International Journal of Engineering Research in Africa最新文献_第4页

Numerical Simulation of Geotechnical Isolation of Building Subjected to Earthquake Using Rubber Sand Mixtures 橡胶砂混合料对地震作用下建筑物岩土隔震的数值模拟

International Journal of Engineering Research in Africa Pub Date : 2023-09-12 DOI: 10.4028/p-amzl3q

Ali Brara, Djamalddine Boumezerane

{"title":"Numerical Simulation of Geotechnical Isolation of Building Subjected to Earthquake Using Rubber Sand Mixtures","authors":"Ali Brara, Djamalddine Boumezerane","doi":"10.4028/p-amzl3q","DOIUrl":"https://doi.org/10.4028/p-amzl3q","url":null,"abstract":"The use of recycled rubber in various civil engineering applications has seen a considerable rise in recent years. The rubber-soil mixture can exhibit a higher energy absorption capacity than soil alone, which would reduce the energy applied to structures, the stresses, and shocks they undergo. Base isolation is the process of isolating the base of a structure to limit the effects of earthquakes, so that the seismic forces applied to the base of the bedrock cannot move with the same intensity towards the super structure.In this work, the beneficial effects of rubber mixtures (RSM) in mitigating earthquakes when these mixtures are inserted as layers in the soil profile are highlighted; the approach is based on a method of using worn tires for seismic protection applications for infrastructures subjected to seismic loads. It involves mixing particles from used tires with soil materials and placing the mixtures under the foundation of the building as geotechnical insulation systems for vibration absorption.The foundation of a four-storey building is implanted in a soil profile in which a layer of rubber-sand mixture (RSM) has been inserted; to perform the role of seismic isolation when subjected to seismic excitation.The investigation is focused on the variation in the thickness of the layer on the one hand (between 1m and 4m), and on the other hand on the position of this layer in the soil mass (top, middle and bottom of the profile).The peaks of horizontal accelerations recorded at the base and top of the structure show that the sand-rubber mixture has adequate and promising potential for their application as seismic isolation materials for low-rise buildings. Moreover, the thickness of the layer and its location are two very determining parameters in the improvement of the performances of these RSM mixtures, especially in terms of reduction of the acceleration peak recorded.","PeriodicalId":45925,"journal":{"name":"International Journal of Engineering Research in Africa","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135886957","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

Experimental Investigation to Optimize Build Orientation and Raster Angle for PLA and ABS Specimens Generated by FDM Technology 优化FDM技术生成PLA和ABS试样的构建方向和光栅角度的实验研究

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International Journal of Engineering Research in Africa Pub Date : 2023-08-08 DOI: 10.4028/p-5vBIxb

A. El Azzouzi, H. Zaghar, L. Lasri, N. Moujibi

{"title":"Experimental Investigation to Optimize Build Orientation and Raster Angle for PLA and ABS Specimens Generated by FDM Technology","authors":"A. El Azzouzi, H. Zaghar, L. Lasri, N. Moujibi","doi":"10.4028/p-5vBIxb","DOIUrl":"https://doi.org/10.4028/p-5vBIxb","url":null,"abstract":"The fused deposition modeling (FDM) process is used increasingly in the manufacture of mechanical parts and more particularly in the automotive and aeronautical fields. The purpose of this work is to optimize build orientation for obtaining polylactic acid (PLA) and acrylonitrile butadiene styrene (ABS) samples with the best mechanical properties, dimensional accuracy, surface quality, and minimal total cost. For achieving This, PLA and ABS specimens are fabricated by FDM technology with three build orientations (flat, on edge, upright) and three raster angles (0°, 45°, 90°).at first, the dimensions of the produced samples are measured .secondly, the tensile test, DETLAB equipment was used to obtain tensile stress. In addition, roughness testers were also used to measure surface quality. As a consequence, the findings indicate that the mechanical strength increases with decreasing raster angle and by aligning from upright to flat orientation for both materials due to the fracture mechanism and loading direction. Also, the manufacturing orientation and raster angles significantly affected the dimensional accuracy and total cost. Additionally, there was a big difference in the surface roughness depending on the manufacturing orientation and raster angle; perpendicular measurements increase surface roughness values. We aim to investigate the impact of flat, on-edge, and upright build orientations as well as raster angles on the total cost, tensile strength, dimensional accuracy, and surface roughness of PLA and ABS material through tensile experiments.","PeriodicalId":45925,"journal":{"name":"International Journal of Engineering Research in Africa","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44326489","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

Application of the AM2 Model to Simulate Anaerobic Digestion of Municipal Solid Waste AM2模型在城市生活垃圾厌氧消化模拟中的应用

IF 0.7

International Journal of Engineering Research in Africa Pub Date : 2023-08-08 DOI: 10.4028/p-G7Pjt2

Amine Hajji, Y. Louartassi, M. Garoum, N. Laaroussi, M. Rhachi

引用次数: 0

Performance Evaluation of Hydroponics Control Systems for pH, Temperature, and Water Level Control 酸碱度、温度和水位控制水培控制系统的性能评价

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International Journal of Engineering Research in Africa Pub Date : 2023-08-08 DOI: 10.4028/p-RBT3yU

M. Rathedi, O. Matsebe, N. Ditshego

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Valorization of Moroccan Hemp Waste: Study of the Possibility of its Use in Thermal and Acoustical Insulation of Buildings 摩洛哥大麻废料的价值化：用于建筑物隔热和隔音的可能性研究

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International Journal of Engineering Research in Africa Pub Date : 2023-08-08 DOI: 10.4028/p-Wa98e1

Oussama Zine, D. Taoukil, Mohamed Ouakarrouch, I. El abbassi, E. Kadri, Mohammed lhassane Lahlaouti, A. El bouardi

{"title":"Valorization of Moroccan Hemp Waste: Study of the Possibility of its Use in Thermal and Acoustical Insulation of Buildings","authors":"Oussama Zine, D. Taoukil, Mohamed Ouakarrouch, I. El abbassi, E. Kadri, Mohammed lhassane Lahlaouti, A. El bouardi","doi":"10.4028/p-Wa98e1","DOIUrl":"https://doi.org/10.4028/p-Wa98e1","url":null,"abstract":"This paper aims to study the possibility of valorizing hemp residues in order to develop new local bio-composites from Moroccan hemp shiv and epoxy. The goal is to use them as thermal and acoustical insulation panels since these hemp residues exist in large quantities in landfills and present a national concern due to a lack of waste management technologies. For this purpose, several samples were prepared for different densities and two sizes of hemp shiv; crushed shiv (CS) and fibred shiv (FS). The results revealed that the increase of density resulted in an increase in thermal conductivity and a decrease in thermal diffusivity. However, the thermal conductivity of composites is still lower than 0.1 W/mK for the most studied samples. The samples show values of acoustic absorption coefficients varying between 0.2 and 0.59 for crushed shiv composites (CSC) at the frequency range (578-1396 Hz) and between 0.2 and 0.73 at the frequency range (662-1396 Hz) for Fibred shiv composites (FSC). It has been observed that the density has a significant effect on the sound absorption coefficient. Increasing the density shifts the acoustic absorption curve towards the low frequencies. Also, decreasing the particle size enhances the sound absorption in the medium frequency range (300-600 Hz). The obtained results are satisfactory for manufacturing these new composites that can be used as thermal and acoustic insulators. Moreover, it offered the best solution for hemp waste management.","PeriodicalId":45925,"journal":{"name":"International Journal of Engineering Research in Africa","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46301268","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

Laboratory Geotechnical Investigations on Five Silty Soils Sampled along the Banks of the Lubumbashi River/Haut-Katanga/DR Congo 对卢本巴希河沿岸/上加丹加/刚果民主共和国五种粉质土壤取样的实验室岩土工程调查

IF 0.7

International Journal of Engineering Research in Africa Pub Date : 2023-08-08 DOI: 10.4028/p-3hLFCa

Yannick Kiyukeno, Gustave Mukoko, B. François

{"title":"Laboratory Geotechnical Investigations on Five Silty Soils Sampled along the Banks of the Lubumbashi River/Haut-Katanga/DR Congo","authors":"Yannick Kiyukeno, Gustave Mukoko, B. François","doi":"10.4028/p-3hLFCa","DOIUrl":"https://doi.org/10.4028/p-3hLFCa","url":null,"abstract":"An adequate design of port structures along waterways requires a good knowledge of the geotechnical properties of the surrounding soils. This study aims to characterize the geotechnical laboratory properties of alluvial soils along the Lubumbashi river (section between the Tshombe and Tshondo bridges, approximately 3 km long) in the city of Lubumbashi, province of Haut Katanga in DR Congo. To meet this objective, five sampling zones were selected from which samples were taken with a hand auger and various geotechnical laboratory tests were performed. Identification tests reveal that the tested soils have low to moderate plasticity and are in the range of sandy silt to silty sand with a low fraction of clay particles, essentially inactive. Oedometric compression tests reveal that the soils in place are (moderately) compressible. The consolidated undrained (CU) triaxial compression and direct shear tests indicate effective values of internal friction angle and negligible drained cohesion that, are consistent for this kind of soil. In the end, the compressibility and strength parameters of the five tested soils are correlated with their plasticity index, showing a decrease in the shear strength and an increase in the compressibility when the plasticity index increase.","PeriodicalId":45925,"journal":{"name":"International Journal of Engineering Research in Africa","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43112403","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

Overall Equipment Efficiency Improvement through a Lean Approach in SME: A Case Study 中小企业通过精益方法提高整体设备效率的案例研究

IF 0.7

International Journal of Engineering Research in Africa Pub Date : 2023-08-08 DOI: 10.4028/p-1zhmXC

Amr Dahab, Mohammad Abdulwahed Younes, S. Backar

引用次数: 0

International Journal of Engineering Research in Africa Vol. 65 非洲工程研究国际期刊》第 65 卷

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International Journal of Engineering Research in Africa Pub Date : 2023-08-08 DOI: 10.4028/b-xes6du

A. O. Ibhadode

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Float Photovoltaic Module Prototype: Design, Simulation, and Electrical Performance Analysis 浮动光伏组件原型:设计、仿真和电气性能分析

IF 0.7

International Journal of Engineering Research in Africa Pub Date : 2023-08-08 DOI: 10.4028/p-kzV2Eo

Toufik Zarede, H. Lidjici

{"title":"Float Photovoltaic Module Prototype: Design, Simulation, and Electrical Performance Analysis","authors":"Toufik Zarede, H. Lidjici","doi":"10.4028/p-kzV2Eo","DOIUrl":"https://doi.org/10.4028/p-kzV2Eo","url":null,"abstract":"Photovoltaic solar energy is an abundant, renewable, and clean source of energy that can contribute to the energy transition. However, traditional land-based solar installation have limitations in terms of space, efficiency, and environmental impact. Floating solar panels have emerged as a promising technology that can overcome these limitations and provide a range of benefits. This work describes the design and experimental testing of a small-scale of floating photovoltaic module prototype, with a focus on the effect of solar irradiation on its maximum power output. The prototype is composed of a 4Wp photovoltaic module and a buoyant supporting structure. Using Matlab®, simulations were performed on the floating photovoltaic module under varying environmental conditions, including solar irradiance, temperature, and wind speed. The prototype demonstrated an electrical performance of 3.62W under solar irradiation of 895W/m2 and a temperature of 41°C, with a power ratio exceeding 97% of this maximum power under standard conditions. The prototype also showed a positive energy gain when compared to the same photovoltaic module in a horizontal or inclined position, particularly at high temperature and solar irradiance. Moreover, shows a stability and resistance in harsh weather conditions. The mathematical fitting with a Gaussian distribution shows the rapid increase of the maximum power of the floating photovoltaic module in the range of 37°C to 42°C of temperature with increasing solar irradiance.","PeriodicalId":45925,"journal":{"name":"International Journal of Engineering Research in Africa","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46578951","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

Optimum Shear Walls Distribution in Framed Structures for Buildings Subjected to Earthquake Excitations 地震作用下框架结构中剪力墙的优化分布

IF 0.7

International Journal of Engineering Research in Africa Pub Date : 2023-08-08 DOI: 10.4028/p-Ypjdg8

Nesreddine Djafar-Henni, R. Chebili

{"title":"Optimum Shear Walls Distribution in Framed Structures for Buildings Subjected to Earthquake Excitations","authors":"Nesreddine Djafar-Henni, R. Chebili","doi":"10.4028/p-Ypjdg8","DOIUrl":"https://doi.org/10.4028/p-Ypjdg8","url":null,"abstract":"Reinforced concrete shear walls, which are vertically oriented plate-like elements, are efficient members in controlling the response behavior of buildings against seismic actions. In this research work, the performance of reinforced concrete buildings with shear walls having different shear wall-to-frame stiffness ratios is investigated. The considered buildings were designed in compliance with the requirements of the Algerian seismic code RPA99v2003 and were supposed to be located in regions of high seismicity. Seven 3D finite element models with different shear wall-to-frame stiffness ratios were developed and assessed using the nonlinear static analysis. Engineering Demand Parameters (EDPs) such as lateral displacement, inter-story drift ratio, shear force, and bending moment along the building height were presented. The results clarified that the induced responses can be classified into two major groups: force-based and displacement-based EDPs. Moreover, as the shear wall-to-frame ratio increases, the observed force-based EDPs increase whereas the displacement-based EDPs decrease. From a force point of view, distributing shear walls so that the packet of stiffness is lumped at the center of the building, model G with a stiffness ratio of 6.0906, amplifies the induced forces. This distribution requires more reinforcements and can lead to a conservative design. From a displacement point of view, distributing shear walls so that the packet of stiffness is lumped at the periphery of the building, model C with a stiffness ratio of 1.7879, minimizes the induced shear force and bending moment and produces the lowest values. This represents the optimum case with maximum performance and minimum strength.","PeriodicalId":45925,"journal":{"name":"International Journal of Engineering Research in Africa","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45325635","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