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1、橋梁建設ZOl5年第45卷第2期(總第231期)BridgeConstruction。Vo1.45,No.2,2015(TotallyNo.231)77文章編號:1003—4722(2015)02—0077—06大跨度橋梁抗風設計常用氣動措施分析胡長燦,詹昊(1.中鐵大橋勘測設計院集團有限公司,湖北武漢430056;2.西南交通大學,四川I成都610031)摘要:為提高大跨度橋梁的抗風性能,對該類橋梁抑制渦激共振和提高顫振穩(wěn)定性的常用氣動措施及其機理進行初步分析。橋梁渦激共振和顫振穩(wěn)定性與旋渦的產(chǎn)生和漂移有關,因此氣動優(yōu)化的
2、一般原則是改善結構迎風面和背風面的氣動外形以延緩或避免流動分離、減小分離渦尺度、阻礙旋渦漂移路徑。抑制橋梁渦激振動一般采用設置倒角、安裝風嘴和優(yōu)化風嘴形狀、安裝導流板等氣動措施;提高橋梁顫振穩(wěn)定性一般采用安裝風嘴和優(yōu)化風嘴形狀、安裝穩(wěn)定板和氣動翼板等氣動措施。研究表明采用氣動措施后,大跨度橋梁的氣動性能得到改善。關鍵詞:大跨度橋梁;渦激共振;顫振;倒角;風嘴;導流板;抗風設計;氣動措施中圖分類號:U442.5;U443文獻標志碼:AAnalysisofCommonAerodynamicMeasuresforWindResis
3、tantDesignofLongSpanBridgesHUChang—carl.ZHANHao’。(1.ChinaRailwayMajorBridgeReconnaissance&DesignGroupCo.,Ltd.,Wuhan430056,China;2.SouthwestJiaotongUniversity,Chengdu610031,China)Abstract:Toimprovethewindresistantperformanceoflongspanbridges,thecommonaero—dynamicmea
4、suresandtheirmechanismforsuppressingthevortex——inducedresonanceandforim——provingtheflutterstabilityofthebridgesarepreliminarilyanalyzed.Sincethevortex-inducedres—onanceandflutterstabilityofthebridgesarecorrelatedwiththevortexgenerationandvortexdrift,thegeneralprinc
5、ipleofoptimizingtheaerodynamicmeasuresistoimprovethewindwardandleewardstructuralaerodynamicprofilesinordertodelayoravoidtheflowseparation,reducetheseparatedvortexscalesandimpedethevortexdriftpaths.Asregardstheaerodynamicmeasuresforsuppressingthevortex-inducedvibrat
6、ionofthebridges,theroundedcornersandwindfairingsaregenerallyinstalled,theshapesofthewindfairingsareoptimizedandtheguidevanesarein—stalledwhileasregardsthemeasuresforimprovingtheflutterstability,thewindfairingsaregen—erallyinstalled,theshapesofthewindfairingsareopti
7、mizedandthestabilizersandaerodynamicwingplatesareinstalled.Researchesindicatethattheaerodynamicperformanceofthelongspanbridgescanbeimprovedafterthesemeasureshavebeentaken.Keywords:longspanbridge;vortex-inducedresonance;flutter;roundedcorner;windfair—ing;guidevane;w
8、ind—resistantdesign;aerodynamicmeasure1前言的結構體系和主梁斷面以提高橋梁的整體剛度,在現(xiàn)代橋梁向大跨度發(fā)展,其抗風性能越來越受此基礎上選擇恰當?shù)臍鈩哟胧┮蕴岣呓Y構整體的氣到人們的關注。通常采用結構措施、氣動措施和機動性能。氣動優(yōu)化的原則是改善結構迎風