Static Behaviour Of Corrugated Roofing Under Simulated Wind Loading
Mahendran, Mahen (1990) Static behaviour of corrugated roofing under simulated wind loading. Transactions of the Institution of Engineers, Australia. Civil engineering, 32(4), pp. As a first step to study the fatigue behaviour of light gauge corrugated steel roofing under cyclic uplift wind loading, experimental and finite element analyses of a number of two-span roofing assemblies with different spans and fastening systems were conducted under static loading conditions. Some interesting, but anomalous observations were noted for the most common system of fastening at alternate crests without cyclone washers. A local plastic failure occurred prematurely in the vicinity of the central support fasteners at approximately the same load per fastener for all the spans. The use of cyclone washers delayed this failure, especially for shorter span roofing. However, the roofing behaved in a totally different manner when fastened at every crest or at alternate valleys. Results from the experiments were compared with those obtained from the finite element analysis and the simple engineering theory. Citation counts are sourced monthly from Scopus. Web of Science® citation databases. These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database. No count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards. Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search. Full-text downloads displays the total number of times this work's files (e.g., a PDF) have been downloaded from QUT ePrints as well as the number of downloads in the previous 365 days. The count includes downloads for all files if a work has more than one.
Occupational exposure to polynuclear aromatic hydrocarbons (PAHs) was measured during roofing (SIC-2952) and paving (SIC-2951) operations. Sampling of raw materials was performed by extracting approximately 70 grams of hot mix paving asphalt or 0.5 grams of roofing asphalt or coal-tar (8007452) pitch with cyclohexane. The eluate was taken in acetonitrile. Analyzed by high pressure liquid chromatography (HPLC) for PAHs. PAH compounds studied were pyrene (129000), perylene (198550), benzo(g, h, I) perylene (191242), indeno(1,2,3-cd) pyrene (193395), benzo(a) pyrene (50328), 7,12-dimethylbenz(a) anthracene (57976), chrysene (218019), fluoranthene (206440), Benz(a) anthracene (56553), and benzo(k) fluoranthene (207089). Air sampling was performed using train assemblies consisting of an inlet with a binderless fiber glass filter or 0.8 micrometers of silver frit membranes. Air samples and raw materials from two asphalt paving, three asphalt roofing, and three coal-tar pitch roofing locations in Canada were chosen. The concentrations of PAHs and their total amounts in coal-tar pitch were at least 2 to 3 orders of magnitude higher than those found in asphalt. During asphalt paving, the average concentrations of PAHs in the ambient air sampled upwind far away from the paving location were in excess of 100 nanograms per cubic meter. Breathing zone air samples of work crews contained higher amounts of PAHs than those found in ambient air; the amounts of pentacyclic and hexacyclic aromatic hydrocarbons were about 3 to 8 times higher. During asphalt paving, the machine drivers were exposed to comparatively higher concentrations of PAHs than the applicators; kettle workers were nearly the same; during coal-tar roofing kettle workers were exposed to higher amounts than the applicators.
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