live load of roof supporting water tanks
live load of roof supporting water tanks
(OP)
In ASCE chapter 4 they give live load of 20psf for ordinary flat roof.does this load takes into account the load of water tanks that might be usualy placed on top of a building?if water tanks of 3000L are placed what would be the live load?how can I calculate it?
RE: live load of roof supporting water tanks
If the location of the tank is unknown at the time of design, you have to make sure anywhere around the roof can take this load, on top of typical roof live load.
RE: live load of roof supporting water tanks
Also is there any maximum size of tanks to be able to consider live load of roof given in ASCE sufficient?
RE: live load of roof supporting water tanks
RE: live load of roof supporting water tanks
In short - the 20psf live load is NOT for water tanks. A water tank is a unique applied load and should be treated carefully. Ask questions, find out what the actual load from the tanks are, and how many you'll have.
RE: live load of roof supporting water tanks
In my area, cylindrical metal or plastic tanks are common, which do sit on a frame. The point loads are important. Most frames have at least 4 legs, so you could consider 7.5kN or 1.7kips (unfactored) at each leg. The spacing of those legs will depend on whether your tanks are horizontal or vertical -- but they're often around 0.8m.
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