Wednesday, December 19, 2012

Shallow Mass Concrete Pads.

Shallow mass pads consist of mass concrete pads supporting point loads from columns, piers, etc. (see Fig. 9.10).

They are used for varying conditions of sub-strata where suitable load-bearing soils exist at shallow depths below the effects of frost and general weathering. They are particularly economic where the side of the excavation can be used as a shutter and where a suitable depth of mass can be accommodated to disperse the load without the need for reinforcement. The general assumption for load dispersion is as mentioned previously i.e. a 45° spread through the mass concrete (see the typical example shown in Fig. 9.11).

Fig. 9.10 Shallow mass concrete pad.

Fig. 9.11 Load spread on mass concrete pad.

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