isolated footing
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Transcript of isolated footing
ISOLATED
FOOTINGS
This Powerpoint Presentation Was Prepared ByTeam 2:1) JANARDAN2) ADNAN
Footings Design
Typically, bottom of footing must be located below frost line
Footings must be designed to prevent bearing failure, sliding and overturning
Footings must be designed to prevent excessive settlement or tilting
Excavation may be required to reach a depth where satisfactory bearing material is located
Isolated footings
Isolated footings are provided under each
column and may be square, rectangular, or
circular in plan. Footing may be flat or tapered.
An isolated footing is used to support the load on a single column.
It is usually either square or rectangular in plan. It represents the simplest, most economical type and most widely usedfooting.
Isolated footings
In case of property line restrictions, footings may be designed for eccentric loading or combined footing is used as an alternative to isolated footing
Isolated footings
Types of isolated footings
1.Isolated square footing
2.Isolated rectangular footing
3.Isolated trapezoidal footing
Isolated Square Footing
Isolated or single column square footing – loads relatively light and columns not closely spaced
Maximum steel spacing may not exceed three times the footing thickness or 18 in.
Isolated Rectangular Footings
Square footings are more econonical than rectangular footings
Long direction steel is uniformly distributed along short direction
Short direction steel is non uniformly distributed along long direction
Isolated Rectangular Footings
This type of combined footing, shown in Figure 2, is sometimes used as an isolated spread foundation for a column that is required to carry a large load in a tight space.
The size of the trapezoidal footing that will generate a uniform pressure on the soil.
Isolated Trapezoidal Footing
Isolated Trapezoidal Footing
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