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时间:2020-05-14
《连续刚构铁路桥收缩徐变效应监测与分析.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43卷第4期江汉大学学报(自然科学版)Vo1.43No.42015年8月J.JianghanUniv.(Nat.Sci.Ed.)Aug.2015连续刚构铁路桥收缩徐变效应监测与分析程辉,王鸣辉,梅秀道,叶仲涛。,王翔(1.桥梁结构与健康湖北省重点实验室,湖北武汉430034;2.中铁大桥局集团武汉桥梁科学研究院有限公司,湖北武汉430034)摘要:对连续刚构铁路桥箱梁温度场及桥梁线形进行长期、连续监测,通过主梁跨中下挠的理论与实测对比揭示了连续刚构铁路桥收缩徐变效应。对比了国内外常用收缩徐变估算模
2、型,选择CEB—FIP徐变模型对黄河特大连续刚构桥进行了有限元分析。采用实测温度数据,以箱梁内测温度、外侧温度、顶底板温度梯度、左右侧温度梯度作为箱粱温度场的评判指标,对箱梁1年内的四季温度场分布进行分析。在基于相同温度场的条件下,通过理论值与实测值对比,发现分析成果与实测结果较吻合,说明混凝土的收缩徐变是引起连续刚构铁路桥跨中下挠的主要原因,对比结果还说明通过改善箱梁顶底板应力差能够改善收缩徐变长期效应。关键词:连续刚构;温度场;线形;CEB—FIP;收缩徐变中图分类号:U446.2文献标志码:A
3、文章编号:1673—0143(2015)04—0323—05D0I:10.16389~.cnki.cn42—1737,n.2015.04.007MonitoringandAnalysisonShrinkageandCreepEfectsofContinuousRigidFrameBridgeCHENHui一,WANGMinghui一,MEIXiudao一,YEZhongtao一,WANGXiang,(1.KeyLaboratoryofBridgeStructureSafetyandHealthofH
4、ubeiProvince,Wuhan430034,Hubei,China;2.BridgeScienceResearchInstituteLtd.,ChinaRailwayMajorBridgeEngineeringGroup,Wuhan430034,Hubei,China)Abstract:Forlong—termandcontinuousmonitoringoftherailwaybridgeboxbeamtemperaturefieldandthebridgealignmentofcontin
5、uousrigidframebridge,throughthecomparisonoftheoreticalandmeasuredvalueofexcessivedeflectioninthemidspanofgirder,revealedtheshrinkageandcreepeffectsofthebridge.Thecommonuseddomesticandoverseasshrinkageandcreepestimationmodelswerecompared,andtheCEB-FIPcr
6、eepmodelwasselectedforfiniteelementanalysisoftheYellowRiverlargecontinuousrigidframebridge.Withthemeasuredtemperaturedata,andevaluationindexeswhichwereinnerandoutertemperatureofboxgirder,bottomandtoptemperaturegradient,leftandfighttemperaturegradient,t
7、oanalyzethetemperaturefielddistributionofboxgirderinfourseasonsinoneyear.Underthesametemperaturefield,throughthecomparisonoftheoreticalandmeasuredvalue,itwasfoundthattheanalysisresultswereconsistentwiththemeasuredresults,SOitillustratesthattheshrinkage
8、andcreepofconcretearethemainreasonsforexcessivedeflectioninthemidspanofrailwaycontinuousrigidframebridge,thecomparisonresultsalsoillustratethattheimprovementofstressdifferenceofroofandfloorofboxgirdercanimprovethelong—termshrinkageandcr
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