南平樟湖库区大桥钢浮箱设计

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1、桥梁建设2014年第44卷第2期(总第225期)BridgeConstruction，Vo1．44，No．2，2014(TotallyNo．225)85文章编号：1003—4722(2014)02—0085—06南平樟湖库区大桥钢浮箱设计陈锐林，曹素功，唐世江，肖新强，唐璋(湘潭大学土木工程与力学学院，湖南湘潭411105)摘要：根据南平樟湖库区大桥建设条件，设计用于该桥深水桩基施工时拼装浮式平台的钢浮箱。根据设计要求及相关标准提出2种设计方案，即中底部龙骨、桁架、顶板横梁和侧板肋骨等均采用450mm肋距方钢方案和500mm肋距L形角钢方案。利用MIDASCivil软件建立2种方案的有限元模

2、型，计算4种工况下模型中梁单元、板单元的应力和位移变形并进行对比分析。结果表明：在4种工况下，2种设计方案的静力变形均较小，但2种方案的最大位移值和应力值相差较大；浮箱各构件的最大应力值远小于Q235B钢材的屈服强度值；L形角钢方案中构件的应力分布较方钢方案均匀。根据分析结果，该桥浮箱采用L形角钢方案，经现场测试和使用表明，浮箱具备良好的安全性和实用性，整体性能良好。关键词：桥梁工程，桩基础；钢浮箱；载重比；有限元法；方案；设计中图分类号：U445．34文献标志码：ADesignofSteelFloatingTanksforZhanghuReservoirAreaBridgeinNanpin

3、gCHENRui-lin，CAOSu—gong，TANGShi-jiang，XIAOXin—qiang，TANGZhang(SchoolofCivilEngineeringandMechanics，XiangtanUniversity，Xiangtan411105，China)Abstract：IncompliancewiththeconstructionconditionsoftheZhanghuReservoirAreaBridgeinNanping，thesteelfloatingtanksforassemblingofthefloatingworkingplatformforcons

4、tructionofthedeepwaterpilefoundationsofthebridgeweredesigned．Basedonthedesignrequirementsandtherelevanttechnicalstandards，2typesofthedesignschemesforthefloatingtankswereproposed，i．e．theschemeofthesquaresteelsof450mmribspacingandtheschemeoftheL—shapeanglesteelsof500mmribspacingweretoberespectivelyad

5、optedforthemiddleandbottomkeels，truss，topplatecrossbeamsandsideplateribsofafloatingtank．Thesoft—wareMIDASCivi1wasusedtoestablishthefiniteelementmodelsforthetwoschemesandthestressanddisplacementdeformationofthebeamelementsandplateelementsofthemodelsunderthe4loadcaseswerecomparedandanalyzed．Theresult

6、softhecalculationandanalysisindicatethatunderthe4loadcases，thestaticforcedeformationofthetwoschemesislittle，however，themaximumdisplacementandstressvaluesdiffergreatly．Themaximumstressvaluesoftheva—riouscomponentsofthefloatingtanksarefarlessthantheyieldstrengthoftheQ235Bsteelandthestressdistribution

7、ofthecomponentsoftheschemeoftheL—shapeanglesteelsismoreuni—formthanthatoftheschemeofthesquaresteels．Asaresult，itisdeterminedthattheschemeof收稿日期2O13—05—07基金项目教育部高等学校博士学科点专项科研基金(20104301120004)；教育部科学技术重点项目(2¨