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时间:2020-03-27
《大跨度连续刚构拱组合桥梁拱墩结合块模型试验研究.pdf》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、第27卷第7期2.010年7月公路交通科技JoumalofHighwayandTransportationResearchalldDevelopmentV01.27No.7Jul.2010文章编号:1002-0268(2010)07-0069-07大跨度连续刚构拱组合桥梁拱墩结合块模型试验研究姜军,蒲黔辉,勾红叶(西南交通大学土木工程学院,四川成都610031)摘要:简单介绍了模型试验的相似和设计原则,对模型试验的加我工况、加载程序、测点布置等也进行了讨论。应用大型COSMOS/Works软件,结合已有的研究成果,在选定混凝土、钢筋和钢绞线单元
2、的基础上,建立了边主墩和中主墩梁拱墩结合块三维有限元模型,得到数值分析结果,将数值计算结果与试验结果进行对比分析,得出了顶底板、腹板、拱脚和墩顶混凝土应力分布规律,深入研究了梁拱墩结合块的复杂受力行为。研究表明:顶底板混凝土正应力沿纵向均呈先减小再增大的趋势;腹板混凝土正应力沿竖向从上至下呈增大趋势,沿纵向正应力呈先减小、后增大和再减小的趋势;拱脚混凝土主压应力由后拱外侧往前拱内侧呈增大趋势;双薄壁墩和空心单柱墩墩顶混凝土各断面基本处于受压状态。梁拱墩结合块受力合理,大跨度连续刚构拱组合桥设计合理。关键词:桥梁工程;大跨度连续刚构拱组合桥;梁拱
3、墩结合块;受力行为;模型试验中图分类号:U448.22文献标识码:AExperimentalTestonModelofBeam,AmhandPierCombinationAreaofLong—spanContinuousRigidFrameCompositeArchBridgeJIANGJun,PUQianhui,GOUHongye(SchoolofCivilEn西ngering,SouthwestJiaotongUniversity,ChengduSichuan610031,China)Abstract:Thedesignprinciplea
4、ndsimilarityofthemodelofbeam,archandpiercombinationareawereintroduced.Theloadingmode,loadingprocedureandthearrangementofthemeasuringpointswerealsodiscussed.Basedontheselectedconcrete,steelandstrand,a3Dfiniteelementmodelofbeam,archandpiercombinationareaofsidemainpierandinterm
5、ediatemainpierwasestablishedbyapplicationoflarge—scaleCOSMOS/Workssoftwareincombinationwithexistingstudyresults.Thenumericalanalysisresultswel'eobtained.Comparedthemodeltestresultswiththetheoreticaloiles,thestressdistributionsofconcreteinroof,floor,web,archfootandpiertopwere
6、obtained.Thecomplicatedmechanicalbehaviorsofbeam,archandpiercombinationareawerefurtherstudied.Theresearchshowsthat(1)thenormalstressinconcreteofroofandfloorinlongitudinaldirectiondecreasesatfirst,thenincreases;(2)thenormalstressinconcreteofwebinverticaldirectionincreasesfrom
7、toptobottom,thenormalstressinlongitudinaldirectionincreasesatfirst,thendecreasesandthenincreasesagain;(3)themaincompressivestressinconcreteatarchfootincreasesfromlateralsideofbackarchtomedialsideoffrontarch;(4)thestressofconcreteateachsectionofdoublethin—wallpiertopandhollow
8、single—columnpiertoparebasicallyplacedinpressuredstate.Thebeam,archandpierc
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