Concrete cover of 75 mm is necessary when the concrete is cast against soil.ġ1. In sloped, stepped, or tapered foundation, location and depth steps and angle of slope should satisfy design requirements at each section.ġ0. The depth of the footing should be in such a manner that the shear strength of the concrete remains equivalent or surpasses the critical shear forces (one-way shear and punching shear) developed with factored loads.ĩ. As per ACI 318-14 section 13.3, depth of footing over reinforcement should not remain under 150 mm.Ĩ. There should be sufficient anchorage length of both flexural and dowel reinforcement to get rid of bond failure of the dowels in the footing and to resist failure of the lap splices among the dowels and the column bars.ħ. Adequate anchorage should be arranged for tension reinforcement if reinforcement stress is not directly relative to the moment like in sloped, stepped or tapered foundation.Ħ. There should be least reinforcement even if the concrete bearing strength is not crossed.ĥ. Factored forces and moments provided at the base of columns are transmitted to the foundation with reinforcement, dowels, anchor bolts, or mechanical connectors.Ĥ. With adherence to ACI 314-14 section 20.2.1.1, the deformed type steel bars should be used.ģ. As per ACI 318-14, least concrete compressive strength should be 17MPa for normal applications.Ģ. The compressive strength of concrete should satisfy the needs for both strength and stability. The design of isolated footing is made on the basis of the guidelines set by ACI 318-14.ġ. Reinforcement details of footing with a satisfactory moment and shear force review. The design of isolated footing is made for the following purposes :. The isolated footing is arranged underneath the column to disperse the loads securely to the bed soil. Isolated footing is categorized as pad footing and sloped footing. It is cost-effective and suitable when the columns are placed at comparatively long distances, loads operating on footings are less and the safe bearing strength of the soil usually remains high. Thickness of footing and reinforcement are arrived by designing the footing slab as cantilever for the upward pressure exerted by the soil.However ready reckoners can be made use of.ĭepth footing can be calculated based on bending moment one way shear and punching shear consideration.However depth of footing can be calculated using the following approximate method.Isolated alias single footing is utilized to provide support to single RCC columns. Size of square footing in plan = √A =√8.80 = 3m x 3m However it is highly recommended to conduct soil test by soil experts for abopting the SBC and type of foundation before execution.

Isolated foundation design spreadsheet