View
235
Download
0
Category
Preview:
Citation preview
7/24/2019 Module 9 Frosch
1/9
AmericanConcreteInstitute2015.Allrightsreserved.Nopartofthispublication
maybereproduced,copied,distributed,ortransmittedinanyform.
WWW.CONCRETE.ORG/ACI318
Chapter 13 - Foundations
ACI 318-14:
Reorganized for Design
WWW.CONCRETE.ORG/ACI318 2
Foundations
Chapter sub-headings
13.1 Scope
13.2 General
13.3 Shallow foundations
13.4 Deep foundations
7/24/2019 Module 9 Frosch
2/9
AmericanConcreteInstitute2015.Allrightsreserved.Nopartofthispublication
maybereproduced,copied,distributed,ortransmittedinanyform.
WWW.CONCRETE.ORG/ACI318 3
Scope of foundations
Shallow foundations
Strip
Isolated
Combined
Mat
Walls as grade beams
Deep foundations
Pile caps & piles
Drilled piers & caissons
13.1 Scope
13.2 General
13.3 Shallowfoundations
13.4 Deepfoundations
WWW.CONCRETE.ORG/ACI318 4
Critical sections
Location of Mu per Table 13.2.7.1
Location of Vu measure from location for Mu
in Table 13.2.7.1
Circular and regular polygon sectionstreated as square members
13.1 Scope
13.2 General
13.3 Shallowfoundations
13.4 Deepfoundations
d
Column,wall,or
pedestal
d/2
Moment
TwowayshearOneway
shear
d
Columnw/steel
baseplate
d/2
Moment
Criticalsectionlocations
TwowayshearOneway
shear
d
CMUwall
Moment
TwowayshearOneway
shear
d/2
t
t/4
7/24/2019 Module 9 Frosch
3/9
AmericanConcreteInstitute2015.Allrightsreserved.Nopartofthispublication
maybereproduced,copied,distributed,ortransmittedinanyform.
WWW.CONCRETE.ORG/ACI318 5
Shallow foundations
One-way shallow foundation
Ch. 7 & 9
Two-way isolated footings
Ch. 7 & 8
Square and rectangular
Banded reinforcement
13.1 Scope
13.2 General
13.3 Shallowfoundations
13.4 Deepfoundations
WWW.CONCRETE.ORG/ACI318 6
Banded reinforcement
Section 13.3.3.3(b)
s = 2/(+1)
= long/short
13.1 Scope
13.2 General
13.3 Shallowfoundations
13.4 Deepfoundations
short
short sAs 0.5(1s)As,As,minmaycontrol
Foundation
plan
view
7/24/2019 Module 9 Frosch
4/9
AmericanConcreteInstitute2015.Allrightsreserved.Nopartofthispublication
maybereproduced,copied,distributed,ortransmittedinanyform.
WWW.CONCRETE.ORG/ACI318 7
Minimum d = 12 in.
Design forces basedon forces at centers of
piles
Unless design by strut-
and-tie:
One-way shear 22.5
Two-way shear 22.6
Pile caps13.1 Scope
13.2 General
13.3 Shallowfoundations
13.4 Deepfoundations
WWW.CONCRETE.ORG/ACI318 8
Shear contribution from piles13.1 Scope
13.2 General
13.3 Shallowfoundations
13.4 Deepfoundations
dord/2 Criticalsection
forshear
dpile
V=entirereaction
dord/2 Criticalsection
forshear
dpile
V=0
Note:SeeCRSI
Handbook(1984)for
upperlimitonVnat
faceofcolumn.
7/24/2019 Module 9 Frosch
5/9
AmericanConcreteInstitute2015.Allrightsreserved.Nopartofthispublication
maybereproduced,copied,distributed,ortransmittedinanyform.
WWW.CONCRETE.ORG/ACI318 9
Chapter 18 Earthquake resistant structures
Beams
Columns
Beams
Columns
Twowayslabs
Precaststructuralwalls
Beams
Columns
Beamcolumnjoints
Momentframesusingprecastconcrete
Diaphragms
Membersnotpartofseismicforceresistingsystem
Structuralwalls
Foundations
IntermediateSystems(Min.forSDC C)
SpecialSystems(SDC D,E,F)
OrdinarySystems(Min.forSDC B)
WWW.CONCRETE.ORG/ACI318 10
Seismic requirements for foundations
Footings, mats, and pile caps18.13.2
Develop column and wall bars in tension
Hooked column bars turned toward center
Continue transverse reinforcement
Add top reinf. for uplift
d
Hooksinward
w/infoundationdepth
Columnorboundaryelement
Topreinf.required
foruplift
Transversereinf.
7/24/2019 Module 9 Frosch
6/9
AmericanConcreteInstitute2015.Allrightsreserved.Nopartofthispublication
maybereproduced,copied,distributed,ortransmittedinanyform.
WWW.CONCRETE.ORG/ACI318 11
Grade beams and slabs-on-ground18.13.3
For grade beams acting as horizontal ties
Anchor tie bars in column or foundation
Least dimension of n/20 but need not exceed 18in.
Closed ties at smaller of beam dimension and12 in.
Grade beams resisting flexure from columns
detailed as beams18.6
Slabs acting as diaphragms18.12
WWW.CONCRETE.ORG/ACI318 12
5dpile 6ft
Piles, piers, and caissons18.13.4
Transverse reinforcement
required for:
5dpile from top, not lessthan 6 ft below bottom ofpile cap
Where not laterallysupported
Pile
cap
7/24/2019 Module 9 Frosch
7/9
AmericanConcreteInstitute2015.Allrightsreserved.Nopartofthispublication
maybereproduced,copied,distributed,ortransmittedinanyform.
WWW.CONCRETE.ORG/ACI318 13
Chapter 14 - Plain Concrete
ACI 318-14:
Reorganized for Design
WWW.CONCRETE.ORG/ACI318 14
Plain concrete
Chapter sub-headings
14.1 Scope
14.2 General
14.3 Design limits
14.4 Required strength
14.5 Design strength
14.6 Reinforcing detailing
14.1 Scope
14.2 General
14.3 Designlimits
14.4 Requiredstrength
14.5 Designstrength
14.6 Reinforcementdetailing
7/24/2019 Module 9 Frosch
8/9
AmericanConcreteInstitute2015.Allrightsreserved.Nopartofthispublication
maybereproduced,copied,distributed,ortransmittedinanyform.
WWW.CONCRETE.ORG/ACI318 15
Scope of plain concrete
Members in building and
non-building structures
Permitted only in:
Continuously supportedmembers
Members where arch actionprovides compression in allloading conditions
Walls
Pedestals
14.1 Scope
14.2 General
14.3 Designlimits
14.4 Requiredstrength14.5 Designstrength
14.6 Reinforcementdetailing
WWW.CONCRETE.ORG/ACI318 16
Scope of plain concrete
Chapter does not govern:
Cast-in-place piles
Piers
Specifically not permitted for:
Columns
Pile caps
14.1 Scope
14.2 General
14.3 Designlimits
14.4 Requiredstrength
14.5 Designstrength
14.6 Reinforcementdetailing
7/24/2019 Module 9 Frosch
9/9
AmericanConcreteInstitute2015.Allrightsreserved.Nopartofthispublication
maybereproduced,copied,distributed,ortransmittedinanyform.
WWW.CONCRETE.ORG/ACI318 17
Plain concrete axial strength
318-11
318-14
*
14.1 Scope
14.2 General
14.3 Designlimits
14.4 Requiredstrength14.5 Designstrength
14.6 Reinforcementdetailing
WWW.CONCRETE.ORG/ACI318 18
At window and door openings
At least two No. 5 bars
Extend 24 in. beyond corners
14.1 Scope
14.2 General
14.3 Designlimits
14.4 Requiredstrength
14.5 Designstrength
14.6 Reinforcementdetailing
24in.
2No.5bars2No.5bars
Recommended