波形钢腹板连续刚构桥的地震响应分析

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1、波形钢腹板连续刚构桥的地震响应分析张长青，安永日，安里鹏17文章编号：1003—4722(2011)03一O017一O5波形钢腹板连续刚构桥的地震响应分析张长青，安永日，安里鹏。(1．招商局重庆交通科研设计院有限公司，重庆400067；2．重庆交通大学土木工程学院，重庆400074)摘要：为研究波形钢腹板连续刚构桥地震响应特性，分别对主跨160m的PC及波形钢腹板连续刚构桥进行时程响应分析。采用MIDAS建立2种连续刚构桥模型，分析模型基本动力特性和在3种地震波作用下的地震响应。分析结果表明：波形钢腹板连续刚构桥振型贡献率无明显集中现象；地震波作用下，桥墩及主梁产生的

2、轴力和绕横桥向弯矩较PC连续刚构桥大，绕顺桥向弯矩较PC连续刚构桥小；主梁跨中节点位移顺、横桥向均较PC连续刚构桥大；加速度衰减速度，顺桥向较PC连续刚构桥小，横桥向较PC连续刚构桥大；在主梁截面设计中，仍以静力计算结果控制。关键词：连续刚构桥；波形钢腹板；动力特性；地震；内力；加速度中图分类号：U441文献标志码：AAnalysisofSeismicResponseofCorrugatedSteelWebContinuousRigid-_FrameBridgeZHANGChang-qing，ANYong—ri，ANLi—peng(1．ChinaMerchantsCh

3、ongqingTransportResearchandDesignInstituteCo．，Ltd．，Chongqing400067，China；2．SchoolofCivilEngineering，ChongqingJiaotongUniversity，Chongqing400074，China)Abstract：Toinvestigatetheseismicresponsecharacteristicofcorrugatedsteelweb(CSW)continuousrigid—framebridge，thetime—historyresponseanalysi

4、sofprestressedconcrete(PC)andCSWcontinuousrigid—framebridgeswithmainspans160mwasrespectivelymade．TheMI—DASwasusedtosetupthemodelsforthetwotypesofthebridges，thebasicdynamiccharacter—isticsandtheseismicresponsesofthemodelsundertheactionof3typesofseismicwaveswereanalyzed．Theresultsoftheana

5、lysisrevealthatthecontributionratioofvibrationmodesoftheCSWbridgedoesnotexhibitsignificantconcentration．Undertheactionoftheseismicwaves，theaxialforcesproducedinthepiersandmaingirderoftheCSWbridgeandthebendingmomenta—roundthetransversedirectionofthebridgearegreaterthanthoseofthePCbridge，

6、however，thebendingmomentaroundthelongitudinaldirectionislessthanthatofthePCbridge．Thedis—placementofthemidspannodeofthemaingirderoftheCSWbridgeinboththelongitudinalandtransversedirectionsisgreaterthanthatofthePCbridge．ThedecayingspeedofaccelerationoftheCSWbridgeinthelongitudinaldirectio

7、nislessthanthatofthePCbridgewhileinthetrans—versedirection，isgreaterthanthatofthePCbridge．Inthedesignofthecrosssectionofthemaingirder，theresultsofstaticcalculationshouldbestilltakenasthecontro1．Keywords：continuousrigid—framebridge；corrugatedstee1web；dynamicbehavior；seismici—ty；