大跨度部分地锚式斜拉桥抗风稳定性参数研究.pdf

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1、桥梁建设２０１６年第４６卷第３期（总第２３８期）BridgeConstruction，Vol．４６，No．３，２０１６（TotallyNo．２３８）２３文章编号：１００３－４７２２（２０１６）０３－００２３－０６大跨度部分地锚式斜拉桥抗风稳定性参数研究张新军，姚美（浙江工业大学建筑工程学院，浙江杭州３１００１４）摘要：为了解大跨度部分地锚式斜拉桥的抗风性能，以一座主跨１４００m的部分地锚式斜拉桥方案为背景，采用大跨度桥梁三维非线性抗风稳定性分析方法，将地锚段主梁长度、辅助墩数量、主梁宽度和高度及桥塔高跨比等影响因素对结构自振频率、颤振临界风速和跨中处主梁位

2、移的影响进行分析。结果表明：增大地锚段主梁长度、边跨设置辅助墩有利于提高结构自振频率和颤振临界风速，减小跨中处主梁位移，但地锚段主梁长度和辅助墩数量存在最优合理值；增加主梁宽度可以有效提高结构自振频率和颤振临界风速，减小跨中处主梁位移；增加主梁高度可以有效提高结构的颤振临界风速，但对自振频率和跨中处主梁位移影响不大；增加桥塔高度可以有效提高结构自振频率和颤振临界风速，减小跨中处主梁位移。关键词：部分地锚式斜拉桥；抗风稳定性；影响因素；自振频率；颤振临界风速；主梁位移中图分类号：U４４８．２７；U４４２．５９文献标志码：AParametricStudyofW

3、indStabilityofLongSpanPartiallyGround‐AnchoredCable‐StayedBridgesZHANGXinjun，YAOMei‐（CollegeofCivilEngineeringandArchitecture，ZhejiangUniversityofTechnology，Hangzhou３１００１４，China）Abstract：Toinvestigatethewindperformanceofthelongspanpartiallyground‐anchoredca‐ble‐stayedbridges，aprop

4、osedpartiallyground‐anchoredcable‐stayedbridgewithamainspanof１４００mwascitedasanexampleandtheeffectoftheinfluentialfactors，suchasthemaingirderlengthoftheground‐anchoredsection，thenumbersoftheauxiliarypiers，themaingirderwidthanddepthandthepylonheight‐to‐spanratios，onthestructuralnatu

5、ralvibrationfrequencies，flut‐tercriticalwindspeedsandthemaingirderdisplacementatthemidspanwasanalyzed，usingthethree‐dimensionalnonlinearwindstabilityanalysismethodoflongspanbridges．Theresultsoftheanalysisrevealthattheincreaseofthemaingirderlengthoftheground‐anchoredsectionandthear

6、rangementoftheauxiliarypiersinthesidespansarehelpfultoimprovethestructuralnaturalvi‐brationfrequenciesandthefluttercriticalwindspeedsandreducethemaingirderdisplacementatthemidspan．However，theoptimalvaluesofthemaingirderlengthandthenumbersoftheauxil‐iarypiersremaintobedetermined．Th

7、eincreaseofthemaingirderwidthcaneffectivelyimprovethestructuralnaturalvibrationfrequenciesandthefluttercriticalwindspeedsandcanreducethemaingirderdisplacementatthemidspan．Theincreaseofthemaingirderdepthcaneffectivelyim‐provethestructuralfluttercriticalwindspeeds，however，theeffecto

8、ftheincreaseofthemaingirderdeptho