基于随机地震响应的斜拉桥粘滞阻尼器参数优化.pdf

《基于随机地震响应的斜拉桥粘滞阻尼器参数优化.pdf》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

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）１７文章编号：１００３－４７２２（２０１６）０３－００１７－０６基于随机地震响应的斜拉桥粘滞阻尼器参数优化王波，马长飞，刘鹏飞，汪正兴（１．中铁大桥科学研究院有限公司，湖北武汉４３００３４；２．桥梁结构健康与安全国家重点实验室，湖北武汉４３００３４）摘要：针对现有阻尼器参数优化方法的缺陷，基于斜拉桥的随机地震响应，提出一种粘滞阻尼器参数优化的方法。该方法利用虚拟激励法计算

2、在一系列样本点处结构的地震响应，根据响应面法拟合结构地震响应关于粘滞阻尼器参数的函数表达式，最终以粘滞阻尼器的阻尼力最小为目标函数、阻尼器相对位移及桥塔塔底弯矩小于规定的限值为约束条件，采用非线性规划法计算粘滞阻尼器参数优化值。以某半飘浮双塔混合梁斜拉桥为例，对其粘滞阻尼器的参数进行优化，结果表明：该方法避免了单纯依靠经验选取阻尼器参数所带来的不确定性；通过考虑地震动的随机性，使优化结果具有较强的适用性；在构造响应面函数时采用高次多项式表达式，提高了计算结果的精度。关键词：斜拉桥；粘滞阻尼器；参数优化；虚拟激励法；响

3、应面法；非线性规划；随机振动中图分类号：U４４１．３；O３２４文献标志码：AParameterOptimizationofViscousDamperforCable‐StayedBridgeBasedonStochasticSeismicResponsesWANGBo，MAChangfei，LIUPengfei，WANGZhe‐ngxing‐（１．ChinaRailwayBridgeScienceResearchInstitute，Ltd．，Wuhan４３００３４，China；２．StateKeyLaboratory

4、forHealthandSafetyofBridgeStructures，Wuhan４３００３４，China）Abstract：Inthelightofthedeficienciesoftheexistingparameteroptimizationmethodsfortheviscousdamper，anewparameteroptimizationmethodforthedamperwasproposedbasedonthestochasticseismicresponsesofacable‐stayedbrid

5、ge．Inthenewmethod，thepseudoexcitationmethodwasusedtocalculatethestructuralseismicresponsesataseriesofthesamplepoints．Thefunctionexpressionfortheparametersofthedamperinrelationtothestructuralseismicresponseswasfittedaccordingtotheresponsesurfacemethodandtheparam

6、eteroptimizationvaluesofthedamperwerecalculatedbythenonlinearprogrammingmethodbywayoftakingthedampingforceofthedamperthatwasminimalasthetargetfunctionandtherelativedriftofthedamperandthemomentinthepylonfootingthatwerelessthanthespecifiedlimitvaluesastheconstrai

7、ntcondi‐tions．Asemi‐floatingsystemhybridgirdercable‐stayedbridgewithdoublepylonswasselectedasanexampleandtheparametersofthedamperwereoptimizedbythenewmethod．Theresultsdem‐onstratethatthenewmethodcanavoidtheuncertaintyduetothedeterminationoftheparametersofthevis

8、cousdamperthatsimplyreliesontheexperiencesandtheconsiderationofthestochasticnatureofthegroundmotioncanmakegoodadaptabilityoftheoptimizationresults．Increatingtheresponsesurfa