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时间:2020-03-27
《响应面法在高墩大跨连续刚构桥长期变形预测中的应用.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31卷第1期2014年1月公路交通科技JournalofHighwayandTransportationResearchandDevelopmentV01.31No.1Jan.2014doi:10.3969/j.issn.1002—0268.2014.01.015响应面法在高墩大跨连续刚构桥长期变形预测中的应用张亮亮1,张(1.重庆大学土木工程学院,重庆400045;伟1”,张康12.重庆高速公路集团有限公司,重庆401121)摘要:为提高高墩大跨连续刚构桥长期变形预测的精度,重点考虑徐变对结构长期变形的影响,并考虑影响徐变系数众因素的随机性,将响应面法引入到
2、结构长期变形的预测中。试验抽样采用中心复合设计法,响应面模型采用不含交叉项的二次多项式。采用偏检验进行影响参数的显著性检验,将徐变系数表达式表达成各随机变量的显示函数,并对其进行蒙特卡罗抽样分析,然后将其代入有限元模型中得到一定置信区间下的长期变形值。牛角坪大桥主跨192m,按照上述方法对主跨跨中的变形进行计算,并和实测结果对比,二者吻合度较高,实现了提高高墩大跨连续刚构桥长期变形预测精度的目标。关键词:桥梁工程;连续刚构桥;高墩大跨;徐变;响应面法;长期变形中图分类号:U445.7文献标识码:A文章编号:1002—0268(2014)01—0077—05App
3、licationofResponseSurfaceMethodinPredictingLong-termDeflectionofLong-spanRigidFrameBridgewithHigh—risePiersZHANGLiang.1ian91,ZHANGWeil一,ZHANGKan91(1.DepartmentofCivilEngineering,ChongqingUniversity,Chongqing400045,China;2.ChongqingExpresswayGroupCo.,Ltd.,Chongqing401121,China)Abstrac
4、t:Inordertoincreasetheaccuracyofpredictingthelong—termdeflectionoflong·spanrigidflamebridgewithhigh—risepiers,theinfluenceofcreeponthelong—termdeformationispinpointed.Consideringtheuncertaintyoffactorsinfluencingcreepcoefficient,theresponsesurfacemethodisintroducedintothelong-termdef
5、ormationforecastofbridgestructures.Centralcompositedesignmethodisusedfortheexperimentalsamplingandquadraticpolynomialwithoutcross—termisusedtodescribetheresponsesurfacemodel.PartialFtestisusedtoconductsignificancetestingofinfluencingfactors,anddisplayingfunctionofrandomvariablesisuse
6、dtoexpressthecreepcoefficientexpression.Finally,thelong—termdeformationValueswithconfidenceintervalareobtainedfromfiniteelementmodelbyMonteCarlosamplinganalysis.BasedonNiujiaopingBridgewhosemainspanis268m,itslong-termdeformationofmid-spaniscalculatedusingresponsesurfacemethodandcompa
7、redwiththemeasuredresult.Theresultindicatesthatthereishigheragreementbetweenthetwo.Theresponsesurfacemethodcanimprovetheaccuracyofpredictingthelong—termdeformationoflong—spanrigidflamebridgewithhigh-risepiers.Keywords:bridgeengineering;continuousrigidflamebridge;long-spanwithhighpier
8、s;creep;resp
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