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【英文标准名称】:StandardTestMethodforFlexuralPerformanceofFiber-ReinforcedConcrete(UsingBeamWithThird-PointLoading)
【原文标准名称】:纤维增强混凝土的弯曲性能的标准试验方法(使用三点负荷简支梁)
【标准号】:ASTMC1609/C1609M-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:C09.42
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:fiber-reinforcedconcrete;first-peakstrength;flexuraltoughness;peakstrength;residualload;residualstrength;Beamtest;Concrete;Concrete(fiber-reinforced);Flexuraltesting
【摘要】:Thefirst-peakstrengthcharacterizestheflexuralbehaviorofthefiber-reinforcedconcreteuptotheonsetofcracking,whileresidualstrengthsatspecifieddeflectionscharacterizetheresidualcapacityaftercracking.Specimentoughnessisameasureoftheenergyabsorptioncapacityofthetestspecimen.Theappropriatenessofeachparameterdependsonthenatureoftheproposedapplicationandthelevelofacceptablecrackinganddeflectionserviceability.Fiber-reinforcedconcreteisinfluencedindifferentwaysbytheamountandtypeoffibersintheconcrete.Insomecases,fibersmayincreasetheresidualloadandtoughnesscapacityatspecifieddeflectionswhileproducingafirst-peakstrengthequaltooronlyslightlygreaterthantheflexuralstrengthoftheconcretewithoutfibers.Inothercases,fibersmaysignificantlyincreasethefirst-peakandpeakstrengthswhileaffectingarelativelysmallincreaseinresidualloadcapacityandspecimentoughnessatspecifieddeflections.Thefirst-peakstrength,peakstrength,andresidualstrengthsdeterminedbythistestmethodreflectthebehavioroffiber-reinforcedconcreteunderstaticflexuralloading.Theabsolutevaluesofenergyabsorptionobtainedinthistestareoflittledirectrelevancetotheperformanceoffiber-reinforcedconcretestructuressincetheydependdirectlyonthesizeandshapeofthespecimenandtheloadingarrangement.Theresultsofthistestmethodmaybeusedforcomparingtheperformanceofvariousfiber-reinforcedconcretemixturesorinresearchanddevelopmentwork.Theymayalsobeusedtomonitorconcretequality,toverifycompliancewithconstructionspecifications,obtainflexuralstrengthdataonfiber-reinforcedconcretememberssubjecttopurebending,ortoevaluatethequalityofconcreteinservice.Theresultsofthisstandardtestmethodaredependentonthesizeofthespecimen.Note58212;Theresultsobtainedusingonesizemoldedspecimenmaynotcorrespondtotheperformanceoflargerorsmallermoldedspecimens,concreteinlargestructuralunits,orspecimenssawnfromsuchunits.Thisdifferencemayoccurbecausethedegreeofpreferentialfiberalignmentbecomesmorepronouncedinmoldedspecimenscontainingfibersthatarerelativelylongcomparedwiththecross-sectionaldimensionsofthemold.Moreover,structuralmembersofsignificantlydifferentthicknessexperiencedifferentmaximumcrackwidthsforagivenmid-spandeflectionwiththeresultthatfibersundergodifferentdegreesofpull-outandextension.1.1Thistestmethodevaluatestheflexuralperformanceoffiber-reinforcedconcreteusingparametersderivedfromtheload-deflectioncurveobtainedbytestingasimplysupportedbeamunderthird-pointloadingusingaclosed-loop,servo-controlledtestingsystem.1.2Thistestmethodprovidesforthedeterminationoffirst-peakandpeakloadsandthecorrespondingstressescalculatedbyinsertingthemintheformulaformodulusofrupturegiveninEq1.Italsorequiresdeterminationofresidualloadsatspecifieddeflections,thecorrespondingresidualstrengthscalculatedbyinsertingthemintheformulaformodulusofrupturegiveninEq1(seeNote1).Itprovidesfordeterminationofspecimentoughnessbasedontheareaundertheload-deflectioncurveuptoaprescribeddeflection(seeNote2)andthecorrespondingequivalentflexuralstrengthratio.Note18212;Residualstrengthisnotatruestressbutanengineeringstresscomputedusingsimpleengineeringbendingtheoryforlinearelasticmaterialsandgross(uncracked)sectionproperties.Note28212;Specimentoughnessexpressedintermsoftheareaundertheload-deflectioncurveisan......
【中国标准分类号】:Q23
【国际标准分类号】:91_100_40
【页数】:9P.;A4
【正文语种】:英语


【英文标准名称】:Touchandclosefasteners-Determinationoflongitudinalshearstrength;GermanversionEN13780:2003
【原文标准名称】:粘接拉链.纵向剪切强度测定
【标准号】:EN13780-2003
【标准状态】:现行
【国别】:
【发布日期】:2003-05
【实施或试行日期】:
【发布单位】:欧洲标准学会(EN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:闭塞物;剪切试验;剪切强度;纺织品;材料强度;VELCRO带;分离强度;带材;规程;试验设备;窄条带材;布;分离;纺织材料;测定;定义;试验装置;试验;方法;服饰;数学计算;紧固件
【英文主题词】:Closures;Cloth;Clothing;Definition;Definitions;Determination;Fasteners;Mathematicalcalculations;Methods;Procedures;Separatingstrength;Separation;Shearstrength;Sheartesting;Strengthofmaterials;Strips;Tape;Testequipment;Testing;Testingdevices;Textile;Textiles;Velcrotapes
【摘要】:
【中国标准分类号】:Y89
【国际标准分类号】:61_040
【页数】:10P.;A4
【正文语种】:英语