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An increasing number of liquid manure tanks are being covered to satisfy environmental considerations. If the roof of a liquid manure tank is at ground level, traffic loads should be allowed for in the design of such a roof. The Canadian Farm Building Code (1977) requires a minimum design uniform live load of 150 psf (7.18 kN/m2) for farm machinery traffic areas. If it is anticipated that the area will be occupied by loaded farm trucks or large tractors, larger design live loads have to be used. General traffic areas also have to be investigated for a concentrated load of 5,000 lb (240 kN). Liquid manure tanks may be rectangular or circular. The design of roof slabs for rectangular tanks is adequately covered in Section 11 of CSA A23.3-1973 where it concerns uniformly distributed loads. Design information for small circular tank roofs without columns and with a single central column is contained in a Portland Cement Association publication on circular concrete tanks without pre-stressing. Liquid manure tank roofs can be constructed of cast-in-place or precast concrete. The cast-in-place alternative has an advantage if the area in question will be subjected to concentrated loads. Unless precast units are interlocked in some way, each unit has to be designed for the concentrated design load or set of loads, whereas cast-in-place slabs have the ability to distribute concentrated loads over large areas consequently the uniformly distributed design load will govern in most cases.
design of liquid manure tank roof slabs
Jofriet, J.C. 1978. DESIGN OF LIQUID MANURE TANK ROOF SLABS. Canadian Agricultural Engineering 20(1):38-44.
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