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1、橋梁建設(shè)2015年第45卷第4期(總第233期)BridgeConstruction,Vo1.45,No.4,2015(TotallyNo.233)33文章編號(hào):1003—4722(2015)04-0033—06大跨度梁拱組合橋的梁軌相互作用設(shè)計(jì)參數(shù)研究戴公連,劉瑤(1.中南大學(xué)土木工程學(xué)院,湖南長(zhǎng)沙410075;2.高速鐵路建造技術(shù)國(guó)家工程實(shí)驗(yàn)室,湖南長(zhǎng)沙410075)摘要:為了解梁軌相互作用設(shè)計(jì)參數(shù)對(duì)大跨度梁拱組合橋無(wú)縫線(xiàn)路的影響,以蘭渝線(xiàn)廣元段某(82.9+172+82.9)m梁拱組合橋?yàn)槔?,采用ANSYs軟件建立了考
2、慮拱肋一吊桿一主梁一橋墩一樁基一軌道粱軌系統(tǒng)一體化有限元模型,分析了拱肋與吊桿升溫、縱向阻力模型、吊桿間距、橋墩高度、制動(dòng)力率、風(fēng)荷載等參數(shù)對(duì)鋼軌縱向力的傳遞規(guī)律。結(jié)果表明:拱肋升溫對(duì)鋼軌應(yīng)力的影響較大,計(jì)算鋼軌伸縮力時(shí),按梁體升溫15℃考慮較為安全;梁拱組合橋的梁軌相互作用根據(jù)《鐵路無(wú)縫線(xiàn)路設(shè)計(jì)規(guī)范》計(jì)算較為安全;鋼軌制動(dòng)力隨固定墩高度的增加而增大,固定墩的墩項(xiàng)水平力與其墩高基本呈線(xiàn)性遞減關(guān)系;鋼軌應(yīng)力隨吊桿間距的增大而增加;鋼軌的最大制動(dòng)拉、壓應(yīng)力和固定墩的墩頂水平力均與制動(dòng)力率呈線(xiàn)性關(guān)系;風(fēng)荷載作用下,鋼軌應(yīng)力可達(dá)5.
3、8MPa以上,風(fēng)速較大區(qū)域需考慮風(fēng)荷載對(duì)鋼軌的影響。關(guān)鍵詞:鐵路橋;梁拱組合橋;無(wú)縫線(xiàn)路;設(shè)計(jì)參數(shù);梁軌相互作用;有限元法;鋼軌應(yīng)力中圖分類(lèi)號(hào):U448.13;U213.912文獻(xiàn)標(biāo)志碼:AStudyofDesignParametersofBeam’·TrackInteractionofLongSpanHybridBridgeofBeamandArchDAIGong—lian~.LIUYao(1.SchoolofCivilEngineering,CentralSouthUniversity,Changsha410075,Ch
4、ina;2.NationalEngineeringLaboratoryforHigh—SpeedRailwayConstruction,Changsha410075,China)Abstract:Tounderstandtheeffectofthedesignparametersofbeam-trackinteractiononthecontinuouslyweldedrai1onlongspanhybridbridgeofbeamandarch,ahybridbridgeofbeamandarchwithspanarran
5、gement(82.9+172+82.9)montheGuangyuansectionofLanzhou—ChongqingRailwaywastakenasanexample,afiniteelementmodelconsideringtheintegrationofthearchrib—hangers-mainbeam—piers—pilefoundations-beam—tracksystemwasestablished,usingthesoftwareANSYSandtheeffectofthedesignparam
6、eters,suchasthetemperatureriseinthearchribandhangers,longitudinalresistancemodels,hangerspacings,pierheight,brakingforceratiosandwindload,onthelongitudinalforcetransmissionlawsofthesteelrailwasana—lyzed.Theresultsoftheanalysisshowthattheeffectofthetemperaturerisein
7、thearchribonthesteelrailstressisgreatandwhenthesteelrailexpansionforceiscalculated,thecalculationaccord—ingtothetemperatureriseof15℃inthebeamiSsafe.Whenthebeam—trackinteractionofthehy—bridbridgeiscalculated,thecalculationoftheinteractionaccordingtotheCodeforDesigno
8、fRailwayContinuousWeldedRailissafe.Thebrakingforceofthesteelrailincreaseswiththein—creaseofthefixedpierheightandthepiertophorizontalforceofthefix