Snow Load Seismic Weight
Snow Load Seismic Weight
(OP)
ASCE 7 says to use 20% of any snow load greater than 30psf as seismic weight. This causes a problem for the 0.6D+0.7E load combination. The snow load acts as seismic weight, but does not resist uplift and overturning. Can't the 20% be used to resist uplift and overturning if it's included as seismic weight?






RE: Snow Load Seismic Weight
But you need to check everything without any snow, also.
RE: Snow Load Seismic Weight
It is clear snow can be out of sync with roof when an earthquake strikes but what we really are in lack of is in knowing how complete have been the investigations and calibrations to decide that some combinations represent the economically targeted safe structural limit to the behaviour that is also so consistent as to no permit to use the snow that is the loading as inertial mass; it is not neccesarily so, but I frankly doubt verily much the purported consistence of the codes we are one way or another being enforced to comply stands as stated and produce such homogeneously reliable structures as to require the tight-to the line interpretations of the same. Even the vertiginous changes in the codes must be showing that is the case.
RE: Snow Load Seismic Weight
I use this same logic with storage live loads
RE: Snow Load Seismic Weight
ANY FOOL CAN DESIGN A STRUCTURE. IT TAKES AN ENGINEER TO DESIGN A CONNECTION."
RE: Snow Load Seismic Weight
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Heh.
RE: Snow Load Seismic Weight
RE: Snow Load Seismic Weight
For large buildings in with large snow loads, this can add a considerable amount of load to the LFRS.
RE: Snow Load Seismic Weight
Sometimes we have to make our own decisions based on education and experience...
Don't most state boards have some wording along those lines...
RE: Snow Load Seismic Weight
Well it is just a logic thing for me, when building moves the snow is able to move. As such how can you determine if the snow is near the centre or outside of the building for over-turning and uplift. I should clarify this with the fact that I live in a tropical region that only see's snow on TV, as such I don't really have much knowledge of snow.
ANY FOOL CAN DESIGN A STRUCTURE. IT TAKES AN ENGINEER TO DESIGN A CONNECTION."