Design Values for the Thermal Loading of Concrete Roofs


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Title: Design Values for the Thermal Loading of Concrete Roofs

Author(s): Malcolm J.S. Hirst

Publication: Journal Proceedings

Volume: 81

Issue: 6

Appears on pages(s): 594-600

Keywords: buildings; concrete slabs; loads (forces); reinforced concrete; roofs; solar heating; structural design; temperature measuring instruments; thermal properties.

Date: 11/1/1984

An experimental investigation temperature measurements with described which links short-term long-term meteorological record to provide design values for the thermal loading of a concrete roof slab heated by solar radiation. The temperature profile of a 150 mm roof slab was monitored hourly for a year. Then daily extreme values of effective temperature and thermal moment were computed from the experimental slab. Finally, record to characterize these measured loading the structural response of the parameters were correlated with standard daily meteorological data. The resulting regression equations were than used to compute loading parameters from a 24-year weather record. Statistical analysis of this data gives a set of design values for thermal loading with defined return periods. Such values permit the code writer to select appropriate characteristic values of known probability of occurrence for the different limit states.