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An Automated Algorithm for the Sectional Analysis of Reinforced and Prestressed Concrete Columns 钢筋和预应力混凝土柱截面分析的自动算法
IF 1.1 Pub Date : 2022-05-01 DOI: 10.2478/jaes-2022-0010
B. Kovács, Traian-Nicu Toader
Abstract This article aims to describe an automatic calculation algorithm developed for the analysis of reinforced concrete and / or prestressed concrete cross sections. The sectional analysis consists in the generation of two characteristic curves: the bending moment - curvature (M-1/r) and the axial force - bending moment (N-M), the calculation approach and the implementation of the algorithm being briefly described by the mathematical equations used. To verify the calculation algorithm, the results were compared with those obtained from experimental tests in the laboratory but also with numerical simulations using commercial computational software based on the finite element method (FEM). The algorithm was written in the MATLAB programming language. The results obtained with the developed algorithm show conservative results when compared to the experimental ones. Moreover, the bending moment resistance for prestressed concrete columns using bonded tendons is better estimated with at least 10% when compared with the one obtained with a fiber based cross section nonlinear analyses.
摘要本文旨在描述一种用于钢筋混凝土和/或预应力混凝土截面分析的自动计算算法。截面分析包括生成两条特征曲线:弯矩-曲率(M-1/r)和轴向力-弯矩(N-M),使用的数学方程简要描述了算法的计算方法和实现。为了验证计算算法,将结果与实验室实验测试的结果进行了比较,并与基于有限元法的商业计算软件进行的数值模拟进行了比较。该算法是用MATLAB编程语言编写的。与实验结果相比,用所开发的算法获得的结果显示出保守的结果。此外,与基于纤维的横截面非线性分析相比,使用粘结钢筋束的预应力混凝土柱的抗弯矩估计值至少为10%。
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引用次数: 0
Risk Level of Design and Procurement Factors Causing Construction Waste Generation 引致建筑废物产生的设计及采购因素的风险水平
IF 1.1 Pub Date : 2022-05-01 DOI: 10.2478/jaes-2022-0002
A. Bachayo, A. Memon, M. Hussain, I. Rahman, S. Ahmed
Abstract Construction waste is a global concern among the practitioners and has got attention of the researchers for many years. This issue is serious in construction industry of Pakistan also and various researchers have contributed in addressing it. This paper identified design and procurement related factors and assessed their risk level in causing construction waste. Data was collected through questionnaire survey amongst the practitioners from client consultants and contractors working on construction projects in Karachi and Hyderabad division of the Sind province. A total of 72 completed questionnaire forms were analysed and the results shows that 8 of the 20 factors are highly important factors and fall in the red zone of the risk matrix. It was also observed that last minute client requirements is reported as most important factor in design related issues while “items not in compliance with specification” is the most risk factor in the category of the procurement. Besides these, “last minute client requirements” and “Mistakes in quantity surveys” are the key factors which have significant effect on project cost. The findings of this study will be helpful for the practitioner to improve design and procurement quality for controlling the waste generation.
摘要建筑垃圾是一个全球性的问题,多年来一直受到研究者的关注。这一问题在巴基斯坦建筑业也很严重,各研究人员为解决这一问题做出了贡献。本文确定了设计和采购相关因素,并评估了它们造成建筑垃圾的风险水平。数据是通过对信德省卡拉奇和海得拉巴地区从事建筑项目的客户顾问和承包商的从业人员进行问卷调查收集的。共分析了72份完整的问卷,结果显示,20个因素中有8个是高度重要的因素,属于风险矩阵的红色区域。另据观察,最后一分钟的客户要求被报告为设计相关问题中最重要的因素,而“不符合规范的物品”是采购类别中最危险的因素。除此之外,“最后一分钟的客户要求”和“数量调查中的错误”是影响项目成本的关键因素。这项研究的结果将有助于从业者提高控制废物产生的设计和采购质量。
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引用次数: 2
Rice Husk Ash (RHA) Based Concrete: Workability and Compressive Strength with Different Dosages and Curing Ages 稻壳灰(RHA)基混凝土:不同掺量和龄期的和易性和抗压强度
IF 1.1 Pub Date : 2022-05-01 DOI: 10.2478/jaes-2022-0016
I. H. Wagan, A. H. Memon, N. Memon, F. T. Memon, M. H. Lashari
Abstract To reduce the consumption of cement in construction industry has been a hot area of consideration now days due to high evolution of CO2 gases during its production. Since decades efforts are made to replace cement with cementitious materials; minerals, agricultural, industrial by products etc. A few are fly ash, ground granulated blast furnace slag, silica fume, rice husk ash etc. These cementitious materials are often adopted as partial replacement of cement. However, their effectiveness and suitability as cementitious material depends upon their properties and the source of the production. Pakistan is an agricultural country and one of the major crops is Rice crop. It produces a substantial amount of rice husk during the processing g of the rice. A substantial amount of Rice Husk Ash (RHA) is produced on the burning of rice husk used as fuel in the rice mills while generating steam for parboiling process of rice grains. This ash causes the environmental problems also if not dumped properly. RHA is believed to have siliceous properties which may be used as supplementary cementitious material in concrete. As the suitability of supplementary cementitious materials is dependent upon the source of rice husk, temperature of burning of husk, its fineness and other properties. This study is focused on to determine the effect of rice husk ash produced by burning of the rice husk obtained from the local rice mills. Experimental investigation carried includes the determination of workability and compressive strength of concrete with different dosage of RHA from 5% to 30% with an increment of 5% tested at 1day, 3days, 7days and 28 days of the age of concrete. The results are compared with corresponding concrete without RHA and tested at the same ages. The results show the reduction in both the parameter; workability and compressive strength due to RHA particularly at its higher dosage beyond 10% by weight of cement.
摘要由于水泥生产过程中二氧化碳排放量高,降低水泥在建筑业中的消耗一直是人们关注的热点。几十年来,人们一直在努力用胶结材料取代水泥;矿物、农业、工业副产品等。少数是粉煤灰、磨细高炉矿渣、硅灰、稻壳灰等。这些胶结材料通常被用作水泥的部分替代材料。然而,它们作为胶结材料的有效性和适用性取决于它们的性质和生产来源。巴基斯坦是一个农业国家,主要作物之一是水稻。在加工大米的过程中,它会产生大量的稻壳。大量的稻壳灰(RHA)是在碾米机中用作燃料的稻壳燃烧过程中产生的,同时产生蒸汽用于米粒的蒸煮过程。如果倾倒不当,这些灰烬也会造成环境问题。RHA被认为具有硅质性质,可以用作混凝土中的辅助胶凝材料。由于补充胶凝材料的适用性取决于稻壳的来源、稻壳的燃烧温度、其细度和其他性能。本研究的重点是确定燃烧从当地碾米厂获得的稻壳产生的稻壳灰的影响。所进行的实验研究包括在混凝土龄期的第1天、第3天、第7天和第28天测试不同剂量的RHA(从5%到30%,增量为5%)的混凝土的和易性和抗压强度。将结果与相应的无RHA混凝土进行了比较,并在相同的龄期进行了试验。结果表明,这两个参数都有所降低;由于RHA,特别是在其超过水泥重量10%的更高剂量下。
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引用次数: 0
Prediction of Fresh and Hardened Properties of Self-Compacting Heavy-Weight Concrete Using Response Surface 用响应面预测自密实大强度混凝土的新鲜和硬化性能
IF 1.1 Pub Date : 2022-05-01 DOI: 10.2478/jaes-2022-0012
Sibel Sağlıyan, E. Yalçın, K. E. Alyamaç, C. Polat
Abstract The aim of this study is to investigate the fresh and hardened properties of the self-compacting heavy-weight concrete (SCHWC) and to develop a mathematical model for the prediction of these properties. The binder was the Portland cement and fly ash (FA). Barite aggregate was used to achieve the heavy-weight concrete (HWC). A polycarboxylate based super plasticizer was used to increase workability and reach self-compacting feature. To research the fresh and hardened properties SCHWC many concrete mixes were prepared accordingly with “water-cement ratios”, “total aggregate-cement ratios”, and “fly ash-cement ratios”. These samples were tested to get the slump-flow, V-funnel, 7 and 28-day compressive strength values. The Response Surface Methodology (RSM) was used to develop regression equations using these experimental results. It is observed that the estimated values obtained with RSM are compatible with those obtained by the experimental method for the fresh and hardened properties of SCHWC.
摘要本研究的目的是研究自密实重型混凝土(SCHWC)的新鲜和硬化性能,并开发一个预测这些性能的数学模型。粘合剂是波特兰水泥和粉煤灰(FA)。重晶石骨料被用于实现重型混凝土(HWC)。采用聚羧酸系超级增塑剂提高加工性能,达到自密实的目的。为了研究SCHWC的新鲜和硬化性能,根据“水灰比”、“总骨料水泥比”和“粉煤灰水泥比”制备了许多混凝土混合物。对这些样品进行测试,以获得坍落度流量、V型漏斗、7天和28天抗压强度值。使用响应面方法(RSM)利用这些实验结果建立回归方程。观察到,用RSM获得的估计值与用实验方法获得的SCHWC的新鲜和硬化性能的估计值是一致的。
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引用次数: 0
Comparative Studies and Research on Optimizing Electric Consumption of Water Supply Systems 供水系统优化用电的比较研究
IF 1.1 Pub Date : 2022-05-01 DOI: 10.2478/jaes-2022-0014
S. Szabo, T. Kovács, G. Ionescu, K. Cziszter, Daniela-Smaranda Ionescu, A.F. Sărăcuț-Ardelean
Abstract Water Supply Systems (WSS) can very well be dubbed as the backbone of every major human settlement for thousands of years at this point as every major human settlement throughout history has, regardless of time period or rural/urban erection or evolution has had its emplacement close to if not dead center over a significant water source that can provide this valuable and desperately needed resource to the populace. Of course, with the passage of time and the ever increasing number of the population and their life style, new techniques and technologies were incorporated within the grand design of the water supply pipeline, mainly automation and operation reliability boosts by means of electricity. It is a given that electrical current is not cheap to produce and maintain, although it is a field of ongoing study and research when it comes to optimizing the energy consumption of any system that runs on this costly resource, both for making the overall operation of the entire system more reliable but also more economical, all the while taking inspiration of multiple specialty works published within this field and, of course, already established local and European Union standards within Romania.
供水系统(WSS)可以被称为数千年来每个主要人类住区的支柱,因为历史上的每个主要人类住区,无论何时或农村/城市的建立或发展,都有一个靠近重要水源的位置,如果不是死中心的话,可以为民众提供这种宝贵的和迫切需要的资源。当然,随着时间的推移,人口和生活方式的不断增加,供水管道的宏伟设计中融入了新的技术和技术,主要是通过电力来提高自动化和运行可靠性。众所周知,电流的生产和维护并不便宜,尽管这是一个正在进行的研究和研究领域,当涉及到优化任何运行在这种昂贵资源上的系统的能耗时,为了使整个系统的整体运行更可靠,也更经济,同时从该领域发表的多个专业作品中获得灵感,当然,已经在罗马尼亚建立了地方和欧盟标准。
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引用次数: 0
A Simplified Numerical Approach to Predict Bearing Capacity of Soil for Shallow Foundation 预测浅基础地基承载力的简化数值方法
IF 1.1 Pub Date : 2022-05-01 DOI: 10.2478/jaes-2022-0005
J. Das, B. Bharali
Abstract For the safe and economical design of a foundation under any civil engineering structure, precise estimation of the ultimate bearing capacity (UCB) of soil beneath the foundation is of significant concern. Numerous researchers have contributed to these field and proposed theories and equations to predict the subsoil’s ultimate bearing capacity. But determining the approximate value of bearing capacity depends on soil type and its characteristics, groundwater table, types of loads, loaded area of footing, depth of footing, etc. Moreover, deciding the appropriate depth and size of footing is a crucial task. This paper aims to propose a simplified numerical approach to predict the bearing capacity of soil beneath the foundation (NABBSF) using MATLAB software. Considering shear failure and excessive settlement criteria, this model will predict the ultimate, safe, and allowable soil bearing capacity beneath an isolated footing at different depths. The validity and accuracy of the proposed model is verified by comparing it with real field data.
摘要对于任何土木工程结构下的地基的安全和经济设计,精确估计地基下土壤的极限承载力(UCB)是非常重要的。许多研究人员对这一领域做出了贡献,并提出了预测底土极限承载力的理论和方程。但是,确定承载力的近似值取决于土壤类型及其特性、地下水位、荷载类型、基脚受力面积、基脚深度等。此外,确定合适的基脚深度和尺寸是一项至关重要的任务。本文旨在提出一种利用MATLAB软件预测地基下土体承载力的简化数值方法。考虑到剪切破坏和过度沉降标准,该模型将预测不同深度的独立基脚下的极限、安全和容许土壤承载力。通过与实际数据的比较,验证了该模型的有效性和准确性。
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引用次数: 0
Investigating the Response of Single Pile Under Pure Torsion 单桩在纯扭转作用下的响应研究
IF 1.1 Pub Date : 2022-05-01 DOI: 10.2478/jaes-2022-0006
A. Hasan, Rafi M. Qasim
Abstract The single pile is a structural element that has an important role in supporting any part of the superstructure. This paper adopted three dimensional finite element modelling by using ANSYS to discover the influence of soil size domain on pile diameter, pile length, load eccentricity and torsion magnitude. One type of soil was used and described by Drucker-Prager model. The numerical analysis has been performed to show how the variation in soil size domain effects on the behaviour of single pile under torsion load. The procedure which is adopted in the investigation depends on fixing all variables and changing one variable to show the impact of this variable on the pile response considering soil domain variation. From the investigation, it is obvious that the pile diameter, eccentricity and torsion load have a major influence on the pile response, while the pile length has a minor influence on the pile response. Here, the increase in pile diameter reduces the load transfer to the soil; also the increase in eccentricity increases the load transfer to the soil while the increase in soil domain reduces the pile response. When the torsion load increases the pile response increases too. The pile response refers to displacement, rotation, shear force and bending moment.
摘要单桩是一种结构单元,在支撑上部结构的任何部分方面都起着重要作用。本文采用ANSYS三维有限元建模,研究了土体尺寸域对桩径、桩长、荷载偏心率和扭转大小的影响。德鲁克-普拉格模型使用并描述了一种类型的土壤。数值分析表明,土体尺寸域的变化如何影响单桩在扭转荷载下的性能。研究中采用的程序取决于固定所有变量并改变一个变量,以显示考虑土域变化时该变量对桩响应的影响。研究表明,桩径、偏心距和扭转荷载对桩的响应影响较大,而桩长对桩的反应影响较小。这里,桩径的增加减少了荷载向土壤的传递;偏心率的增加增加了荷载向土壤的传递,而土域的增加降低了桩的响应。当扭转载荷增加时,桩的响应也增加。桩的响应是指位移、旋转、剪切力和弯矩。
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引用次数: 1
Post COVID-19 Access-Egress Attributes for Urban Metro Transit Users in Delhi 新冠肺炎后德里城市地铁用户访问进度属性
IF 1.1 Pub Date : 2022-05-01 DOI: 10.2478/jaes-2022-0009
Salman Khursheed, F. A. Kidwai
Abstract The BLUE line of Delhi Metro (DM) has been examined to identify the post COVID-19 access–egress attributes of users. An on-board survey of metro commuters is conducted in February and March 2021. The respondents reported six different modes for access and egress trips to nearest metro stations with 38.7% and 43% users opting for walking for access-egress trip respectively. The E-rickshaw is observed to be most preferred para-transit mode whereas private vehicle has small mode share for access-egress trip. It is revealed that 46.5% of respondents are captive riders whereas 51% owns at least one motorized private vehicle. The average access and egress distance covered by walking is (0.81+ 0.32/0.35) Km respectively. The average access and egress trip time by walking is (11.19+3.73) and (11.07+4.45) minutes respectively. The average access and egress trip time by E-rickshaw is (13.21+4.09) and (12.56+2.95) minutes respectively. The access and egress trip time by motorized modes are in the range of (12.36-14.39) and (10.41-13.56) minutes respectively. The average main haul distance across all access-egress modes is observed to be (19.69+11.19) Km. To understand the factors influencing the access–egress mode choice multinomial logistic (MNL) regression models are proposed. The access-egress time and distance are observed to be significant factors in access-egress mode choice. Less parking facility offered by DM is significant factor in access mode choice. Occasional commuters are only significant factor in context with frequency of travelling in DM.
对德里地铁(DM)蓝线进行检测,以识别用户在COVID-19后的进出属性。在2021年2月和3月对地铁通勤者进行了一项车上调查。受访者报告了六种不同的进出方式,分别有38.7%和43%的用户选择步行前往最近的地铁站。电动人力车被认为是最受欢迎的辅助交通方式,而私家车的出入口出行模式份额较小。46.5%的受访者为自保乘客,51%的受访者拥有至少一辆机动私家车。步行的平均进出距离分别为(0.81+ 0.32/0.35)Km。步行进入和出口的平均行程时间分别为(11.19+3.73)和(11.07+4.45)min。三轮车的平均出入口行程时间分别为(13.21+4.09)分钟和(12.56+2.95)分钟。机动方式的出入口行程时间分别为(12.36 ~ 14.39)min和(10.41 ~ 13.56)min。观测到所有进出模式的平均主运输距离为(19.69+11.19)Km。为了了解影响进出模式选择的因素,提出了多项式逻辑回归模型。进出时间和距离是影响进出模式选择的重要因素。DM提供的停车设施较少,是影响用户选择门禁方式的重要因素。偶尔通勤者是DM中唯一重要的出行频率因素。
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引用次数: 0
Compact Testing of Total Station Instruments Using Folded Optics 利用折叠光学对全站仪进行紧凑测试
IF 1.1 Pub Date : 2022-05-01 DOI: 10.2478/jaes-2022-0011
V. Pagounis, N. Merlemis, D. Anastasiou, O. Arabatzi, V. Zacharis, M. Tsakiri
Abstract An optimized compact-based method is introduced that verifies the distance measuring precision of surveying instruments. The paper describes the improvement of the compact based method not only in establishing a compact facility by using shorter lengths and folded path but also in the assessment process by implementing the official ISO standard for electronic distance measuring equipment (ISO 17123-4). The method produces statistically comparable results to ISO standards and is suited for regular instrument checks in institutions with limited space available.
摘要介绍了一种优化的基于紧凑型的测量仪器测距精度验证方法。本文介绍了基于紧凑型的方法的改进,不仅在通过使用较短的长度和折叠路径建立紧凑型设施方面,而且在通过实施电子测距设备的官方ISO标准(ISO 17123-4)的评估过程中。该方法产生了与ISO标准具有统计可比性的结果,适用于可用空间有限的机构的定期仪器检查。
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引用次数: 0
User Expectation and Benefits of Implementing Artificial Intelligence in the UAE Energy Sector 用户期望和在阿联酋能源部门实施人工智能的好处
IF 1.1 Pub Date : 2022-05-01 DOI: 10.2478/jaes-2022-0001
Hassan Ali Hassan Altaffaq Almarashda, I. Baba, A. A. Ramli, A. Memon
Abstract Energy is one of the most fundamental elements to drive economic development. Therefore, it is a significant element of the economic development of UAE. United Arab Emirates (UAE) is keen to exploit the benefits of AI to deliver clean, secure, affordable energy. Thus this paper studied the benefits and user expectations if AI is adopted in the energy sector. This was achieved through a questionnaire amongst the personnel working in the energy sector. From the analysis of 350 completed questionnaire form, this was found that “AI able to increase employees’ job performance”; “AI able to improve the customer retention” and “AI bring positive impact to the organization” are three significant benefits of AI implementation in energy sector. Similarly, “Using AI Technology fits well with the way I work”, “Interacting with AI Technology is often frustrating” and “Assistance is available if facing difficulty using AI Technology” are three major expectations of the users. Further, the difference of the opinions amongst the respondent groups with different level of working experience and working positions was presented based on comparing means. The findings of this study will encourage the practitioners to implement AI in energy sector. This will also enhance the performance of the energy sector.
摘要能源是推动经济发展的最基本要素之一。因此,它是阿联酋经济发展的一个重要因素。阿拉伯联合酋长国(UAE)热衷于利用人工智能的优势,提供清洁、安全、负担得起的能源。因此,本文研究了人工智能在能源领域应用的好处和用户期望。这是通过对能源部门工作人员进行问卷调查实现的。通过对350份已完成的问卷表的分析,发现“人工智能能够提高员工的工作绩效”;“人工智能能够提高客户留存率”和“人工智能为组织带来积极影响”是人工智能在能源领域实施的三大好处。同样,“使用人工智能技术非常适合我的工作方式”、“与人工智能技术互动往往令人沮丧”和“如果在使用人工智能科技时遇到困难,可以提供帮助”是用户的三大期望。此外,基于比较方法,提出了不同工作经验和工作职位水平的受访者群体的意见差异。这项研究的结果将鼓励从业者在能源行业实施人工智能。这也将提高能源部门的业绩。
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引用次数: 2
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Journal of Applied Engineering Sciences
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