Single steel roof purlins housing projects will be part of the force by the system, in use, it needs to withstand the following three loads.oad)

Housing weight single steel roofing materials (including waterproofing, insulation or insulation and other support, as well as purlins weight of the structure.

2. Variable load (live load)

Story steel building roofs uniform live load, snow load, wind load fouling loads, steel roofing uniformly distributed live load standard value (calculated by volume projection): profiled steel sheet roof and other light Press Info Loaded horizontal projection area accessible for purlins and generally 0.5kn / m, the foamed cement composite panels for the roof 0.5kn / m; snow load and accumulated ash load press the "civil structure load standard" or local data access.

For purlin distance of less than 1m purlins, there should be checking 1.0kn (standard value), the construction or maintenance of concentrated loads acting on the strength of the cross when the member. For real abdominal purlins can be centralized maintenance Holland contained by 2 * 1.0al (kn / m) in terms of an equivalent uniform load, a horizontal projection of the purlin spacing (m), l is the purlin span (m).

3. Load Combinations

1) uniform live load and snow load without taking into account, whichever is greater design;

2) fouling load shall be uniformly distributed live load and snow load taking into account the higher value;

3) snow loads and loads fouling should be "building structural load specifications" consider increasing the coefficient of uneven distribution;

4) construction or maintenance without taking into account the concentrated loads and uniformly distributed live load or snow load;

5) to the flat sloping roof (slope of 1 / 8-1 / 20), may not be considered a positive wind pressure; when the wind load is large, should be checking under wind suction effect, permanent loads and load combinations of wind stress anti-sectional No. case, partial coefficients of permanent load at this time to take 1.0.