大跨度组合梁斜拉桥结构设计方案研究.pdf

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1、桥梁建设2016年第46卷第4期(总第239期)BridgeConstruction，V01．46，No．4，2016(TotallyNo．239)85文章编号：1003--4722(2016)04--0085--07大跨度组合梁斜拉桥结构设计方案研究詹建辉(湖北省交通规划设计，彭晓彬院，湖北武汉430051)摘要：为使大跨度组合梁斜拉桥的结构性能更优，以某(80+290+768+70+70+70+60)m双塔双索面半飘浮体系混合梁斜拉桥方案为背景，从主梁断面型式、主梁参数(梁高、断面面积、桥面

2、板厚度)、桥塔高度、桥面铺装及主梁钢一混结合段位置等对结构性能的影响进行对比分析。结果表明：主跨800m左右的组合梁斜拉桥在理论计算分析上具备可实施性；箱形断面组合梁较为适合用于大跨、宽幅组合梁斜拉桥；提高钢主梁断面的有效面积和桥塔高度对改善组合梁斜拉桥受力状况有较大帮助；大跨度组合梁斜拉桥桥面铺装厚度应结合总体受力、大气环境、荷栽类型等因素考虑；钢一混结合段位置选取应兼顾受力特性、施工工艺简便和经济性。关键词：斜拉桥；组合梁；主梁型式；主梁参数；塔高；桥面铺装；结合段；结构设计中图分类号：U4

3、48．27；U442．5文献标志码：AStudyofStructuralDesignSchemeforLongSpanCompositeGirderCable-StayedBridgeZHANJian-hui，PENGXiao-bin(HubeiProvincialTransportPlanningandDesignInstitute，Wuhan430051，China)Abstract：Tomakethestructuralperformanceoflongspancompositegirde

4、rcable—stayedbridgemoreoptimal，thedesignschemeofasemi—floatingsystemcompositeandhybridgirderca—ble—stayedbridgewithdoublepylons，doublecableplanesandwithspanarrangement(80+290+768+70+70+70+60)mwasselectedasanexampleandtheinfluencesofthemaingirdersecti

5、ontypes，maingirderparameters(e．g．thegirderdepth，girdersectionareasanddeckslabthick—ness)，pylonheight，deckpavementthicknessandthelocationsofthesteelandconcreteiointsec—tionsofthemaingirderonthestructuralperformanceofthecompositegirdercable—stayedbridg

6、ewerecomparativelyanalyzed．Theresultsoftheanalysisindicatethatinpointofthetheoreticcal一culationandanalysis，theschemeofthecompositegirdercable-stayedbridgewithamainspanofabout800mcanbeimplemented．Thecompositegirderofboxsectionismoreapplicabletothelong

7、spanandwidedeckcable—stayedbridge．Theincreaseoftheeffectiveareaofthesteelmaingirdersectionandtheincreaseofthepylonheightarehelpfultotheimprovementoftheforcecon—ditionsofthecompositegirdercable～stayedbridge．Thedeterminationofthedeckpavementthick—nesso

8、fthecompositegirdercable—stayedbridgeshouldconsiderthegeneralforceCOnditions，theatmosphericenvironmentandtheloadtypesandtheselectionofthelocationofthesteelandcon—cretejointsectionshouldsimultaneouslyconsidertheforcebehavior，constructiontechn0109ysim—