egypt.
10.21608/jesaun.2011.127701
The need of high quality of concrete is increased in the recent years.<br />Using steel of high grade and maximize the benefit of using this steel<br />became necessary. So, different ribs are used for steel bars to increase<br />the bond strength between steel reinforcement and concrete. There are<br />different forms of rib geometry of I he deformed bars with either<br />Crescent or Tree profiles for all types of steel in the Egyptian market.<br />Anchorage of reinforcing bars of the beam-column connections is an<br />important design consideration for providing continuity and safety m<br />reinforced concrete structures. This anchorage may be provided by<br />development of straight bars into the exterior joints,<br />The Egyptian Codes of practice 208 (1995) [1] and 203 (2001) [2] give<br />the values of development length of the deformed reinforcement bars<br />regardless the geometry and the relative area of the ribs.<br />The main objectives of this research is to study the effect of the rib<br />geometry and the relative rib area on the bond characteristics, the<br />rotational capacity, crack pattern, the mode of failure, the deformation<br />capacity and bond stress of the exterior joints of the structure.<br />Six specimens of cantilever-to-column connections, which represent<br />exterior joints in structural system, were tested. Type of steel, rib<br />geometry, and bonded part were variables in the tested specimens.<br />The study concluded that the geometry of the ribs and the bonded part in<br />addition to the steel type have reasonable effect on the bond<br />characteristics of the cantilever-to-column joints and hence on the<br />ultimate load capacity of the joint
https://jesaun.journals.ekb.eg/article_127701.html
https://jesaun.journals.ekb.eg/article_127701_d996d44d4cf4e8180f55a85f4cd5d44b.pdf
Assiut University, Faculty of Engineering
JES. Journal of Engineering Sciences
1687-0530
2356-8550
39
No 4
2011
07
01
MATHEMATICAL STRUCTURAL ANALYSIS OF ONE WAY RIBBED SLABS
761
780
EN
M. H.
Ahmed
Professor at civil En. Dept., Faculty of Eng., Assiut University
Y. A.
Hassaneen
Professor at civil En. Dept., Faculty of Eng., Assiut University
Z. E.
Abd El Shafy
Lecturer, Civil Eng. Dept., Assiut University.
M. A.
Farouk
Engineer Expert in Ministry of justice.
10.21608/jesaun.2011.127702
Mathematical structural analysis of one way ribbed slabs was introduced<br />in this paper. The results of this analysis are compared with the results of<br />the finite element method by SAP program. In SAP program, the model<br />has been divided to frame elements "to represent ribs and beams" and<br />shell elements "to represent the slab and solid part". Before using the<br />SAP program to compare the results with the mathematical model, the<br />results of the SAP program are evaluated by three dimension analysis<br />through ANSYS program. The suggested mathematical analysis in this<br />work was more accurate than the traditional method and gives close<br />values of the induced moments of the ribs compared with the results of<br />finite element method.
https://jesaun.journals.ekb.eg/article_127702.html
https://jesaun.journals.ekb.eg/article_127702_0fde3a0c49798ecc7684534c82cbf4b4.pdf
Assiut University, Faculty of Engineering
JES. Journal of Engineering Sciences
1687-0530
2356-8550
39
No 4
2011
07
01
DEVELOPING A BASE INDEX FOR ENVIRONMENTAL ASSESSMENT OF COASTAL RESORT PROJECTS ALONG RED SEA COAST OF THE CITY OF JEDDAH
781
794
EN
Mohammad
Abdul Rahman
Kattan
Project Director for Girls Faculties, King Abdul Aziz University,
Kingdom of Saudi Arabia
Mahmoud A.
Taha
Associate Professor, Civil Engineering Department, Construction
Management Program, King Abdul Aziz University, on leave from
Structural Engineering Department, Cairo University, Egypt.
Abdullah
Mostafa
Mohorjy
Professor of Water Resources & Environmental Engineering, King
Abdul Aziz University, Kingdom of Saudi Arabia
10.21608/jesaun.2011.127704
The decision for approving Environmental Impact Assessment (EIA) is<br />complex due to data uncertainty related to inability to collect the<br />required data sets on existing baseline conditions. The current practice<br />of EIA implementation in the city of Jeddah, Kingdom of Saudi Arabia<br />(KSA), is conducted without a base index for the evaluation of project<br />alternatives and proposals.<br />This paper attempts to propose a systematic procedure used for<br />developing a base index for the city of Jeddah that employs the expertise<br />of a domain expert in the field of EIA for coastal resort projects to<br />operate the fuzzy logic approach. This technique handles uncertainty and<br />offers a practical solution to the evaluation of environmental impacts<br />that express the quantitative threshold and represent qualitative values<br />inherited in EIA decision process. In this paper, 30 input variables and<br />10 indicators are considered in the assessment of the existing baseline<br />conditions for the city of Jeddah.
Environmental Impact Assessment (EIA),Baseline Conditions,uncertainty,Fuzzy Logic,Quantitative Impacts,Qualitative Impacts
https://jesaun.journals.ekb.eg/article_127704.html
https://jesaun.journals.ekb.eg/article_127704_26094d9badd42abff1d51e4e29622b0c.pdf
Assiut University, Faculty of Engineering
JES. Journal of Engineering Sciences
1687-0530
2356-8550
39
No 4
2011
07
01
SEISMIC BEHAVIOR OF CONCRETE SHEAR WALL – FRAMES - STRUCTURAL SYSTEMS SUBJECTED TO EARTHQUAKE LOADS
795
809
EN
Fadwa
Issa
Department of Structural Engineering Faculty of Civil Engineering, Damascus University
fadwa.issa650@gmial.com
Mohamad Nazih Alyagchi
Eilouch
Department of Structural Engineering Faculty of Civil Engineering, Damascus University
nazihayagchi@gmail.com
Abbas
Tasnimi
Department of Structural Engineering International Institute of Earthquake Engineering and Seismology (IIEES), Iran
tasnimi@gmail.com
10.21608/jesaun.2011.127709
In most designing cases, design engineers assign shear walls the total<br />seismic loads while the frames (columns and beams) take the gravity<br />loads. This procedure imposes additional seismic loads on the buildings;<br />moreover the Syrian Code requires the application of the requirements<br />related to seismic resistance on the frame elements (columns, beams and<br />joints). This design procedure raises two basic issues. The first is the<br />complete elimination of the frame effect on shear walls behavior<br />regarding the internal forces and deformations. The second is the effect<br />of the shear walls on the moment resisting frames behavior. In this study,<br />the mutual effect of each system on the other is called interaction.<br />These systems are being studied by formulating several mathematical<br />models covering buildings with shear walls and frames that have<br />different heights and walls stiffness, expanding over a range of high and<br />low stiffness values relative to the total stiffness of the building. Linear<br />static and dynamic analyses have been applied on these models to show<br />the possible contribution of frames in the performance of the building in<br />terms of internal forces and deformations. This study also focuses on the<br />nonlinear behavior of shear wall-frame structural system by using<br />nonlinear pushover analysis.<br />At the end of this study, the most important results and recommendations<br />are summarized, especially the necessity of considering the interaction<br />between frames system and shear walls system. Increasing structural<br />system factor is recommended when seismic loads are calculated. This<br />leads to a reduction in the seismic loads on buildings.
shear wall-frame systems,nonlinear pushover analysis
https://jesaun.journals.ekb.eg/article_127709.html
https://jesaun.journals.ekb.eg/article_127709_549fb1a86ba61881567902a12173f60b.pdf
Assiut University, Faculty of Engineering
JES. Journal of Engineering Sciences
1687-0530
2356-8550
39
No 4
2011
07
01
BEHAVIOR AND DURABILITY OF HIGH AND ULTRA HIGH STRENGTH CONCRETE MANUFACTURED BY LOCAL MATERIALS
811
826
EN
Walid
Safwat
El- Sayed
Associate Professor, Suez Canal University, Suez, Egypt
Dina M.
Sadek
Researcher, Housing and Building National Research Center, Giza, Egypt
Basuoni Ibrahim
Al- Samahy
Department of Civil and Architectural construction, Suez Canal
University, Egypt
10.21608/jesaun.2011.127712
Concrete has undergone rapid and phenomenal development in recent<br />decades. Today, new classes of concretes (i.e., high strength, very high<br />strength and ultra high strength concretes) has been manufactured and<br />transferred from laboratory research to practical application. These<br />concretes are used increasingly and replaced normal strength concrete in<br />many structural applications. Although the mechanical properties and<br />durability of normal strength concrete has been well evaluated, these<br />properties of the new classes of concretes as well as the relationship < br />between the compressive strength and other mechanical properties as well<br />as the durability of concrete are not well identified.<br />In this paper, different classes of concrete with a wide range of<br />compressive strength (250 to 1000 kg/cm2) are manufactured using local<br />materials and their mechanical properties as well as their durabilityrelated<br />properties are determined. Furthermore, the mathematical<br />relationships between the compressive strength and other properties are<br />developed using statistical methods.<br />The experimental results showed that it is possible to produce concrete<br />with compressive strength in excess of 1000 kg/cm2 using local materials<br />in Egypt. Furthermore, the suggested mathematical equations can be used<br />to derive the properties of concrete based on its compressive strength.
Compressive strength,High strength concrete,Very high strength concrete,Ultra High Strength Concrete,Mechanical Properties,Durability
https://jesaun.journals.ekb.eg/article_127712.html
https://jesaun.journals.ekb.eg/article_127712_15f0e1f506d53dcb9578f775416b0253.pdf
Assiut University, Faculty of Engineering
JES. Journal of Engineering Sciences
1687-0530
2356-8550
39
No 4
2011
07
01
APPARENT VISCOSITY MIXING INDEX USING CFD COMPUTATIONS FOR NON-NEWTONIAN FLUIDS USING HELICAL RIBBON IMPELLER
827
838
EN
A.A.
Rsheed
Mechanical power engineering dept. Faculty of engineering, Ain Shams University
Y.S.
Fangary
Mechanical power engineering dept. Faculty of engineering, Ain Shams University
N.A.
Mahmoud
Mechanical power engineering dept. Faculty of engineering, Ain Shams University
10.21608/jesaun.2011.127720
In the present study a mixing index was proposed in order to characterize<br />mixing processes of non Newtonian fluids. The apparent viscosity in a<br />mixing tank equipped with helical ribbon impeller was computed using a<br />CFD package. The symmetry plane of the mixing tank was divided into<br />sixteen zones where an average apparent dimensionless viscosity was<br />calculated to each of these zones from which a mixing index was evaluated.<br />The mixing index showed to increase with impeller rotational speed,<br />impeller/tank diameter ratio and showed to be affected by the rheological<br />parameters of the agitated fluid. The computed data of the mixing index<br />were correlated as a function of impeller/tank diameter ratio, impeller<br />rotational speed and rheological parameters. The proposed correlation<br />deviated from computed data by a maximum deviation of ± 50%.
https://jesaun.journals.ekb.eg/article_127720.html
https://jesaun.journals.ekb.eg/article_127720_fce2729798b44bb97275e4c1add7370d.pdf
Assiut University, Faculty of Engineering
JES. Journal of Engineering Sciences
1687-0530
2356-8550
39
No 4
2011
07
01
CO-COMBUSTION OF RICE HUSK AND SINAI COAL IN CIRCULATING FLUIDIZED BED
839
852
EN
Hamada M.
Abdelmotalib
Department of Mechanical Power Engineering and Energy, Faculty of
Engineering, Minia University, Egypt
Mahmoud A. M.
Youssef
Department of Mechanical Power Engineering and Energy, Faculty of
Engineering, Minia University, Egypt
Ibrahium M
El-Mogazy
Department of Mechanical Power Engineering and Energy, Faculty of
Engineering, Minia University, Egypt
10.21608/jesaun.2011.127721
Rice husk is one of the most important agricultural residues in Egypt. The<br />present study introduces an experimental investigation on circulating<br />fluidized bed (CFB) combustion of rice husk and co-combustion of rice<br />husk and Egyptian (Sinai) coal. The test rig is a pilot scale CFB<br />combustor of 145 mm inner diameter, 2 m tall and 100 kW thermal<br />capacity. The influences of excess air, and coal share were studied.<br />Temperature and heat flux along the reactor height, in addition to the<br />concentrations of CO, NOx and SO2 in the flue gas out from cyclone were<br />measured. The combustion efficiency was estimated based on CO and<br />unburned char in flue gas. The highest efficiency recorded for rice husk<br />combustion was 98% at excess air ratio (EA) = 1.1 and secondary air ratio<br />(SAR) = 50%. Co-combustion of Sinai coal and rice husk reduced CO but<br />increased SO2 and NOx emissions. The results suggest that rice husk is<br />potential fuel that can be utilized for efficient and renewable energy<br />production by using CFB combustion system especially at co-combustion<br />with coal.
https://jesaun.journals.ekb.eg/article_127721.html
https://jesaun.journals.ekb.eg/article_127721_0843d79530bcad259cf24d4065c8b16e.pdf
Assiut University, Faculty of Engineering
JES. Journal of Engineering Sciences
1687-0530
2356-8550
39
No 4
2011
07
01
A MODEL FOR ELECTRICAL TREEING IN EPOXY NANOCOMPOSITE INSULATING MATERIALS
853
869
EN
A.
Thabet
Aswan, Nanotechnology Research Centre NTRC, High Institute of Energy,
South Valley University, Aswan, Egypt
10.21608/jesaun.2011.127716
Electrical treeing is a pre-breakdown mechanism, and is the responsible<br />for the long-term degradation of polymer insulation. This paper has been<br />enhanced both the life-time of tree propagation to breakdown and the<br />tree growth rate of electrical tree propagation by adding various<br />amounts of nanoparticles as Clay, Silica, ZnO, and Al2O3 to various<br />industrial materials CT200 Epoxy Resin, and LY/HY-5052 Epoxy Resin.<br />This research has focused on the development of nanocomposite<br />materials with electrical tree growth resistance superior to the unfilled<br />matrix, and has stressed particularly the effect of filler volume fraction<br />on the breakdown resistance. Finally, this research aims to present a<br />systematic and comparative study about the effect of adding<br />nanoparticles to dielectric insulation, and to understand the role of these<br />nanoparticles, Clay, Silica, ZnO, and Al2O3 particles in the CT200<br />Epoxy Resin and LY/HY-5052 Epoxy Resin which can made significant<br />improvement in breakdown resistance, life-time of insulation and<br />decreasing the tree growth rate of electrical tree propagation.
Electrical Treeing,Life-time,Tree Propagation,Nanocomposite materials,dielectric insulation,Nanoparticles
https://jesaun.journals.ekb.eg/article_127716.html
https://jesaun.journals.ekb.eg/article_127716_ec4527737d2d60301e6062997317df5d.pdf
Assiut University, Faculty of Engineering
JES. Journal of Engineering Sciences
1687-0530
2356-8550
39
No 4
2011
07
01
IMPLEMENTATION OF SPACE VECTOR-PWM FOR DRIVING TWO LEVEL VOLTAGE SOURCE INVERTERS
871
884
EN
Mahmoud
Gaballah
Dept. of industrial electronics & control engineering
Faculty of Electronic Engineering, Minufiya University, 32852, Egypt
Mohammed
El-Bardini
Dept. of industrial electronics & control engineering
Faculty of Electronic Engineering, Minufiya University, 32852, Egypt
Soliman
Sharaf
Dept. of industrial electronics & control engineering
Faculty of Electronic Engineering, Minufiya University, 32852, Egypt
Mohammed
Mabrouk
Dept. of industrial electronics & control engineering
Faculty of Electronic Engineering, Minufiya University, 32852, Egypt
10.21608/jesaun.2011.127717
This paper presents an implementation of space vector pulse width<br />modulation signal generation for driving three phase voltage source<br />inverter. The SVPWM technique gets the PWM switching times for<br />the inverter legs directly from the sampled amplitudes of the<br />reference phase voltages. The SVPWM switching strategy is based on<br />the right aligned sequence. This method is much simpler and more<br />executable than conventional means without look-up tables or<br />complex logical judgments. The SVPWM scheme is<br />modeled/simulated using MATLAB SIMULINK software package,<br />and experimentally implemented / verified on the low cost microchip < br />8 bit microcontroller PIC16F747 platform. The experimental results<br />are presented for three phase two-level inverter followed by three<br />phase output LC filter.
https://jesaun.journals.ekb.eg/article_127717.html
https://jesaun.journals.ekb.eg/article_127717_d41d8cd98f00b204e9800998ecf8427e.pdf
Assiut University, Faculty of Engineering
JES. Journal of Engineering Sciences
1687-0530
2356-8550
39
No 4
2011
07
01
IMPROVING THE QALITY OF PETROLEUM CRUDE OILS BY DEASPHALTING
885
896
EN
Shazly M.
Salem
Suez Canal University, Faculty of Petroleum & Mining Engineering,
Petroleum Refining and Petrochemical Engineering Department, Suez,
Egypt
Galal M.
Abdelaleem
Suez Canal University, Faculty of Petroleum & Mining Engineering,
Petroleum Refining and Petrochemical Engineering Department, Suez,
Egypt
Nadia A.
Elsayed
Suez Canal University, Faculty of Petroleum & Mining Engineering,
Petroleum Refining and Petrochemical Engineering Department, Suez,
Egypt
Walaa Osman
Saad
Suez Canal University, Faculty of Petroleum & Mining Engineering,
Petroleum Refining and Petrochemical Engineering Department, Suez,
Egypt
10.21608/jesaun.2011.127722
The heavy crude oils usually contain considrable amounts of<br />asphaltenes. The high asphaltene contents in the crude oils would<br />decrese the efficiency of the refining processes. Moreever, the high<br />distribution of hetero-atoms (e.g. sulfur and nitrogen) in the asphaltene<br />causes some problems such as pollution, corrosion and catalyst<br />poisining. The main object of this contribution is to investigate the effect<br />of the deasphalting process of crude oils in the sake of improving its<br />properties and consequently increasing the efficiency of the refining<br />processes.<br />Solvent extraction experiments using n-heptane as a solvent were<br />conducted on three types of Egyptian heavy crude oils (Asran, Land<br />Balayim and Geisum), these tests were also performed on three blends<br />from these three crudes with different proportions.<br />The experimental results illustrate that deasphalting process leads to<br />improve some key properties of crudes such as API gravity, viscosity,<br />pour point, total sulfur content, and carbon residue.
https://jesaun.journals.ekb.eg/article_127722.html
https://jesaun.journals.ekb.eg/article_127722_6b4d8cab89ddd442beffca7a50edd370.pdf
Assiut University, Faculty of Engineering
JES. Journal of Engineering Sciences
1687-0530
2356-8550
39
No 4
2011
07
01
SANA’A URBAN TRANSFORMATION: FROM WALLED TO FRAGMENTED CITY
897
918
EN
Abdullah
Al-Abed
Department of Architecture, Faculty of Engineering, Sana'a University,
YEMEN
dr_alabed92@yahoo.com
10.21608/jesaun.2011.127724
The recent rapid uncontrolled urban transformation of Sana’a city is a<br />significant example of the historic core of most Arab cities with regard to<br />its formation, growth and development. Sana'a city has expanded from<br />merely 3.7 square kilometers in 1962 to more than 1,600 square<br />kilometers at the end of the 2010.<br />When El-Sheshtawy (2004) presented the evolution of Arab cities, Sana’a<br />city was discussed under “the cities affected by globalization<br />phenomenon”. That has had an extremely uneven impact on Sana’a.<br />When Sana’a compared to the cities in the region, globalization is not<br />necessarily a central issue for Sana’a city. In fact Sana'a shares the<br />fragmentation phenomenon with the rest of the cities in the region. This<br />is the point from where this paper starts.<br />The approach of this paper is based on both diachronic and synchronic<br />readings of the historical and new city. It will discuss:<br />· Urban transformation approaches.<br />· Phases of Sana'a urban form fragmentation.<br />This research pinpoints the current spatial and environmental problems<br />facing the new and the old urban fabric as consequences of urban form<br />fragmentation. Though it doesn’t aim to reach conclusive results, the<br />study hoped to provide a conceptual background for the present debate<br />on city's urban future.
urban transformation,urban fragmentation,historical walled gated city,new urban fabric
https://jesaun.journals.ekb.eg/article_127724.html
https://jesaun.journals.ekb.eg/article_127724_9c77583d3097e94d0cf7f0396bf481b9.pdf
Assiut University, Faculty of Engineering
JES. Journal of Engineering Sciences
1687-0530
2356-8550
39
No 4
2011
07
01
Vision for Architecture, Urbanism and Culture in Globalization Era
919
932
EN
Mohammed
Mostafa
hamshary61@gmail.com
10.21608/jesaun.2011.127725
Culture model reflects the nation's identity and national character and<br />civilization, and the play of Architecture and Built an active role in the<br />formation of a part of this culture has been confirmed by historical<br />documents that culture, architecture and construction issues directly<br />related to the culture of human societies. Hence we conclude that they have<br />an important role in the promotion of our cultural identity and our<br />national character to the challenges facing our nation today in ways and<br />various forms, including globalization, the format, and cultural<br />globalization as private paint an outline from which the personal, you may<br />try globalization imposed by the culture that summarize the personal and<br />particular within the framework of attempts to control the world in all<br />fields, and we must protect our individuality and cultural awareness and<br />deepen the culture of resistance and expanded to include all aspects of<br />culture and the spectrum and components, construction and architecture of<br />the most important of these components. Truth that must draw attention to<br />her that globalization is not something new came up with the contemporary<br />revolution in communications and information. It started since I entered<br />the modern Europe, or produced at the end of the fifteenth century and<br />accelerated with the Industrial Revolution in the eighteenth century and<br />has become a reality with the third technological revolution in the<br />twentieth century. The difference is the speed at which globalization takes<br />place and the extent of their impact on local entities, whether cultural or<br />economic or political. But the question is important and existential us what<br />is our destiny and the fate of our building especially in light of the<br />globalization, which seems to be nothing can stand in its way?<br />What is the destiny of our identity and our culture and our history of self<br />and what is our position in what is going on? If we look to the future,<br />technology will have an impact on the largest and most important land-use<br />change and features of architectural and urban design. Where it has<br />become possible to access information and communicate with people at a<br />distance without any need for physical presence in space and spatial<br />himself and without adherence to the time and without limits. And<br />information and communication technology used in the beginning of a<br />revolution of information and communication technologies to enhance the<br />performance of the institutions began to change in land use and urban and<br />Architecture Design.
https://jesaun.journals.ekb.eg/article_127725.html
https://jesaun.journals.ekb.eg/article_127725_4e75e733c590202e6965fdbd771e07cd.pdf