《基础工程英文复习》ppt课件

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1、第一章07:48:451基础工程基础工程研究下部结构物与岩土相互作用共同承担上部结构物所产生各种强度、变形与稳定问题。桩、墩基、箱基、支挡结构、围护结构、水泥搅拌体，砂石桩体，锚固，土钉、砂井等等，都可视为结构物与岩土相互作用问题。FactorsofSafetyDependsonRequiredreliabilityConsequencesofafailureUncertaintiesinsoilpropertiesandappliedloadsConstructiontolerancesIgnoranceofthetruebehavioroffoun

2、dationsCost-benefitratioofadditionalconservatisminthedesign.第二章07:48:4540.75[]a0.75[]aAllowablestressdesign(useinthisbook)Thedesignloadisthemostcriticalcombinationofthevariousloadsources,asdefinedbycodes.ANSI/ASCE，D(2.1)D+L+F+H+T+(LrorSorR)(2.2)D+L+(LrorSorR)+(WorE)(2.3)D+(WorE)

3、(2.4)07:48:455（1）由可变荷载控制时：组合值系数c07:48:456（2）由永久荷载控制时：组合值系数c07:48:457（四）计算挡土墙、地基或斜坡稳定基滑坡推力时，荷载效应，按承载能力极限状态下荷载效应的基本组合，但其分项系数均为1：组合值系数c07:48:458ServiceabilityrequirementsIntendedtoproducefoundationsthatperformwellwhensubjectedtotheserviceloads.TheRequirementsinclude:SettlementHe

4、ave抬升TiltLateralmovementVibrationDurability07:48:459MeasuresforalargesettlementAdjustthefoundationdesignUseamoreelaboratefoundationImprovethepropertiesofthesoilRedesignthestructuresoitismoretolerantofsettlements07:48:4510DifferentialsettlementsDefinitionThedifferentialsettlement

5、isthedifferenceintotalsettlementbetweentwofoundationorbetweentwopointsonasinglefoundation.ReasonsforDifferentialsettlements:ThesoilprofilemaynotbeuniformacrossthesiteTheratiobetweentheactualloadandthedesignloadmaybedifferentforeachcolumn.Theratioofdeadloadtoliveloadmaybedifferen

6、tforeachcolumn.Theas-builtfoundationdimensionsmaydifferfromtheplandimensions.07:48:4511第五章07:48:4512Whatisshallowfoundations?d/b<=2.5ShallowfoundationsThosetransmitstructuralloadstothenear-surfacesoil.Types:Spreadfootingfoundations(扩展基础)Matfoundations（筏板基础）07:4813dbdbFoundations

7、witheccentricormomentloadsOne-wayloading(a)eB/6Two-wayeccentricormomentloadingsummary1.Shallowfoundationsarethosethattransmitstructuralloadstothenear-surfacesoils.Therearetwokinds:spreadfootingfoundationsandmatfoundations.2.Althoughothermaterialshavebeenusedinth

8、epast,todayvirtuallyallshallowfoundationsaremad