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ID:32688764
大小:1015.00 KB
页数:7页
时间:2019-02-14
《分析斜向风作用下倒梯形桁梁桥气动力参数研究》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、学兔兔www.xuetutu.com桥梁建设2015年第45卷第4期(总第233期)BridgeConstruction,Vo1.45,No.4,2015(TotallyNo.233)19文章编号:1003—4722(2015)04—0019—07斜向风作用下倒梯形桁梁桥气动力参数研究郑史雄,张龙奇,张向旭,张俊明(西南交通大学土木工程学院,四川成都610031)摘要:为研究气动力参数对倒梯形断面公铁两用桁梁桥在斜向风作用下气动特性的影响,采用2种不同断面尺寸的倒梯形断面桁梁模型,针对成桥状态与施工
2、状态,在大范围风偏角(0。~180。)与不同风攻角来流条件多种组合工况下进行风洞试验,测量其五分力系数,并将试验值与传统斜向风分解理论结果进行对比。试验结果表明:横桥向力系数最大值均发生在风偏角为15。左右时,顺桥向力系数最大值发生在风偏角为6O。左右时;对于此类断面桁梁桥,横桥向风致响应计算时,横桥向来风时不一定是最不利来流,且顺桥向力不能忽略。对比风洞试验结果与斜向风分解理论表明,两者得出的顺桥向力系数与横桥向力系数的比值有一定的偏差。关键词:桁梁桥;倒梯形断面;斜向风;气动力参数;风偏角;风攻
3、角;风洞试验中图分类号:U448.211;U442.59文献标志码:AStudyofAerodynamicParametersofTrussGirderBridgewithInvertedTrapezoidSectionUnderSkewWindZHENGShi-xiong,ZHANGLong—qi,ZHANGXiang—In,ZHANGJun—ming(SchoolofCivilEngineering,SouthwestJiaotongUniversity,Chengdu610031,China)
4、Abstract:Tostudytheinfluencesoftheaerodynamicparametersontheaerodynamiccharac—teristicsoftherail—cum—roadtrussgirderbridgewithinvertedtrapezoidsectionunderskewwind,twokindsofthetrussgirdermodelswithinvertedtrapezoidsectionsofdifferentdimensionsweresele
5、ctedandthewindtunne1testsforthemodelswerecarriedoutunderthevariouscombinedcasesofthecompletedbridgeandconstructionstate,widerangeofwindyawedangles(0。~180。)anddifferentwindattackangleflow.Thefive—componentforcecoefficientsofthemodelsweremeas—uredandthet
6、estvalueswerecomparedtotheresultsofthetraditionaIskewwinddecompositiontheory.Theresultsofthetestsshowthatthemaximumvaluesoftheforcecoefficientsofthetransversebridgedirectionallappearatthewindyawedangleofabout15。whilethemaximumval—uesoftheforcecoefficie
7、ntsofthelongitudinalbridgedirectionappearattheyawedangleofabout60。.Forthetrussgirderbridgewithsuchtypeofthetrapezoidsection,thewindfromthetrans-versebridgedirectionisnotnecessarilytheworstflowinthecalculationofthetransversebridgewind—inducedresponseand
8、thewindforceofthelongitudinalbridgedirectioncannotbeignored.Thecomparisonofthewindtunneltestresultstotheskewwinddecompositiontheorytellsthattheratiosoftheforcecoefficientsofthetransverseand1ongitudinalbridgedirectionsobtainedbythetestsa
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