悬索桥超高桥塔的刚度和风致响应.pdf

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1、桥梁建设2012年第42卷第4期(总第214期)14BridgeConstruction，Vo1．42，No．4，2012(TotallyNo．214)文章编号：1003—4722(2012)04—0014—07悬索桥超高桥塔的刚度和风致响应吴梦雪，李永乐，周昱，李翠娟(西南交通大学桥梁工程系，四川成都610031)摘要：为了探讨悬索桥超高桥塔的刚度和风致响应问题，围绕顺桥向A字形布置混凝土桥塔(不同底部张开量)和顺桥向独柱形布置混凝土桥塔(不同塔柱截面)展开研究。利用有限元分析软件建立了2种类型桥塔的裸塔自立状态有限元模型，计算对比了桥塔刚度以及静风响应，同时采用时域分析方法

2、计算桥塔的抖振响应，对比分析了在桥塔横向构造形式一定的前提下，不同类型方案对超高桥塔刚度和风致响应的影响。分析结果表明，顺桥向A字形桥塔的整体刚度较独柱形桥塔大；在顺桥向静风作用下，独柱形桥塔塔顶位移比A字形桥塔大得多；在顺桥向脉动风作用下，独柱形桥塔塔顶抖振位移响应的脉动程度远大于A字形桥塔。关键词：悬索桥；超高桥塔；刚度；风致响应；时域分析；有限元法中图分类号：U448．25文献标志码：AStiffnessandWind—InducedResponsesofVeryHighTowersofSuspensionBridgeWUMeng—xue，LIYong—le，ZHOUYu

3、，LJCui—juan(DepartmentofBridgeEngineering，SouthwestJiaotongUniversity，Chengdu610031，China)Abstract：Tostudythestiffnessandwind—inducedresponsesoftheveryhightowersofSUS—pensionbridge，theA—shapeconcretetower(withdifferentopeningdistancesbetweenfootingsofthetowercolumns)andtheisolatedcolumnconcr

4、etetower(withdifferentsectionsofthetowercolumns)arrangedinthelongitudinaldirectionofthebridgewereinvestigated．Theanalysissoft—warewasusedtoestablishthefiniteelementmodelforthetwotypesofthetowersinthestateoffreestandingandthestiffnessandstaticwindresponsesofthetowerswerecalculatedandcorn—pare

5、d．Meanwhile，thetime—domainanalysismethodwasusedaswel1tocalculatethebuffetingresponsesofthetowersandonconditionthatthetransversestructuralformsofthetowersweregiven，theeffectofthedifferenttypesofthetowersonthestiffnessandwind—inducedresponsesoftheveryhightowerswascomparedandanalyzed．Theresults

6、oftheanalysisdemonstratethattheglobalstiffnessoftheA—shapeconcretetowerarrangedinthelongitudinaldirectionofthebridgeisgreaterthanthatoftheisolatedcolumnconcretetowerandundertherespectiveactionofthestaticwindandfluctuatingwindinthelongitudinaldirectionofthebridge，thedisplacementatthetopofthei

7、solatedcolumnconcretetowerisfargreaterthanthatatthetopoftheA—shapeconcretetowerandthefluctuatingdegreeofthebuffetingdisplacementresponseatthetopoftheformerisalsofargreaterthanthatatthetopofthe1atter．收稿日期：20HO8—29基金项目：国家863计划资助项目(2008AA11Z101)；四川省杰出