1、光面钢筋混凝土柱的地震响应的输人参数,尤其取决于 FRP 筋和混凝土之间的粘结性能.关键词:分析;局部变形模型;钢筋混凝土;FRP 筋;超静定梁;弯矩重分布临界荷载作用下通过有限元分析的桥寿命动力放大系数DeterminationofBridgeLifetimeDynamicAmplificationFactorUsingFiniteElementAnalysisofCriticalLoadingScenariosArturoGonz61ez,ParaicRattigan.EugeneJ.OBrienandColinCapranAbstract:Thedevelopmentofaccurate
2、codesforthedesignofbridgesandtheevaluationofexistingstructuresrequiresadequateassessmentofheavytrafficloadingandalsothedynamicinteractionthatmayoccurasthistraffictraversesthestructure.Currentapproachesgenerallyfirstcalculatethecharacteristicstaticloadeffectandthenapplyanamplificationfactortoallowfor
3、dynamics.Thisneglectsthesignificantlyreducedprobabilityofbothhighstaticloadingandhighdynamicamplificationoccurringsimultaneously.Thispaperpresentsanassessmentprocedurewherebyonlycriti?calloadingeventsareconsideredtoallowforanefficientandaccuratedeterminationofindependentvaluesforcharacteristic(1ifet
4、ime-maximum)staticandtotal(includingdynamicinteraction1loadeffects.Initiallythecriticalstaticloadingscenariosforachosenbridgearedeterminedfr0mMonteCarlosimulationusingweigh-inmotiondata.ThedevelopmentofacIatabaseof3.dimensionaIfiniteelementbridgeandtruckmodelsallowsfortheanalysisofthesevari.ouscombi
5、nationsofvehicularloadingpatterns.Theidentifiedcriticalloadingscenariosaremodelledandanalysedindi.viduallytoobtainthecriticaltotaIJoadeffect.Itisthenpos.sibletoobtainacorrelationbetweencriticaIstaticIoadeffectandcorrespondingtotalloadeffectandtoextrapolatetofindasite-specificdynamicamplificationfact
6、or.Keywords:Traffic;Dynamics;Finiteelementmodelling;Simulation;StatisticsEngineeringStructures,2008,3 口(9):2360.2369的静态荷载作用,然后加上一个放大系数作为动态作用的限值.这种方法明显减少了高静态荷载和高动态扩大作用同时发生的可能性.提出了一个评估程序,只考虑临界荷载,可以有效和精确地确定典型.静力(最大寿命) 和动力(包括动态交互作用) 荷载的特征值.采用蒙特卡罗模拟确定所选桥的临界静力荷载,建立三维有限元桥梁数据库和模型,对各种车辆荷载组合进行分析.建立识别临界荷载过程的模型
7、,分析得到临界总荷载作用.然后可以得到临界静力荷载作用与相应的总荷载作用的相关性,进而外推确定一个特定的动力扩大系数.关键词:交通;动力学;有限元模型;模拟;统计光面钢筋混凝土柱的地震响应第一部分:单调试验SeismicResponseofR.C.ColumnswithSmoothReinforcementPartI:MonotonicTestsGerardoMarioVerderame-GiovannFabbrocinoandGaetanoManfrediAbstract:RecentNationaIandIntemationalseismiccodesmarkthedifferencebe
8、tweenassessmentofexistingconstructionsanddesignofnewones.Therefore.specificguidelinesonthestructuralcharacterizationofmaterials-detailsaswellasonproperprocedurestoperformreliablestructuraIanalyseshavebeenreleased.Inthiscontext.seis.miccaIpacitymodelsforconcreteconstructionswithsmoothreinforcementpla
9、yakeyroleandneedfurtherdevelopment.Thepresentpaperreportstheoutcomeofanexperimentalprogramcarriedoutonreinforcedconcrete(R.C.)columnsdesignedaccordingtoobsoletecodesandpracticeswhichdatebackbetween1940sand1970s.ltfocusestheattentionontherotationcapacityofmembersundermonotonicIoad.ingandrepresentsthe
10、firstpertofanextendedresearchreportedintwocompaniondocumentsthatapproachtheprob.1emfr0mboththemonotonicaswellascyclicperspectiveKeywords:Reinforcedconcrete;Oldtypemembers;Smoothrebars;Monotonicbehaviour;RotationcapacityEngineeringStructures.2008.3 口(9):2277.2288摘要:建立桥梁设计和既有结构评估的精确标准要求需要充分评估重载交通荷载以及重
11、载作用导致摘要:最新国内和国际的抗震规范对既有建筑和的动态交互作用目前的方法一般是首先计算典型新设计结构抗震评估之间的差异进行了论述.发布SteelConstruction.2009(2),Vo1.24,No.11783国际期刊导读了材料结构特征的详细指南,以及完成可靠性分析的特有程序.光面钢筋混凝土结构的抗震性能模型具有重要作用,需要进一步完善.对钢筋混凝土柱的试验结果进行了报道,这些钢筋混凝土柱按照老规范设计,可追溯到 2O 世纪 407O 年代.研究聚焦在单调荷载下构件的转动能力以及对两个文献中拓展研究报告的第一部分进行描述,两个文献均对单调和循环问题进行研究.关键词:钢筋混凝土;既有构
12、件;光面钢筋;单调性;转动能力光面钢筋混凝土柱的地震响应第二部分:循环试验SeismicResponseofR.C.ReinforcementPartColumnswithSmoothII:CyclicTestsGerardoMarioVerderame.GiovannFabbrOcjnOandGaetanoManfrediAbstract:Evaluationofrotationcapacityofreinforcedconcrete(R.C.)membersisakeyissueintheseismicperformancesevaluationoftheexistingbuildings
13、.Intheframeworkofthemodernsafetyassessmentprocedures-acomparisonbetweenaseismicdemand(D)andseismiccapacity(C)measureisrequired.However,availablecapacitymodelsre-flectexperimentalresultsreDresentatiVeofnewconstructions,wheredeformedbarsareused.ConsequentIy.de?formationandstrengthmechanismsdonotnecess
14、arilyreflectresponseofold.typemembers.Itiswellknownthatr.c.membersdesignedaccordingtoobsoletecodesofprac?ticearecharacterisedbyverydifferentstructuraIdetailing.inadequateconfinement,poorbondbetweensmoothbarsandconcrete.sothatverydifferentpostyieldingmecha-nismscomparedtonewconstructionstakeplace.Thi
15、sisthebackgroundofthepresentpaperthatreportstheresultsofthesecondphaseoftheexperimentalprogramcarriedoutonreinforcedcolumnswithsmoothrebarsdesignedaccordingtoguidelinesavailableinItalybetween1940and1970.Resuitsonspecimenssubjectedtocyclicloadingclearlypointouttheroleofpoorbondinthedevelopmentofrotat
16、ioncapacity.Relevantaspectsoftheresearcharediscussedwithreferencetothemonotonicresponseofcolumnsanalysedinacompanionpaperandtochordrotationgivenbyempiricalformulae.i.e.Eurocode8provisions.Keywords:Reinforcedconcrete;Smoothreinforcement;OldtypeR.C.structures;Seismicbehaviour;RotationcapacityEngineeri
17、ngStructures.2008.30(9):2289.2300摘要:既有建筑的抗震性能评估中,钢筋混凝土构件的转动能力评估是一个关键问题.在现代安全评估体系中,必须进行抗震需求和抗震能力的比较.然而,可采用的性能模型只能反映允许钢筋变形的新结构的试验结果,其变形和强度机制并非必须反映旧构件的响应.众所周知,按照旧规范设计的钢筋混凝土构件,通过不同的结构细节,不完善的约束,光面钢筋和混凝土之间弱的粘结来描绘其特性.与新结构相比,出现了不同的屈服后机制.根据意大利 19401970 年的指南设计了光面钢筋混凝土柱,并报道其第二阶段试验结果.在循环荷载下,对构件的研究结果清楚地显示了在转动能力发
18、展过程中弱粘结的作用.相关的研究涉及柱的单调响应和由欧洲规范 8 规定的经验公式所确定的弦的转动.关键词:钢筋混凝土;光面钢筋;老钢筋混凝土结构;抗震性能 j 转动能力桁架尺寸,几何形状和拓扑优化的力法和遗传算法Sizing,GeometryandTopologyOptimizationofTrussesviaForceMethodandGeneticAlgorithmH.Rahami.A.KavehandY.GholipourAbstract:Inthisarticle-acombinationofenergyandforcemethodisusedforminimizingtheweigh
19、tofthetrussstructures.Geneticalgorithmisemployedasanoptimizationtoolforthispurpose.Themainideaproposedinhereisthemannerinwhichtheinputvariablesarereduced.UsingtheforcemethodisofaconsiderablehelpinhandlingGAforthestructuraIoptimization.Inthepresentmethod.thereisnoneedtofindtheinverseofmatrices.andont
20、yaIimitednumberofvariablesareaddedtoGA.whichisequaltothedegreeofstaticindeterminacyofthestructure.Theefficiencyofthepresentapproachisillustratedthroughseveralexampiesfordifferenttypesofoptimization.andtheresultsarecomparedtothoseofdifferentoptimizationtechniques.Keywords:Forcemethod;Geneticalgorithm;Topologyopti-mization;Strainenergy;Complementarystrainenergy;TruIsses84 钢结构 2009 年第 2 期第 24 卷总第 117 期
