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时间:2019-05-22
《梁板桥拓宽后新桥各主梁沉降变形分布模式研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、桥梁建设2014年第44卷第4期(总第227期)BridgeConstruction,Vo1.44,No.4,2014(TotallyNo.227)75文章编号:1003—4722(2014)04—0075—05梁板桥拓宽后新桥各主梁沉降变形分布模式研究吴文清,杨松。,张立志(1.东南大学交通学院,江苏南京210096;2.安徽省交通规划设计研究总院股份有限公司,安徽合肥230088)摘要:为提出宽幅空心板梁桥拓宽后新桥各主梁合理的沉降变形横向分布模式,以京沪高速公路(江苏段)扩建工程中某宽幅空心
2、板k间A"支梁桥为背景进行试验研究与有限元分析。制作1:4实体缩尺试验模型,监测新旧桥基础沉降差分别为1,2,3mm时新桥各主梁的沉降变形,并利用Origin软件对沉降变形数据进行拟合分析处理;利用MIDASFEA软件建立全桥体单元有限元模型,进一步分析并拟定该沉降变形横向分布状态的曲线方程。结果表明:宽幅空心板梁桥拓宽时,在新桥基础沉降作用下新桥各主梁的竖向沉降变形横向分布模式与以往假设为线性分布模式时偏差比较大,应予纠正;综合考虑相关性和精度问题,在新桥基础沉降作用下新桥各主梁的沉降变形横向分
3、布模式假定为二阶曲线比较合理。关键词:板梁桥;简支梁桥;桥梁拓宽;基础沉降;横向分布模式;二阶曲线中图分类号:U448.212文献标志码:AStudyofDistributionPatternofSettlementDeformationofMainBeamsofaWidenedNewSlabBeamBridgeW【,Wen—qing。YANGSong。.ZHANGLi—zhi(1.SchoolofTransportation,SoutheastUniversity,Nanjing210096,C
4、hina;2.TransportConsulting&DesignInstituteCo.,Ltd.,Hefei230088,China)Abstract:Toworkouttherationa1transversedistributionpatternofsettlementdeformationofmainbeamsofthewidenednewwidevoidedslabbeambridge,asimply—supportedslabbeambridgeofthesamekindinthee
5、xtensionprojectoftheJiangsuSectionofBeijing——ShanghaiExpre+sswaywastakenasanexampleandtheteststudyandfiniteelementanalysiswerecarriedout.Thescaled—downtestmodelof1:4fortheexamplebridgewasprepared.Thesettlementdeform—ationofthemainbeamsofthenewbridgewa
6、smeasuredunderconditionthatthefoundationset—tlementdifferencesoftheoldandnewbridgeswererespectively1,2and3mm.ThesoftwareOr—iginwasusedtofitandanalyzethedataofthesettlementdeformation,thesoftwareMIDASFEAwasusedaswelltosetupthesolidfiniteelementmodelfor
7、thewholebridgeofthebridgeandtofurtheranalyzeanddevelopthecurveequationforthetransversedistributionstatusofthesettle—mentdeformation.Theresultsofthestudyindicatethatintheprocessofwideningofthewidevoidedslabbeambridge,undertheactionofthefoundationsettle
8、mentofthenewbridge,thetransversedistributionpatternoftheverticalsettlementdeformationofthemainbeamsofthenewbridgehasgreatdifferencesfromthepreviouslyassumedlineardistributionpatternandthedifferencesshouldberectified.Incomprehensiveconsideratio
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