简介:Theearthquake-resistantpropertyofreinforcedconcretemembersdependsontheinteractionbetweenreinforcingbarsandsurroundingconcretethroughbondtoalargedegree.Inthispaperageneralsystemaimedatdealingwiththefailureanalysisofreinforcedconcretecolumnsstrengthenedwithcarbon-fiber-reinforcedplastic(CFRP)sheetsincludingbond-slipoftheanchoredreinforcingbarsatthefootofthecolumnsispresented.Itisbasedontheyielddesigntheorywithamixedmodelingofthestructure,accordingtowhichtheconcretematerialistreatedasaclassicaltwo-dimensionalcontinuum,whereasthelongitudinalreinforcingbarsareregardedasone-dimensionalrodsincludingbond-slipatthefootofthecolumns.InshearreinforcedzonesboththeshearCFRPsheetsandtransversereinforcingbarsareincorporatedintheanalysisthroughahomogenizationprocedureandtheyareonlyintension.Theapproachisthenimplementednumericallybymeansofthefinite-elementformulation.Thenumericalprocedureproducesaccurateestimatesfortheloading-carryingcapacityoftheshearmemberstakenasanillustrativeapplicationbycorrelationwiththeexperimentalresults,sotheproposedapproachisvalid.
简介:有非线性赔偿的一个高速度列平行CDS/ADC电路在这份报纸被建议。相关双采样(CDS)和analog-to-digital变换器(模数转换器)工作基于二漂浮门inverters和开关电容器网络集成于一个三阶段的列平行电路。传统的单个斜坡的模数转换器的变换率被划分量子化到粗糙的步和好步加快。一个存储电容器被用来存储粗糙的步的结果并且定位好步的斜面信号的节,它能从2n把钟步骤归结为2(n/2+1)。漂浮的门inverters被实现减少电源消费。它的导致的非线性的偏移量被把一个赔偿模块介绍给inverter的输入取消,它能在建议电路的三个阶段使相等联合路径。这个电路与640为互补金属氧化物半导体图象传感器被设计并且模仿,
简介:Theseismicperformanceoffourshortconcretecolumnswasinvestigatedunderlowcycleandrepeatedloads,includingthefailurecharacteristics,hystereticbehavior,rigiditydegeneracyandsteel-barstress.Theinfluencesofreinforcementstrength,stirrupratioandshearspanratiowerealsocompared.Testresultsrevealthattherestrictioneffectofstirrupscanimprovethepeakstress,sothebearingcapacityofspecimencanbeimproved;forthehigh-strengthshortconcretecolumnwithhigh-strengthstirrups,itwasmorereasonabletouseultimatedisplacementangletoreflecttheductilityofthespecimen,andtheyieldstrengthofhigh-strengthstirrupsshouldbedevaluedwhencalculatingthestirrupcharacteristicvalue;theseismicperformanceofshortcolumnwouldbeimprovedwiththeincreaseofvolume–stirrupratioandshearspanratio;thehigh-strengthstirrupsandhigh-strengthlongitudinalreinforcementsdidnotyieldwhentheloadactingonthespecimenreachedthepeakvalue,whichbroughtadequatesafetystocktotheseshortcolumns.
简介:【摘要】随着社会经济的发展和钢结构生产加工技术的进步,工业厂房工程中采用钢框排架结构形式的比例在逐渐上升,结合规范中相关的强连接弱构件的要求,柱与基础的连接计算成为设计的关键一环,杯口基础与外露式、包裹式、直埋式相比,对上部钢柱形式和截面更具适应性,便于满足上述抗震要求,且其施工能与上部结构的加工同步开展,有利于压缩工期和节省工程费用。目前杯口基础的设计理论有固端理论、撬杠理论及斜截面破坏理论,但规范对杯口基础的设计缺少明确的理论指导,本文综合现有文献及试验成果,梳理出一套钢柱杯口基础的设计思路和方法,供结构设计人员讨论参考。