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时间:2020-04-05
《崇启大桥主桥钢箱梁高腹板设计.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、桥梁建设2012年第42卷第2期(总第212期)66BridgeConstruction,Vo1.42,No.2,2012(TotallyNo.212)文章编号:1003—4722(2012)02—0066—07崇启大桥主桥钢箱梁高腹板设计孔庆凯,许春荣,朱斌,王志诚,魏乐永(中交公路规划设计院有限公司,北京100088)摘要:崇启大桥主桥采用(102+4×185+102)m六跨变截面钢箱连续梁桥,主桥钢箱梁最高达9m。在该桥高腹板设计过程中,对国内、外相关标准和规范进行研究,制定高腹板结构设计和验算思路。腹板在顺桥向不同区段采用4种不同的板厚,在箱梁内侧保持平齐。腹板横肋纵向间距
2、1.4m,加劲肋均采用T形构造;腹板纵肋采用扁钢构造。墩顶附近梁段靠近底板的腹板纵肋与横肋焊接,其余部位腹板纵肋在横肋处断开。按照规范方法对腹板强度、最小厚度及纵肋设置位置合理性、纵肋刚度、横肋间距和刚度、区格局部稳定性进行验算,并采用ANSYS建立半桥板单元模型,对腹板强度和局部稳定性进行校核,结果表明,腹板设计满足规范要求。关键词:连续梁桥;钢箱梁;腹板;设计;验算中图分类号:U442.5文献标志码:ADesignofDeepWebsforSteelBoxGirderofMainBridgeofChongqiBridgeKONGQing—kai,XUChun—rong,ZHUB
3、in,WANGZhi—cheng,WEILe—yong(CCCCHighwayConsultantsCo.,Ltd.,Beijing100088,China)Abstract:ThemainbridgeoftheChongqiBridgeisasix—spancontinuoussteelboxgirderbridgewithvariablesectionandwithspanarrangement(102+4×185+102)mandthegreatestdepthoftheboxgirderofthemainbridgeis9m.Inthedesignofthedeepwebs
4、forthegirder,theprovisionsintherelevantdomesticandforeignstandardsorcodeswerestudiedandthedesignandcheckingcalculationprocedureswereformulated.Inthedifferentsectionsofthegirderinthelongitudinaldirectionofthebridge,thewebsweredesigned,using4kindsofthicknessofsteelplatesandinsidethegirder,theweb
5、swerekeptinthesameleve1.Thelongitudinalspacingofthetransverseribsofthewebsis1.4m.ThestiffeningribsofthewebsarealloftheT—shaperibsandthelongitudinalribsofthewebsweremadeofflatstee1.Forthelongitudinalribsclosetothebottomplatesofthegirderblocksnearbypiertop,theywereweldedwiththetransverseribswhil
6、eforthelongitudinalribsattherestpartsofthewebs,theywerecutoffattheintersectionofthetransverseribs.Intermsoftheprovisionsinthestandardsorcodes,thestrengthandmini—mumthicknessofthewebs,therationalityoflocationsandrigidityofthelongitudinalribs,thespacingandrigidityofthetransverseribsandthelocalst
7、abilityofthegridofthelongitudinalandtransverseribswerecalculated.TheplateelementmodelforhalfofthebridgewasestablishedbytheANSYSandthestrengthand1oca1stabilityofthewebswerechecked.Theresultsofthecat—culationandcheckingdemonstratethatthed
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