斜拉桥粘滞阻尼器设计方案及参数回归分析.pdf

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1、桥梁建设2014年第44卷第5期(总第228期)BridgeConstruction，Vo1．44，No．5，2014(TotallyNo．228)21文章编号：1003—4722(2014)05—0021—06斜拉桥粘滞阻尼器设计方案及参数回归分析巫生平，张超，房贞政(福州大学土木工程学院，福建福州350108)摘要：为优化粘滞阻尼器对双塔斜拉桥的减震效果，以淮安大桥(主跨为416m的双塔斜拉桥)为背景进行研究。采用有限元软件SAP2000建立全桥三维有限元模型，应用非线性动力时程方法对比分析了4种不同阻尼器布设方案(分别将粘滞阻尼器布设在塔支座、桥台、边墩和桥台、边墩

2、位置)的减震效果。选择最优方案进行阻尼参数分析，应用最小二乘回归分析法建立关键截面参数与阻尼参数之间的数学模型，以控制截面内力和变形最小为原则，通过求解拟合方程的极值得到最优设计参数。结果表明：在桥台位置安装粘滞阻尼器能使其更好地发挥减震功能，且不改变辅助墩的受力；所提出的阻尼参数优化设计方法能有效地计算出最优阻尼参数，为设计提供方便。关键词：斜拉桥；减震；粘滞阻尼器；布设方案；阻尼参数；回归分析；有限元法中图分类号：U448．27；U442．55文献标志码：ADesignSchemesandParameterRegressionAnalysisofViscousDamp

3、ersforCable-StayedBridgeUSheng—ping，ZHANGChao，FANGZhen—zheng(SchoolofCivilEngineering，FuzhouUniversity，Fuzhou350108，China)Abstract：Tooptimizethedampingeffectoftheviscousdampersusedfordouble—pyloncable—stayedbridge，theHuaianBridge(adouble—pyloncable—stayedbridgewithamainspanof416m)wascited

4、asanexampleforstudy．ThesoftwareSAP2000wasusedtoestablishthethree—di—mensionalfiniteelementmodelforthewholebridgeofthebridgeandthedampingeffectof4dif—ferentlayoutschemesoftheviscousdampers(thedampersweretoberespectivelylaidoutatthelocationsofthepylonbearings，abutment，sidepierplusabutmentan

5、dsidepier)wascompara-tivelyanalyzedbythenonlineardynamictime—historymethod．Theoptimallayoutschemewaschosenandtheparametersoftheviscousdamperswereanalyzed．Bytheleastsquareregressionanalysismethod，themathematicalmodelfortheparametersofthecriticalsectionsandthedamp—erswascreatedandontheprinc

6、ipleofcontrollingtheinternalforcesanddeformationofthesee—tionstotheminimum，theoptimaldesignparameterswereobtainedthroughsolvingtheextremevaluesofthefittingequations．Theresultsofthestudyshowthattheschemeofinstallingtheviscousdampersattheabutmentofthebridgecanresultinbetterdampingfunctionof

7、thedamp—ersandwillnotchangethestressoftheauxiliarypiers．Theproposedoptimaldesignmethodfortheparametersofthedamperscanbeusedtoeffectivelycalculatetheoptimalparametersofthedampersandwillhenceprovideconvenienceforthedesign．Keywords：cable—stayedbridge；damping；viscousdam