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1、2,4straincapacity552.4应变能力55relationbetweenthedynamicmodulusofelasticity,determinedbytransversevibrationofcylinders,andtheircompressivestrength动态弹性模量之间的关系,由横向振动的汽缸、和他们的抗压强度确定itshouldalsobenotedthatnoinformationisavailableregardingtherelationshipbetweenthestaticanddyna
2、micmodulusofelasticityforconcretewithstrengthinexcessof8000psi同样应该注意到的是没有信息可以证明关于弹性模量对混凝土强度超过8000psi静态和动态之间的关系,2,4straincapacity2.4应变能力Theusablestraincapacityofconcretecanbemeasuredeitherincompressionorintension,无论在压缩或拉伸的状态下,混凝土可用应变能力可以测量inthecompressionmode,在压缩模式下,it
3、canbemeasuredbyeitherconcentricoreccentriccompressiontesting,应变能力可以通过同心或偏心压缩测试测量inthetensilemode,在拉伸模式下thebehaviorundermultiaxialstressstatesifoutsidethescopeofthischapter.在本章的范围之外的多轴向的应力状态下的行为andonlythebehaviorunderuniaxialstressconditionwillbediscussed.只在单轴应力状态将被讨论。
4、Stressbehaviorincompression压缩状态下的应力行为Thestress-strainbehaviorisdependentonanumberofparameterswhichincludematerialvariablessuchasaggregatetypeandtestingvariablessuchasageattesting,loadingrate,straingradientandothersnotedabove应力-应变行为是依赖于大量的参数,其中包括材料变量如骨料类型和测试变量如年龄测试,以及其
5、他人上面所提到的加载速率,应变梯度来测定。Theeffectoftheaggregatetypeofthestress-staincurveisshowninfig2.32whichindicatesthathigherstrengthandcorrespondingstrainareachievedforcrushedaggregatefromfine-graineddiabaseandlimestone,ascomparedtoconcretesmadefromsmoothrivergravelandfromcrushedgr
6、anitethatcontainedinclusionsofasoftmineral图32显示相对于由平滑河流砾石和碎花岗岩,含夹杂物的软矿物组成的混凝土,其总体效果类型的应力斑曲线表明碎骨料从细粒度的辉绿岩和灰岩可以达到更高的强度和相应的应变,Aunmberofinvestigationshavebeenundertakentoobtainthecompletestresscurvesincompression。上述饼状图已开展调查并获得完整的应力压缩曲线。Axialstress-strainCurvesforconcretew
7、ithcompressivestrengthupto14000psi(98mpa)concreteasobtainedbydifferentresearchersareshowninfig2.33图33显示的是由不同的研究人员测量得混凝土抗压强度高达14000psi(98mpa)混凝土的轴向应力-应变曲线Itisgenerallyrecognizedthatforconcreteofhigherstrength,摘要显示一般情况下,对于高强度的混凝土,theshapeoftheascendingpartofthecurvebeco
8、memorelinearandsteeper,提升部分的形状的曲线越线性越陡峭,thestrainatmaximumstressisslightlyhigher,其最大应力应变越高,andtheslopeofthedescendingpartbec