拱形塔悬索斜拉组合结构桥梁的设计与施工黄士柏，郝俊峰，徐海军45文章编号：1003—4722(2O】O)01—0045—04拱形塔悬索斜拉组合结构桥梁的设计与施工黄士柏，郝俊峰，徐海军(同济大学桥梁工程系，上海200092)摘要：龙城大桥采用三跨拱形塔悬索斜拉组合结构，其跨径布置为(72+l14+30)m。拱形桥塔由索塔及次塔组成，索塔为变截面拱形钢箱结构；次塔与索塔交角为60。。主梁为箱形结构。利用MIDASCivil软件进行结构整体分析，在结构重力下主缆的张力约为53000kN；根据初始平衡状态，进行倒拆分析，确定缆索的下料长度和空间坐标。主缆采用三段式散索装置锚目；设计新型的钢锚箱，使缆索在小空间内实现较大集中力的锚固。钢索塔采用现场拼装、竖向转体(扳起法)的方法施工。每边吊杆分3组，每组同时张拉4根，以对主缆进行加载与调位。关键词：悬索斜拉组合结构；结构特点；结构分析；桥梁设计；桥梁施工中图分类号：U448．25；U442．5文献标志码：ADesignandConstructionofaHybridSuspensionandCable。·StayedBridgewithArchPylonHUANGShi—bai，HAOJun—feng，XUHajun(DepartmentofEngineeringBridge，TongjiUniversity，Shanghai200092，China)Abstract：TheLongchengBridgeisathree—spanhybridsuspensionandcable—stayedbridgewitharchpylonandwithspanarrangement(72+114+30)m．Thearchpylonismadeupoftwopartsofthecablepylonandthesecondarypylon．ThecablepylonisasteelboxstructurewithvariablecrosssectionandtheangleofintersectionbetweenthecablepylonandthesecondaryPy—Ionis6O。．Themaingirderisalsoaboxstructure．BymeansoftheMIDAS／Civilsoftware，theglobalstructureoftheBridgeisanalyzedandthetensileforceofthemaincablesundertheactionofthestructuralgravityisdeterminedtobe53000kN．Inaccordancewiththeinitialequilibriumstatus，theinverseanalysisismadetoobtainthesetting—outlengthandthespatialcoordinateofthemaincables．Theanchorageforthecablesareusedwiththethree—sectionsplaysaddles，thenewtypeofthesteelanchorboxesaredevelopedSOthatthecablescanbeanchoredinarelativelygreatconcentrationforcewayinthenarrowspace．Thearchpylonisassembledatthesiteandisinstalledbytheverticalrotatingmethod(pulling—upmethod)．Thesuspendersoneachsideofthemaincablesareofthreegroupsandthefoursuspendersineachgrouparesimultaneouslyten—sionedtothedesignedvalueatonetimeeachtimeinordertoapplyloadtoandadjustthemainca—bles．Keywords：hybridsuspensionandcable—stayedbridge；structuralcharacteristic；structuralanalysis；bridgedesign；bridgeconstruction收稿日期：2009—11—13作者简介：黄士柏(1951一)，男，高级工程师，1983年毕业于同济大学分校城市道路与桥梁系，工学学士(hsb一0411@126．corn)