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1、無背索曲塔曲梁斜拉橋參數(shù)敏感性分析世明1,2永健1（1.長安大學(xué)橋梁與隧道省重點(diǎn)實(shí)驗(yàn)室，710064；2.華北水利水電學(xué)院土木與交通學(xué)院，450011；）摘要：為研究無背索曲塔曲梁斜拉橋施工中各參數(shù)變化的影響，對橋梁施工過程進(jìn)行預(yù)控和參數(shù)誤差識別，確保成橋時(shí)主梁變形、塔頂位移、主梁應(yīng)力、塔底應(yīng)力和拉索索力達(dá)到設(shè)計(jì)狀態(tài)，以無背索曲塔曲梁斜拉橋——水道橋?yàn)楣こ瘫尘?，采用MIDAS/CIVIL空間有限元分析軟件，考慮結(jié)構(gòu)容重、混凝土彈性模量、拉索彈性模量、溫度作用等參數(shù)變化的影響，進(jìn)行了各參數(shù)的敏感性分析。
2、結(jié)果表明：主梁在y方向上變形的敏感參數(shù)為整體溫度作用，主梁在z方向上變形、主梁應(yīng)力、塔頂位移、塔底應(yīng)力以及拉索索力的敏感參數(shù)是整體溫度作用和容重；整體降溫時(shí)，主梁z方向最大位移增量為-12.2mm，位于主跨1/4跨徑附近，梁截面應(yīng)力增量在上、下緣的左右側(cè)相差較大，主梁的扭轉(zhuǎn)明顯，引起塔頂x、y、z方向的位移增量最值分別為7.4mm、3.2mm和-21.3mm，在塔底截面上、下緣均產(chǎn)生拉應(yīng)力增量，拉應(yīng)力增量最大值為7.28MPa，發(fā)生在左側(cè)塔底部截面左下緣；整體降溫和容重增加引起的索力增量最值分別為23
3、.24kN和18.11kN，其中，整體降溫時(shí)左、右側(cè)對應(yīng)拉索的索力增量表現(xiàn)出較大的差異，對應(yīng)拉索的索力增量差值最大達(dá)6.05kN。關(guān)鍵詞：橋梁工程；斜拉橋參數(shù)敏感性分析；有限元分析；無背索；曲塔；鋼-混組合梁中圖分類號：U448.22文獻(xiàn)標(biāo)識碼：ASensitivityAnalysisofParametersforCurved-pylonandCurved-girderCable-stayedBridgewithoutBack-staysLIUShiming，LIUYongjian（1.KeyLabo
4、ratoryforBridgeandTunnelofShaanxiProvince,Chang'anUniversity,Xi'an710064,china;2.NorthChinaInstituteofWaterConservancyandHydroelectricPower,Zhengzhou450011,China;）Abstract：Inordertostudytheinfluenceofparametersforcurved-pylonandcurved-girdercable-stayed
5、bridgewithoutback-staysduringconstruction,toprecontroltheconstructionprocessandidentifytheparametererror,tobesurethedeformationofthebeamandthetopofthepylon,stressofbeamandthepylonbottom,cableforceofthestaycablewhichbecorrespondingtothedesignvalueattheco
6、mpletionofthebridgeconstruction,accordingtotheconstructionofDongguanshuidaobridge,whichisacurved-pylonandcurved-girdercable-stayedbridge,theanalyticalmodelisfoundedthroughthefiniteelementanalysissoftwareMIDAS/CIVIL,andtheparameterschangesuchasstructural
7、unitweightandconcreteelasticitymodulusandcableelasticitymodulusandtemperatureactionareconsidered,sensitivityanalysisoftheparametersarecarriedout.Theresultsshowthatthesensitiveparameterofthedeformationofthebeamatthedirectionofyaxisistemperature,andthesen
8、sitiveparametersofthedeformationofthebeamatthedirectionofzaxisandstressofthebeamandthedeformationofthetoppylonandthestressofthepylonbottomaretemperatureandstructuralself-weight;themaximumdeformationincrementatthedirectionofzaxiso
