Sloped Roof Snow Loads Using Simulation
Sloped Roof Snow Loads Using Simulation
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DOI：
10.1061/(asce)0733-9445(1987)113:8(1820
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发表时间：
1987-08
期刊：
影响因子：
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通讯作者：
R. Sack;D. Arnholtz;Jess S. Haldeman
中科院分区：
文献类型：
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作者：
R. Sack;D. Arnholtz;Jess S. Haldeman
坡屋顶上的雪荷载受雪性质、气象因素和建筑参数的影响。建立了光滑屋面积雪的统计模型。屋面-积雪界面的滑动是由阻力减小或剪切破坏引起的；后者涉及减少积雪的剪切阻力。温度、温度-时间和降水被用作自变量，以根据现场和实验室数据开发滑动的条件概率。利用现有气象资料模拟深雪地区某地点的屋顶雪荷载，以获得温度和降水的发生概率。模拟设计载荷与ANSI A58.1-1982和爱达荷方法的值进行了比较。从现场和实验室数据模拟的屋顶荷载显示出良好的一致性，但两种设计方法产生的屋顶雪荷载远高于模拟值。
Snow loads on sloped roofs are influenced by snow properties, meteorological factors, and building parameters. A statistical model of snow accumulation for unobstructed slippery roofs is developed. Sliding at the roof-snow interface is initiated by either a reduction in the resisting forces or shear failure; the latter involves a reduction in the shear resistance of the snowpack. Temperature, temperature-time, and precipitation are used as independent variables to develop the conditional probabilities for sliding from field and laboratory data. Roof snow loads for a site in deep-snow country are simulated using existing meteorological data to obtain probabilities of occurence for temperature and precipitation. Simulated design loads are compared with values from ANSI A58.1-1982 and the Idaho approach. Roof loads simulated from field and laboratory data demonstrates good agreement, but the two design approaches yield roof snow loads that are considerably higher than the simulated values.