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Example: Pile cap design.Twittear 0 5

A pile cap is required to transfer the loadfroma400mm400mmcolumntofour600mmdiameterpiles,as shown inFig.14.30.

Pile caps can be designed either by thetrussanalogyorbybendingtheory(seeBS8110: Part 1: 3.11.4.1(5)). In thisexamplebendingtheorywillbeused.

Forapile capwith closely spacedpiles, inadditiontobendingandbondstresschecks,acheckshouldbemadeonthelocalshearstress at the face of the column, and abeam shear check for shear across the

widthofthepilecap.Formorewidelyspacedpiles(spacing>3diameter),apunchingshearcheckshouldalsobecarriedout.

LocalshearcheckTheultimatecolumnloadisPu=6400kN.

Lengthofcolumnperimeterisu=2(400+400)=1600mm.

Theshearstressatthefaceofthecolumnis

BendingshearcheckInaccordancewithBS8110:Part1:3.11.4.3,shearischeckedacrossasection20%ofthediameterofthepile(i.e.D/5)insidethefaceofthepile.ThisissectionAAinFig.14.30.

Theshearforceacrossthissectionignoringtheselfweightofthepilecap,whichissmallincomparisonisgivenby

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Thecorrespondingshearstressisgivenbyvu=Vu/bvd,wherebvisthebreadthofsectionforreinforcementdesign.

InaccordancewithBS8110:Part1:3.11.4.4,thismustnotexceed(2d/av)vcwhereavisdened inFig.14.30 and vc is thedesign concrete shear stress fromBS8110:Part1:Table3.8.Thus

For grade C35 concrete, from BS 8110: Part 1: Table 3.8, assuming six T25 bars, theminimumvalueofvcis0.4N/mm2,giving

Thus,provided theaverageeffectivedepthexceeds d=846mm(the localshearcheck),minimumreinforcementtosatisfybondandbendingtensionrequirementswillbeadequateinthisinstance.

Thenecessarydepthforthepilecapish=d+25(diameterbar)+75(cover)=846+100=946mmuseh=950mm

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CivilaxCEZsaid...

DownloadPileCAPDesignSpreadsheethttp://www.civilax.com/pilecapdesignspreadsheetseurocode2en199212004/

February21,2015at6:48PM

CivilaxCEZsaid...

DownloadPileCAPDesignSpreadsheethttp://www.civilax.com/pilecapdesignspreadsheetseurocode2en199212004/

February21,2015at6:48PM

mandirirahayusentosasaid...

wawcomplicatedcalculationsalsoaboutpilling

March8,2015at7:16AM