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Chapter 5 Footing Design - Engineering

1 Chapter 5 Footing Design By S. Ali Mirza1 and William Brant2 Introduction Reinforced concrete foundations, or footings, transmit loads from a structure to the supporting soil. Footings are designed based on the nature of the loading, the properties of the Footing and the properties of the soil. Design of a Footing typically consists of the following steps: 1. Determine the requirements for the Footing , including the loading and the nature of the supported structure. 2. Select options for the Footing and determine the necessary soils parameters. This step is often completed by consulting with a Geotechnical Engineer. 3. The geometry of the foundation is selected so that any minimum requirements based on soils parameters are met.

For structural members resisting earthquake loads, if the nominal shear strength is less than the shear corresponding to the development of nominal flexural resistance, then; φshear = 0.6 Mn = 61.9 ft-k/ft and the corresponding Vfn = 18.6 k/ft Vc =2 4000(12)(17.5)/1000 = 26.5 k/ft > Vfn = 18.6 k/ft Therefore, the use of φshear = 0.75 above is ...

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