Infrastructure Engineering - Theses
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ItemAcute respiratory disorders and exposure to airborne contaminants in primary aluminium production( 1992)This report reviews the incidence of acute respiratory disorders in workers involved in production processes related to primary aluminium smelting, focusing on occupational asthma. Workplace exposure data quantifying contaminants capable of inducing respiratory disorders are presented. Possible sources of contamination include hydrogen fluoride, sulphur dioxide and fine dust fractions containing recycled impurities from emission control systems. Currently available control strategies based on these quantitative results are assessed. Critical comment is made on procedures currently in place to control workplace exposure and suggestions for improving engineering and work practices are summarised.
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ItemNon-current data and land information systems( 1986)Within the larger Land Information Systems (LIS) being developed in this is likely that several thousand records per day will be and thus become non-current. In order to minimise system country, it superceded, operating costs, the logical solution is to delete these data when they cease to be current, however this ignores any present or future value which they might have to other users. The purpose of this thesis is to examine the problems of non-current data produced in a LIS, such as: identifying the users; the law affecting records disposal; deciding which data are worthy of preservation; storage methods; costs and benefits; and the present policies being adopted by organisations establishing LIS, with respect to this subject. In addition, the practical aspects of archiving superceded graphical data were investigated during development of an historical Digital Cadastral Data Base - a system capable of displaying the parcellation of a region at any point in time since first settled.
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ItemSeismic performance of concrete beam-slab-column systems constructed with a re-usable sheet metal formwork system( 2007)This report describes an investigation of seismic performance of a ribbed slab system constructed with an innovative re-usable sheet metal formwork system. Experimental results from quasi-static cyclic lateral load tests on half-scale reinforced concrete interior beam-slab-column subassemblages are presented. The test specimen was detailed according to the Australian code (AS 3600) without any special provision for seismicity. This specimen was tested up to a drift ratio of 4.0 %. Some reinforcement detailing problems were identified from the first test. The damaged specimen was then rectified using Carbon Fibre Reinforced Polymer (CFRPs), considering detailing deficiencies identified in the first test. The repaired test specimen was tested under a lateral cyclic load as per the original test arrangement up to a drift level of 4%. The performance of the repaired specimen showed significant improvement with respect to the level of damage and strength degradation. The results of the rectified specimen indicate that the use of CFRPs may offer a viable retrofit/repair strategy in the case of damaged structures, where this damage may be significant. Two finite element analysis models were created and results of the first test were used to calibrate the FE model. The second FE model was used to obtain detail information about stress and strain behaviour of various components of the beam-column subassemblage and to check the overall performance before carrying out expensive lab tests. It was concluded that finite element modelling predictions were reliable and could be used to obtain more information compared to conventional type laboratory tests. Time-history analyses show that the revised detailing is suitable to withstand very large earthquakes without significant structural damage.