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    StructuralEngineeringReviewCourse FoundationsandRetainingStructures

    2016ProfessionalPublications,Inc. 1

    STRC2015ProfessionalPublications,Inc.

    StructuralEngineeringReviewCourse

    Foundationsand

    RetainingStructures

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    FoundationsandRetainingStructures

    LessonOverview

    Foundations

    and

    Retaining

    Structures

    StripFooting

    IsolatedColumnwithSquareFooting

    IsolatedColumnwithRectangularFooting

    CombinedFooting

    StrapFooting

    CantileverRetainingWall

    Counterfort RetainingWall

    2

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    FoundationsandRetainingStructures

    LearningObjectives

    You

    will

    learn strip,square,rectangular,combined,

    andstrapfootingdesignforflexure

    andshear

    cantileverandcounterfortretaining

    walldesign

    howtodealwithiterativeprocedures

    ontheSEexam

    3

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    FoundationsandRetainingStructures

    PrerequisiteKnowledge

    You

    should

    already

    be

    familiar

    with statics

    mechanicsofmaterials

    structuralanalysis

    basicreinforcedconcretedesign

    basicfoundationterminology

    4

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    FoundationsandRetainingStructures

    ReferencedCodesandStandards

    Building

    Code

    Requirements

    for

    Structural

    Concrete(ACI318,

    2011)

    InternationalBuildingCode(IBC,2012)

    5

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    FoundationsandRetainingStructures

    StripFooting

    B lengthoffootingparalleltowall

    e eccentricityofwallloadwithrespect

    tothecentroidofthefooting

    e eccentricityofwallloadwithrespect

    toedgeoffooting,L/2 e

    L lengthoffootingperpendicular

    towall

    P applied wallload

    q soilpressureduetounfactored loads

    nomenclature

    6

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    FoundationsandRetainingStructures

    StripFooting

    pressure

    distribution unfactored loads

    selfweightoffooting

    appliedloadfromwall

    ForfootingwithlengthB(parallelto

    wall),pressuredistributionisasshown

    onnextslide.

    Sizefootingsothatmaximumsoil

    pressureislessthanallowablesoilpressure.

    7

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    FoundationsandRetainingStructures

    StripFootingFigure2.1NetPressureDistributiononaFooting

    8

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    FoundationsandRetainingStructures

    Example:StripFootingExample

    2.1

    9

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    FoundationsandRetainingStructures

    Example:StripFooting

    10

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    FoundationsandRetainingStructures

    Example:StripFooting

    11

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    FoundationsandRetainingStructures

    StripFooting

    factoredsoilpressure

    factoredloads

    forceactingonfooting(netpressure)

    Selfweightoffootingproducesequal

    andoppositesoilpressure(cancelsoutandisnotincludedinnetpressure).

    soilpressureduetoappliedwallload

    only

    usedto

    determine

    flexure

    and

    flexure

    shear

    12

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    FoundationsandRetainingStructures

    Example:StripFooting

    Forthestripfootingshown,theapplied

    loadsPDandPLincludetheweightofthe

    wall.Determinethemaximumfactored

    netpressure.

    13

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    FoundationsandRetainingStructures

    Example:StripFooting

    1.2 1.6

    kips kips1.2 20 1.6 10

    ft ft

    40 kips ft

    40 ft-kips ftft-kips

    40ft 1 ft

    kips40

    ft

    u D L

    u

    P P P

    M

    Me

    P

    2

    61

    6 1kips40 1

    ft 12 ft

    1 ft 12 ft

    5 kips ft max

    eP

    LqBL

    12 ft2 ft6 6

    L

    6

    LeSince ,

    14

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    FoundationsandRetainingStructures

    StripFooting:CriticalSections

    c widthofwall

    d effectivedepthoffooting

    h depthoffooting

    nomenclature

    15

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    FoundationsandRetainingStructures

    StripFooting:CriticalSections

    Figure2.2

    Critical

    Sections

    for

    Flexure

    and

    Shear

    16

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    FoundationsandRetainingStructures

    StripFooting

    flexuresheardesign

    sameasforreinforcedconcretebeams,perACI318Sec.11.2

    flexuredesign

    sameasforreinforcedconcretebeams,perACI318Sec.10.2,withexceptions

    min=0.0018 [forgrade60bars]

    mainreinforcement,smaxmax [18in,3h]

    mainreinforcement, developmentlengthanchoragelength

    distributedreinforcement, smaxmax [18in,5h]

    17

    l d d

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    FoundationsandRetainingStructures

    Example:StripFootingExample

    2.3

    18

    St t l E i i R i C F d ti d R t i i St t

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    Example:StripFooting

    19

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    Example:StripFooting

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    FoundationsandRetainingStructures

    IsolatedColumnwithSquareFooting

    reinforcementdetails

    maximumspacing

    principalreinforcement

    s = 3h18 in

    distributionreinforcement