Journal of the South African Institution of Civil Engineering最新文献

{"title":"Eastern Cape employers' views on the strengths and weaknesses of civil engineering diplomates entering the workplace","authors":"F. Gerber, K. J. Mammen","doi":"10.17159/2309-8775/2019/V61N1A4","DOIUrl":"https://doi.org/10.17159/2309-8775/2019/V61N1A4","url":null,"abstract":"","PeriodicalId":54762,"journal":{"name":"Journal of the South African Institution of Civil Engineering","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47122011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The application of restructuring of knowledge in civil engineering","authors":"T. Verbeek, T. Bothma","doi":"10.17159/2309-8775/2019/V61N1A5","DOIUrl":"https://doi.org/10.17159/2309-8775/2019/V61N1A5","url":null,"abstract":"","PeriodicalId":54762,"journal":{"name":"Journal of the South African Institution of Civil Engineering","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47416642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimating elastic moduli of sandstones using two-dimensional pore space images","authors":"T. Ekneligoda","doi":"10.17159/2309-877s/2019/v61n3a6","DOIUrl":"https://doi.org/10.17159/2309-877s/2019/v61n3a6","url":null,"abstract":"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.","PeriodicalId":54762,"journal":{"name":"Journal of the South African Institution of Civil Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67483535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Implementation of a performance-grade bitumen specification in South Africa","authors":"S. Bredenhann, P. Myburgh, K. Jenkins, J. O'Connell, G. M. Rowe, J. D'angelo","doi":"10.17159/2309-8775/2019/v61n3a3","DOIUrl":"https://doi.org/10.17159/2309-8775/2019/v61n3a3","url":null,"abstract":"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.","PeriodicalId":54762,"journal":{"name":"Journal of the South African Institution of Civil Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67482603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Validating traffic models using large-scale Automatic Number Plate Recognition (ANPR) data","authors":"A. Robinson, C. Venter","doi":"10.17159/2309-8775/2019/v61n3a5","DOIUrl":"https://doi.org/10.17159/2309-8775/2019/v61n3a5","url":null,"abstract":"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","PeriodicalId":54762,"journal":{"name":"Journal of the South African Institution of Civil Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67482631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Economic benefit of ensuring uninterrupted water supply during prolonged electricity disruptions – City of Tshwane case study","authors":"J. Potgieter, C. Herold, M. Dijk, J. Bhagwan","doi":"10.17159/2309-8775/2019/v61n4a2","DOIUrl":"https://doi.org/10.17159/2309-8775/2019/v61n4a2","url":null,"abstract":"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.","PeriodicalId":54762,"journal":{"name":"Journal of the South African Institution of Civil Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67482673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Developing a hydraulic jump length model on horizontal rough beds","authors":"F. Yousefi, J. Mozaffari, S. Movahed","doi":"10.17159/2309-8775/2019/v61n3a1","DOIUrl":"https://doi.org/10.17159/2309-8775/2019/v61n3a1","url":null,"abstract":"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.","PeriodicalId":54762,"journal":{"name":"Journal of the South African Institution of Civil Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67482587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanical properties, durability characteristics and shrinkage of plain cement and fly ash concretes subjected to accelerated carbonation curing","authors":"R. Assaggaf, S. Adekunle, Shamsad Ahmad, M. Maslehuddin, O. Al-Amoudi, Syed Imran Ali","doi":"10.17159/2309-8775/2019/v61n4a7","DOIUrl":"https://doi.org/10.17159/2309-8775/2019/v61n4a7","url":null,"abstract":"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.","PeriodicalId":54762,"journal":{"name":"Journal of the South African Institution of Civil Engineering","volume":"10 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67482882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparing the factors of safety from finite element and limit equilibrium analyses in lateral support design","authors":"J. Potgieter, S. Jacobsz","doi":"10.17159/2309-8775/2019/v61n4a3","DOIUrl":"https://doi.org/10.17159/2309-8775/2019/v61n4a3","url":null,"abstract":"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.","PeriodicalId":54762,"journal":{"name":"Journal of the South African Institution of Civil Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67482713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Small-scale dispersed Green Infrastructure – a fitting civil engineering solution to stormwater quality improvement?","authors":"I. Brink","doi":"10.17159/2309-8775/2019/v61n4a4","DOIUrl":"https://doi.org/10.17159/2309-8775/2019/v61n4a4","url":null,"abstract":"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.","PeriodicalId":54762,"journal":{"name":"Journal of the South African Institution of Civil Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67482728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}