NED University Journal of Research最新文献

FINITE ELEMENT ANALYSIS OF REINFORCED AND UNREINFORCED DEEP SOIL MIXING COLUMNS INSTALLED IN COHESIVE AND NON-COHESIVE SOILS 安装在粘性土和非粘性土中的加固和非加固深层土壤搅拌柱的有限元分析

NED University Journal of Research Pub Date : 2024-01-24 DOI: 10.35453/nedjr-stmech-2023-0003

Esma Alan, Müge Balkaya

{"title":"FINITE ELEMENT ANALYSIS OF REINFORCED AND UNREINFORCED DEEP SOIL MIXING COLUMNS INSTALLED IN COHESIVE AND NON-COHESIVE SOILS","authors":"Esma Alan, Müge Balkaya","doi":"10.35453/nedjr-stmech-2023-0003","DOIUrl":"https://doi.org/10.35453/nedjr-stmech-2023-0003","url":null,"abstract":"A parametric study employing three-dimensional finite element analysis is used in this paper to examine the improvement of soft clay and silty loose sand under a road embankment using deep soil mixing (DSM) columns. Both soils are designed with three variables namely DSM column diameter (D), DSM column length (L) and centre-to-centre distance of the DSM columns (s). The settlement values under the road embankment constructed with and without DSM columns were obtained by numerical analysis. The analyses were also repeated for the DSM columns which were stiffened by adding I-profiles. The results showed that the improvement effect of the DSM columns on settlement is higher in soft clay. For constant improvement area ratio (ar), the maximum improvement is achieved for D = 80 cm (2.62 ft.) and increasing D did not affect the degree of improvement. In both soil types, settlement decreased with increasing L within the weak soil zone. Increasing L into the comparatively stronger soil did not significantly affect the settlement value. Although the settlement decreased with increasing ar in silty loose sand, it reached at maximum in soft clay at ar of thirty-five percent and was not affected thereafter with increasing ar values.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"60 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139602373","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

BEHAVIOUR AND DURABILITY OF GRAPHENE CONCRETE COMPOSITE AGAINST ACID AND SULPHATE ATTACKS 石墨烯混凝土复合材料抗酸和硫酸盐侵蚀的性能和耐久性

NED University Journal of Research Pub Date : 2023-01-15 DOI: 10.35453/nedjr-stmech-2022-0017

M. El-Hawary, Mohammad Mataqi, A. Ben-Nakhi

{"title":"BEHAVIOUR AND DURABILITY OF GRAPHENE CONCRETE COMPOSITE AGAINST ACID AND SULPHATE ATTACKS","authors":"M. El-Hawary, Mohammad Mataqi, A. Ben-Nakhi","doi":"10.35453/nedjr-stmech-2022-0017","DOIUrl":"https://doi.org/10.35453/nedjr-stmech-2022-0017","url":null,"abstract":"Graphene is a Nano-material whose tensile strength is about two-hundred times higher as compared to steel. The effects of graphene-concrete composite on the properties of concrete have been investigated in this paper. A mix with a water-to-cement ratio of 0.4 was designed. The graphene powder was introduced as 0.5 percent, one percent, one-and-a-half percent and two percent (designated as GC2). The control mix was prepared without mixing the graphene powder. The same size and type of aggregates were used for all these concrete mixes. For each mix, resistance to acid (H2SO4) and sulphate (Na2SO4) attacks, compressive strength, water absorption, compressive strength development over time, compressive stress-strain relationship, split tensile strength, and modulus of rupture were determined. It was found that the addition of graphene increased the acid and sulphate resistance, and absorption. The acid resistance of concrete improved for all the employed mixes. The highest improvement was achieved for the GC2 mix. On the other hand, an overall decrease in water absorption of the mixes was noticed. Moreover, the addition of graphene increased the bulk and apparent density of the mix and decreased the volume of permeable voids.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129831973","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: 1

A NEW PERSPECTIVE FOR STABILITY ANALYSIS OF STRUCTURES 结构稳定性分析的新视角

NED University Journal of Research Pub Date : 2023-01-01 DOI: 10.35453/nedjr-stmech-2021-0010.r3

A. Ranjbaran, M. Ranjbaran, Fatema Ranjbaran, Alimohammad Rousta, Shamsodin Hashemi

引用次数: 0

HARNESSING POTENTIALS OF SOLAR RADIATION IN LIBERIA USING ARTIFICIAL NEURAL NETWORK 利用人工神经网络在利比里亚利用太阳辐射的潜力

NED University Journal of Research Pub Date : 2022-09-05 DOI: 10.35453/nedjr-ascn-2022-0011r1

O. Abiodun, Mahmoud Solomon, James Bolarinwa Olaleye, Joseph Olalekan Olusina

{"title":"HARNESSING POTENTIALS OF SOLAR RADIATION IN LIBERIA USING ARTIFICIAL NEURAL NETWORK","authors":"O. Abiodun, Mahmoud Solomon, James Bolarinwa Olaleye, Joseph Olalekan Olusina","doi":"10.35453/nedjr-ascn-2022-0011r1","DOIUrl":"https://doi.org/10.35453/nedjr-ascn-2022-0011r1","url":null,"abstract":"The current state of energy supply in Liberia is a combination of fossil fuel and hydroelectric power generation and the cost of generating, maintaining, and distributing energy is high. On the other hand, Liberia lies within a suitable zone for solar energy utilisation for photovoltaic applications, as its climate is relatively hot all year round. This paper investigates the use of the artificial neural network to model the reliability of solar radiation in a study area in Liberia, as a necessary prerequisite for alternative power generation. Seven variables (longitude, latitude, elevation, average temperature, precipitation, wind speed and relative humidity) were used as input data (causal variables) and one parameter/factor (solar radiation) was used as output (response variable) for\u00002000-2018. The obtained results showed that the employed model explains all the variabilities of the response data around the mean with an overall regression value of 0.93. It was found through visualised maps that the study area is in a suitable spot for the utilisation of solar energy potentials.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114683512","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

ANALYSING HOUSE PRICE PREDICTIONS ACCORDING TO LIVING STANDARDS BASED ON MACHINE LEARNING METHODS 基于机器学习方法，根据生活水平分析房价预测

NED University Journal of Research Pub Date : 2022-09-05 DOI: 10.35453/nedjr-ascn-2022-0001r3

K. Mahboob, Nida Khalil, Saniah Rehan

引用次数: 0

A DIRECT BASED METHOD WITH AN ANALYTICAL CAPABILITY PARAMETER TO DETECT OPEN CRACKS ON FREE VIBRATING BEAMS 一种带有分析能力参数的直接法检测自由振动梁的开缝

NED University Journal of Research Pub Date : 2022-06-01 DOI: 10.35453/nedjr-stmech-2022-0001

Marcos Ruben Carrizo, J. Raffo

{"title":"A DIRECT BASED METHOD WITH AN ANALYTICAL CAPABILITY PARAMETER TO DETECT OPEN CRACKS ON FREE VIBRATING BEAMS","authors":"Marcos Ruben Carrizo, J. Raffo","doi":"10.35453/nedjr-stmech-2022-0001","DOIUrl":"https://doi.org/10.35453/nedjr-stmech-2022-0001","url":null,"abstract":"This paper presents analysis of a mechanical system composed of free vibration of an Euler-Bernoulli beam with an open crack. Two new proposals have been presented to analyse such systems: a direct crack identification method to obtain the crack properties and a theoretical margin of detection parameter to quantify the capability of the theoretical model used to detect a single crack. The direct crack identification method uses first three natural frequencies of a cracked beam to obtain the unknown crack location and depth without solving the inverse vibration problem. On the other hand, the theoretical margin of detection parameter provides capability to the analytical model to detect the location and depth of an open crack using the first three natural frequencies as a function of crack location and depth for different end conditions. To show the robustness of the direct crack identification method, errors on the first three exact values of the natural frequency parameters of the cracked beam are induced before applying the proposed method and the resulting errors were calculated. Contour plots have been developed for classical and elastically restrained end conditions to predict the detectable zones as a function of crack location and depth. The proposed analysis has been carried out on the widely used closed-form solution of the beam model.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115001801","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

PERSIAN PROBABILITY FUNCTION: AN ALTERNATIVE TO CLASSICAL PROBABILITY FUNCTION 波斯概率函数:经典概率函数的替代

NED University Journal of Research Pub Date : 2022-03-22 DOI: 10.35453/nedjr-ascn-2021-0026r1

A. Ranjbaran, M. Ranjbaran, Fatema Ranjbaran, Shamsodin Hashemi, Alimohammad Rousta

引用次数: 1

REINFORCED CONCRETE FLAT SLABS WITH COMMON ARRANGEMENTS OF FIBRE REINFORCED POLYMER SHEETS 纤维增强聚合物薄板的常用结构的钢筋混凝土平板

NED University Journal of Research Pub Date : 2022-01-17 DOI: 10.35453/nedjr-stmech-2019-0001r3

G. Atefatdoost, B. JavidSharifi, Mohammad Ali Khani

引用次数: 0

ASSESSMENT OF SOLAR ENERGY POTENTIAL FOR A RADIALLY STAGGERED HELIOSTATS FIELD USING SUN TRACKING METHOD 利用太阳跟踪法评估径向交错定日镜场的太阳能潜力

NED University Journal of Research Pub Date : 2021-12-24 DOI: 10.35453/nedjr-ascn-2021-0002

M. E. Siddiqui

{"title":"ASSESSMENT OF SOLAR ENERGY POTENTIAL FOR A RADIALLY STAGGERED HELIOSTATS FIELD USING SUN TRACKING METHOD","authors":"M. E. Siddiqui","doi":"10.35453/nedjr-ascn-2021-0002","DOIUrl":"https://doi.org/10.35453/nedjr-ascn-2021-0002","url":null,"abstract":"This article deals with the potential assessment of tower type solar thermal power system. An algorithm was developed to employ sun-tracking method, which provides the characteristic angles of the heliostats such that the incoming beams of sun rays are reflected to the receiver. A suite of MATLAB code was developed to implement the mathematical models for a quick evaluation of solar energy potential in a radially staggered heliostat field for the capital city of Kingdom of Saudi Arabia, Riyadh. An existing clear-sky model in the literature was used to compute hourly insolation. Optical efficiencies and heat collected by the receiver (from individual heliostat in the field on hourly basis) were computed and the monthly-averaged daily results were presented zone-wise and for the complete heliostat field. It was observed that the optical efficiency of the heliostat decreases with increasing distance from the receiver tower; this was due to increasing spillage of the reflected rays and decreasing cosine efficiency with increasing distance of the heliostat from the receiver tower. Results showed that annual average optical efficiency of the field is nearly forty-nine percent.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129273427","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

EFFECTS OF STRUCTURE HEIGHT ON SEISMIC DEMAND OF MOMENT-RESISTING REINFORCED CONCRETE FRAMES CONSIDERING SOIL-STRUCTURE INTERACTION 考虑土-结构相互作用的结构高度对钢筋混凝土框架抗震需求的影响

NED University Journal of Research Pub Date : 2021-01-01 DOI: 10.35453/nedjr-stmech-2020-0006

B. JavidSharifi, Sedigheh Gheisari

{"title":"EFFECTS OF STRUCTURE HEIGHT ON SEISMIC DEMAND OF MOMENT-RESISTING REINFORCED CONCRETE FRAMES CONSIDERING SOIL-STRUCTURE INTERACTION","authors":"B. JavidSharifi, Sedigheh Gheisari","doi":"10.35453/nedjr-stmech-2020-0006","DOIUrl":"https://doi.org/10.35453/nedjr-stmech-2020-0006","url":null,"abstract":"Forces and displacements induced in a building due to structural responses to earthquake excitation are called seismic demands which depend upon the input motion, structural characteristics, site effects and the interaction of structure with soil. Structural response of three laterally non-controlled moment-resisting reinforced concrete frame structures with three different soil conditions are have been investigated in this paper. The soil conditions include loose soil, medium soil and rigid ground. The soil-structure interaction of low-, mid- and high-rise frame structures with the above mentioned soil types was analysed by performing nonlinear response history analyses. A set of eleven earthquake motions was employed in the analyses and maximum structural seismic demands for the frame structures were calculated. It was found that pressure-independent relatively loose sandy soils are not very critical for low-rise structures. On the other hand, pressure-independent relatively loose sandy soils and pressure-independent medium sandy soils are highly critical for mid-rise and high-rise structures, respectively. Categorisation of the soils is performed based on the value ranges of a series of constitutive parameters. Further, fixity of the base is most effective in controlling storey displacements until approximately one-third of the structure height. Medium soil leads to highest maximum base shears in low-rise structures while fixed-base and medium cases, and fixed base state control the behaviours of mid-rise and high-rise structures, respectively.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114797182","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