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

Citation