崇启大桥主桥钢箱梁高腹板设计

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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。

2、腹板横肋纵向间距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，

3、XUChun—rong，ZHUBin，WANGZhi—cheng，WEILe—yong(CCCCHighwayConsultantsCo．，Ltd．，Beijing100088，China)Abstract：ThemainbridgeoftheChongqiBridgeisasix—spancontinuoussteelboxgirderbridgewithvariablesectionandwithspanarrangement(102+4×185+102)mandthegreatestdepthoftheboxgirderofthemainbridgeis9m．

4、Inthedesignofthedeepwebsforthegirder，theprovisionsintherelevantdomesticandforeignstandardsorcodeswerestudiedandthedesignandcheckingcalculationprocedureswereformulated．Inthedifferentsectionsofthegirderinthelongitudinaldirectionofthebridge，thewebsweredesigned，using4kindsofthicknessofstee

5、lplatesandinsidethegirder，thewebswerekeptinthesameleve1．Thelongitudinalspacingofthetransverseribsofthewebsis1．4m．ThestiffeningribsofthewebsarealloftheT—shaperibsandthelongitudinalribsofthewebsweremadeofflatstee1．Forthelongitudinalribsclosetothebottomplatesofthegirderblocksnearbypiertop

6、，theywereweldedwiththetransverseribswhileforthelongitudinalribsattherestpartsofthewebs，theywerecutoffattheintersectionofthetransverseribs．Intermsoftheprovisionsinthestandardsorcodes，thestrengthandmini—mumthicknessofthewebs，therationalityoflocationsandrigidityofthelongitudinalribs，thesp

7、acingandrigidityofthetransverseribsandthelocalstabilityofthegridofthelongitudinalandtransverseribswerecalculated．TheplateelementmodelforhalfofthebridgewasestablishedbytheANSYSandthestrengthand1oca1stabilityofthewebswerechecked．Theresultsofthecat—culationandcheckingdemonstratethatthed