受冲切破坏四桩承台的压杆模型 (1)

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1、声日月'／●本人郑重声明：本论文是在导师的指导下，独立进行研究：工：作所取得的成果，撰写成博士／硕二l二学位论文兰矍泣翅破坯四焦丞鱼丝匿盘撞鲨。除论文中已经注明引用的内容外，对论文的研究做出重要贡献的个人和集体，均已在文中以明确方式标明。本论文中不包含任何未加明确注明的其他个人或集体已经公开发表或未公开发表的成果。本声明的法律责任由本人承担。学位论文作者签名：趟毽皤2∞4年7月6日ACKNOWLEDGEMENTS1wouldliketoacknowledgetheassistanceandcont

2、ributionsofmysupervisorProf．SuXiaozuforthegreatworkhehasdoneinmakingallthispossible．’I'heassistanceofljen’I]hin(USA)andKarl—HeinzReinneck(Germany)hasalsobeengreatlyacknowledgedwithgratitude．AcknowledgementalsogoestowardsmyChinesecolleagueswithgratitud

3、ewhohaveprovidedmewithahighlevelofcooperation1wouldalsoliketoacknowledgetheChineseScholarshipCouncilforthefinancialassistance．1wouldfinallyliketothankmyfamily(Uganda)andtheLiVingstones(Canada)forthemol’alandmotivationalbackup．OEDICATl0N：Dedicatedtowar

4、dstheengineeringcommunityfortheservicestheyprovideforvarioussocieties婢《bf-；氍iOb-￡isydEFO嚼≯；注蕊两氟征i黼讯㈣哥泛”Chapter1INTRODUCTION1．1DEsCRIPTIoNoFTHEPRoBLEMInthepastpilecapshavebeendesignedsimilartoreinforcedtwo-wayslabsaspervariousdesigncodes．Flexuraldeform

5、ationsinlightlyreinforcedtwo-wayslabsleadtotheirductility．Previousexperimentalobservationshaveactuallyshownthatpilecapsbehaveverydifferently．Theydeformverylittlepriortofailurehencekeepingtheloaddistributiontotherespectivepilesmoreorlessconstant．Asares

6、ult，pilecapsdonothavethenecessaryflexibilitytoinsureuniformityofpileloadsatfailure．Pilecapsalsodonotbehaveaswidebeams．Onlyaconcentratedzoneofconcreteabovethepilesresistssignificantload．Further,planesectionsdonotremainplaneinpilecapsnordoesitremainplan

7、einanyotherpunchingshearpronesectionssuchasthejointsbetweencolumnsandslabs．Strutaction，notbeamaction，isthepredominantmechanismofshearresistanceinpilecaps．Thusstrut—and—tiemodelsmoreaccuratelyrepresentthebehaviorofdeeppilecaps．Forexample，strut-and—tiem

8、odelscorrectlysuggestthattheloadatwhichalightlyreinforcedpilecapfailsintwo-waysheardependsonthequantityoflongitudinalreinforcement．Flexuraldesigncallbebestaccomplishedusingasimplestrut-and-tiemodelofwhichithasbeenprovedexperimentallythatthelon