Loads: The Basis of Repeated Loading and Impact Loading Criteria
Date
1978
Authors
Beck, V.R.
Journal Title
Journal ISSN
Volume Title
Publisher
James Cook University of North Queensland
Abstract
Description
The 10,000 cycle criterion, as employed in the Darwin Area Building
Manual (Darwin Reconstruction Commission, 1975), is recognized as an oversimplification
of the actual wind loading occurring on the roof of a building.
The criterion does however provide an effective comparative test which
distinguishes between sheet-fastener assemblies according to their sensitivity
to repeated loading (Morgan and Eeck,~1977).
The purpose of this investigation is to assess the relevance of the
10,000 cycle criterion and to suggest possible alternative loading criteria.
To achieve these objectives a loading history was devised which attempted to
simulate fatigue-damaging effects of random wind-loading on roof cladding.
To validate this simulation the loading history was applied to test specimens
of roof cladding and the resulting failures were compared with those observed
in Darwin following cyclone 'Tracy'. Having validated the loading history it
was expected that it would then be possible to assess the relevance of the
10,000 cycle criterion, and to suggest alternatives if appropriate.
Keywords
Tornado, Tropical Cyclone, Wind Damage, Roof Damage, Roof Cladding, Wind Load