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OCR: Development of the Bell Footing Overview Why? History of footings The depth of the pier shaft is also usually condition of the Bell Development of ithe of the soil Two factors are commonly Footing load bearing capacity Pre-molded bell considered. One being the end bearing capacity of the pier, footings including the bell: the other being the friction between the Review sides of the shaft against the soil. These two factors have engineers divided as to which method is best for particular References structures and soil types. One benefit of belled piers the TEST resistance the bell provides pier uplift forces that can be applied by expansive soils and shear loads on the parts the building above ground. Steel reinforcing usually used in the concrete shaft IS engineered to resist any uplift fo ...