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1、多塔大跨鐵路斜拉橋方案研究張燕飛,高宗余,梅新詠55文章編號:1003—4722(2010)03—0055—04多塔大跨鐵路斜拉橋方案研究張燕飛,高宗余,梅新詠(中鐵大橋勘測設計院有限公司,湖北武漢430056)摘要:多塔斜拉橋主要靠梁、塔等單個構件來承受外荷載,其剛度差、溫度效應較為明顯,以某跨長江橋梁工程為背景進行多塔大跨鐵路斜拉橋方案研究。在基準模型的基礎上,通過增加塔、梁剛度或采用新型纜索體系建立其他模型,計算斜拉橋主跨撓度、橋塔內(nèi)力等參數(shù)的變化,經(jīng)計算表明可通過這些措施提高橋跨結構剛度。并提出塔頂加水平系索(方案1,結構效率較高、能有效減小基礎內(nèi)力)和采用雙壁墩橋塔(方案2,
2、結構受力簡單)2種設計方案。由于該工程橋塔基礎受船撞力控制設計,最終推薦了方案2。通過與普通鋼桁梁和混凝土箱桁結合梁比較,主梁選擇了具有剛度大、承載力高、橋面整體性好的鋼箱桁結合梁截面。關鍵詞:大跨度橋;鐵路橋;斜拉橋;方案;橋梁設計中圖分類號:U448.13;U448.27文獻標志碼:AStudyofOptionsforMulti·_PylonLongSpanRailwayCable--StayedBridgeZHANGYan—fei,GAOZong-yu,MEIXin—yong(ChinaRailwayMajorBridgeReconnaissance&DesignInstitut
3、eCo.,Ltd.,Wuhan430056,China)Abstract:Themulti—pyloncable—stayedbridgeisaonethatmainlyreliesonitssinglestruc—turalelementlikethegirderandpylontocarryexternalloadandtheweakrigidityandtempera—tureeffectofthebridgeareobvious.BywayofexampleofabridgetObebuiltovertheChangjiangRiver,theoptionsforthemult
4、i—pylonlongspanrailwaycable—stayedbridgearestud—ied.Basedonthedatummodelandbyincreasingtherigidityofthegirderandpylonorbyusingothermodelestablishedwithnewcablesystem,theparametervariationsofthemainspandeflec—tionandthepyloninternalforceofsuchtypeofthebridgearecalculated.Theresultsofthecal—culati
5、onindicatethatwiththemeasuresmentionedabove,thestructuralrigidityofbridgespanscanbeenhanced.Twodesignoptionsofaddinghorizontallinkcablesattopofthepylon(Option1isofhighstructuralefficiencyandcanreduceinternalforceinfoundation)andapplyingdouble—wallpiersforthepylon(Option2issimpleinstructuralforce
6、conditions)aredeveloped.Becausethepylonfoundationdesignofthebridgeisgovernedbytheshipcollisionforce,theoption2isthusrecommended.Throughcomparisonofthecommonsteeltrussgirderandtheconcreteboxandtrusscompositegirder,thecrosssectionofthesteelboxandtrusscompositegirderthathashighrigidity,greatcarryin
7、gcapacityandgooddeckintegrityischosen.Keywords:longspanbridge;railwaybridge;cable—stayedbridge;option;bridgedesign收稿日期:2010一Ol一26作者簡介:張燕飛(1972一),男,高級工程師,1995年畢業(yè)于西南交通大學土建結構工程專業(yè),工學學士(zhangyanfei@brdi.com.cn)。56橋梁建設2010年第3期1前言度