Experimental studies of wind-induced snowdrifts on typical single-span low-slope gable roofs
To investigate the wind-blown snowdrifts and snow loads on the typical low-slope gable roofs,a wind-snow combined experiment device was designed and carried out a series of tests with or without snowfall,where the heavy-density silica sand particle was used to mimic snow particle and the six incoming wind speeds(1.5～2.5 m/s for snowfall cases,4.6～6.1 m/s for no-snowfall cases)with four roof slope(5°,10°,15°,20°)variations were considered,and the total cases were 24,and the snow depth coefficient of cross-sectional,maximum snow depth coefficient and its location,uneven snow load coefficient,and net capture coefficient of snow particles on the roof were to be analyzed.The results showed that,in most cases,low-slope double-pitch roofs had a non-uniform snow distribution,significantly influenced by snowfall.For windward roofs,the snow depth decreased with higher wind speed and increased with a steeper slope.The maximum snow depth point moved away from the eaves as the wind speed increased,approaching linearly with a higher roof slope.Leeward roofs,due to the ridge sheltering effect,accumulated more snow with higher wind speeds.With an increased slope,the snow particle net capture coefficient on leeward roofs rose,indicating that snow particles transported over windward roofs were more likely to deposit on the leeward side,intensifying the non-uniformity of snow distribution on the roof.Based on the results,three brief snow load distribution patterns for low-slope gable roof,to provide a useful addition to the snow load design for such roofs.
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