Snow load is an architectural term that refers to the snow pressure applied to the roof of a building or structure. The snow load on the roof of general industrial and civil buildings is formed by snow accumulation and is a spontaneous meteorological load. The size of the snow load value mainly depends on the amount of snowfall in each area, the form of the roof, the geometric size of the building, and the normal use of the building according to the meteorological data.
When considering snow loads, the following considerations should be followed:
1. According to the specification 50009-2012, it is necessary to consider the r-roof snow distribution coefficient, and the basic snow pressure multiplied by the snow cover coefficient is the standard value of snow load.
2. When designing the load-bearing components of the building structure and roof, the distribution of snow can be used according to the following provisions:
Roof panels and purlins are used in the most unfavorable case of uneven snow cover.
Roof trusses and arches can be used according to the uniform distribution of snow across the whole span, the uneven distribution and the uniform distribution of the half span, respectively.
Frames and columns can be used in a uniform distribution of snow across the entire span.
3. Pay attention to the weather forecast, do a good job in advance of bad weather on the building, and when there is snow in the north, the snow on the roof of the building should be cleaned up in time to reduce the load of the snow on the building, and the new building load after the snow melts in spring.
4. Inspect the building in time after the snow: appearance quality inspection, whether there is cracking of concrete components, whether the protective layer of steel reinforcement is loose, and whether the connection and nodes of components are corroded. The appearance quality inspection of steel components focuses on checking whether the welds of steel roof components and column head embedded parts are loose and corroded.