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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.

calculations to justify the use of straight bars. Note: εt = 0.040 > 0.005 for tension controlled sections and φ = 0.9 Use top bars #5 @ 13 in c/c arbitrarily designed to take approximately 40% of bending moment due to possible reversal caused by earthquake loads. 8# 5 top and bottom longitudinal bars will satisfy the requirement for ...

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