马鞍山长江公路大桥三塔悬索桥结构体系选择

《马鞍山长江公路大桥三塔悬索桥结构体系选择》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、马鞍山长江公路大桥三塔悬索桥结构体系选择唐贺强，张强，杨光武文章编号：1003—4722(2011)01—0005—05马鞍山长江公路大桥三塔悬索桥结构体系选择唐贺强，张强，杨光武(中铁大桥勘测设计院有限公司，湖北武汉430056)摘要：马鞍山长江公路大桥左汉主桥为主跨2×1080m的三塔悬索桥，为解决该桥在不平衡活载作用下引起中塔两侧主缆缆力差值较大的问题，需要选择合理的结构体系，对塔梁固结、支座约束、半飘浮与全飘浮4种结构体系进行对比分析。采用有限元软件BNLAS分析4种结构体系的力学特性，计算结果表明：塔梁固结结构体系抗滑安全系数最

2、高、结构刚度最大、中塔钢结构段应力在容许范围内、抗风与抗震性能优于飘浮体系、不需要设置支座；4种结构体系在缆索受力方面差异很小；塔梁固结体系加劲梁受力较大但可以通过调整梁高来控制应力。经综合比选，该三塔悬索桥最终采用塔梁固结的结构体系。关键词：悬索桥；结构体系；固结；计算分析；刚度；稳定性中图分类号：U448．25；U442．54文献标志码：ASelectionofStructuralSystemforThree‘_TowerSuspensionBridgeofMaanshanChangjiangRiverHighwayBridgeTAN

3、GHe—qiang，ZHANGQiang，YANGGuang—WU(ChinaRailwayMajorBridgeReconnaissance&DesignInstituteCo．，Ltd．，Wuhan430056，China)Abstract：ThemainbridgeofMaanshanChangjiangRiverHighwayBridgeovertheleftbranchisathree—towersuspensionbridgewithmainspanarrangement2X1080m．Toresolvetheproblemo

4、fconsiderablecableforcedifferencesofthemaincablesateithersideoftheinterme—diatetowerofthebridgeduetotheactionofunbalancedload，therationalstructuralsystemshouldbeappropriatelyselected．Fourtypesofthestructuralsystemsofthetower—to—girderrigidfixity，bearingrestraint，semi-floa

5、tingandcompletefloatingarecomparedandanalyzedandthefiniteelementsoftwareBNLASiSusedtOanalyzethemechanicalbehaviorofthestructuralsys—terns．Theresultsofcalculationindicatethattheslipresistancesafetycoefficientofthetower—to—girderrigidfixitysystemisthehighestandthestructural

6、rigidityisthegreatest．Thestressinthepartofsteelstructureoftheintermediatetoweriswithintheallowablerange，thewindresist-anceandseismicresistanceperformancearesuperiortothoseofthefloatingsystemsandthear—rangementofbearingsisnotnecessitated．Thecableforcedifferencesofthefourst

7、ructuralsys-ternsareverylittle．Thestressinthestiffeninggirderofthetower—tO—girderrigidfixitysystemisgreat，butitcanbecontrolledbyadjustingthedepthofthegirder．Throughthecomprehensivecomparisonandselection，thetower—to—girderrigidfixitystructuralsystemiseventuallychosenforthe

8、bridge．Keywords：suspensionbridge；structuralsystem；rigidfixity；calculationandanalysis；ri—gidity；s