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1、維普資訊http://www.cqvip.com第40卷第1期土木工程學(xué)報Vo1.40No.12007年1月CH鞏ACI、ⅧLENG礬EEf咖NGJOURNALJan.2007城市隔震高架橋梁地震反應(yīng)的半主動控制李忠獻岳福青周莉(天津大學(xué),天津300072)摘要:研究應(yīng)用磁流變(MR)阻尼器對隔震連續(xù)梁橋鄰聯(lián)相對位移的半主動控制,并采用離線優(yōu)化與在線自調(diào)整相結(jié)合進行模糊控制(FLC)。以鄰聯(lián)最大相對位移最小化為目標函數(shù),對基本模糊控制器的隸屬函數(shù)、量化因子、比例因子進行離線遺傳優(yōu)化;對優(yōu)化后的模糊控制器的量化因子和比例因子進行在線自調(diào)整;數(shù)值仿真分析一多跨隔震連續(xù)梁橋的簡化四自由度體系的半主
2、動控制,比較不同控制方案的控制效果。結(jié)果表明,將MR阻尼器安裝在上部結(jié)構(gòu)與橋墩之間對橋梁鄰聯(lián)相對位移的控制效果優(yōu)于將其安裝在鄰聯(lián)之間;半主動控制能同時有效控制鄰聯(lián)最大相對位移與支座變形;與普通模糊控制以及僅采用遺傳優(yōu)化的模糊控制相比,具有在線自調(diào)整功能的模糊控制具有更好的控制效果和魯棒性。關(guān)鍵詞:城市高架橋梁;地震反應(yīng);隔震;半主動控制;磁流變(MR)阻尼器;模糊控制(FLC);遺傳算法;自調(diào)整中圖分類號:TU201文獻標識碼:A文章編號:1000—131X(2007)01—0042—07mi-activecontrolonseismicresponsesofvibration-insula
3、tedurbanelevatedbridgesLiZhongxianYueFuqingZhouLi(TianjinUniversity,Tianjin300072,China)Abstract:Semi—activecontrolviamagnetrheologic(MR)dampersforcontroloftherelativedisplacementbetweenadjacentsegmentsofaseismicisolatedcontinuousgirderbridgeisinvestigated,andfuzzylogiccontrol(FLC)isperformedbycomb
4、ingoflineoptimizationandonlineself-tuning.Takingtherelativedisplacementbetweenadjacentsegmentsastheobjectivefunctiontobeminimized,themembershipfunction,thequantificationfactorandthescalingfactorofbasicFLCareoflineoptimizedbyusingageneticalgorithm(GA).Thequantificationandscalingfactorsoftheoptimized
5、FLCareself-tunedonline.Thesemi—activecontrolforasimplifiedfourdegreesoffreedomsystemofanisolatedmulti—spancontinuousgirderbridgeisnumericallysimulated,andthecontroleffectsfordifferentcontrolstrategiesarecompared.TheresultsindicatethatthecontroleffectofinstallingMRdampersbetweensuperstructureandpier
6、sontherelativedisplacementbetweenadjacentsegmentsofbridgeissuperiortothatofinstallingMRdampersbetweenadjacentsegments.Relativedisplacementandbearingdeformationmaybeeffectivelydecreasedbyemployingthesemi—activecontrolstrategy.ComparingwiththeconventionalFLCandtheFLCoptimizedbyGAonly,theFLCwithonline
7、self-tuningperformancehasbettercontroleffectandrobustness.Keywords:urbanelevatedbridge;seismicresponse;seismicisolation;semi—activecontrol;magnetorheological(MR)damper;fuzzylogiccontrol(FLC);geneticalgorith