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1、河北工业大学硕士学位论文桥梁承载力的数值分析与有粘结预应力加固姓名：刘永亮申请学位级别：硕士专业：岩土工程指导教师：徐东强20061101桥梁承载力的数值分析与有粘结预应力加固NUMERICALANALYSISONLOAD-BEARINGCAPACITYOFBRIDGESANDREINFORCEMENTOFPRESTRESSEDCONCRETEWITHBONDEDTENDONABSTRACTInthispaper,webeginwithaprojectofbridgeexaminationinTangshancity,inHebeiprovince.
2、Itisasimplebeamconcretebridgewithholes.Wewillgiveanevaluationofload-bearingcapacityofthisbridgeafteranexaminationandaFEManalysistothebridge.First,wegettheexaminationreportofthebridgeafteranexamination.Then,accordingtothedesignpapers,wesetthemodelofthebridgeinthecomputer(Andweca
3、nusetheexaminationdataoftherealbridgeorthetheoriesofthebridgedesign).Wesettingloadtothecontrolsections.Comparingtheresultscalculatedbythecomputerwiththereport,wegiveanevaluationofthecurrentload-bearingcapacityofthebridge.Then,accordingtothedesignpapersandthefact,welisttwokindso
4、fmethodofreinforcement.Attheend,accordingtothereinforcementplan,wesetthemodelofthebridgereinforced.First,wekilltheelementsofreinforcementandsetloadtothecontrolsections.Thenwekilltheelementsofconcretethestrainsofwhichisover0.002.Second,werelivetheelementsofreinforcementandsetloa
5、dtothecontrolsections.Attheend,wegiveanevaluationoftheload-bearingcapacityofthebridgereinforced.Aboveall,wemakeaconclusionthat:1.Afterthetestbyusingultrasonicreboundandwecalculatethatthecompressivestrengthofthebeamisf=18.34MPa.Itgoeswiththecodes.cd2.Comparetheresultsofdynamicte
6、stwiththevalueoftheoreticalcalculation.Thedynamicstiffnessisbeyondthedemandofthecodes.Thedisplacementandstrainofthebeamarealsobeyondthedemandofthecodes.3.Wechoosethereinforcementnamedprestressedconcretewithbondedtendonafteranalysis.4.Beingreinforcedbythemethodofprestressedconcr
7、etewithbondedtendon,theload-bearingofthebeamisimproved41.47%overtheoriginalbeam.KEYWORDS:load-bearingcapacity,prestressedconcretewithbondedtendon,finiteelementii河北工业大学硕士学位论文符号说明材料性能有关符号Δσ——在可变荷载频遇值弯矩M（对剪支t.1θ.fC30——表示立方体强度标准值为30MPa梁为）作用下，原梁受拉边缘的拉应力；的混凝土强度等级；Δσ——在可变荷载频遇值弯矩M作用下，f
8、，f——混凝土轴心抗压强度标准值、t.2θ.fckcd加固后截面受拉边缘的拉应力；设计值；ftk，ftd——
