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《基于實(shí)測(cè)風(fēng)譜的潤(rùn)揚(yáng)懸索橋橋址區(qū)三維脈動(dòng)風(fēng)場(chǎng)模擬》由會(huì)員上傳分享,免費(fèi)在線(xiàn)閱讀,更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫(kù)。
1、第39卷第6期東南大學(xué)學(xué)報(bào)(自然科學(xué)皈)VO1.39NO.62009年11月JOURNALOFSOUTHEASTUNIVERSITY(Natura1ScienceEdition)NOV.2009doi:10.3969/j.issn.1001—0505.2009.06.023基于實(shí)測(cè)風(fēng)譜的潤(rùn)揚(yáng)懸索橋橋址區(qū)三維脈動(dòng)風(fēng)場(chǎng)模擬王浩李?lèi)?ài)群謝以順李杏平(東南大學(xué)混凝土及預(yù)應(yīng)力混凝土結(jié)構(gòu)教育部重點(diǎn)實(shí)驗(yàn)室,南京210096)摘要:針對(duì)大跨度懸索橋的結(jié)構(gòu)形式和振動(dòng)模態(tài)特點(diǎn),結(jié)合自然風(fēng)的相關(guān)特性,給出了一種簡(jiǎn)化的三維脈動(dòng)風(fēng)場(chǎng)模擬方法
2、,將實(shí)際面狀的三維脈動(dòng)風(fēng)場(chǎng)簡(jiǎn)化為多個(gè)線(xiàn)狀的一維脈動(dòng)風(fēng)場(chǎng).基于諧波合成法,并運(yùn)用FFT技術(shù),進(jìn)行了潤(rùn)揚(yáng)懸索橋橋址區(qū)三維脈動(dòng)風(fēng)場(chǎng)的模擬.為了真實(shí)反映橋址區(qū)強(qiáng)風(fēng)特性,模擬目標(biāo)功率譜采用由該橋結(jié)構(gòu)健康監(jiān)測(cè)系統(tǒng)實(shí)測(cè)臺(tái)風(fēng)數(shù)據(jù)運(yùn)用非線(xiàn)性最小二乘法擬合而得的擬合譜.結(jié)果表明,該風(fēng)場(chǎng)模擬方法計(jì)算效率較高,主梁與主塔結(jié)構(gòu)脈動(dòng)風(fēng)場(chǎng)的模擬值均與目標(biāo)值吻合較好,驗(yàn)證了該風(fēng)譜模擬方法的有效性和可靠性.關(guān)鍵詞:懸索橋;結(jié)構(gòu)健康監(jiān)測(cè)系統(tǒng);紊流功率譜;風(fēng)場(chǎng);數(shù)值模擬;諧波合成法中圖分類(lèi)號(hào):U448;V321文獻(xiàn)標(biāo)志碼:A文章編號(hào):1001—050
3、5(2009)06—1206-06Digitalsimulationof3-dimensionalturbulencewindfieldofRunyangSuspensionBridgebasedonmeasuredwindspectraWangHaoLiAiqunXieYishunLiXingping(KeyLaboratoryofConcreteandPrestressedConcreteStructuresofMinistryofEducation,SoutheastUniversity,Nanjing21
4、096,China)Abstract:AccordingtothestructuralstylesandthevibrationmodecharacteristicsoflongspanSUS—pensionbridges.a(chǎn)ndconsideringthecorrelationofnaturalwind.a(chǎn)digitalsimulationmethodforsim—plified3一dimensionalturbulencewindfieldispresented.whichturnsthe3.dimensio
5、nalwindfieldonaplaneintothe1一dimensionalturbulencewindfieldonmulti—lines.Combinedwiththespectralrep—resentationmethodandthefastFouriertransforlTl(FFT)technique.thedigitalsimulationof3一dimen—sionalturbulencewindfieldforRunyangSuspensionBridge(RSB)wascariedout.
6、Inordertore—flectthestrongwindcharacteristicsofRSBmoreactually.theexperimentalturbulencepowerspectrumachievedbynonlinearlest.squaresfittingontheexperimentaltyphoondatafromstructuralhealthmonitoringsystem(SHMS)wasusedasobiectpowerspectruminthesimulation.Result
7、sshowthatthedigitalsimulationmethOdof3.dimensionalturbulencewindfieldhashighcalculationeficiencyandthesimulationvalueswellfitwiththeobjectvalues.whichprovestheeflficiencyandreliabilityofthewindfieldsimulationmethod.Keywords:suspensionbridge;structuralhealthmo
8、nitoringsystem(SHMS);turbulencepowerspectrum;windfield;digitalsimulation:spectralrepresentationmethod由于跨度及橋?qū)挼牟粩嘣黾?,使得大跨度橋梁濾波法計(jì)算速度快,但模擬參數(shù)難以確定.諧波合風(fēng)致抖振問(wèn)題變得日益突出.在橋梁抖振響應(yīng)時(shí)域成法算法簡(jiǎn)單,理論完善,其樣本的高斯特性、均