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Eastern Cape employers' views on the strengths and weaknesses of civil engineering diplomates entering the workplace 东开普省雇主对土木工程文凭进入职场的优势和劣势的看法
IF 0.4 4区 工程技术 Q4 ENGINEERING, CIVIL Pub Date : 2019-03-01 DOI: 10.17159/2309-8775/2019/V61N1A4
F. Gerber, K. J. Mammen
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引用次数: 1
The application of restructuring of knowledge in civil engineering 知识重组在土木工程中的应用
IF 0.4 4区 工程技术 Q4 ENGINEERING, CIVIL Pub Date : 2019-03-01 DOI: 10.17159/2309-8775/2019/V61N1A5
T. Verbeek, T. Bothma
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引用次数: 1
Estimating elastic moduli of sandstones using two-dimensional pore space images 利用二维孔隙空间图像估计砂岩弹性模量
IF 0.4 4区 工程技术 Q4 ENGINEERING, CIVIL Pub Date : 2019-01-01 DOI: 10.17159/2309-877s/2019/v61n3a6
T. Ekneligoda
DR THUSHAN C EKNELIGODA completed his PhD at the Royal Institute of Technology in Sweden. Then he worked in the industry for two years as a senior research engineer before moving to academia. He obtained his post-doctoral qualifications both from Seoul National University and the University of Nottingham. Currently he is a senior lecturer at the School of Civil and Environmental Engineering at the University of the Witwatersrand in Johannesburg.
THUSHAN C EKNELIGODA博士在瑞典皇家理工学院完成了他的博士学位。然后,他在进入学术界之前,作为高级研究工程师在该行业工作了两年。他获得了首尔国立大学和诺丁汉大学的博士后资格。目前他是约翰内斯堡威特沃特斯兰德大学土木与环境工程学院的高级讲师。
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引用次数: 0
Implementation of a performance-grade bitumen specification in South Africa 在南非实施性能级沥青规范
IF 0.4 4区 工程技术 Q4 ENGINEERING, CIVIL Pub Date : 2019-01-01 DOI: 10.17159/2309-8775/2019/v61n3a3
S. Bredenhann, P. Myburgh, K. Jenkins, J. O'Connell, G. M. Rowe, J. D'angelo
STEPH J BREDENHANN (Pr Eng, Pr CPM) matriculated at Upington High School in 1972, graduated in 1977 from Stellenbosch University and completed his Master’s degree in 2000. He started his career at the Sishen Iron Ore Mine in the industrial engineering field, and later joined the Kimberley City Council before he moved to a consulting engineering firm, Entech Consultants, in Stellenbosch, where he was a director. He became a regional director of WSP Consulting Engineers, then joined Goba Consulting Engineers as technical director before he joined SANRAL as the Western Region Project Manager for Research. He specialises in pavement and materials engineering. He is a Fellow of the South African Institution of Civil Engineering, as well as of the Society for Asphalt Technology.
stephen J BREDENHANN, 1972年进入Upington High School, 1977年毕业于Stellenbosch University,并于2000年获得硕士学位。他的职业生涯始于工业工程领域的思深铁矿,后来加入金伯利市议会,之后他转到Stellenbosch的咨询工程公司Entech Consultants担任董事。他成为WSP咨询工程师的区域总监,然后加入Goba咨询工程师担任技术总监,然后加入SANRAL担任西部地区研究项目经理。他专攻路面和材料工程。他是南非土木工程学会(South African Institution of Civil Engineering)和沥青技术学会(Society for Asphalt Technology)的会员。
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引用次数: 6
Validating traffic models using large-scale Automatic Number Plate Recognition (ANPR) data 使用大规模自动车牌识别(ANPR)数据验证交通模型
IF 0.4 4区 工程技术 Q4 ENGINEERING, CIVIL Pub Date : 2019-01-01 DOI: 10.17159/2309-8775/2019/v61n3a5
A. Robinson, C. Venter
INTRoduCTIoN Automatic Number Plate Recognition (ANPR) entails the automated recording of the number plate, date/time and location of each vehicle that passes a roadside camera, using vehicle number plate recognition software. Records of individual vehicles that pass multiple cameras can be matched to determine the path of the vehicle and calculate travel times between the survey locations. If cameras are in a closed cordon, the origin and destination of external trips passing through the cordon can be determined. A series of ANPR cameras along a route, or at strategic locations throughout a network, would not observe every vehicle upon entry and exit to the network, and constitutes an open format number plate survey. Both closed and open format ANPR data have the potential to provide information that can be useful during the development of strategic traffic models, in ways that are not possible with other sources of traffic data. Comprehensive traffic observations from loop detectors, like ANPR, provide link speed and volume information which is useful during the calibration and validation of traffic models. But the additional ability of ANPR to track individual vehicles from point to point also provides potentially useful data on the distribution of trips through the network. While this constitutes partial rather than comprehensive origin-destination (OD) data, it may still serve as an additional independent data set against which model outputs can be validated. ANPR data has rarely been used in this way. The objective of this paper is to examine the use of ANPR data for traffic model validation in terms of its comprehensiveness and accuracy. ANPR data is provided by the South African National Roads Agency SOC Ltd (SANRAL) from the Open Road Tolling (ORT) system deployed on the Gauteng Freeway Improvement Project (GFIP). Selected link volumes and journey times are, for demonstration purposes, compared with the GFIP traffic model’s 2015 forecasts. In addition, the trip distribution characteristics of the ANPR data are exploited by extracting partial OD and trip length distribution metrics for comparison with modelled quantities. This required the development of a new methodology to process traffic model outputs such that they are directly comparable to ANPR-derived partial OD data. This is a feature of model validation that has not been found in previous studies. Validating traffic models using large-scale Automatic Number Plate Recognition (ANPR) data
自动车牌识别系统使用车牌识别软件,自动记录每辆经过路边摄像头的车辆的车牌号码、日期/时间和位置。通过多个摄像头的单个车辆记录可以进行匹配,以确定车辆的路径,并计算在调查地点之间的行驶时间。如果摄像机位于封闭的警戒线内,则可以确定通过警戒线的外部行程的起点和目的地。沿着路线或在整个交通网络的重要地点安装一系列的自动定位系统摄影机,并不会观察每一辆进出交通网络的车辆,而是一种开放式车牌调查。封闭和开放格式的ANPR数据都有可能在战略交通模型的开发过程中提供有用的信息,这是其他交通数据来源无法做到的。环路探测器(如ANPR)的综合交通观测提供了链路速度和流量信息,这些信息在交通模型的校准和验证过程中非常有用。但是,ANPR从一个点到另一个点跟踪单个车辆的额外能力也提供了关于网络中行程分布的潜在有用数据。虽然这构成了部分而不是全面的起点-目的地(OD)数据,但它仍然可以作为一个额外的独立数据集,模型输出可以根据它进行验证。ANPR数据很少以这种方式使用。本文的目的是研究在交通模型验证中使用ANPR数据的全面性和准确性。ANPR数据由南非国家公路局SOC有限公司(SANRAL)从部署在豪登省高速公路改善项目(GFIP)上的开放道路收费(ORT)系统中提供。为演示目的,将选定的链路数量和行程时间与GFIP流量模型的2015年预测进行比较。此外,通过提取部分OD和行程长度分布指标,利用ANPR数据的行程分布特征与建模量进行比较。这就需要开发一种新的方法来处理交通模型的输出,使它们可以直接与anpr导出的部分OD数据进行比较。这是模型验证的一个特征,在以前的研究中没有发现。使用大规模自动车牌识别(ANPR)数据验证交通模型
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引用次数: 5
Economic benefit of ensuring uninterrupted water supply during prolonged electricity disruptions – City of Tshwane case study 在长期电力中断期间确保不间断供水的经济效益-茨瓦内市案例研究
IF 0.4 4区 工程技术 Q4 ENGINEERING, CIVIL Pub Date : 2019-01-01 DOI: 10.17159/2309-8775/2019/v61n4a2
J. Potgieter, C. Herold, M. Dijk, J. Bhagwan
DR CHRIS HEROLD (PrEng, FSAICE) specialises in water resources and water quality model development and assessment. His models have found wide practical application in catchment and systems analysis studies that have saved South Africa billions of rands. He is the author of 44 technical papers published locally and overseas and is the principal author of over 130 unpublished technical reports. Chris has actively participated in over a dozen Water Research Commission studies, most of which he has led. He obtained his BSc, MSc and PhD degrees at the University of the Witwatersrand. He formed Umfula Wempilo Consulting in 2000.
CHRIS HEROLD博士专门从事水资源和水质模型的开发和评估。他的模型在集水区和系统分析研究中得到了广泛的实际应用,为南非节省了数十亿兰特。他在本地和海外发表了44篇技术论文,并是130多篇未发表的技术报告的主要作者。克里斯积极参与了十多个水研究委员会的研究,其中大部分是他领导的。他在威特沃特斯兰德大学获得学士、硕士和博士学位。2000年,他成立了Umfula Wempilo咨询公司。
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引用次数: 0
Developing a hydraulic jump length model on horizontal rough beds 建立了水平粗糙层的水力跃变长度模型
IF 0.4 4区 工程技术 Q4 ENGINEERING, CIVIL Pub Date : 2019-01-01 DOI: 10.17159/2309-8775/2019/v61n3a1
F. Yousefi, J. Mozaffari, S. Movahed
INTRODUCTION A hydraulic jump causes kinetic energy dissipation downstream of the hydraulic structures, whenever the flow regime is changed from supercritical to subcritical flow. Stilling basins are considered for energy dissipation to reduce flow energy and create conditions for the occurrence of hydraulic jump in a specific position (Jain 2001). A significant parameter to determine hydraulic jump length is the bed roughness. The results of previous studies have shown that increasing the bed roughness may cause more energy dissipation and, accordingly, may change the hydraulic jump length. Peterka (1984), in the USBR laboratory, presented a graph (Lj/y2 vs Fr1) to determine hydraulic jump length based on numerous experiments in some channels. Ead and Rajarantnam (2002) investigated hydraulic jump over corrugated aluminium beds, and developed an empirical model. They found that hydraulic jump length over corrugated bed surfaces was approximately half the classical jump length. Izadjoo and Shafai-Bejestan (2007) studied hydraulic jump over four corrugated beds. Pagliara et al (2008) determined an equation for hydraulic jump length over both uniform and non-uniform rough beds in horizontal channels. In recent years, Chanson (2009), Alikhani et al (2010), Nasr Esfahani and Shafai Bajestan (2012), Imran and Akib (2013), and Riazi and Jafari (2014) have studied the effect of drop and barrier height, divergence angle of stilling basins and rough and corrugated bed on the characteristics of hydraulic jump and energy dissipation using dimensional analysis. Kumar and Lodhi (2016) investigated the effect of bed roughness heights on the characteristics of a hydraulic jump. They concluded that the bed roughness height has no considerable effect on hydraulic jump characteristics. Due to the impact of roughness on hydraulic jump, the main aim of this study was to develop a new model to estimate hydraulic jump lengths on horizontal rough beds using dimensional analysis and physical model tests.
当流型由超临界流转变为亚临界流时,水力跃变会引起水工结构下游的动能耗散。消力池用于消能,降低水流能,为特定位置发生水跃创造条件(Jain 2001)。决定水力跳跃长度的一个重要参数是河床粗糙度。以往的研究结果表明,增加河床粗糙度可以引起更大的能量耗散,从而改变水力跃变长度。Peterka(1984)在USBR实验室提出了一个图表(Lj/y2 vs Fr1),以确定在一些通道中进行的大量实验为基础的水力跳跃长度。Ead和Rajarantnam(2002)研究了波纹铝床的水力跳跃,并开发了一个经验模型。他们发现,波纹床表面上的水力跳跃长度大约是传统跳跃长度的一半。Izadjoo和shafaie - bejstan(2007)研究了四个波纹床的水力跳跃。Pagliara等人(2008)确定了水平河道中均匀和非均匀粗糙河床的水力跳跃长度方程。近年来,Chanson(2009)、Alikhani等(2010)、Nasr Esfahani和Shafai Bajestan(2012)、Imran和Akib(2013)、Riazi和Jafari(2014)利用量次分析的方法研究了落差和障壁高度、消力池发散角、粗糙层和波纹层对水跃特性和能量耗散的影响。Kumar和Lodhi(2016)研究了河床粗糙度高度对水力跳跃特性的影响。他们得出结论,河床粗糙度高度对水跃特性没有太大的影响。由于粗糙度对水跃的影响,本研究的主要目的是通过量纲分析和物理模型试验建立一个新的模型来估计水平粗糙床的水跃长度。
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引用次数: 2
Mechanical properties, durability characteristics and shrinkage of plain cement and fly ash concretes subjected to accelerated carbonation curing 素水泥和粉煤灰混凝土加速碳化养护的力学性能、耐久性和收缩率
IF 0.4 4区 工程技术 Q4 ENGINEERING, CIVIL Pub Date : 2019-01-01 DOI: 10.17159/2309-8775/2019/v61n4a7
R. Assaggaf, S. Adekunle, Shamsad Ahmad, M. Maslehuddin, O. Al-Amoudi, Syed Imran Ali
PROF SAHEED KOLAWOLE ADEKUNLE holds a PhD (Civil Engineering) from King Fahd University of Petroleum and Minerals, Saudi Arabia. Presently he is working as Assistant Professor in the Civil and Environmental Engineering Department at the same university. He has research expertise in the field of structural engineering, computational engineering, concrete science and engineering, finite element methods, meshless and hybrid numerical methods, software development for engineering analyses, and corrosion of steel reinforcement. He has published several research papers in ISI journals and has refereed conference proceedings.
SAHEED KOLAWOLE ADEKUNLE教授,毕业于沙特阿拉伯法赫德国王石油矿产大学土木工程专业。现为北京理工大学土木与环境工程系助理教授。他在结构工程、计算工程、混凝土科学与工程、有限元方法、无网格和混合数值方法、工程分析软件开发和钢筋腐蚀等领域具有研究专长。他在ISI期刊上发表了几篇研究论文,并担任会议论文集的评审。
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引用次数: 5
Comparing the factors of safety from finite element and limit equilibrium analyses in lateral support design 横向支护设计中有限元分析与极限平衡分析的安全系数比较
IF 0.4 4区 工程技术 Q4 ENGINEERING, CIVIL Pub Date : 2019-01-01 DOI: 10.17159/2309-8775/2019/v61n4a3
J. Potgieter, S. Jacobsz
JEAN-TIMOTHY POTGIETER earned BEng and Honours degrees in Civil Engineering from the University of Pretoria. He also obtained a Master’s degree in Geotechnical Engineering, researching the differences between complex and simple methods of analysis. Jean has five years’ work experience in civil engineering, specialising in geotechnical-related projects – he has worked in the fields of tailings dams, foundation design and site investigations in South Africa and on the African continent. He is currently studying towards an MBA degree at the University of Cape Town. He is also currently the vice-chair of the ISSMGE young person’s presidential group.
JEAN-TIMOTHY POTGIETER拥有比勒陀利亚大学土木工程学士和荣誉学位。他还获得了岩土工程硕士学位,研究复杂和简单分析方法之间的差异。Jean在土木工程方面有五年的工作经验,专门从事岩土工程相关项目——他曾在南非和非洲大陆从事尾矿坝、基础设计和现场调查等领域的工作。他目前正在开普敦大学攻读MBA学位。他目前也是ISSMGE青年主席小组的副主席。
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引用次数: 2
Small-scale dispersed Green Infrastructure – a fitting civil engineering solution to stormwater quality improvement? 小型分散的绿色基建-改善雨水水质的合适土木工程方案?
IF 0.4 4区 工程技术 Q4 ENGINEERING, CIVIL Pub Date : 2019-01-01 DOI: 10.17159/2309-8775/2019/v61n4a4
I. Brink
DR ISOBEL BRINK is a senior lecturer in the field of water quality within the Department of Civil Engineering at Stellenbosch University. She has published works on various topics related to water quality, including stormwater runoff quality, stream solute modelling and small-scale Point of Use systems for potable water improvement. Currently, her research is focused on the use of green infrastructure towards stormwater quality improvement.
ISOBEL BRINK博士是斯泰伦博斯大学土木工程系水质领域的高级讲师。她发表了许多与水质有关的著作,包括雨水径流水质、溪流溶质模型和用于改善饮用水的小规模用水点系统。目前,她的研究重点是利用绿色基础设施改善雨水质量。
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引用次数: 2
期刊
Journal of the South African Institution of Civil Engineering
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