Roof Live Load Duration Factor

Factor is equivalent to the earlier use of a 1 3 wind load factor in that the newer wind load provisions of asce 7 98 include separate consideration of wind directionality by adjusting wind loads by an explicit wind directionality factor kd of 0 85. But that s probably where the understanding of load duration ends. If a building is designed for snow loads for example they probably know the roof trusses can be designed with a 1 15 load duration factor.

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