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1、橋梁建設(shè)2015年第45卷第4期(總第233期)100BridgeConstruction,Vo1.45,No.4,2015(TotallyNo.233)文章編號:1003—4722(2015)04—0100~07正交異性板橋面體系多尺度動(dòng)態(tài)邊界逼近方法田園,張楠,夏禾(北京交通大學(xué)土木建筑工程學(xué)院,北京100044)摘要:針對采用傳統(tǒng)方法求解大跨度鐵路鋼橋中正交異性板橋面體系的動(dòng)力效應(yīng)的缺陷,提出一種基于動(dòng)力平衡方程和有限元思想的多尺度動(dòng)態(tài)邊界逼近分析方法。首先在較大尺度上建立整體節(jié)段模型,驗(yàn)證模型正確性并完成動(dòng)力計(jì)算。然后在整體模型的基
2、礎(chǔ)上對所關(guān)心的局部區(qū)域進(jìn)行精細(xì)化處理。根據(jù)有限元對應(yīng)關(guān)系,利用前一步計(jì)算所得整體模型的響應(yīng)作為細(xì)化模型的邊界條件,最終得到小尺度模型的動(dòng)力響應(yīng)。以某公鐵兩用斜拉橋鐵路正交異性板鋼橋面體系為例,通過與ANSYS計(jì)算結(jié)果進(jìn)行對比驗(yàn)證了該方法的正確性及其精度,該方法既能夠在較大尺度上完成整體分析,又能從細(xì)微角度逐步細(xì)化獲取局部細(xì)節(jié)信息,具有很好的應(yīng)用前景。關(guān)鍵詞:鐵路橋;正交異性板橋面體系;多尺度建模;動(dòng)態(tài)邊界逼近;動(dòng)力效應(yīng);有限元法中圖分類號:U448.13;U443.32文獻(xiàn)標(biāo)志碼:AMulti—ScaleDynamicBoundaryApp
3、roximationMethodforOrthotropicPlateBridgeDeckingTIANYuan,ZHANGNnn,X1.4He(SchoolofCivilEngineering,BeijingJiaotongUniversity,Beijing100044,China)Abstract:Inviewofthedeficiency0{solvingthedynamiceffectoftheorthotropicplatebridgedeckingoflongspanrailwaysteelbridge,usingthecon
4、ventionalmethod,akindofthemulti—scaledynamicboundaryapproximationmethodbasedonthedynamicbalanceequationandfiniteelementideawasproposed.Theglobalsectionalmodelofthebridgedeckingwasfirstlyestablishedona1argescale.thecorrectnessofthemode1wasverifiedandthedynamiccalculationoft
5、hemode1wasmade.Onthebasisoftheglobalsectiona1mode1,the1ocalareasofconcernwererefinedandac—cordingtothecorrespondingrelationsofthefiniteelements,theresponsesofthemodelobtainedfromthepreviousstepcalculationwerethentakenastheboundaryconditionsoftherefinedmode1andthedynamicres
6、ponsesofthesmall—scalemodelwerefinallyobtained.Bywayofexampleoftherailwayorthotropicplatesteeldeckingofarail—cure—roadcable—stayedbridge,thecorrectnessandaccuracyoftheproposedmethodwereverifiedbycomparisonofthemethodtothecalculationresultsoftheANSYS.Themethodnotonlycanfulf
7、illtheglobalanalysisofthelarge-scalemodel,butalsocanobtainthelocaldetailinformationthroughgraduallydetailingfromtheminordetailangleandthemethodhasverygoodperspectiveofapplication.Keywords:railwaybridge;orthotropicplatebridgedecking;multi—scalemodeling;dynamicboundaryapprox
8、imation;dynamiceffect;finiteelementmethod收稿日期:2014—11—24基金項(xiàng)目:中央高?;究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金項(xiàng)目(2014YJSO96