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

Thank u