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时间:2020-03-25
《长联大跨连续钢桁梁桥减隔震设计研究.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32卷第8期2015年8月公路交通科技JournalofHighwayandTransportationResearchandDevelopmentV01.32No.8Aug.2015doi:10.3969/j.issn.1002~0268.2015.08.014长联大跨连续钢桁梁桥减隔震设计研究张常勇,王志英,王宏博(山东省交通规划设计院,山东济南250031)摘要:以某六跨连续钢桁梁桥为工程背景,基于有限元分析程序SAP2000,采用非线性时程分析方法,针对3种不同的减隔震装置对其减隔震设计方法进行分析研究,确定了适合该桥的减隔震设计方案及合理的减隔震装置设计参数。
2、结果表明:由于大桥上部结构质量过大,采用速度锁定器进行减震无法满足设计要求;采用黏滞液体阻尼器时,若固定支座约束不释放,由于固定墩对梁体的约束作用,难以得到满足要求的减隔震设计,需将固定支座纵向约束释放,才可通过参数分析得到合理的减隔震设计;采用摩擦摆支座进行全桥隔震时,容易得到合理的减隔震设计,且参数可选范围较大。通过各方案对比分析,摩擦摆支座减隔震方案总体减隔震效果更优,适用性更佳,对于本桥较为合理的设计参数为等效滑动半径R,。=4m,摩擦系数肛=0.03。关键词:桥梁工程;大跨度连续钢桁梁;非线性时程分析;减隔震设计;速度锁定器;黏滞液体阻尼器;摩擦摆支座中图分类号
3、:U441+.3,U448.27文献标识码:A文章编号:1002—0268(2015)08—0080—08StudyonSeismicMitigationandIsolationDesignforaLong‘spanContinuousSteelTrussBeamBridgeZHANGChang—yong,WANGZhi-ying,WANGHong—bo(ShandongProvincialCommunicationsPlanningandDesignInstitute,JinanShandong250031,China)Abstract:Ontheengineering
4、backgroundofa6-spancontinuoussteeltrussbridge,theseismicmitigationandisolationdesignmethodisinvestigatedbasedonfiniteelementanalysisprogramSAP2000usingnonlineartimehistorymethodfor3kindsofseismicisolationdevices,andtheseismicisolationdesignschemeaswellastherationaldesignparametersofthesei
5、smicisolationdevicessuitableforthebridgearedetermined.Theresultindicatesthat(1)itisdifficulttomatchthedesignrequirementbyusingspeedlock—updevicesbecauseofthehugemassofthebridgesuperstructure;(2)whenapplyingviscousliquiddamper,ifthefixedbearingremainsduringearthquake,thedesignrequirementis
6、alsohardtobesatisfiedbecauseoftherestraintoffixedbearingongirder,andsuitableseismicisolationdesigncanbeobtainedbyparameteranalysisifthelongitudinalrestraintisreleasedduringearthquake;(3)intheseismicisolationusingfrictionpendulumsystem(FPS),rationalisolationdesigncanbegainedeasilywithlarge
7、rangeofparameterstobechosen;(4)throughcomparisonamongallseismicisolationdesigneases,theeffectandapplicabilityoftheFPSseismicisolationdesignisthebest,andforthesubjectbridge,therationaldesignparametersoftheFPSare:equivalentslidingradiusis4m,andfrictioncoefficientis0.0
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