【英文标准名称】:Methodoftestfordryingshrinkagecrackingofrestrictedconcrete
【原文标准名称】:约束裂缝混凝土的干燥收断裂缝的试验方法
【标准号】:JISA1151-2002
【标准状态】:作废
【国别】:日本
【发布日期】:2002-05-27
【实施或试行日期】:
【发布单位】:日本工业标准调查会(JP-JISC)
【起草单位】:TechnicalCommitteeonCivilEngineering
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:この規格は,外部拘東を行ったコンクリートの乾燥収縮ひび割れ発生日数を把握する試験方法について規定する。備考この規格は,普通骨材を用い,標準養生を行った場合の材齢28日の圧縮強度が45N/mm以下となるコンクリートに適用する。ただし,これ以外のコンクリートに適用する場合は,ひび割れ発生日数の評価に注意を要する。
【中国标准分类号】:Q14
【国际标准分类号】:91_100_30
【页数】:18P;A4
【正文语种】:日语


【英文标准名称】:StandardTestMethodsforStressRelaxationTestsforMaterialsandStructures
【原文标准名称】:材料和结构件应力松弛的标准试验方法
【标准号】:ASTME328-2002(2008)
【标准状态】:现行
【国别】:美国
【发布日期】:2002
【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】:E28.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:bendingrelaxation;bolting;compressionrelaxation;hoopstresses;riveting;springs;stressrelaxation;tensionrelaxation;torsionrelaxation;Bendingrelaxation;Castings;Compressiontesting--metallicmaterials;Elongation--metallicmaterials;
【摘要】:Relaxationtestdataarenecessarywhendesigningmostmechanicallyfastenedjointstoassurethepermanenttightnessofboltedorrivetedassemblies,pressorshrink-fitcomponents,rolled-intubes,etc.Otherapplicationsincludepredictingthedecreaseinthetightnessofgaskets,inthehoopstressofsolderlesswrappedconnections,intheconstrainingforceofsprings,andthestabilityofwiretendonsinprestressedconcrete.Theabilityofamaterialtorelaxathigh-stressconcentrationssuchasarepresentatnotches,inclusions,cracks,holes,fillets,etc.,maybepredictedfromstressrelaxationdata.Suchtestdataarealsousefultojudgetheheat-treatmentconditionnecessaryforthethermalreliefofresidualinternalstressesinforgings,castings,weldments,machinedorcold-workedsurfaces,etc.Thetestsoutlinedinthesemethodsarelimitedtoconditionsofapproximatelyconstantconstraintandenvironment.Thetestresultsarehighlysensitivetosmallchangesinenvironmentalconditionsandthusrequireprecisecontroloftestconditionsandmethods.Thereproducibilityofdatawilldependonthemannerwithwhichalltestconditionsarecontrolled.Theeffectsofagingorresidualstressmaysignificantlyaffectresults,asmayvariationsinmaterialcomposition.Note18212;Themethodoftestingforthestressrelaxationofplasticshasbeenwithdrawnfromthisstandard,andtheresponsibilityhasbeentransferredtoPracticeD2991.1.1Thesetestmethodscoverthedeterminationofthetimedependenceofstress(stressrelaxation)inmaterialsandstructuresunderconditionsofapproximatelyconstantconstraint,constantenvironment,andnegligiblevibration.Intheproceduresrecommended,thematerialorstructureisinitiallyconstrainedbyexternallyappliedforces,andthechangeintheexternalforcenecessarytomaintainthisconstraintisdeterminedasafunctionoftime.1.2Specificmethodsforconductingstressrelaxationtestsonmaterialssubjectedtotension,compression,bendingandtorsionstressesaredescribedinPartsA,B,C,andD,respectively.Thesetestmethodsalsoincluderecommendationsforthenecessarytestingequipmentandfortheanalysisofthetestdata.1.3Itisrecognizedthatthelongtimeperiodsrequiredforthesetypesoftestsareoftenunsuitedforroutinetestingorforspecificationinthepurchaseofmaterial.However,thesetestsarevaluabletoolsinobtainingpracticaldesigninformationonthestressrelaxationofmaterialssubjectedtotheconditionsenumerated,andininvestigationsofthefundamentalbehaviorofmaterials.1.4Units8212;Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.13.1Thistestmethodcoversthedeterminationofthetime-dependentdecreaseinstressinaspecimensubjectedtoanuniaxialconstanttensionstrainunderconditionsofuniformenvironmentandnegligiblevibration.Italsoincludesrecommendationsforthenecessarytestingequipment.22.1Thistestmethodcoversthedeterminationofthetime-dependentdecreaseinstressinaspecimensubjectedtoalongduration,uniaxial,constantcompressionstraininauniformenvironmentandnegligible......
【中国标准分类号】:A20
【国际标准分类号】:19_020
【页数】:13P.;A4
【正文语种】:英语