大跨人行异型斜拉桥静、动力及抗震性能分析

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1、桥梁建设2012年第42卷第4期(总第214期)BridgeConstruction，Vo1．42，No．4，2012(TotallyNo．214)45文章编号：1003—4722(2012)04—0045—06大跨人行异型斜拉桥静、动力及抗震性能分析刘世明，赵顺波，李晓克(华北水利水电学院土木与交通学院，河南郑州45001I)摘要：为研究异型斜拉桥结构安全，静、动力以及抗震性能是否满足规范要求，以某大跨人行异型斜拉桥为工程背景，采用MIDASCivil有限元分析软件，结合桥梁施工方法，对结构进行了考虑混凝土的收缩、徐变、

2、温度等作用的静力特性及动力特性、空气动力稳定以及抗震性能分析。结果表明：塔、梁各截面承载力均满足规范要求；结构基本周期比较短，能减少结构的地震位移，但对桥塔底部受力不利，主梁竖向弯曲的第1阶频率不符合规范(大于3Hz)要求，需要进行特殊设计，自振特性表现出明显的相互耦合的特点，随着频率的提高，结构扭转所占比重增大，对该桥的横向稳定不利；空气动力稳定良好；在E1地震作用下，结构的应力响应较小，结构刚度较大。关键词：斜拉桥；人行桥；有限元法；静力学；动力学；抗震中图分类号：U448．27；U448．11文献标志码：AAnaly

3、sisofStatic，DynamicandSeismicPerformanceofLongSpanIrregular-ShapePedestrianCable—StayedBridgeLIUShi—ming，ZHAOShun-bo，LjXiao-ke(SchoolofCivilEngineeringandTransp0rtation，NorthChinaInstituteofWaterResourcesandElectricPower，Zhengzhou450011，China)Abstract：Tostudythest

4、ructuralsafetyoflongspanirregular—shapepedestriancable-stayedbridgeandtocheckifthestatic，dynamicandseismicperformanceofthebridgecanmeettherele—vantrequirementsinthecodes，anactualpedestriancable—stayedbridgeofthesametypewasci—tedasanexample．Bymeansofthefiniteelemen

5、tanalysissoftwareMIDASCivilandwithrefer-eneetotheconstructionmethodstobeusedforthebridge，thestaticanddynamiccharacteristics，theaerodynamicstabilityandseismicperformanceofthestructurewereanalyzed，takingintoac—countoftheactionofconcreteshrinkage，creepandtemperatures

6、．Theresultsoftheanalysisin—dicatethatthebearingcapacityofvarioussectionsofthepylonandgirderofthestructurecanmeettherequirementsinthecodes，thebasicperiodofthestructureisshortandcanreducethedisplacementofthestructurecausedbyearthquake，butitisunfavorabletotheforcecon

7、ditionsofthepylonfooting．The1storderfrequencyofverticalbendingofthemaingirderdoesnotmeettherequirements(greaterthan3Hz)inthecodesandshouldbespeciallydealtwithinthede—sign．Thenaturalvibrationofthestructurepresentsobviousmutualcouplingcharacteristicandwiththeincreas

8、eoffrequency，theproportionofthestructuraltorsionwil1increaseandwillbeunfavorabletothelateralstability．Theaerodynamicstabilityofthestructureisgoodandunde