简介：Inthisstudy,threerapidrepairtechniquesareproposedtoretrofitcircularbridgepiersthatareseverelydamagedbytheflexuralfailuremodeinmajorearthquakes.Thequasi-statictestsonthree1:2.5scaledcircularpierspecimensareconductedtoevaluatetheefficiencyoftheproposedrepairtechniques.Forthepurposeofrapidrepair,therepairprocedureforallthespecimensisconductedwithinfourdays,andthebehavioroftherepairedspecimensisevaluatedandcomparedwiththeoriginalones.Afiniteelementmodelisdevelopedtopredictthecyclicbehavioroftherepairedspecimensandthenumericalresultsarecomparedwiththetestdata.Itisfoundthatalltherepairedspecimensexhibitsimilarorlargerlateralstrengthanddeformationcapacitythantheoriginalones.Theinitiallateralstiffnessofalltherepairedspecimensislowerthanthatoftheoriginalones,whiletheyshowahigherlateralstiffnessatthelaterstageofthetest.Nonoticeabledifferenceisobservedfortheenergydissipationcapacitybetweentheoriginalandrepairedpierspecimens.Itissuggestedthattherepairtechniqueusingtheearly-strengthconcretejacketconfinedbycarbonfiberreinforcedpolymer(CFRP)sheetscanbeanoptimalmethodfortherapidrepairofseverelyearthquake-damagedcircularbridgepierswithflexuralfailuremode.

简介：Underharmonicwaveexcitation,thedynamicresponseofabilinearSDOFsystemcanbeexpressedbytheHilbertspectrum.TheHilbertspectrumcanbeformulatedby(1)theinter-wavecombinationmechanismbetweenthesteadyresponseandthetransientresponsewhenthesystembehaveslinearly,or(2)theintra-wavemodulationmechanismembeddedinoneintrinsicmodefunction(IMF)componentwhenthesystembehavesnonlinearly.ThetemporalvariationoftheinstantaneousfrequencyoftheIMFcomponentisconsistentwiththesystemnonlinearbehaviorofyieldingandunloading.Asathoroughstudyofthisfundamentalstructuraldynamicsproblem,thisarticleinvestigatestheinfluenceoftheamplitudeoftheharmonicwaveexcitationontheHilbertspectrumandtheintrinsicoscillatorymodeofthedynamicresponseofabilinearSDOFsystem.

简介：象lumped参数模型那样的分离模型和有限元素模型广泛地在地震的土壤扩大的解决方案被使用。然而，任何一个模型都精确地不估计土壤沉积物的自然频率，也不模仿一抑制频率独立。这研究基于模式等价方法为分层的土壤沉积物的一个维的粘弹性的反应分析开发一个新分离模型。新分离模型是一系列集中的群众，弹簧和缓冲筒与一种特殊配置描绘的一个一个维的相等的multi-degree-of-freedom(MDOF)系统。相等的MDOF系统的动态反应是导出的经分解，物理参数以形式的性质被提出。相等的MDOF系统与可得到的理论解决方案通过扩大函数的比较被验证。在相等的MDOF系统的自由(DOF)的度的适当数字被估计。有存在的相等的MDOF系统的比较研究分离模型被执行。建议相等的MDOF系统罐头确切介绍土壤存款抑制的自然频率和hysteretic并且向更精确的结果提供更少DOF，这被显示出。