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1、外文文献翻译ReinforcedConcreteConcreteandreinforcedconcreteareusedasbuildingmaterialsineverycountry.Inmany,includingtheUnitedStatesandCanada,reinforcedconcreteisadominantstructuralmaterialinengineeredconstruction.Theuniversalnatureofreinforcedconcreteconstructionstemsfromthewide
2、availabilityofreinforcingbarsandtheconstituentsofconcrete,gravel,sand,andcement,therelativelysimpleskillsrequiredinconcreteconstruction,andtheeconomyofreinforcedconcretecomparedtootherformsofconstruction.Concreteandreinforcedconcreteareusedinbridges,buildingsofallsortsunde
3、rgroundstructures,watertanks,televisiontowers,offshoreoilexplorationandproductionstructures,dams,andeveninships.Reinforcedconcretestructuresmaybecast-in-placeconcrete,constructedintheirfinallocation,ortheymaybeprecastconcreteproducedinafactoryanderectedattheconstructionsit
4、e.Concretestructuresmaybesevereandfunctionalindesign,ortheshapeandlayoutandbewhimsicalandartistic.Fewotherbuildingmaterialsoffthearchitectandengineersuchversatilityandscope.Concreteisstrongincompressionbutweakintension.Asaresult,cracksdevelopwheneverloads,orrestrainedshrin
5、kageoftemperaturechanges,giverisetotensilestressesinexcessofthetensilestrengthoftheconcrete.Inaplainconcretebeam,themomentsabouttheneutralaxisduetoappliedloadsareresistedbyaninternaltension-compressioncoupleinvolvingtensionintheconcrete.Suchabeamfailsverysuddenlyandcomplet
6、elywhenthefirstcrackforms.Inareinforcedconcretebeam,steelbarsareembeddedintheconcreteinsuchawaythatthetensionforcesneededformomentequilibriumaftertheconcretecrackscanbedevelopedinthebars.Theconstructionofareinforcedconcretememberinvolvesbuildingafromofmoldintheshapeoftheme
7、mberbeingbuilt.Theformmustbestrongenoughtosupportboththeweightandhydrostaticpressureofthewetconcrete,andanyforcesappliedtoitbyworkers,concretebuggies,wind,andsoon.Thereinforcementisplacedinthisformandheldinplaceduringtheconcretingoperation.Aftertheconcretehashardened,thefo
8、rmsareremoved.Astheformsareremoved,propsofshoresareinstalledtosupporttheweightoftheconcre
