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时间:2020-03-27
《双曲面球型减隔震支座在刚构连续梁桥中的应用.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、第9卷第3期铁道科学与工程学报V0I.9NO.32012年6月JOURNALOFRAILWAYSCIENCEANDENGINEERINGJune2012双曲面球型减隔震支座在刚构连续梁桥中的应用刘俊。王合希(中铁第五勘察设计院集团有限公司桥梁设计院,北京102600)摘要:结合处于高烈度地震地区的某(48+4X80+48)m刚构连续梁桥的工程实例,分析表明对高烈度区的长联多跨刚构连续梁桥进行常规抗震设计往往无法达到抗震设防目标。应用双曲面球型减隔震支座进行减震设计,可以有效地降低抗震设计控制截面的内力,使结构设计更容易满足抗震规范的要
2、求。同时分析了双曲面球型减隔震支座的两个主要参数摩擦系数和球心距对刚构墩减震效果的影响。对于同一个球心距,刚构墩墩底的顺桥向弯矩响应、墩顶的顺桥向位移响应随摩擦因数的增大而减小,横桥向弯矩响应、横桥向位移响应随摩擦因数的增大而增大;对于同一个摩擦因数,随着球心距的增加,刚构墩墩底的顺桥向、横桥向弯矩响应以及墩顶的横桥向位移响应均呈现减小趋势,而刚构墩墩顶的顺桥向位移响应呈现先减小后增大的趋势。关键词:刚构连续梁桥;双曲面球型减隔震支座;减震设计;摩擦因数中图分类号:U24文献标志码:A文章编号:1672—7029(2012)03—0l
3、l7一o7Applicationofdoublesphericalseismicisolationbearinginarigidframe——continuousgirderbridgeLIUJun,WANGHe—xi(ChinaRailwayFifthSurveyandDesignInstituteGroupCo.,Ltd,Beijing102600,China)Abstract:Takinga(48+4x80+48)mrigidframe—continuousgirderbridgeinahighintensityearthqua
4、keareaasanexample,thelongmulti—spanrigidframe—continuousgirderbridgeunderconventionalseimicdesigncannotmeetwiththeseismicfortificationcriterion.ApplicationofthedoublesphericalseismicisolationbearingcaneffectivelyredueetheinternalforeeofthecontrollingsectionSOastomeetthe
5、requirementsofcodeforseismicdesign.Theefectofthetwomajorfactors,whicharefrictioncoefficientandcenterdistanceofthetwosphericalsurface,ontheresultofthebearingwasalsoanalyzed.Accordingtotheanalysis,atthesamecenterdistanceofthetwosphericalsurface,thelongitudinalbendingmomen
6、tatthebottomoftherigidframepierandthelongitudi—naldisplacementatthetopoftherigidframepierwerereducedwiththeincreaseoffrictioncoeficient,andthetransversebendingmomentatthebottomoftherigidframepierandthetransversedisplacementatthetopoftherigidframepierwereincreasedwiththe
7、increaseoffrictioncoefficient;Atthesamefrictioncoeficient,withtheincreaseofcenterdistanceofthetwosphericalsurface,thelongitudinalandtransversebendingmomentatthebottomoftherigidframepierandthetransversedisplacementatthetopoftherigidframepierweredecreased,andthelongitudin
8、aldisplacementatthetopoftherigidframepierexperiencedadecreaseatfirstshowedanandincreasetrendafterwards.Keyword
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