预应力混凝土箱梁桥腹板受力分析及预应力损失研究

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1、武汉理工大学硕士学位论文预应力混凝土箱梁桥腹板受力分析及预应力损失研究姓名：苏杭申请学位级别：硕士专业：公路桥梁与渡河工程指导教师：张谢东20071101武汉理工大学硕士学位论文AbstractTheprestressedconcretebox-beambridgeiswidelyusedwithitsspecialadvantagesofthegoodcomprehensiveperformance，highstructurestiffness，littledeformationandgoodearthquakeresistantperformance。Atpresent,the

2、triaxialprestressingstructureisusedforprestressedconcretecontinuousbox-beambridgeinmostcases，whichleadstoloadedforceofbox-beamwebmorecomplicated．Iftheprincipaltensionstressofbox·beamwebiscontrolledimproperly,theprincipaltensionstresswillexceedallowablevalueandcausetheinclinedcrackoftheweb，Thei

3、nclinedcrackofwebiSthemaincauseofmiddleanddowndeflectionofbox-beambridgespan．Ifthereismorecracks，therigidnessbecomeslessandthemiddleanddowndeflectionofspanismoreserious；andifthemiddleanddowndeflectionofspanbecomesmore，thecrackdegreeismoreserious．Moreover,theinclinedcracksaffecttheappearance，be

4、aringcapacity,servicelifeandtrafficsafetytoalargeextent．Thecauseofprestresslossisanalyzedandinvestigatedduringalongtime．Theprestresslossdirectlyinfluencesthecrackresistingpropertyandthedeflectionofthesla-BctRre，especiallytheverticalprestresslossCalldirectlyinfluencetheappearanceofinclinedcrack

5、softheweb．Therefore，thecalculationanalysisofprincipaltensionstressofbox-beamwebandtheinvestigationofprestresslosshasanimportantengineeringmeaning．Thispapermakescomprehensiveanalysisonprestressloss．"especiallyforverticalprestresslossintheory．Thetheoreticalcalculationformulaofprincipaltensionstr

6、essofthewebisdiscussedandthespecificengineeringexamplesareusedforthetheoreticalcalculationandanalysisofprincipaltensionstressofbox·beamweb．BasedonthesouthbankbridgeofHubeiSuiyuezhongHanjiangGrandBridge,theMIDAS／Civilfmiteelementsoftwareisusedfordetailedstresscalculationofbox-beamwebineachconst

7、ructionstageandoperationstageofthesouthbankbridgeandinvestigationofstresschangingprincipalineachworkingconditiontogettheusefulconclusion．Thispaperalsoanalyzestheunfavorableinfluenceonloadedforceofwebfromconsortion,ereepageandprestressas