大跨度连续钢桁梁桥摩擦摆支座减隔震设计分析

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1、桥梁建设2015年第45卷第2期(总第231期)58BridgeConstruction，Vo1．45，No．2，2015(TotallyNo．231)文章编号：1003—4722(2015)02-0058—07大跨度连续钢桁梁桥摩擦摆支座减隔震设计分析王志英，张常勇(山东省交通规划设计院，山东济南250031)摘要：为改善大跨度连续钢桁粱桥的抗震性能，以(102+4×168+102)m的济南长清黄河大桥主桥为背景，结合其结构特点采用摩擦摆支座对该桥进行全桥隔震及连续墩隔震方案设计。采用通用有限元程序SAP2OO0建立该桥空间有限元模型，以3条人工地震波作为激励，采用

2、非线性时程分析方法对未隔震及应用摩擦摆支座隔震后的桥梁结构响应进行对比，结果表明：全桥隔震、连续墩隔震2种方案中摩擦摆支座均能起到良好的减隔震效果且满足设计要求。与全桥隔震方案相比，连续墩隔震方案中墩底弯矩和支座水平位移略大，但经济性更好，故综合考虑减隔震效果、经济性、支座尺寸等因素，推荐采用等效滑动半径为4m的摩擦摆支座连续墩隔震方案对该桥进行减隔震设计。关键词：桁架桥；连续梁桥；减隔震设计；摩擦摆支座；全桥隔震；连续墩隔震；有限元法中图分类号：U448．211；U442．55文献标志码：ADesignandAnalysisofFrictionPendulumBea

3、ringsforSeismicMitigationandIsolationofLongSpanContinuousSteelTrussGirderBridgeWANGZhi-ying，ZHANGChang。yong(ShandongProvincialTransportPlanningandDesignInstitute，Jinan250031，China)Abstract：Toimprovetheseismicperformanceoflongspancontinuoussteeltrussgirderbridge，themainbridgewithspanarra

4、ngement(102+4×168+102)moftheChangqingHuangheRiverBridgeinJinanwascitedasanexampleandinthelightofthestructuralfeaturesofthebridge，thefrictionPendulumbearingswereselectedforthedesignoftheschemesofwholebridgeseismicisolationandcontinuouspierseismicisolationforthebridge．Thespatialfiniteelem

5、entroodeIofthebridgewassetupbytheuniversalprogramSAP2000，themodelwasexcitedbythreeartificia1seismicwavesandthestructuralresponsesofthebridgethatwasnotseismicallyisolatedandthatwasseismicallyisolatedbythefrictionpendulumbearingswereanalyzedandcomparedbythenonlinearitvtime—historvanalysis

6、method．TheresultsoftheanalysisindicatethatthefrictionPendulumbearingsforboththeschemesofwholebridgeseismicisolationandcontinuousplersels—micisolationcanachievegoodeffectoftheseismicmitigationandisolationandcanmeetthedesignrequirements．Ascomparedtotheschemeofwholebridgeseismicisolation，t

7、hemoment0±thepierfootingsandthehorizonta1displacementofthebearingsintheschemeOcontinuouspiersels—micisolationareslightlygreat，buttheschemeiSmoreeconomic．Incomprehensiveconstderattonofsevera1factorsoftheseismicmitigationandisolationeffect，economyanddimensionso{thebearings，itisre