Transcription of Foundation Manual Chapter4, Footing Foundations
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Foundation Manual Chapter4, Footing Foundations
CHAPTER 4 OCTOBER 2015 CHAPTER 4 Footing Foundations 4-1 Introduction Footing Foundations , also known as spread, combined, or mat footings , transmit design loads into the underlying soil mass through direct contact with the soil immediately beneath the Footing . In contrast, pile-supported Foundations transmit design loads into the adjacent soil mass through pile friction, end bearing, or both. This chapter addresses Footing Foundations . Pile Foundations are covered in Chapter 5, Pile Foundations -General. Each individual Footing Foundation must be sized so that the maximum soil-bearing pressure does not exceed the allowable soil bearing capacity of the underlying soil mass. As the load-bearing capacity of most soils is relatively low (2 to 5 Tons per Square Foot (TSF)), the result is Footing areas that can be large in relation to the cross section of the supported member.
footing foundation also must be structurally capable of spreading design loads laterally over the entire footing area. Since the foundation is supported only by the supporting soil mass, the quality of the soil is extremely important. The contract specifications. 1 allow …
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