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时间:2019-02-03
《多孔扰流板对半封闭窄箱梁涡振的减振效果》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、第26卷第3期实验流体力学Vol.26,No.32012年06月JournalofExperimentsinFluidMechanicsJun.,2012文章编号:1672-9897(2012)03-0050-06多孔扰流板对半封闭窄箱梁涡振的减振效果朱乐东1,2,3,张海1,3,张宏杰1,3(1.同济大学土木工程防灾国家重点实验室,上海200092;2.同济大学桥梁结构抗风技术交通行业重点实验室,上海200092
2、;3.同济大学桥梁工程系,上海200092)摘要:大跨度桥梁涡激共振是影响桥梁运营阶段行车舒适性和桥梁构件疲劳寿命的重要因素。以某半封闭钢箱梁斜拉桥为工程背景,通过节段模型风洞试验研究了在宽高比约为8.1的半封闭窄箱梁底板外缘安装多孔扰流板气动措施的涡振减振效果。结果表明:对于这类半封闭窄箱梁,在上游侧安装多孔板的减振效果略好于上下游两侧同时安装多孔板的减振效果,只在下游侧安装多孔板的减振效果要明显不如前二者;此外,多孔板悬挑宽度对其涡振减振效果也有较大影响,一般来说多孔板悬挑宽度越大,减振效果越好,尤其是对于只在
3、下游侧安装多孔板的情况,多孔板悬出宽度对减振效果的影响更明显。关键词:斜拉桥;半封闭窄箱梁;涡激共振;气动减振措施;多孔扰流板中图分类号:U446.1文献标识码:AMitigationeffectofmulti-orificeflow-disturbingplateonvortex-inducedresonanceofnarrowsemi-closedboxdeck1,2,3,ZHANGHai1,3,ZHANGHong-jie1,3ZHULe-dong(1.StateKeyLaboratoryforDisaster
4、ReductioninCivilEngineering,TongjiUniversity,Shang-hai200092,China;2.KeyLaboratoryforWindResistanceTechnologyofBridgeoftheMinis-tryofTransport,TongjiUniversity,Shanghai200092,China;3.DepartmentofBridgeEngi-neering,TongjiUniversity,Shanghai200092,China)Abstract
5、:Vortex-inducedresonanceoflong-spanbridgesisanimportantfactorreducingthecomfortofvehicledrivingandthelife-spanofbridgecomponentsduetofatigue.Takingacable-stayedbridgewithanarrowsemi-closedsteelboxdeckwithawidth-depthratioofabout8.1asanengineeringbackground,the
6、mitigationeffectofmulti-orificeflow-disturbingplates(MOFDP),juttinghorizontallyoutoftheouteredgesofthebottomplatesofthesemi-closeboxdeck,onthevortex-inducedresonanceofthecable-stayedbridgewasinvestigatedthroughase-riesofwindtunneltestsofsectionalmodel.Thetestr
7、esultsshowthatforsuchkindofnarrowsemi-closedsteelboxdeck,themitigationeffectofMOFDPmountedonlyatthewindwardedgeofthewindwardboxbottomplateissomewhatbetterthanthatoftheMOFDPsmountedsimulta-neouslyatboththewindwardedgeofthewindwardboxbottomplateandtheleewardedge
8、oftheleewardboxbottomplate.ThemitigationeffectofMOFDPmountedonlyattheleewardedgeoftheleewardboxbottomplateissignificantlyworsethantheformertwo.Moreover,theprotru-dinglengthoftheMOF
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