角钢支承钢管架防撞设施的性能分析.docx

文章编号:1000-9779(2008)03-0007-06角钢支承钢管架防撞设施的性能分析李传习,罗琳(长沙理工大学土木与建筑学院,湖南长沙410076)摘要:为猎德大桥9#墩设计了角钢支承钢管架防撞设施.根据显式瞬态非线性有限元分析技术,考虑了碰撞中的材料非线性、几何非线性、接触非线性、运动非线性以及它们之间相互耦合的特性,用ANSYS/LS-DYNA软件建立了包含9#墩防撞设施和碰撞船的有限元数值仿真模型.仿真结果反映了角钢支承钢管架防撞结构的基本性能,碰撞的整个时间历程得以全面的模拟实现.获得了角钢和钢管不同参数变化的情况下防撞设施撞深、撞击力及吸能等参数的变化情况.从总体上说,撞深随着撞击力的增加而增加,防撞装置在抵抗撞击时,钢管起到主要吸能的作用,角钢的吸能值约为钢管的1/5.在设计时,钢管的直径不必设计得过大,角钢的尺寸设计应以撞深的要求为基础.关键词:桥梁工程;防撞设施;角钢支承钢管架;性能分析中图分类号:U443.26;U661文献标识码:AAnalysisofanti2collisionequipmentofsteelpipetrusssupportedbysteelanglesLIChuan2xi,LUOLin(SchoolofCivilandConstruction,ChangshaUniversityofScienceTechnology,Changsha410076,China)Abstract:Anti2collisionequipmentofsteelpipetrusssupportedbysteelanglesisdesignedfor9#pierofLie2deBridge.BasedontheANSYS/LS2DYNAnonlinearFEMprogram,nonlinearFEMwithmomentarydisplayfunctionisappliedtoestablishingthecollisionmodelofship2collisionprotectionofthebridge.Manycharac2tersaretakenintoaccount,suchasmaterialnonlinearity,geometricnonlinearity,contactnonlinearityandcouplingcharactersamongthem,etc.Theresultcanreflectthebasiccapabilityofanti2collisionequipmentofsteelpipetrusssupportedbysteelangles,thecourseofcollisionissimulatedperfectly.Thecourseofabsorb2ingenergy,collisiondepthandcollisionforceofshipareconsideredwithdifferentsteelpipediametersanddif2ferentsteelanglessizes.Atthesametime,designideaisbroughtforwardaccordingtotheprincipleofthecostandtheavailability.Thedepthofcollisionwillincreaseiftheforceofcollisionincreasesgenerally.Kineticenergyofshipisbasicallyabsorbedbysteelpipetrussintheformofinternalenergy,internalenergyabsorbedbysteelanglesisabout20percentofthesteelpipetruss.Thediameterofsteelpipetrussisnottoolargeindesign,thesizedesignofsteelanglesshouldbebasedontherequirementsofcollisiondepth.Keywords:bridgeengineering;anti2collisionequipment;steelpipetrusssupportedbysteelangles;analysis当船舶直接撞击墩身时,桥墩会承受巨大的撞击力.如果按墩身直接承受船舶撞击进行设计,则这收稿日期:2008-03-21作者简介:李传习(1963-),男,长沙理工大学教授,博士生导师.8长沙交通学院学报第24卷些构筑物将硕大无比,影响航道的通航能力[1];如果将桥墩避开航道,则导致桥梁跨度增大,桥型改变,增大投资.为了解决桥墩受船撞这一问题,工