抗弯刚度对主缆线形的影响

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1、22桥梁建设2011年第1期文章编号：1003～4722(2011)01—0022—04抗弯刚度对主缆线形的影响严琨，沈锐利，陈卫国。，唐茂林(1．西南交通大学桥梁系，四川成都610031；2．浙江省舟山连岛工程建设指挥部，浙江舟山316000)摘要：随着悬索桥跨径的不断增加，主缆截面也越来越大，主缆的抗弯刚度对主缆的线形将产生一定的影响，通过建立考虑抗弯刚度的主缆线形计算公式，提出主缆与鞍座切点的修正方法。建立不同边界条件和有、无鞍座的主缆有限元计算模型，分析抗弯刚度对主缆线形的影响。结果表明：抗弯刚度对主

2、缆的线形影响较大；抗弯刚度越大，主缆与鞍座的切点越靠近鞍座顶部；当跨中垂度不变时，随着抗弯刚度的增大，抗弯刚度对主缆线形影响的最大位置由鞍座处向跨中移动；当垂度变化时，随着主缆水平张力的增大，抗弯刚度对主缆线形影响的最大位置由跨中向鞍座处移动；考虑鞍座时会减小抗弯刚度对主缆线形的影响。关键词：悬索桥；主缆；抗弯刚度；线形；鞍座中图分类号：U448．25文献标志码：AInfluenceofBendingRigidityonGeometricShapeofMainCableYANKun，SHENRui—li，CH

3、ENWei—guo，TANGMao-lin(1．DepartmentofBridgeEngineering，SouthwestJiaotongUniversity，Chengdu610031，China；2．ZhejiangPro-vincialConstructionHeadquartersofZhoushanMainlandandIslandsLinkProject，Zhoushan316000，China)Abstract：Withtheconstantincreaseofspanlengthofsus

4、pensionbridge，thesectionofmaincableofthebridgebecomeslargerandlargerandthebendingrigidityofthemaincablewillexertcertaininfluenceonthegeometricshapeofthecable．Bywayofcreatingacalculationformulaforthegeometricshapeofthecable，takingintoconsiderationofthebendin

5、grigidity，themodifica—tionmethodfortangentpointbetweenthecableandcablesaddleisputforward，thefiniteele—mentcalculationmodelsfordifferentboundaryconditionsandforthecablewithandwithoutsad—dlesareestablishedandtheinfluenceofthebendingrigidityonthegeometricshape

6、isanalyzed．Theresultsoftheanalysisdemonstratethatthebendingrigidityhasgreatinfluenceonthegeo-metricshape，thegreaterthebendingrigidityis，thecloserthetangentpointofthecableandca—blesaddletOthetopofthesaddlewillbe．Atthetimethemidspansaggingremainsunchanged，wit

7、htheincreaseofthebendingrigidity，themaximumpositionoftheinfluenceofthebendingri—gidityonthegeometricshapewillmovefromthesaddletowardsthemidspanwhileatthetimethemidspansaggingchanges，withtheincreaseofthehorizontaltensioningofthecable，themaxi—mumpositionofthe

8、influenceofthebendingrigidityonthegeometricshapewillmovefromthemidspantowardsthesaddle．Theconsiderationofthesaddlecandecreasetheinfluenceofthebendingrigidityonthegeometricshape．Keywords：suspensionbridg