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Design Example_ Deep Mass Concrete Pad Base
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6/19/2015 DesignExample:DeepMassConcretePadBase.|Builder'sEngineer
http://www.abuildersengineer.com/2013/01/designexampledeepmassconcretepad.html 1/5
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Design Example: Deep Mass Concrete Pad Base.Twittear 0 0
Asteelframedbuilding is tobebuilt onasiteadjoiningpreviously,wherevariablellextendsdowntothelevelofthebedrock.Aheavily loaded stanchion, carrying axialload only, is to be supported on a padfoundation.
It has been decided to found the heavilyloaded base in the sandstone bedrock, inorder tominimize settlement.Thebase istobeconstructedasamassconcretepad.
LoadingsThe superstructure working loads are asfollows:
AllowablebearingpressureFromDesign Example, the sandstone has a net allowable bearing pressure of na = 2000kN/m2.SizeofbaseThe foundation surcharge due to the groundbearing slab is small and can be neglected.Therefore,
Thereforea1.5m1.5mpadfoundationwillbeused,asshowninFig.11.15.
The stanchion bases are set at a common depth of 300 mm below slab level, and theremainingdepthofexcavationdowntothesandstonerockistakenupbythemassconcretebase.
Theminimumdepthofbaserequired,before itbecomesnecessaryforreinforcementtobeintroduced,is500mm(seedepthtoangleofloaddispersioninFig.11.15).Clearlyamassconcretebaseisadequateinthisinstance.
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6/19/2015 DesignExample:DeepMassConcretePadBase.|Builder'sEngineer
http://www.abuildersengineer.com/2013/01/designexampledeepmassconcretepad.html 2/5
Fig.11.15Massconcretepadbasedesignexample.
The choice between the full sized mass concrete pad and the stub column solution isdeterminedfromeconomicconsiderations.
The economic changeover point is where the crosssection required for groundbearingpurposesbecomesexcessivelywasteful intermsofthecostofconcretecomparedwiththecostofintroducingshutteringtoformthesmallercrosssection.Situationswherethiswouldapplyare:
(1)Wherethepadsareverydeep,(2)Wheretheallowablegroundbearingpressuresareverylow,or(3)Where,duetothenatureoftheground,ashutteredpadisrequiredinanycase.
The lower pad plan size is determined from the loading and the allowable groundbearingcapacity.Ifthesectionisreducedathigherlevel,thesizeatthepointwhereitisreducedisgenerallybasedupona45dispersionofloadthroughthemassconcrete(seeFig.11.16).
Fig.11.16Stubcolumnpadbase.
Theupperpedestal crosssection isdetermined from the load, theallowablebearing stressbelow the base plate and the allowable compressive stress on the mass concrete inconjunctionwithasuitablepracticalandeconomicsizeforconstruction.Forexample,thesizedetermined from stress considerations often needs to be rounded up to a larger practicalmass concrete crosssection particularly where the mass pier is relatively tall (see Fig.11.17).
LabelsFOUNDATIONS (134) PILES (61)STRUCTURES (58) WATERPROOFING (58)SOILS(47)FOOTINGS(30)SITEEXPLORATION(30)BUILDING(29)PADFOUNDATIONS (18)STRIPFOUNDATIONS(18)CONCRETE(15)RAFTFOUNDATIONS(14) DRILLED PIER FOUNDATIONS (13) RETAININGWALLS (10) EXCAVATIONS (9) SURFACE SPREADFOUNDATIONS(9)
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6/19/2015 DesignExample:DeepMassConcretePadBase.|Builder'sEngineer
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Categories:CONCRETE,PADFOUNDATIONS
Fig.11.17Masspiercriteria.
Related Post:CONCRETE
PADFOUNDATIONS
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