Engineering Research Journal最新文献_第4页

Behavior of Steel Fiber Concrete Beams with Different Reinforcement Method Around Opening 不同配筋方式的钢纤维混凝土梁开孔周边性能研究

Engineering Research Journal Pub Date : 2023-09-01 DOI: 10.21608/erj.2023.315719

Mona M. Fawzy, Magdy Yousef, Samir M. Ahmed

{"title":"Behavior of Steel Fiber Concrete Beams with Different Reinforcement Method Around Opening","authors":"Mona M. Fawzy, Magdy Yousef, Samir M. Ahmed","doi":"10.21608/erj.2023.315719","DOIUrl":"https://doi.org/10.21608/erj.2023.315719","url":null,"abstract":"Openings in concrete beams is preferred than using extended dropped ceilings to accommodate utility ducts and pipes. This leads to significant cost saving but unfortunately, beam strength and serviceability are affected. Experimental study of behavior of steel fiber concrete beams with different reinforcement methods around opening by using external glass fiber reinforced polymer (GFRP) or internal additional steel bars in addition to opening size is conducted. Load deflection curves and load strain curves are discussed. Beam dimensions studied are scaled to half their actual dimensions where the studied dimensions are common in beams. The authors only choose one size for all models to make it easy to compare the results. Other dimensions should be studied in the future. The only two specimens with openings that maintain ductile behavior are when adding steel fibers to concrete not containing GFRP and adding GFRP around the opening in concrete without steel fibers. When comparing a specimen with same opening dimension to another containing steel fibers without GFRP, the usage of steel fibers increases ultimate load (P u ) by 24% and deflection (∆ u ) by 69% with elastic plastic behavior and initial stiffness (I.S) increases by 17%, post cracking stiffness (P.I) decrease by 24% and energy absorption (E.A) increase by two times. On the other hand, GFRP is used in beam specimen that doesn’t contain steel fibers in the concrete mixture, P u increases by 42% and ∆u increases by 88%.","PeriodicalId":161226,"journal":{"name":"Engineering Research Journal","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135248247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

دور التعليم الهجين في رفع كفاءة التعليم بأقسام الهندسة المعمارية 混合教育在提高建筑学教育效率方面的作用

Engineering Research Journal Pub Date : 2023-09-01 DOI: 10.21608/erj.2023.316012

احمد نبيل حسن الشبيني, محمد علاء مندور, محمد أحمد رياض

引用次数: 0

Effect of Mineral Admixtures and Recycled Concrete on Concrete Compressive Strength 矿物掺合料与再生混凝土对混凝土抗压强度的影响

Engineering Research Journal Pub Date : 2023-09-01 DOI: 10.21608/erj.2023.315723

Mona M. Fawzy, Samir M. Ahmed, Magdy Yousef

{"title":"Effect of Mineral Admixtures and Recycled Concrete on Concrete Compressive Strength","authors":"Mona M. Fawzy, Samir M. Ahmed, Magdy Yousef","doi":"10.21608/erj.2023.315723","DOIUrl":"https://doi.org/10.21608/erj.2023.315723","url":null,"abstract":"Reducing the quantity of cement used in concrete has been a goal for several years. Mineral admixtures such as silica fume, fly ash and metakaolin are used to replace cement in this research. This research aims to improve concrete compressive strength while becoming greener at the same time. Another aspect is to replace fine and coarse aggregates in concrete with others made of recycled concrete. Experimental tests are conducted by comparing the results of control concrete samples with those where 10% and 15% silica fume and fly ash are used. Metakaolin is utilized by 10%, 15% and 20% by weight of cement. Recycled fine aggregate percentages are 25%,50% and 100% by weight of new fine aggregate. Meanwhile, recycled coarse aggregate percentages are 50% and 100%. From this applied study it is found that the 90-and 28-days optimum percentage of silica fume, fly ash and metakaolin compared to other percentages is 10% which leads to an increase in compressive strength by up to 23%. As for the optimum percentage of recycled concrete coarse and fine aggregates, it is found to be 50% and it corresponds to 33% increase in compressive strength at 90 and 28 days.","PeriodicalId":161226,"journal":{"name":"Engineering Research Journal","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135248232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigating the Impact of Magnetic Fields and Pulsating Pressure on Non-Newtonian Fluid Flow in Symmetric/Asymmetric Corrugated Microchannels 研究磁场和脉动压力对对称/非对称波纹微通道中非牛顿流体流动的影响

Engineering Research Journal Pub Date : 2023-09-01 DOI: 10.21608/erj.2023.315737

Ahmed Y. Sayed, Shaaban I. Ahmed, Khaled. S. Mekheimer, Mohamed S. Abdel-wahed

{"title":"Investigating the Impact of Magnetic Fields and Pulsating Pressure on Non-Newtonian Fluid Flow in Symmetric/Asymmetric Corrugated Microchannels","authors":"Ahmed Y. Sayed, Shaaban I. Ahmed, Khaled. S. Mekheimer, Mohamed S. Abdel-wahed","doi":"10.21608/erj.2023.315737","DOIUrl":"https://doi.org/10.21608/erj.2023.315737","url":null,"abstract":"This study presents approximate analytical solutions for the velocity and volume flow rate of an electrically conducting, incompressible, and viscous Jeffrey fluid flowing through an asymmetric corrugated channel between two slit microparallel plates under electromagnetohydrodynamic conditions. The study uses the perturbation method to describe the periodic sinusoidal waves with small amplitude that characterize the corrugations of the two walls, which can be either in phase or half-period out of phase. The study also examines how the corrugations affect the velocity of the EMHD flow by performing numerical computations. The results show the dependence of the velocity profiles and mean velocity parameter on various factors, including Reynolds number (𝑅𝑒) , Hartmann number (𝐻𝑎) , Porous Medium (𝐷𝑎) , dimensionless wave number (𝜆) of the wall perturbation, and the dimensionless relaxation time (𝜆 1 ) and retardation time (𝜆 2 ) . The findings of this study have important implications for understanding the behavior of non-Newtonian fluids within asymmetric corrugated channels under electromagnetohydrodynamic conditions.","PeriodicalId":161226,"journal":{"name":"Engineering Research Journal","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135248347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

دور أدوات نمذجة طاقة المباني (BEM) في رفع كفاءة الغلاف الخارجي دراسة حالة مبنى تعليمي قائم 建筑能源建模工具在提高现有教育建筑的个案研究提高外壳的效率方面的作用

Engineering Research Journal Pub Date : 2023-09-01 DOI: 10.21608/erj.2023.315909

أيمن سمير محمود, نسرين فتحي عبد السلام, ابتهال جلال الدين محمد

引用次数: 0

Appling ETFE Material as Pneumatic Modular Cushions in Workspace's Fascade For Saving Energy 应用ETFE材料作为气动模块垫在工作空间幕墙节能

Engineering Research Journal Pub Date : 2023-09-01 DOI: 10.21608/erj.2023.316208

Mohamed  A. Elnawawy, Mohamed A. Mandour, Mamdouh Farag, Marwa Kamal

{"title":"Appling ETFE Material as Pneumatic Modular Cushions in Workspace's Fascade For Saving Energy","authors":"Mohamed  A. Elnawawy, Mohamed A. Mandour, Mamdouh Farag, Marwa Kamal","doi":"10.21608/erj.2023.316208","DOIUrl":"https://doi.org/10.21608/erj.2023.316208","url":null,"abstract":"According to all current studies, global warming and climate change are causing disasters for humanity. As a technique to improve natural light effectiveness in deep office spaces, integrating daylighting systems within building skin has become a lot of attention. However, maintaining the stability and uniformity of daylight distribution throughout the day inside a building remains difficult. Consideration of energy efficiency in buildings and sustainability factors will result in large energy savings, environmental savings, and reduction of greenhouse gas emissions. ETFE foil has been increasingly employed as a building material for building envelopes over the past decades to generate green buildings. The research focuses on a new shading method for ETFE-membrane pneumatic modular cushions. The risk of overheating and glare effect in the summer is particularly considerable due to the high visual transmission of an ETFE foil (one layer transparent ETFE foil 92% @ 200m). As a result, a novel angle-selective shading system filters direct sunlight while allowing diffuse sunlight to enter the building. This solution, in particular, implies a reduction in cooling energy demands, which should improve thermal, daylighting and saving energy in the workspace. the researcher applies ETFE pneumatic modular cushions on the (DAR AL-Handasah) office building at smart-village as a case study to measure the effect of the cushions after and before in saving energy. A parametric design approach will facilitate a multistep comparison study to identify the proper design for the system.","PeriodicalId":161226,"journal":{"name":"Engineering Research Journal","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135249000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving Quality of Student’s Life on University Campus (Guidelines of New Assessment Tools) 提高大学生校园生活质量(新评估工具指引)

Engineering Research Journal Pub Date : 2023-06-01 DOI: 10.21608/erj.2023.303065

Sara Tawfik Mohamed, A. Mandour, Hussam Baker

{"title":"Improving Quality of Student’s Life on University Campus (Guidelines of New Assessment Tools)","authors":"Sara Tawfik Mohamed, A. Mandour, Hussam Baker","doi":"10.21608/erj.2023.303065","DOIUrl":"https://doi.org/10.21608/erj.2023.303065","url":null,"abstract":": University is considered one of the main pillars on which the advancement and growth of society is based, it has a vital role in building student’s character, goals, and future, and it affects all aspects of his life, such as social, educational, and cultural. One of the key elements that influences students’ life on campus is the design of outdoor spaces (student spaces) where they spend most of their day. Several previous studies evaluated the quality of a university campus and the quality of student university life from different sides, most of which were academic, except the UI-Green Metric system that assesses the environmental quality of a campus. The current study aims to provide a new comprehensive assessment tool that evaluates the quality of student’s life in all fields of life. The study reviewed many publications about quality of life and campus design requirements and based this tool on Maslow’s expanded hierarchy of needs as well as Lang’s functionalism theory. In order to develop a balanced index, the study adopted The analytical hierarchy process (AHP) and conducted 50 expert questionnaires to produce a balanced numerical evaluation index. An index was reached consisting of 25 quality indicators categorized into seven dimensions; physiological, social, safety & security, functional, cognitive, self-esteem & self-actualization, and aesthetic quality.","PeriodicalId":161226,"journal":{"name":"Engineering Research Journal","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124464874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

نموذج مقترح لتصنيف المناطق الاقتصادية الخاصة وفقاً لمؤشرات الحوكمة والتنافسية 根据治理和竞争指标对特别经济区进行分类的拟议模式

Engineering Research Journal Pub Date : 2023-06-01 DOI: 10.21608/erj.2023.302285

مهجة صلاح عبد الله, نهى أحمد نبيل, محمد أحمد رياض

引用次数: 0

Identifying Retrofit Technology to Improve Building Energy Performance: A Review 确定改造技术以提高建筑能源性能:综述

Engineering Research Journal Pub Date : 2023-06-01 DOI: 10.21608/erj.2023.302133

Toka Tawfik, Laila M. Khodeir, Fatma Fathy

{"title":"Identifying Retrofit Technology to Improve Building Energy Performance: A Review","authors":"Toka Tawfik, Laila M. Khodeir, Fatma Fathy","doi":"10.21608/erj.2023.302133","DOIUrl":"https://doi.org/10.21608/erj.2023.302133","url":null,"abstract":"Retrofitting an existing building is one of the environmentally friendly solutions to reduce the dependency on constructing new buildings. There are huge numbers of existing building stocks that are suitable to be retrofitted such as historical buildings, offices, residential, warehouse, factories, vacant buildings and other historical buildings. However the retrofit process is still confronted by technical and social challenges. So we need to know how to make the best use of the public buildings in Egypt in sustainable way. In light of the anticipated relocation of the ministerial authorities to the New Capital city, more than 40 public administrative buildings in Cairo will be vacated and subjected to adaptive re-use plans. However, the available literature does not effectively help in terms of selecting the best retrofit techniques because energy efficient retrofitting is neither required nor widely practiced in Egypt. This paper presents a systematic approach to selecting and identifying the best retrofit alternatives for existing buildings. The generic building retrofitting problem and key issues involved in building retrofit investment decisions are outlined. There is also an overview of the research and development, as well as technologies of retrofit in existing buildings. This paper provides building practitioners and researchers a better understanding of how to undertake an efficient building retrofit to enhance energy conservation and sustainability. Furthermore, it highlights the significance of Building Information Modeling as a part of the retrofitting process.","PeriodicalId":161226,"journal":{"name":"Engineering Research Journal","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117079748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An approach to improve land use and urban mobility patterns in Egyptian communities (Case study of El-Sheikh Zayed city) 改善埃及社区土地利用和城市流动模式的方法(以谢赫扎耶德市为例)

Engineering Research Journal Pub Date : 2023-06-01 DOI: 10.21608/erj.2023.303074

Amanda Abdelmonem Elwany, Yasmin ElSemary

引用次数: 0