粉房湾长江大桥防船撞设计

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1、桥梁建设2012年第42卷增刊1(总第216期)28BridgeConstruction，Vo1．42，SupplementNo．1，2012(TotallyNo．216)文章编号：1003—4722(2012)Sl一0028—05粉房湾长江大桥防船撞设计冯玉涛，曹正洲，马奎，黄明庆，甘林坤。(1．重庆市交通规划勘察设计院，重庆40112l；2．重庆市公路局，重庆401147)摘要：粉房湾长江大桥主桥为双塔双索面连续钢桁梁斜拉桥。结合该桥防撞特点，经分析，该桥采用将P3、P4主墩(桥塔下塔柱底部)高程195．347m以下部分设置

2、为实心截面的防船撞方案。为检验大桥防船撞设计是否满足规范要求，采用LS—DYNA非线性有限元分析程序和MIDASCivil程序分别对P3、P4主墩总体抗船撞能力和船舶局部撞击力作用下被撞位置的局部强度进行分析。分析结果表明：P3、P4主墩总体承载能力满足规范和船撞抗力要求；下塔柱被船舶撞击位置局部角点出现拉应力超过C50混凝土自身抗拉强度的问题，通过增设构造钢筋解决该问题，最终使下塔柱被撞击部位局部强度满足规范和船撞抗力要求。关键词：斜拉桥；公轨两用桥；桥墩；防撞设计；有限元法中图分类号：U442．5；U448．27文献标志码：

3、ADesignofShipCollisionProtectionforFenfangwanChangjiangRiverBridgeFENGYu—tao，CAOZheng—zhou，MAKui，HUANGMing—qing，CANLin—kun(1．ChongqingCityTransportPlanning，SurveyandDesignInstitute，Chongqing401121，China；2．AdministrationofHighways，ChongqingCity，Chongqing401147，China)A

4、bstract：ThemainbridgeofFenfangwanChangJiangRiverBridgeisacontinuoussteeltrussgirdercablestayedbridgewithdoublepylonsanddoublecableplanes．Inviewofthecharacteris—ticsofshipcollisionprotectionforthebridgeandaccordingtotheanalysis，thepartsofthemainpiersP3andP4(footingsof

5、thelowerpyloncolumns)ofthebridgebelowtheelevation195．347mweredesignedasthesolidsectionsoftheshipcollisionprotection．Tocheckifthedesignoftheshipcollisionprotectionforthebridgecouldmeettherelevantrequirementsinthecodes，thenon—linearfiniteelementanalysisprogramLS—DYNAan

6、dtheprogramMIDASCivilwereusedtore——spectivelyanalyzetheglobalshipcollisionprotectioncapacityofthepiersP3andP4andtheLocalstrengthofthecollidedpartsofthepiersundertheactionofthelocalcollisionoftheships．Theresultsoftheanalysisshowthattheglobalload—bearingcapacityofthepi

7、erscanmeettherelevantrequirementsinthecodesandfortheshipcollisionprotection．However，theproblemthatthetensilestressintheangularpointsofthelocalpartsofthelowerpyloncolumnscollidedbytheshipsisgreaterthanthetensilestrengthoftheC50concreteitselfappearsandbywayofaddingrein

8、forcementtotheparts，thestrengthofthepartsisfinallymadetomeettherequirementsinboththecodesandtheshipcollisionprotectiondesign．Keywor