大跨径钢箱提篮拱桥空间稳定性分析

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1、大跨径钢箱提篮拱桥空间稳定性分析曹正洲，冯玉涛，沈逢俊43文章编号：1003—4722(2011)Ol一0043—05大跨径钢箱提篮拱桥空间稳定性分析曹正洲，冯玉涛，沈逢俊(重庆市交通规划勘察设计院，重庆401121)摘要：随着提篮拱桥跨径的增加，其空间稳定性问题愈发突出，为对大跨径提篮拱桥稳定性以及各稳定性影响因素进行分析，可采用线性屈曲和非线性屈曲2种方法。重庆朝阳复建桥为主跨274m的中承式钢箱提篮拱桥，通过建立空间有限元模型对结构线弹性稳定及几何非线性稳定进行分析表明：考虑几何非线性因素后结构的1阶稳定系数显著减小，几何非线性对结构稳定性影响显著

2、。对影响结构整体稳定性的因素进行计算分析表明：拱肋内倾角变化对稳定性影响较大，提篮拱内倾角增大，结构的1阶稳定系数增加，但过大的内倾角将导致拱肋扭转失稳；随着矢跨比(宽跨比)的增加，结构的l阶稳定系数增大(减小)；横撑、吊杆布置形式对结构稳定性影响较小。关键词：提篮拱桥；稳定性；有限元法；分析中图分类号：U448．22；TU311．41文献标志码：AAnalysisofSpatialStabilityofLongSpanSteelBOXBasketHandleArchBridgeCAOZheng—zhou，FENGYu—tao，SHENFeng‘jun(

3、ChongqingCityTransportPlanning，SurveyandDesignInstitute，Chongqing401121，China)Abstract：Withtheincreaseofspanlengthofbaskethandlearchbridge，theproblemofspa—tialstabilityofthebridgebecomesevenmoreprominent．Foranalysisofthestabilityandthefac—torshavinginfluenceonthestabilityoflongsp

4、anbaskethandlearchbridge，twomethodsofthelinearbucklinganalysisandnonlinearbucklinganalysismaybeused．TheChaoyangRebuiltBridgeinChongqingisahalf-throughsteelboxbaskethandlearchbridgewithamainspan274m．Thelinearelasticstabilityandgeometricnonlinearstabilityofthestructureareanalyzed，u

5、—singthespatialfiniteelementmodels．Theresultsoftheanalysisshowthatasthegeometricnon—linearfactorsaretakenintoaccount，the1storderstabilitycoefficientofthestructureapparentlydecreasesandtheinfluenceofthegeometricnonlinearityonthestabilityofthestructureisappar—ent．Thefactorshavingin

6、fluenceontheglobalstabilityofthestructurearealsocalculatedandanalyzed．Theresultsofthecalculationshowthattheinfluenceofvariationsoftheleaningangleofarchribonthestabilityisgreat．Astheleaningangleofthebaskethandlearchincreases，the1storderstabilitycoefficientincreases，however，thetOOb

7、igIcaninganglewillresultinthetor—sionalinstabilityoftheribandastherise—to—spanratio(width—tO—spanratio)increases，the1storderstabilitycoefficientincreases(decreases)．TheinfluenceOfthearrangementwaysoflateralbracingsandhangersonthestabilityofthestructureislittle．Keywords：baskethand

8、learchbridge；stability；finiteelementmeth