2024-03-29T07:49:06Z
https://jesaun.journals.ekb.eg/?_action=export&rf=summon&issue=16861
JES. Journal of Engineering Sciences
1687-0530
1687-0530
2016
44
No 5
IRREGULARITY EFFECTS ON THE SEISMIC PERFORMANCE OF L-SHAPED MULTI-STORY BUILDINGS
Momen M. M.
Ahmed
Shehata E
Abdel Raheem
Mohamed M.
Ahmed
Aly G A
Abdel Shafy
Past and recent earthquakes events demonstrate that buildings with configuration irregularity are more vulnerable to earthquake damages. So it's essential to investigate the seismic response of these structures in active seismic zones to reduce the potential seismic damages. The configuration irregularities introduce major challenges in the seismic design of building structures. One such form of irregularity is the presence of re-entrant corners that causes stress concentration due to sudden changes in stiffness and torsion amplification in the buildings; hence causes early collapse. This, the conventional design codes have not recommendations for proper evaluation of these buildings yet. Thus, a constructive research into re-entrant corner irregularity problems is essentially needed greater than ever. The objective of this study is to grasp the seismic behavior of the buildings with irregular plan of L-shape floor plan through the evaluation of the configuration irregularity of re-entrant corners effects on measured seismic response demands. The measured responses include inter-story drift; story shear force; overturning moment; torsion moment at the base and along the building height; top floor displacement; and torsional Irregularity Ratio. Three dimensional finite element model of nine stories moment resisting frame buildings as reference model is developed; six L-shaped models are formulated with gradual reduction in the plan of the reference model. The models are analyzed with ETABS using Equivalent Static Load (ESL) and Response Spectrum (RS) Methods. The results prove that buildings with severe irregularity are more vulnerable than those with regular configuration resulting from torsion behavior, and the additional shear force produced in the perpendicular direction to the earthquake input. Also, in the codal empirical equation for the calculation of fundamental period of vibration could not grasp significant higher vibration modes such as torsional vibration of irregular buildings that could significantly affect seismic demands.
Configuration Irregularity
L-shaped Buildings
Seismic demands
Torsional Irregularity Ratio
2016
09
01
513
536
https://jesaun.journals.ekb.eg/article_111440_76830a745aacec22889e432b2ef2e2f3.pdf
JES. Journal of Engineering Sciences
1687-0530
1687-0530
2016
44
No 5
EFFECT OF USING HIGHLY CONFINED SHORT LAP-SPLICE REINFORCEMENT ON SEISMIC PERFORMANCE OF EXTERIOR BEAM-COLUMN JOINT
Girgis F.G.
Sharobeem
Mohamed F. M.
FAhmy
Omar A.
Farghal
The present paper aims to examine the behavior of exterior beam-column joints with different reinforcement details of their columns: continuous and lap splice longitudinal bars were adopted as design parameter. The experimental program was carried out at the Concrete Research Laboratory at Housing and Building Research Center in Egypt; included three exterior reinforced beam column joints that were tested under the effect of quasi-static cyclic loading. One sample was designed according to the provisions of the current seismic design codes and served as a control sample. Columns of the other two samples were detailed with well confined shorter lap spliced longitudinal reinforcement. The overall behavior of the beam-column joints and conclusions are discussed in this paper.
Lap-splice
beam-column
confined
exterior joint
Seismic
2016
09
01
502
512
https://jesaun.journals.ekb.eg/article_117614_19526d856b1e1371b3957eae268343d3.pdf
JES. Journal of Engineering Sciences
1687-0530
1687-0530
2016
44
No 5
JOINT COMPRESSIVE SENSING FRAMEWORK FOR SPARSE DATA/CHANNEL ESTIMATION IN NON-ORTHOGONAL MULTICARRIER SCHEME
Mostafa
Salah
Osama A.
Omer
Usama
Sayed Mohammed
Many wireless channel behavior exhibits approximate sparse modeling in time domain, therefore compressive sensing (CS) approaches are applied for more accurate wireless channel estimation than traditional least squares approach. However, the CS approach is not applied for multicarrier data information recovery because the transmitted symbol can be sparse neither in time domain nor in frequency domain. In this paper, a new Sparse Frequency Division Multiplexing (SFDM) approach is suggested to generate sparse multicarrier mapping in frequency domain based on the huge combinatorial domain. The subcarriers will be mapped in sparse manner according to data stream for taking advantages of multicarrier modulation with lower number of subcarriers. The number of activated subcarriers is designed to achieve the same as Orthogonal Frequency–Division Multiplexing data rate under lower signal-to-noise ratio. The proposed approach exploits the double sparsity of data symbol in the frequency domain, and channel sparsity in the time domain. The same CS approach for both data recovery and adaptive channel estimation in a unified sparsely manner is used. The suggested framework can be used with any non-orthogonal waveform shaping and can work efficiently without any prior information about neither the channel sparsity order nor searching for the optimum pilot patterns.
Compressive Sensing
sparse channel estimation
Super-resolution
non-orthogonal waveforms
sparse frequency division multiplexing (SFDM)
combinatorial sparsifying
2016
09
01
537
554
https://jesaun.journals.ekb.eg/article_117615_cd926808a00e5be939e420b749ced657.pdf
JES. Journal of Engineering Sciences
1687-0530
1687-0530
2016
44
No 5
DEVELOPMENT OF DYNAMIC MODEL FOR VIBRATION CONTROL OF FLEXIBLE BEAM
Mark
Adel
Khalil
Ibrahim
Abdel-Rassoul
Gad
Abo El-Makarem
Khalil
The present study aims at developing a new dynamic model for vibration control of a composite carbon cantilever beam. The finite element method (FEM) is used to derive the introduced model. Modal analysis is performed on the cantilever beam using ANSYS software package and results were compared with similar published work using ABAQUS software package to validate the results obtained from ANSYS. The theory behind the extraction of flexible beam model from the finite element model is introduced. The eigenvalues and eigenvectors resulting from this analysis are integrated into MATLAB, which is used to derive the state space model of the system. Through MATLAB/ SIMULINK tools a PID controller was designed and controlled system performance under different system inputs is studied to test the efficiency of the controller. The results show similar responses and similar error percentage signals to various step input angles. In addition, the system shows a good performance to sine wave input signal despite the presence of a minor lag.
dynamic model
Finite Element
Modal analysis
ANSYS
MATLAB
2016
09
01
555
565
https://jesaun.journals.ekb.eg/article_117616_469ae3c699af6e4a1785c9be8bb271d6.pdf
JES. Journal of Engineering Sciences
1687-0530
1687-0530
2016
44
No 5
EXPERIMENTAL STUDY FOR DISPERSION AND ATTENUATION CORRECTION IN VISCOELASTIC SPLIT HOPKINSON PRESSURE BAR ARRANGEMENT
Reda M.
Othman
Wael M.
Khier
Abu-bakr A.
Naser
Split Hopkinson pressure Bar (SHPB) arrangement is the most practical and accurate method for studying dynamic mechanical behavior of materials under high strain rate. However in case of studying foams, and soft tissues (low impedance materials) a modified version of SHPB with bars made from a viscoelastic material like Poly methyl methacrylate PMMA acrylate is commonly used .so a good prediction of the stress waves and particle velocity acting at the interface between bars and specimen taking into account the dispersion and attenuation effect is essential. In this study the wave propagation coefficient as a function of the phase velocity and the attenuation coefficient in relation to the frequency are calculated experimentally by a set of free end bar tests using a cylindrical projectile to the circumstances of stepped velocity and different firing pressure. Correction processes for longitudinal stains related to incident and reflected waves are preceded in frequency domain using Fast Fourier Transformer (FFT) technique.
Split Hopkinson pressure Bar (SHPB)
viscoelastic
dispersion
attenuation coefficient
2016
09
01
566
576
https://jesaun.journals.ekb.eg/article_117617_9a3bde492ad80533f4e56edaab7d24d4.pdf
JES. Journal of Engineering Sciences
1687-0530
1687-0530
2016
44
No 5
DESIGN STRATEGIES OF RECONFIGURE EXISTING PATIENT ROOMS TO CONFORM WITH ENVIRONMENTAL SAFETY STANDARDS AN APPLIED STUDY AT THE ONCOLOGY CENTER, MANSOURA UNIVERSITY
Heba Mohamed Ahmed
Abdou
Sherif Ahmed Ali
Sheta
Wael Seddik Abdelatif
Moustafa
The main aim of (establishing Environmental remedies) is healing and recovery of illnesses and getting rid of pains. If the patient got infected with diseases or exposed to dangers inside the hospital, this is considered a demolition of the main aim of establishing this hospital, so we must keep a safe environment, and Hospital design helps the safety of the patient directly through the reduction of transmission of infection or reducing the falling of patients, Or indirectly to the reduction of the noise, which may cause medical errors, Etc, The research focuses on patient's rooms, where a patient spends most of the time in the hospital inside the patient's room. The study concludes in determining the principles and criteria of achieving the environmental safety of the patient's rooms, with the need to integrate those standards in the design and development of patient's rooms in hospitals because of their role in reducing the possible risk of occurrence for patients. Accessible to those principles has been study some research studies to a strategy design of patient's rooms, and try to gain access to suitable design of the patient's rooms in accordance with environmental safety standards and the study of the internal environment of the room design, By defining design bases that help to reduce the transmission of infection, and standards for security and safety, as well the work of an applied complementary study to research study the theoretical to study the possibility of practical application of the standards of environmental safety patient's rooms general and specialized hospitals, with the review of most important reasons for choosing the sample under study.
2016
09
01
577
602
https://jesaun.journals.ekb.eg/article_117618_a9d83af4e9ebd2185e2efe55b6a9b0fb.pdf
JES. Journal of Engineering Sciences
1687-0530
1687-0530
2016
44
No 5
THE REFLECTION OF ENVIRONMENTAL AND SOCIAL ASPECTS ON THE DESIGN AND FORMATION OF OUTDOOR CIRCULATION ELEMENTS IN HERITAGE TOWNS CASE STUDY: AL-ULA HERITAGE TOWN – KINGDOM OF SAUDI ARABIA
Wael Hussain
Youssef
The research discusses the possibility to benefit from heritage concepts rooted in ancient urban areas, with all its values which were a true and expressive interaction between the environment and its human, social, natural, climatic characteristics. The circulation issue in architecture and urbanism is currently referring only to functional concept, ignoring many natural, social factors of the surrounding context. Many of rich treatments that characterized the heritage urbanism are now absent. Trying to get benefit from these values and concepts; this research deals with the outdoor circulation elements in particular. The research aims to draw design concepts rooted in outdoor circulation elements in heritage urbanism, and their role as a governing element to forming and formulating both the architecture and urbanism, and as an active partner in the environmental system. The town of Al-Ula in the Kingdom of Saudi Arabia has been chosen as a case study, where the majority of its urban elements have been preserved. Al-Ula represents the ancient heritage, it is characterized by its clear interaction with the surrounding context and the existence of a unique and unconventional circulation element only dedicated to women. The research also reviews other unconventional circulation elements in several heritage urban bodies in some similar areas also affected by surrounding context. The research is divided into five parts: the first part addresses the unique form of Al-Ula town, and how it was affected and interacted with the natural, environmental, and social context of the area, and how this form influenced the forming of the circulation elements within the town. The second part studies circulation elements in Al-Ula town, draws the factors that governed these elements through the urban and architectural content, and how it was affected by other functional, environmental, and cultural contents, human and social relationships in the town body. The third part discusses some unconventional outdoor circulation elements in similar examples in different towns and areas. The fourth part contains the most important comparisons and observations about the ancient and modern circulation elements. The research sums up a group of important points and concepts that had a reflection on formulating the outdoor circulation elements through their spontaneous interaction with environment and community.
Heritage - circulation elements - Social aspects - Environmental aspects
Al-Ula
2016
09
01
603
621
https://jesaun.journals.ekb.eg/article_117619_5b20faaebae2edeb5ce83a0f6e74c3f5.pdf
JES. Journal of Engineering Sciences
1687-0530
1687-0530
2016
44
No 5
CONSOLIDATING AND STUDYING THE FEATURES OF THE ARCHITECTURAL STYLES AND ITS ELEMENTS OF THE FACADES BUILDINGS IN THE OLD NEIGHBORHOODS OF MUKALLA CITY - ANALYTICAL STUDY
Yasser
Khaled
Mansour
Mohammed
Ahmed
Bazhair
Hadramout architecture is marked by various features and by the diversity of unique architectural vocabulary. Although Mukalla city is considered one of the emerging cities compared to other cities of Hadramout, the city has become the most active and urbanism. The four ancient neighborhoods formed the center of the city and appeared in a various local -style architecture, interfaces, decorations and vocabulary diversity variety of architectural elements, which may vary from district to another. The influence of the Indian, Asia and Turkish style pattern is also appears on its public and private buildings. It is most common in vocabulary. The vocabulary and obvious building elements in the facades defined the existence of strong architectural experience in providing the ventilation and privacy solutions, requirements of its society that made up a mental and an aesthetic fantastic image of the beautiful city and its buildings. The old neighborhoods and its buildings exposed to a wave of transformations and changes the patterns of the modern building materials, which could threaten and distort this architectural heritage.
2016
09
01
622
640
https://jesaun.journals.ekb.eg/article_117620_febbbb0f4017a92a5cedbf458cc1e88b.pdf
JES. Journal of Engineering Sciences
1687-0530
1687-0530
2016
44
No 5
RANDOM RURAL URBAN SPRAWL ON AGRICULTURAL LAND IN EGYPT (PROBLEM DIMENSIONS & SOLUTION APPROACHES)
Hossam
Kotb El ghourab
This paper tries to analyse phenomenon\case of "Random Rural Urban Sprawl on Agricultural Land in Egypt" and decline of huge areas of most fertile land in Delta and old Valley.The paper depends on several serial steps which are together forming an ascending research line.This line starts with first step which focuses on defining theorticl concepts, fundamentals related to this case. Second step tries to go through historical roots and reasons of this case and to understand its interrelationships with many governmental policies and political, economic, social and cultural transformations happened in Egyptian socitiy through the past period (from 1952 until 2016). Third step tries to study phenomenon\case dinmensions (according to available data) and identify its current and expected situation and size, and also its current and future negative impacts and threats on the Egyptian socity. Forth step focuses on showing the past and current governmental efforts and evaluating its efficiency in dealing with the case. Fifth step presents two international cases as best practices to learn from them suitable lessons to deal with the case. This paper aims to set a general framework that draws a road map for the State "Egypt" to deal with the case of "Random Rural Urban Sprawl on Agricultural Land" in a comprehensive, integrated, and effective way, and to enable the state to achieve more control on random rural urban sprawl. This road map can both help in conserving fertile lands and achieve a good range of total feasibility in dealing with the case.
rural
Rural Urban - Rural Urban Sprawl
Random Rural Urban Sprawlon Agricultural Land
Decline of Fertile Agricultural Land
2016
09
01
641
658