基于行波效应的钢管混凝土拱桥地震反应分析

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1、基于行波效应的钢管混凝土拱桥地震反应分析胡志明，李精英，黄天一25文章编号：1003—4722(2010)O1—0025—04基于行波效应的钢管混凝土拱桥地震反应分析胡志明，李精英，黄天一。(1．江苏省地质工程勘察院，江苏南京210012；2．南京工业大学地质工程研究所，江苏南京210009)摘要：基于多点激励的运动方程，在考虑行波效应的前提下，应用有限元软件ABAQUS，对某下承式钢管混凝土拱桥(倾斜拱肋、倾斜吊杆)建立全桥模型，进行自振特性及地震反应分析。由2～4阶振型表明，桥面梁系刚度大于拱

2、肋刚度；由6阶以后振型表明，桥面外刚度大于面内刚度，在低频区主要是面内振动为主。由地震反应分析结果表明：行波效应使钢管混凝土拱桥结构内力有不同程度的增大，拱脚轴力比弯矩增幅更大，增幅与加速度峰值无正比关系，当超过临界波速后拱脚弯矩增幅开始反弹。临界波速与结构动力特性、地震波频谱特征等因素有关。另外，行波效应对拱桥控制截面位移影响比较复杂。关键词：拱桥；钢管混凝土结构；行波效应；自振特性；地震反应分析；有限元法中图分类号：U448．22文献标志码：ASeismicResponseAnalysisof

3、Concrete‘_FilledSteelTubeArchBridgeBasedonTravelingWaveEffectHUZhi—ming，LIJing—ying，HUANGTian—yi。(1．JiangsuProvincialGeo—EngineeringInvestigationInstitute，Naming210012，China；2．InstituteofGeologicalEngineering，NanjingUniversityofTechnology，Nanjing21000

4、9，China)Abstract：Onthebasisofthemotionequationsofmulti—supportexcitationandunderthepre—requisitethatthetravelingwaveeffectiStakenintoaccount，thefiniteelementsoftwareABAQUSisusedtoestablishthemodelofthewholebridgeofaconcrete—filledsteeltube(CFST)throug

5、harchbridgewithinclinedarchribsandinclinedhangersandtherelevantnaturalvibrationcharacteristicsandseismicresponseareanalyzed．The2ndtothe4thmodesshowthattherigidityofthebridgedeckisgreaterthanthatofthearchribs．Themodesafterthe6thmodeshowthattheout—-of-p

6、lanerigidityofthedeckisgreaterthanthein—-planerigidityandinthelow·-frequencyarea，thein—planevibrationisdominant．Theanalysisoftheseismicresponsedemon—stratesthatitisthetravelingeffectthatcausestheincreaseofthestructuralinternalforceoftheCFSTbridgeindif

7、ferentdegrees，theincreasingamplitudeofaxialforceofthearchspringisevengreaterthanthatofthebendingmoment，theamplitudehasnodirectproportionrelationwiththepeakacceleration．Whenexceedingthecriticalwavespeed，theamplitudeofthearchspringstartstorebound．Thecri

8、ticalwavespeedisrelatedtothefactorsofthestructuraldynamicbehaviorandseismicwavefrequencyspectrumandmoreovertheinfluencesofthetravelingwaveeffectonthedisplacementofthecontrolledsectionsofthearchbridgearecomplicated．Keywords：archbridge；concrete—