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1、西南交通大学基础工程课程设计当前位置：文档视界西南交通大学基础工程课程设计西南交通大学基础工程课程设计CONTENTSProblem-2Design-4ChapteroneUnitconversion-4ChaptertwoDesignloadcalculation-4ChapterthreeGeotechnicaldesigning-4Step1toStep9Allowablebearingpressuremethod-4Step10Checkingmomentload-8ChapterfourStructuraldesigning-8PartADeterminerequiredthickn
2、essbasedonatwo-wayshearanalysis-8Checkone-wayshear-9PartBDesigntheflexuralsteel-9ChapterfiveSketchofthedesignedfooting-11Figure2Thicknessandeffectivedepth-11Figure3Dimensionsandreinforcingsteel-11Figure4Innerblockandouterblock-12Figure5Structuralshow-12Problem:DesignforPracticeAproposedofficebuildin
3、gistobeconstructedatthesitewithageologicprofileshowedinfigure1.Thegroundtableisat5.5ft.Theshallowstrataareverysoft.Thedataforthesestratamaybeusedinfoundationdesignwereobtainedfromaseriesin-situtestsandlaboratorytests,andshowedintable1.Inthetable,Suisundrainedshearstrength;mispreconsolidationstress.F
4、ig.1geologicsectionfortheconstructionsiteThedesigncolumnsoftheproposedofficebuildingwillcarrythefollowingloads:deadverticalloadrange30-100k,liveverticalloadrange20-75k,anddeadloadmomentrange0-50ft-k.Thesecolumnsaretobesupportedonspreadingfootings.Asketchofaninteriorcolumnanditsspreadingfootingisgive
5、ninfigure2.Ifsuchaninteriorcarryinga50kdeadverticalload,a50kliveverticalload,andadeadloadmoment20ft-k.Trytodeterminethespreadingfootingofthiscolumn.Thedesigntaskshouldincludingfollowings,0-ft12-ft23-ft27-ftGWT5.5-ftHighPlasticClay(CH)SiltyClay(CL)Table1datafordifferentstrata (1)UnitconversionBeforeb
6、eginningyourdesign,pleaseconvertthedatainthefiguresandtablesfromEnglishtoSI,andpleaseuseSIinyourdesigning.(2)DesignloadcalculationTherearetwomethodsofexpressingandworkingwithdesignloads:theallowablestressdesign(ASD)andresistancefactordesign(LRFD).Calculatebothofthem.(3)GeotechnicaldesigningSelectasu
7、itabletypeofthespreadingfooting,determinethefootingdepth,determineallowablebearingpressure,anddeterminetherequiredbasedimensionsforthefootingsofthecolumninFigure2.Fig.2Asketchofthetypicalinteriorcolumnanditsfooting(4)StructuraldesigningDeterminethematerialsusinginthedesignedfootings,determinethethic
8、knessofthefooting,anddeterminethereinforcingsteelofthefooting.(5)SketchofthedesignedfootingShowyourdesigninasketch.AproposeddesignChapteroneUnitconversionTips:toconvenient,Englishunitswillbeusedinthedesigning.ChaptertwoDesignloadcalculationTheallowablestressdesign(ASD):5050100Pkkk=+=(min50Pk=max175P
9、k=)20Mftk=-(max50Mftk=-)Resistancefactordesign(LRFD):1.4501.750155uPkkk=?+?=1.42028uMftkftk=?-=-ChapterthreeGeotechnicaldesigningStep1-perTABLE8.1(5050100Pkkk=+=)UseanestimatedDof2ft(24in)Step2-Thegroundwatertableisat5.5ft,andisnotaconcernatthissiteStep3-perFigure6.11(SoilType:ClayDesignFwithTypical
10、Range)UseF=3.5step4-Forhighclay,ifsaturatedundrainedconditionsexist(assameastheproblemstatement),wemayconductastressanalysiswiththeshearstrengthdefinedasTucs=and0T=.Inthiscase,5.7,1.00.0cqrNNandN=(perTABLE6.1)Hence,1280cpsf=,105pcf=.Usingsquarefoundation(B=L).UsingtheBEARING.XLSspreadsheetwithmin50P
11、k=,thecomputedallowablebearingpressure,22770/aqlbft=Step5-perTABLE2.21/500a=(Typicalcommercialandresidentialbuildings)(1/500)(2021)0.48DaaSin=?=PerTABLE2.1forofficebuilding,use0.95ain=(inordertocontroldifferentialsettlementhere)Step6-usingTABLE7.5forclayeynaturalsoil,assumingthefoundationisarigidstr
12、ucture,thedesignvalueof/Dis0.5Step7-0.48(/)0.950.50.475DaaD=?=,sothetotalsettlementrequirementcontrolsthesettlementanalysisStep8-usingclassicalmethodtocomputetotalsettlementofshallowfoundation,whichisbasedonTerzaghistheoryofconsolidationBecauseoftheassumptionthatallofthesoilsareover-consolidated,theequationofthetotalsettlementcis:Case1(zfc