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ID:36496104
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时间:2019-05-11
《吊杆更换对九堡大桥主桥受力性能的影响分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、吊杆更换对九堡大桥主桥受力性能的影响分析苏庆田,杨国涛,吴冲文章编号:1003-4722(2011)04—0015-05吊杆更换对九堡大桥主桥受力性能的影响分析苏庆田,杨国涛,吴冲(同济大学桥梁工程系,上海200092)摘要:为研究吊杆更换对九堡大桥主桥受力性能的影响,根据该桥结构特点提出12种吊杆更换预案并进行分析。采用ANSYS建立该桥空间有限元模型,分析在不同吊杆更换方案下主桥结构的应力和位移、对拱肋和主梁及对吊杆力的影响。分析结果表明:在正常运营情况下,一跨内吊杆局部更换的数量小于3根时,只对更换吊杆跨的结构内力产生影响;一跨内吊杆局部更换
2、时,对该跨拱肋、主梁及吊杆力的影响随拆除吊杆数量的增加而加大,当结构局部连续拆除的吊杆数量小于3根时,结构受力是安全的,但当局部连续拆除的吊杆数量达到3根时,拱肋下缘的应力超过了规范规定的材料强度容许值。关键词:系杆拱桥;吊杆;更换;结构响应;分析;有限元法中图分类号:U443.38文献标志码:AAnalysisofEffectofSuspenderReplacementonMechanicalBehaviorofMainBridgeofJiubaoBridgeSUQing—tian,YANGGuo-tao,WUChong(Departmentof
3、BridgeEngineering,TongjiUniversity,Shanghai200092。China)Abstract:TostudytheeffectofsuspenderreplacementonthemechanicalbehaviorofthemainbridgeoftheJiubaoBridge,twelveproposalsforthesuspenderreplacementwereputfor—wardandanalyzedinaccordancewiththestructuralcharacteristicsofthebr
4、idge.TheANSYSwasusedtosetupthespatialfiniteelementmodelofthebridge,thestructuralstressanddis—placementofthebridgeunderthedifferentproposalsandtheeffectoftheproposalsonthearchribs,maingirderandsuspenderforceswereanalyzed.Theresultsoftheanalysisdemonstratethatonconditionofnormal
5、operationofthebridgeandinthecasethatlessthan3nos.oftheSUS—pendersarelocallyreplacedwithintherangeofonespan,thesuspenderreplacementwillonlyhaseffectonthestructuralinternalforceofthespanwiththesuspendersreplaced.Forthespanwiththesuspenderslocallyreplaced,theeffectonthearchribs,m
6、aingirderandsuspenderforceswillincreasewiththeincreaseoftheremovalnumbersofthesuspenders.Inthecasethatthecontinu—OUSremovalnumbersofthesuspendersinthe1ocalpartofthestructureiSlessthan3.theme—chanica1behaviorofthestructureiSsafe,however,inthecasethatthecontinuousremovalnum—bers
7、ofthesuspendersinthe1oealpartis3。thestressinlowerflangesofthearchribswillexceedtheallowablevaluesofmaterialstrengthasspecifiedinthecodes.Keywords:tiedarchbridge;suspender;replacement;structuralresponse;analysis;finiteelPmentmeth0d收稿日期:2010—09—01作者筒介:苏庆田(1974一),男,副教授,1997年毕业于昆明
8、理工大学建筑工程专业,工学学士,2000年毕业于昆明理工大学结构工程专业,工学硕士,2003年毕业于同济大学结构工程专业,
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