斜拉桥索塔分离式斜置钢锚箱受力分析

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1、桥梁建设2016年第46卷第1期(总第236期)88BridgeConstruction，Vo1．46，No．1，2016(TotallyNo．236)文章编号：1003—4722(2016)01—0088—06斜拉桥索塔分离式斜置钢锚箱受力分析李福鼎(上海市政工程设计研究总院(集团)有限公司，上海200092)摘要：为研究斜拉桥索塔分离式斜置钢锚箱的特性，对其结构特点及索塔锚固区受力进行分析。由于钢锚箱分离斜置，横桥向水平分力无法自平衡，塔柱相对于钢锚箱刚度增大，塔柱同时承担全部横桥向水平力和较多顺

2、桥向水平力。以某独塔斜拉桥菱形桥塔为例，采用ANSYS建立索塔钢锚箱空间模型，分析钢锚箱斜置对钢锚箱和塔壁应力分布的影响及斜拉索水平力在两者间的分配比例。结果表明：相对于整体式钢锚箱，分离式斜置钢锚箱斜拉索水平力分配比例降低，混凝土塔柱承担了较多水平分力，钢锚箱各板件和剪力钉受力不对称，应力水平较低且分布不均。关键词：钢锚箱；斜拉桥；菱形桥塔；索塔锚固区；结构特点；受力分析；有限元法中图分类号：U443．38；U448．27文献标志码：AForceConditionAnalysisofSeparate

3、dandObliquelySetSteelAnchorBoxesinPylonofCable-StayedBridgeLIFu-ding(ShanghaiMunicipalEngineeringDesignInstitute(Group)Co．，Ltd．，Shanghai200092，China)Abstract：Tostudythecharacteristicsoftheseparatedandobliquelysetsteelanchorboxesinpylonofcable—stayedbrid

4、ge。thestructuralcharacteristicsoftheanchorboxesandtheforcecondi—tionsoftheanchorageZoneinthepylonwereanalyzed．Becausetheanchorboxeswereseparatedandobliquelyset，thetransversehorizontalcomponentforcecouldnotbeself—balancedandincorn—parisontotherigidityoft

5、heanchorboxes，therigidityoftheconcretepyloncolumnsincreasedandatthesametime，thepyloncolumns．borethewholeofthetransversehorizontalforceandmuchofthelongitudinalhorizontalforce．Bywayofexampleofthediamond—shapepylonofasingle—pyloncable—stayedbridge，thesoftw

6、areANSYSwasusedtoestablishthespatialfiniteelementroodelfortheanchorboxesinthepylon，theinfluencesoftheobliquelysettingoftheanchorboxesonthestressdistributionoftheanchorboxesandpylonwallsaswel1astheratiosofthehorizontalforcedistributionofthestaycablesbetw

7、eentheanchorboxesandpylonwallswereanalyzed．There-suitsoftheanalysisshowthatascomparedtotheintegralstee1anchorbox，theratiosofthehori—zontalforcedistributionofthestaycablesoftheseparatedandobliquelysetsteejanchorboxesde—creaseandthepyloncolumnsbearmuchoft

8、hehorizontalcomponentforce．Theforceconditionsofthecomponentsandshearstudsoftheanchorboxesarenotsymmetric，thestress1evelsare1OWandarenotuniform．Keywords：steelanchorbox；cable—stayedbridge；diamond—shapepylon；anchoragezoneinpylon；str