西南交通大学基础工程课程设计.doc

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1、FoundationDesign姓名学号马德林20100193班级2010级土木茅1班南交通大学土木工程学院2013年5月CONTENTSProblem2Design4ChapteroneUnitconversion4ChaptertwoDesignloadcalculation4ChapterthreeGeotechnicaldesigning4Step1toStep9Allowablebearingpressuremethod4Step10Checkingmomentload8ChapterfourStructuraldesigning8PartADeterminerequiredthic

2、knessbasedonatwo-wayshearanalysis—8Checkone-wayshear9PartBDesigntheflexuralsteel9ChapterfiveSketchofthedesignedfooting11Figure2Thicknessandeffectivedepth11Figure3Dimensionsandreinforcingsteel11Figure4Innerblockandouterblock12Figure5Structuralshow12Problem:DesignforPracticeAproposedofficebuildingisto

3、beconstructedatthesitewithageologicprofileshowedinfigure1.Thegroundtableisat5.5ft.Theshallowstrataareverysoft.Thedataforthesestratamaybeusedinfoundationdesignwereobtainedfromaseriesin-situtestsandlaboratorytests,andshowedintable1.Inthetable,Suisundrainedshearstrength;omispreconsolidationstress.GWT@5

4、.5-ftO-ftHighPlasticClay(CH)12-ftSiltyClay(CL)23-fti—11•11j.1•MediumSand(Dr=60%)27-ft；；；‘VeryStiffSiltyClay(CL)Fig.1geologicsectionfortheconstructionsiteThedesigncolumnsoftheproposedofficebuildingwillcarrythefollowingloads:deadverticalloadrange30-100k,liveverticalloadrange20-75k,anddeadloadmomentran

5、ge0-50ft・k.Thesecolumnsaretobesupportedonspreadingfootings.Asketchofaninteriorcolumnanditsspreadingfootingisgiveninfigure2.Ifsuchaninteriorcarryinga50kdeadverticalload,a50kliveverticalload,andadeadloadmoment20ft-k.Trytodeterminethespreadingfootingofthiscolumn.Thedesigntaskshouldincludingfollowings,T

6、able1datafordifferentstrataDepthRange(ft)SoilDescriptionTiotal(pcf)Su(psf)Cc/(1+6o)Cr/(1+e0)a*m(psf)0-12CH10512800.150.02260012-23CL11218000.110.015300023-27Med.Sand120-0.0060.002->27CL11826000.080.016000(1)UnitconversionBeforebeginningyourdesign,pleaseconvertthedatainthefiguresandtablesfromEnglisht

7、oSI,andpleaseuseSIinyourdesigning.(2)DesignloadcalculationTherearetwomethodsofexpressingandworkingwithdesignloads:theallowablestressdesign(ASD)andresistancefactordesign(LRFD).Calculatebothofthem.(3)Ge