footing slides

7/27/2019 footing slides

1/19


2/19

Definition

Footings are structural members used to support

columns and walls and to transmit and distributetheir loads to the soil in such a way that the load

bearing capacity of the soil is not exceeded,

excessive settlement, differential settlement,or

rotation are prevented and adequate safetyagainst overturning or sliding is maintained.


3/19

Reinforced concrete is the most suited material for

footing for reinforced concrete and structural steel

buildings, walls, towers, bridges, and other

structures.Since the Bearing capacity of soils is normally low

(less than 400 kPa), and the load from a column or

wall is large (usually greater than 1000 kPa), the

footing spreads the column or wall pressure to the

soil by providing bigger bearing area, thus reducing

the bearing pressure within permissible values.


4/19

Wall footings are used to

support structural walls that

carry loads for other floorsor to support nonstructural

walls.


5/19

Str ip footings

are the continuous

spread footings offoundation walls.


6/19

Stepped footingsstrip

footings that change the

levels in stages toaccommodate a sloping

grade and maintain the

required depth in all

points around a building.


7/19

I solated or single footings

are used to support single

columns. This is one of themost economical types of

footings and is used when

columns are spaced at

relatively long distances.


8/19

Combined footingsusually

support two columns, or

three columns not in a row.Combined footings are used

when two columns are so

close that single footings

cannot be used or when one

column is located at or near

a property line.


9/19

Canti lever or strap footings

consist of two single

footings connected with abeam or a strap and support

two single columns. This

type replaces a combined

footing and is more

economical.


10/19

Continuous footings

support a row of three or

more columns. They havelimited width and continue

under all columns.


11/19

Rafted or mat foundation

consists of one footing

usually placed under the

entire building area. Theyare used, when soil bearing

capacity is low, column

loads are heavy single

footings cannot be used,piles are not used and

differential settlement must

be reduced.


12/19

Pile capsare thick slabs

used to tie a group of piles

together to support andtransmit column loads to the

piles.


13/19

NSCP 2010


14/19


15/19


16/19

Determine the most suitable and economic type

of foundation.

Determine the depth of the footings below theground level and the method of excavation.

Establish the allowable bearing pressure to be

used in design.

4

5

6


17/19

Determine the pressure distribution beneath the

footing based on its width

Perform a settlement analysis.

7

8


18/19

FOOTING

INSTALLATION REBAR IN FOOTING

FOOTING
http://localhost/var/www/apps/conversion/tmp/scratch_5/How%20to%20Use%20Rebar%20-%20YouTube.MP4http://localhost/var/www/apps/conversion/tmp/scratch_5/Fastfoot%C2%AE%20Residential%20Footing%20Installation%20-%20YouTube.FLVhttp://localhost/var/www/apps/conversion/tmp/scratch_5/Footings%20-%20YouTube.FLV


19/19

THATS ALL . . .THANK YOU. . .

Documents

footing slides