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1、橋梁建設(shè)2016年第46卷第1期(總第236期)30BridgeConstruction，Vo1．46，No．1，2016(TotallyNo．236)文章編號(hào)：1003—4722(2016)01—0030—05完全非平穩(wěn)地震作用下斜拉橋隨機(jī)響應(yīng)分析馬長飛，王波，汪正興，荊國強(qiáng)(1_中鐵大橋科學(xué)研究院有限公司，湖北武漢430034；2．橋梁結(jié)構(gòu)安全與健康國家重點(diǎn)實(shí)驗(yàn)室，湖北武漢430034)摘要：為研究粘滯液體阻尼器對(duì)斜拉橋隨機(jī)地震響應(yīng)的影響，結(jié)合虛擬激勵(lì)法和等效線性化法對(duì)某大型斜拉橋進(jìn)行完全非平穩(wěn)地震響應(yīng)分析。建立斜拉橋三維有限元模型，
2、功率譜輸入采用Conte和Peng提出的完全非平穩(wěn)功率譜模型，通過對(duì)粘滯阻尼等效線性化處理并采用虛擬激勵(lì)法將非平穩(wěn)隨機(jī)振動(dòng)求解問題轉(zhuǎn)化為一個(gè)確定性的逐步積分的過程，最后采用Monte—Carlo法驗(yàn)證虛擬激勵(lì)法計(jì)算結(jié)果的正確性。結(jié)果表明：虛擬激勵(lì)法可以準(zhǔn)確地計(jì)算此類完全非平穩(wěn)地震響應(yīng)；通過在斜拉橋適當(dāng)?shù)牟课辉O(shè)置粘滯液體阻尼裝置，顯著減小了斜拉橋的非平穩(wěn)隨機(jī)地震響應(yīng)，可以有效改善結(jié)構(gòu)的抗震性能。關(guān)鍵詞：斜拉橋；完全非平穩(wěn)；地震響應(yīng)；隨機(jī)振動(dòng)；虛擬激勵(lì)法；等效線性化法；粘滯液體阻尼器中圖分類號(hào)：U448．27；U441．3文獻(xiàn)標(biāo)志碼：AAna
3、lysisofRandomSeismicResponseofCableStayedBridgeUnderFullyNon—StationaryEarthquakeGroundMotionMAChang—fei～，WANGBo～，WANGZheng—xing～，JINGGuo-qiang’(1．ChinaRailwayBridgeScienceResearchInstitute，Ltd．，Wuhan430034，China；2．StateKeyLaboratoryofBridgeStructureHealthandSafety，Wuhan4
4、30034，China)Abstract：Toinvestigatetheinfluencesoftheviscousliquiddampersontherandomseismicre—sponseofcable-stayedbridge，therandomseismicresponseofamajorcable—stayedbridgeunderthefullynon—stationaryearthquakegroundmotionwasanalyzedbythepseudoexcitationmethodandequivalent1i
5、nearizationmethod．Thethree—dimensionalfiniteelementmodeIforthebridgewasestablishedandthepowerspectrumwasinputtothemodel，usingthefullynon～stationaryanalyti—calearthquakegroundmotionmodelproposedbyConteandPeng．Bywayoftheequivalentlinear—izationoftheviscousdampingandbythepse
6、udoexcitationmethod，thesolutionofthenon—sta—tionaryrandomvibrationissueofthebridgewastransformedtoadeterministicstep-by——stepinte—grationprocessandtheaccuracyofthecalculationcompletedbythepseudoexcitationmethodwasfinallyverifiedbytheMonte—Carlomethod．Theresultsdemonstrate
7、thattherandomseismicre—sponseofthecable—-stayedbridgeunderthefullynon—stationaryearthquakegroundmotioncanbecalculatedwithgoodaccuracybythepseudoexcitationmethod．Thearrangementoftheviscousliquiddampersontheappropriatepartsofthebridgecansignificantlydecreasetherandomseismic
8、responseandcaneffectivelyimprovetheseismicperformanceofthebridge．Keywords：cable—stayedbridge；ful
