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1、橋梁建設(shè)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(hào)：1003—4722(2015)02—0077—06大跨度橋梁抗風(fēng)設(shè)計(jì)常用氣動(dòng)措施分析胡長(zhǎng)燦，詹昊(1．中鐵大橋勘測(cè)設(shè)計(jì)院集團(tuán)有限公司，湖北武漢430056；2．西南交通大學(xué)，四川I成都610031)摘要：為提高大跨度橋梁的抗風(fēng)性能，對(duì)該類橋梁抑制渦激共振和提高顫振穩(wěn)定性的常用氣動(dòng)措施及其機(jī)理進(jìn)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(guān)，因此氣動(dòng)優(yōu)化的一般原
2、則是改善結(jié)構(gòu)迎風(fēng)面和背風(fēng)面的氣動(dòng)外形以延緩或避免流動(dòng)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(dòng)一般采用設(shè)置倒角、安裝風(fēng)嘴和優(yōu)化風(fēng)嘴形狀、安裝導(dǎo)流板等氣動(dòng)措施；提高橋梁顫振穩(wěn)定性一般采用安裝風(fēng)嘴和優(yōu)化風(fēng)嘴形狀、安裝穩(wěn)定板和氣動(dòng)翼板等氣動(dòng)措施。研究表明采用氣動(dòng)措施后，大跨度橋梁的氣動(dòng)性能得到改善。關(guān)鍵詞：大跨度橋梁；渦激共振；顫振；倒角；風(fēng)嘴；導(dǎo)流板；抗風(fēng)設(shè)計(jì)；氣動(dòng)措施中圖分類號(hào)：U442．5；U443文獻(xiàn)標(biāo)志碼：AAnalysisofCommonAerodynamicMeasuresforWindResistantDe
3、signofLongSpanBridgesHUChang—carl．ZHANHao’。(1．ChinaRailwayMajorBridgeReconnaissance&DesignGroupCo．，Ltd．，Wuhan430056，China；2．SouthwestJiaotongUniversity，Chengdu610031，China)Abstract：Toimprovethewindresistantperformanceoflongspanbridges，thecommonaero—dynamicmeasuresandt
4、heirmechanismforsuppressingthevortex——inducedresonanceandforim——provingtheflutterstabilityofthebridgesarepreliminarilyanalyzed．Sincethevortex-inducedres—onanceandflutterstabilityofthebridgesarecorrelatedwiththevortexgenerationandvortexdrift，thegeneralprincipleofoptimi
5、zingtheaerodynamicmeasuresistoimprovethewindwardandleewardstructuralaerodynamicprofilesinordertodelayoravoidtheflowseparation，reducetheseparatedvortexscalesandimpedethevortexdriftpaths．Asregardstheaerodynamicmeasuresforsuppressingthevortex-inducedvibrationofthebridges
6、，theroundedcornersandwindfairingsaregenerallyinstalled，theshapesofthewindfairingsareoptimizedandtheguidevanesarein—stalledwhileasregardsthemeasuresforimprovingtheflutterstability，thewindfairingsaregen—erallyinstalled，theshapesofthewindfairingsareoptimizedandthestabili
7、zersandaerodynamicwingplatesareinstalled．Researchesindicatethattheaerodynamicperformanceofthelongspanbridgescanbeimprovedafterthesemeasureshavebeentaken．Keywords：longspanbridge；vortex-inducedresonance；flutter；roundedcorner；windfair—ing；guidevane；wind—resistantdesign；a
8、erodynamicmeasure1前言的結(jié)構(gòu)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(fēng)性能越來(lái)越受此基礎(chǔ)上選擇恰當(dāng)?shù)臍鈩?dòng)措施以提高結(jié)構(gòu)整體的氣到人們的關(guān)注。通常采用結(jié)構(gòu)措施、氣動(dòng)措施和機(jī)動(dòng)性能。氣動(dòng)優(yōu)化的原則是改善結(jié)構(gòu)迎風(fēng)
