长周期斜拉桥纵向减震分析.pdf

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1、第33卷第2期土木工程与管理学报Vol_33No．22016年3月JournalofCivilEngineeringandManagementMar．2016长周期斜拉桥纵向减震分析代筠杰，代以义，刘志明，朱宏平(1．中国市政工程中南设计研究总院有限公司，湖北武汉430010；2．华中科技大学土木工程与力学学院，湖北武汉430074)摘要：对一白振周期长达11．56S的半漂浮体系斜拉桥建立了有限元模型，考虑桩土的共同作用和抗震盆式支座的摩擦耗能，进行结构自振特性和非线性地震响应时程分析，研究恒载内力对结构自振特性的影响，液体粘滞阻尼器参数和布置方案对斜拉桥地震响

2、应的影响，以及斜拉桥在长周期地震波激励下的响应特点。结果表明：恒载内力对结构基频有较大影响；在塔梁之间与梁墩之间均布置阻尼器结构减震效果更好；液体粘滞阻尼器参数对斜拉桥地震响应影响规律与常规半漂浮体系斜拉桥不同；相同地震波峰值加速度下，斜拉桥在长周期地震波和普通地震波激励下响应值可达数倍关系，设置阻尼器后斜拉桥结构减震效果良好。研究结果可供同类斜拉桥减震设计参考。关键词：长周期；半漂浮体系；斜拉桥；减震；液体粘滞阻尼器；地震波中图分类号：U442．55文献标识码：A文章编号：2095-0985(2016)02-0067-07AnalysisofLongitudi

3、nalSeismicReductionofLongPeriodCableStayedBridgeDAIYun-jie，DAIYi—yi，LIUZhi．ming，ZHUHong-ping(1．CentralandSouthernChinaMunicipalEngineeringDesignandResearchInstituteCoLtd，Wuhan430010，China；2．SchoolofCivilEngineeringandMechanics，HuazhongUniversityofScienceandTechnology，Wuhan430074，Chin

4、a)Abstract：Thefiniteelementmodelofasemifloatingcable—stayedbridgeofselfvibrationperiodupto11．56Sisestablished，whichconsidersboththefrictionenergydissipationofthepot-typeelastomericpadbearingandtheinteractionofpileandsoil．Thentheanalysisofthenaturalvibrationcharacteristicsandthenonlin

5、eartimehistoryanalysisofseismicresponseareconducted．TheinfluenceofeffectsofdeadloadonthenaturalvibrationcharacteristicsiSstudied．Theinfluenceofliquidviscousdamperparametersandlayoutonseismicresponseofthecable-stayedbridgeisalsostudied．Theresponsecharacteristicsofcable—stayedbridgeund

6、ertheexcitationoflongperiodseismicwavearealsostudied．Theresultsshowthattheeffectsofdeadloadhavegreaterinfluenceonthenaturalfrequency，thestructuraldampingeffectisbetterwhenthedampersareerectedbetweenthetowerandthebeamandbetweenthebeamandthepier，theinfluenceoftheliquidviscousdamperpara

7、metersonseismicresponseofthecable—stayedbridgeisdifferentfromthatofconventionalsemifloatingcable-stayedbridge，underthesamepeakgroundacceleration(PGA)，theresponsevaluesofthecable-stayedbridgeunderthelongperiodseismicwaveandordinaryseismicwaveexcitationcanreachuptodifferenceofseveralti

8、mes，thecable