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时间:2020-04-05
《大跨组合斜拉桥梁腹板及加劲肋合理设计.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2014年第44卷第5期(总第228期)BridgeConstruction,Vo1.44,No.5,2014(TotallyNo.228)1O3文章编号:1003—4722(2014)05—0103—05大跨组合斜拉桥梁腹板及加劲肋合理设计熊治华,刘永健,宋松林,冯云成(1.长安大学公路学院,陕西西安710075;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:为合理设置大跨组合斜拉桥钢板梁的腹板及其加劲肋,结合实例,在考虑后屈曲性能的影响下,对钢主梁受压区格长高比和加劲肋与腹板刚度比的合理选取进
2、行研究。采用有限元软件EBPLATE计算腹板正应力屈曲系数、剪切屈曲系数及抗剪承载力,分析屈曲系数与钢主梁受压区格长高比和加劲肋与腹板刚度比的关系。结果表明:统筹考虑受压区纵肋布置及横肋的间距,受压区格长高比建议设计值区间为2.0~2.5,在这个区间纵肋的有效宽度大,局部正应力屈曲系数较大且剪切屈曲系数处于中值;在受压区,加劲肋与腹板刚度比建议设计值区间取13.0~15.0,在腹板厚度适中的情况下,使腹板成为中度加劲板。关键词:斜拉桥;结合梁;腹板;加劲肋;后屈曲;受压区格长高比;加劲肋与腹板刚度比中图分类号:U448.27;
3、U448.216文献标志码:AProperDesignofWebandItsStiffenersforLongSpanCompositeGirderCable-StayedBridgeXIONGZhi—hua~,LIUYong-jian,SONGSong—lin,FENGYun-cheng(1.SchoolofHighway,ChanganUniversity,Xian710075,China;2.CCCCFirstHighwayConsultantsCo.,Ltd.,Xian710075,China)Abstract:Top
4、roperlyarrangethewebanditsstiffenersforthesteelplategirderoflongspancompositegirdercablestayedbridge,theproperselectionofthelength—to—heightratioandthestiffenerandwebstiffeningratioofthecompressivezonegridofthesteelmaingirderwasstudiedwithreferencetothepracticalexam
5、pleandinconsiderationoftheinfluenceofpost——bucklingper—-formance.ThefiniteelementsoftwareEBPLATEwasusedtocalculatethenormalstressbuck—lingcoefficient,shearbucklingcoefficientandtheshearcapacityoftheweb.Therelationshipbe—tweenthebucklingcoefficientsandthelength——to—h
6、eightratioandthestiffenerandwebstiffeningratioofthecompressivezonegridwasanalyzed.Theresultsofthestudyindicatethatinoverallconsiderationofthearrangementofthelongitudinalstiffenersandthespacingsofthetransversestiffenersinthecompressivezone,thedesignvalueintervalofthe
7、length—to—heightratioofthecompressivezonegridisproposedtobe2.0~2.5.Insuchinterval,theeffectivewidthofalongi—tudinalstiffenerisgreat。thevalueofthelocalnormalstressbucklingcoefficientisrathergreatandthevalueoftheshearbucklingcoefficientismedium.Forthestiffenerandwebst
8、iffeningra—tioofthecompressivezonegrid,thedesignvalueintervalisproposedtobe13.0~15.0.Undertheconditionthatthethicknessofthewebisproper,the
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