Fatigue failure of G550 steel building components during wind loading
Conference Publication ResearchOnline@JCUAbstract
Cyclone Tracy caused catastrophic damage in Darwin in 1974. A major component of damage was caused by low cycle fatigue of the cladding under the fixings, which resulted in extensive loss of light gauge metal roof cladding. In the damage investigation following Cyclone Larry, 2006, the CTS observed cases of fatigue failure of cladding. Studies carried out by Beck, Stephens, Mahendran and others found that such low-cycle fatigue failures occur within 10,000 load cycles and less than 50% of the static strength. These thin components manufactured from high strength steel, fail at points of stress concentration at fixings by crack formation and propagation in regions of large plastic deformation. Tests carried out by the CTS have shown that crack development is dependent not only on the load levels but also on the load sequence. Ginger and Henderson have shown that batten-truss connections are also subjected to fluctuating pressures with similar characteristics to cladding fasteners within the same parts of the roof and that G550 top-hat battens are also susceptible to similar load level dependent fatigue failures. Rogers and Hancock conducted a comprehensive study on the properties of Australian G550 material. However, there is a dearth of information on the crack initiation of this material adjacent to fasteners loaded in tension, for load cycles representative of wind loads. With the advent of sophisticated pressure loading systems that can simulate highly fluctuating wind loads in real time, the final paper will examine crack initiation of G550 material adjacent to fastener locations.
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Australasian Structural Engineering Conference 2008
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978-1-877040-69-6
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10
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Melbourne, VIC, Australia
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The Meeting Planners
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Melbourne, VIC, Australia
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