footing slides
Post on 02-Apr-2018
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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.
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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.
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Wall footings are used to
support structural walls that
carry loads for other floorsor to support nonstructural
walls.
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Str ip footings
are the continuous
spread footings offoundation walls.
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Stepped footingsstrip
footings that change the
levels in stages toaccommodate a sloping
grade and maintain the
required depth in all
points around a building.
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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.
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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.
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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.
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Continuous footings
support a row of three or
more columns. They havelimited width and continue
under all columns.
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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.
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Pile capsare thick slabs
used to tie a group of piles
together to support andtransmit column loads to the
piles.
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NSCP 2010
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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.
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Determine the pressure distribution beneath the
footing based on its width
Perform a settlement analysis.
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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 -
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THATS ALL . . .THANK YOU. . .
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