基于分层滑移模型的斜拉索弯曲应力分析

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1、分类号密级U448删rr。J。l。J㈣J㈣㈣Y1530260⋯单位代码10618学号106320705墨废交通戈謦硕士学位论文论文题目：基于分层滑移模型的斜拉索弯曲应力分析BasedOnLayered-SlippingModelforBendingStressAnalysisofStayCables研究生姓名：谢宜导师姓名、职称：郑罡研究员申请学位门类工学专业名称：工程力学论文答辩日期：2009年4月6日学位授予单位：重庆交通大学答辩委员会主席：向中富评阅人：姚国文2009年4月郑万山ABSTRACTRecently,thebendingfatiguefailureofsta

2、ycableshasbeenpaidmoreattentionwordwidely．Aseriesofresearcheshavebeendone，whichshowsthebendingstressattheanchorportionistheprincipalfactorleadingtobendingfatiguefailureofthestaycables．However，theshortageofanalyticmethodsofbendingstressandthehigherrequirementforstaycablescausedbytheincreaseo

3、fspan，maketheresearchesonlocalbendingstressofstaycablesmoreandmoreimportant．Inthisthesis，basedonthetheoryoflayerslip，afiniteelementmodelhasbeenbuilt谢mANSYS．Theprocessofdelaminationhasbeensimulated，andthechangeofbendingstressbeenexpoundedalso．Themainobjectivesinthesisarethese：1．Theresearches

4、onbendingfatiguebehaviorofstaycableshavebeeninvestigateddeeply．Theachievementsoftestsandtheoriesinbendingfatiguefailureofstaycablesovertheworldaregeneralized，andthecharactersandboundsofflexiblecableidealtheory、uniformbendingstiffnesstheoryarecompared．2．Basedonthetheoryoflayerslip，theprogram

5、sonmodeloflayerslipofstaycablesusingthelanguageofAPDLwitllANSYSarecompiled．Thefiniteelementmodelofstaycablehasbeenbuilt、析thnonlinearbeamelement．Meanwhile．theconnectionandslipbetweeneachlayerhavebeensimulatedbychangingtheconditionsofcoupleonthecontrolnode．3．Thepropertiesofsimplifiedlayerslip

6、modelhavebeenanalyzed．Theprocessofdelaminationwithincreaseofraotationattheendofstaycables．thechangetrendofthemaximumbendingstress，andtheeffectsoflengthtomaximumbendingstressallhavebeenconcluded4．AnanalysisesofbendingstresshavebeenforpracticalStayCableBridgeprojest．BasedontheBridge，theproces

7、sofdelaminationhasbeensimulated，andthechangeofbendingstresshasbeenanalyzed．Thedifferencesbetweenthesolutionsattainedbylayerslipmodelandthetheoryofuniformbendingstiffhavebeendiscussed．Theresultsshowthat，itisnecessarytotaketheeffectoflayerslipintoaccount．A