Abstract
This paper refers to the work carried out to determine local pressure coefficients appropriate for the design of multi-span gabled (folded) roofs of low buildings. In particular, a wind tunnel study was conducted to investigate the influence of roof slope and number of spans on local pressure coefficients measured on gabled roofs. Single-span, double-span and multi-span models were tested for roof slopes of 4:12 and 12:12. For both roof slopes, the values of mean and peak pressure coefficients measured in regions of the double-span and multi-span roofs were generally slightly greater than corresponding values for the single-span roof. However, maximum suctions measured near the ridge-edge of the 4:12 single-span model exceeded the double-span and multi-span data. On the other hand, suctions measured in the trough of the double-span and multi-span 12:12 models were more than 50% larger than corresponding data obtained with the single-span model. The single-span data generally agree with values or pressure coefficients specified by the National Building Code of Canada (1985) but some discrepancies have also been identified.
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