英语翻译Concreteischaracterizedbys-查字典问答网
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  英语翻译Concreteischaracterizedbystrongcompressivestrength,butisrelativelyweakintensionandshear.Itcansupportlargeaxialloads,andisusedextensivelyinthefoundationsoflargestructuressuchasbridgesandtallbuildings.butit

  英语翻译

  Concreteischaracterizedbystrongcompressivestrength,butisrelativelyweakintensionandshear.Itcansupportlargeaxialloads,andisusedextensivelyinthefoundationsoflargestructuressuchasbridgesandtallbuildings.butitbreakseasilyunderbendingwithoutreinforcingsteel.Concretewithcompressivestrengthof3,0006,000poundspersquareinch(psi)iscommon.

  TheAmericanConcreteInstitutedefinesanyconcreteover6,000psiashigh-strengthconcrete.

  Forstructuresthatrequireflexuralstrengthforresistancetobendingmoments,reinforcingsteel--rebar--isembeddedintheconcrete.Insomecases,tensionedcablesareplacedintheconcretetomakeprestressedorpost-tensionedconcrete.Thetensiontoresistthebendingmomentcomesfromthereinforcingsteelorthestressedcables.

  Foraconcretemixtoreachitsultimatestrength,alongperiodoftimeisneeded.Theultimatestrengthofconcreteandits28-daystrengtharenotthesame.Fordesignpurposes,engineersusethe28-daystrength,andtheconcreteshouldbesubjectedtoonlyminimumloadsuntilthe28dayshavepassed.Thatruleisveryrigidlyenforcedinheavyconstruction.Itisnotatalluncommonforworkinresidentialandmedium-risecommercialbuildingconstructiontobeprocessedona3-dayfloorcycle.Placeconcreteoneday,formandshorethenextflooroverthenexttwodays,thisputsminimumloadonthenewslab,andthenplaceconcreteonthethirdday.Thisplacementincreasestheloadonthepreviouslyplacedfloor,buttheloadiscarriedprimarilybytheshoring,whichpassescontinuallydownforseveralfloors,therebyshiftingtheloadtoconcretethathashadtimetoreachitsultimatestrength.NotetheshoringandreshoringinFig.6.5isinplacetoadepthoffourfloorsbelowtheslabthatiscurrentlybeingplaced.

  (ultimatestrengthofconcrete

  Thecompressivestrengthofconcretecontinuestoincreaseslowlyformanymonths.Theultimatestrengthmaybehigherthanthe28-daystrength,whichisusedfordesigncalculations.)

1回答
2020-03-09 22:17
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戈兆祥

  很简单的一段翻译,太懒了:(感觉我.

  keli1987好像不是土木工程专业的吧

  Concreteischaracterizedbystrongcompressivestrength,butisrelativelyweakintensionandshear.Itcansupportlargeaxialloads,andisusedextensivelyinthefoundationsoflargestructuressuchasbridgesandtallbuildings.butitbreakseasilyunderbendingwithoutreinforcingsteel.Concretewithcompressivestrengthof3,0006,000poundspersquareinch(psi)iscommon.

  混凝土材料特点是抗压能力强,抗拉和抗剪切能力差.能够承受很大的轴向压力,能够广泛的应用与桥梁和高层建筑的基础.但是如果不加钢筋,其很容易破坏.混凝土一般具有3,0006,000psi抗压强度.(1psi=0.069公斤=6900Pa)

  TheAmericanConcreteInstitutedefinesanyconcreteover6,000psiashigh-strengthconcrete.

  Forstructuresthatrequireflexuralstrengthforresistancetobendingmoments,reinforcingsteel--rebar--isembeddedintheconcrete.Insomecases,tensionedcablesareplacedintheconcretetomakeprestressedorpost-tensionedconcrete.Thetensiontoresistthebendingmomentcomesfromthereinforcingsteelorthestressedcables.

  美国混凝土协会定义超过6,000psi抗压强度的混凝土为高强混凝土.

  对于结构来说,需要弯曲应力去抵抗弯矩,因此钢筋被嵌入到混凝土材料中.有些情况,拉索(预应力筋)埋入混凝土构成预应力混凝土,可以采用先张法或者后张法.钢筋或者预应力索的拉力用于抵抗弯矩.

  Foraconcretemixtoreachitsultimatestrength,alongperiodoftimeisneeded.Theultimatestrengthofconcreteandits28-daystrengtharenotthesame.Fordesignpurposes,engineersusethe28-daystrength,andtheconcreteshouldbesubjectedtoonlyminimumloadsuntilthe28dayshavepassed.Thatruleisveryrigidlyenforcedinheavyconstruction.Itisnotatalluncommonforworkinresidentialandmedium-risecommercialbuildingconstructiontobeprocessedona3-dayfloorcycle.Placeconcreteoneday,formandshorethenextflooroverthenexttwodays,thisputsminimumloadonthenewslab,andthenplaceconcreteonthethirdday.Thisplacementincreasestheloadonthepreviouslyplacedfloor,buttheloadiscarriedprimarilybytheshoring,whichpassescontinuallydownforseveralfloors,therebyshiftingtheloadtoconcretethathashadtimetoreachitsultimatestrength.

  NotetheshoringandreshoringinFig.6.5isinplacetoadepthoffourfloorsbelowtheslabthatiscurrentlybeingplaced.

  混凝土达到极限承载力龄期需要很长时间.极限承载力和28天强度还有点区别.对于设计,工程师通常使用28天强度,混凝土未达到28天强度前仅能承受很小的荷载.这个规定在特殊建筑中需要强制执行.不同于一般的住宅和多层商业建筑可以3天作一个楼层.浇注混凝土1天,接下来2天给下一层支模,给新浇注的楼板最小的荷载,然后第三天再浇混凝土.这种浇注方法给前一层浇注的楼层施加荷载,但是这部分荷载主要给支撑模板,模板能把这部分荷载分散到先前的若干层上,因此这部分荷载能够分散到以前达到极限强度的楼层上.注意,图6.5的板下面4层楼高的支架已替换.

  (ultimatestrengthofconcrete

  Thecompressivestrengthofconcretecontinuestoincreaseslowlyformanymonths.Theultimatestrengthmaybehigherthanthe28-daystrength,whichisusedfordesigncalculations.)

  (混凝土极限强度:混凝土抗压强度灾数月内缓慢增加,混凝土极限强度可能高于28天强度,其用于设计计算)

2020-03-09 22:20:13

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