基本信息
| 标准名称： | 立柄垂直安装铰链压紧器 |
| 中标分类： |
航空、航天 >>
航空器与航天器零部件 >>
机械配件、构件 |
| 发布日期： | 1996-09-13 |
| 实施日期： | 1997-01-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 1900-01-01 |
| 出版日期： | 1900-01-01 |
| 页数： | 5页 |
适用范围
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前言
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引用标准
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所属分类： 航空 航天 航空器与航天器零部件 机械配件 构件
【英文标准名称】:StandardTestMethodforCreepofConcreteinCompression
【原文标准名称】:受压中混凝土蠕变的标准试验方法
【标准号】:ASTMC512/C512M-2010
【标准状态】:现行
【国别】:
【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】:C09.61
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:压缩;混凝土;蠕变;蠕变应力;弹性应变
【英文主题词】:compression;concrete;creep;creepstrain;elasticstrain
【摘要】:Thistestmethodmeasurestheload-inducedtime-dependentcompressivestrainatselectedagesforconcreteunderanarbitrarysetofcontrolledenvironmentalconditions.Thistestmethodcanbeusedtocomparecreeppotentialsofdifferentconcretes.Aprocedureisavailable,usingthedevelopedequation(orgraphicalplot),forcalculatingstressfromstraindatawithinmassivenon-reinforcedconcretestructures.Formostspecificdesignapplications,thetestconditionssetforthhereinmustbemodifiedtomorecloselysimulatetheanticipatedcuring,thermal,exposure,andloadingageconditionsfortheprototypestructure.CurrenttheoriesandeffectsofmaterialandenvironmentalparametersarepresentedinACISP-9,SymposiumonCreepofConcrete.Intheabsenceofasatisfactoryhypothesisgoverningcreepphenomena,anumberofassumptionshavebeendevelopedthathavebeengenerallysubstantiatedbytestandexperience.Creepisproportionaltostressfrom0to40%ofconcretecompressivestrength.Creephasbeenconclusivelyshowntobedirectlyproportionaltopastecontentthroughouttherangeofpastecontentsnormallyusedinconcrete.Thus,thecreepcharacteristicsofconcretemixturescontainingaggregateofmaximumsizegreaterthan50mm[2in.]maybedeterminedfromthecreepcharacteristicsoftheminus50-mm[minus2-in.]fractionobtainedbywet-sieving.Multiplythevalueofthecharacteristicbytheratioofthecementpastecontent(proportionbyvolume)inthefullconcretemixturetothepastecontentofthesievedsample.Theuseofthelogarithmicexpression(Section8)doesnotimplythatthecreepstrain-timerelationshipisnecessarilyanexactlogarithmicfunction;however,fortheperiodofoneyear,theexpressionapproximatesnormalcreepbehaviorwithsufficientaccuracytomakepossiblethecalculationofparametersthatareusefulforthepurposeofcomparingconcretes.Therearenodatathatwouldsupporttheextrapolationoftheresultsofthistesttotensionortorsion.1.1Thistestmethodcoversthedeterminationofthecreepofmoldedconcretecylinderssubjectedtosustainedlongitudinalcompressiveload.Thistestmethodislimitedtoconcreteinwhichthemaximumaggregatesizedoesnotexceed50mm[2in.].1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q13
【国际标准分类号】:91_100_30
【页数】:5P.;A4
【正文语种】: