三门峡黄河公铁两用大桥主桥减隔震设计

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1、桥梁建设2014年第44卷第2期(总第225期)BridgeConstruction，Vo1．44，No．2，2014(TotallyNo．225)91文章编号：1003—4722(2014)02—0091—05三门峡黄河公铁两用大桥主桥减隔震设计刘俊锋，阮怀圣，宁伯伟(中铁大桥勘测设计院集团有限公司，湖北武汉430056)摘要：三门峡黄河公铁两用大桥主桥采用(84+9×1O8+84)m连续钢桁结合梁结构，主梁恒载1030kN／m，墩高60～72m，桥址区水平地震动峰值加速度为0．18g，场地类别为Ⅲ类。为了达到抗震设防目标，主墩墩顶采用双曲面球型减隔震支座，支座球心距7m，摩擦系数0．03

2、。采用MIDASCivil软件建立全桥有限元模型进行地震动力分析，并根据分析结果进行桥墩与基础验算。验算结果表明：在设计地震作用下，主体结构均保持在弹性工作范围内；在罕遇地震作用下，墩底可能进入塑性屈服阶段，墩柱按延性构件设计。根据地震动力分析结果和桥墩、基础验算结果，确定双曲面支座抗剪栓水平承载力按1．4倍的多遇地震响应值设计。关键词：铁路公路两用桥；结合梁；钢桁梁；双曲面球型减隔震支座；减隔震设计；延性设计；抗震设计中图分类号：U448．121；U442．55文献标志码：ASeismicMitigationandIsolationDesignofMainBridgeofSanmenxia

3、HuangheRiverRail·。cam。-RoadBridgeLIUJun—feng，RUANHuai—sheng，NINGBo—wei(ChinaRailwayMajorBridgeReconnaissance＆DesignGroupCo．，Ltd．，Wuhan430056，China)Abstract：ThemainbridgeofSanmenxiaHuangheRiverRail—cum—RoadBridgeisacontinu—OUScompositesteeltrussgirderstructurewithspanarrangement(84+9×108+84)m．Thedea

4、dloadofthemaingirderofthebridgeis1030kN／mandthepierheightis60～72m．Thehorizon—talgroundmotionpeakaccelerationinthebridgesiteareais0．18gandthesitetypeisofClassIII．Toattainthegoaloftheseismicfortification，thehyperbolicsphericalseismicmitigationandisolationbearingswerearrangedatthetopsofthemainpiers．Th

5、espacingdistancefromspheri—calcentertosphericalcenterofthebearingsis7mandthefrictioncoefficientis0．03．Inthede—sign，thesoftwareMIDASCivilwasusedtosetupthefiniteelementmodelforthewholebridge，tocarryouttheanalysisoftheseismicdynamicandaccordingtotheanalysis，thecheckingcalcu—lationofthepiersandfoundati

6、onswasmade．Theresultsofthecheckingcalculationshowthatunderthedesignedseismicaction，themainstructureofthebridgeworksintheelasticrangewhileundertherareseismicaction，thepierfootingsmaycometotheplasticyieldstageandthepiercolumnsshouldbedesignedastheductilecomponents．Basedontheanalysisoftheseismicdynami

7、candthecheckingcalculationofthepiersandfoundations，itisdeterminedthatthehori—zontalbearingcapacityoftheshearstudsofthehyperbolicsphericalbearingsshouldbedesignedintermsof1．4timesofthefrequentseismicresponse