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时间:2019-05-13
《采用单阶柱法分析连续体系梁式桥桥墩的计算长度》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2013年第43卷第1期(总第218期)78BridgeConstruction,Vo1.43,No.1,2013(TotallyNo.218)文章编号:1003—4722(2013)01—0078—05采用单阶柱法分析连续体系梁式桥桥墩的计算长度冯云成~,宋松林。(1.西安交通大学,陕西西安710049;2.中交第一公路勘察设计研究院有限公司,陕西西安710075)摘要:针对国内规范对桥墩计算长度系数取值偏小的情况,对连续体系梁式桥柱式桥墩计算长度影响因素进行分析,并提出采用有侧移框架的单阶柱计算桥墩计算长度的方法。该方法将连续体系粱式
2、桥纵向看作框架结构,上部结构视为横梁,并将桩基础和承台等效为单根柱,进而将与主梁铰接和固结的桥墩分别等效为上端自由和上端可移动但不可转动的单阶柱计算桥墩计算长度。以某跨径布置为(88+4×165+88)m的刚构一连续组合梁式桥为例,采用该方法计算其主墩计算长度系数,并与有限元软件MIDASCivil计算结果进行对比,结果表明:该方法计算结果与有限元软件计算结果较为吻合,且与美国AASHTO规范的规定基本一致,验证了该方法的可靠性。关键词:桥墩;计算长度;系数;单阶柱法;有限元法中图分类号:U443.22文献标志码:AAnalysisofEffec
3、tiveLengthofPiersofContinuousSystemBeamBridgeUsingSingle—SteppedColumnMethodFENGYun—Cheng.SONGSong—Lin。(1.xianJiaotongUniversity,Xian710049,China;2.CCCCFirstHighwayConsultantsCo.,Itd.,Xian710075,China)Abstract:Inviewofthesituationthatthevaluesoftheeffectivelengthcoefficientso
4、fbridgepiersspecifiedinthedomesticcodesareslightlylittle,thefactorshavinginfluenceontheeffec—tivelengthofthecolumnpiersofthecontinuoussystembeambridgewereanalyzedandthemeth—odforcalculationoftheeffectivelengthofthepiers,usingthesingle—steppedcolumnwithside—swayframe,wasdevelo
5、ped.Inthemethod,thelongitudinaldirectionofthecontinuoussystembeambridgewasregardedasaframestructure,thesuperstructureofthebridgewasregardedasatransversebeam,thefoundationpilesandpilecapwereequalizedasasinglecolumnandfurtherthepiershingedlyandrigidlyconnectedwiththebeamwereres
6、pectivelyequalizedasthesingle—steppedcolumnswiththeirupperendsbeingfree,movable,butnotrotatableforthesakeofcal—culationoftheeffectivelengthofthepiers.Bywayofexampleofarigid—frameandcontinuousgirderhybridbridgewithspanarrangement(88+4×165+88)m,theeffectivelengthcoefficientsoft
7、hemainpiersofthebridgewerecalculatedbythedevelopedmethodandthecalculationsofthemethodwerecomparedtothoseofthefiniteelementsoftwareMIDASCivil.Theresultsdemon—stratethatthecalculationsareagreeablewiththoseofthefiniteelementsoftware,arebasicallya—greeablewiththeprovisionsintheAA
8、SHTOandthereliabilityofthemethodhasbeenthereforeverified.Keywords:pi
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