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外文翻译---建筑中的结构设计及建筑材料StructureinDesignofArchitectureAndStructuralMaterialWehaveandthearchitectsmustdealwiththespatialaspectofactivity,physical,andsymbolicneedsinsuchawaythatoverallperformanceintegrityisassured.Hence,heorshewellwantstothinkofevolvingabuildingenvironmentasatotalsystemofinteractingandspaceformingsubsystems.Isrepresentsacomplexchallenge,andtomeetitthearchitectwillneedahierarchicdesignprocessthatprovidesatleastthreelevelsoffeedbackthinking:schematic,preliminary,andfinal.Suchahierarchyisnecessaryifheorsheistoavoidbeingconfused,atconceptualstagesofdesignthinking,bythemyriaddetailissuesthatcandistractattentionfrommorebasicconsiderations.Infact,wecansaythatanarchitect’sabilitytodistinguishthemorebasicformthemoredetailedissuesisessentialtohissuccessasadesigner.Theobjectoftheschematicfeedbacklevelistogenerateandevaluateoverallsite-plan,activity-interaction,andbuilding-configurationoptions.Todosothearchitectmustbeabletofocusontheinteractionofthebasicattributesofthesitecontext,thespatialorganization,andthesymbolismasdeterminantsofphysicalform.Thismeansthat,inschematicterms,thearchitectmayfirstconceiveandmodelabuildingdesignasanorganizationalabstractionofessentialperformance-spaceinteractions.Thenheorshemayexploretheoverallspace-formimplicationsoftheabstraction.Asanactualbuildingconfigurationoptionbeginstoemerge,itwillbemodifiedtoincludeconsiderationforbasicsiteconditions.Attheschematicstage,itwouldalsobehelpfulifthedesignercouldvisualizehisorheroptionsforachievingoverallstructuralintegrityandconsidertheconstructivefeasibilityandeconomicofhisorherscheme.Butthiswillrequirethatthearchitectand/oraconsultantbeabletoconceptualizetotal-systemstructuraloptionsintermsofelementaldetail.Suchoverallthinkingcanbeeasilyfedbacktoimprovethespace-formscheme.Atthepreliminarylevel,thearchitect’semphasiswillshifttotheelaborationofhisorhermorepromisingschematicdesignoptions.Herethearchitect’sstructuralneedswillshifttoapproximatedesignofspecificsubsystemoptions.Atthisstagethetotalstructuralschemeisdevelopedtoamiddlelevelofspecificitybyfocusingonidentificationanddesignofmajorsubsystemstotheextentthattheirkeygeometric,component,andinteractivepropertiesareestablished.Basicsubsysteminteractionanddesignconflictscanthusbeidentifiedandresolvedinthecontextoftotal-systemobjectives.Consultantscanplayasignificantpartinthiseffort;thesepreliminary-leveldecisionsmayalsoresultinfeedbackthatcallsforrefinementorevenmajorchangeinschematicconcepts.Whenthedesignerandtheclientaresatisfiedwiththefeasibilityofadesignproposalatthepreliminarylevel,itmeansthatthebasicproblemsofoveralldesignaresolvedanddetailsarenotlikelytoproducemajorchange.Thefocusshiftsagain,andthedesignprocessmovesintothefinallevel.Atthisstagetheemphasiswillbeonthedetaileddevelopmentofallsubsystemspecifics.Heretheroleofspecialistsfromvariousfields,includingstructuralengineering,ismuchlarger,sincealldetailofthepreliminarydesignmustbeworkedout.DecisionsmadeatthislevelmayproducefeedbackintoLevelIIthatwillresultinchanges.However,ifLevelsIandIIarehandledwithinsight,therelationshipbetweentheoveralldecisions,madeattheschematicandpreliminarylevels,andthespecificsofthefinallevelshouldbesuchthatgrossredesignisnotinquestion,Rather,theentireprocessshouldbeoneofmovinginanevolutionaryfashionfromcreationandrefinement(ormodification)ofthemoregeneralpropertiesofatotal-systemdesignconcept,tothefleshingoutofrequisiteelementsanddetails.Tosummarize:AtLevelI,thearchitectmustfirstestablish,inconceptualterms,theoverallspace-formfeasibilityofbasicschematicoptions.Atthisstage,collaborationwithspecialistscanbehelpful,butonlyifintheformofoverallthinking.AtLevelII,thearchitectmustbeabletoidentifythemajorsubsystemrequirementsimpliedbytheschemeandsubstantialtheirinteractivefeasibilitybyapproximatingkeycomponentproperties.Thatis,thepropertiesofmajorsubsystemsneedbeworkedoutonlyinsufficientdepthtoverytheinherentcompatibilityoftheirbasicform-relatedandbehavioralinteraction.ThiswillmeanasomewhatmorespecificformofcollaborationwithspecialiststhenthatinlevelI.AtlevelIII,thearchitectandthespecificformofcollaborationwithspecialiststhenthatprovidingforalloftheelementaldesignspecificsrequiredtoproducebiddableconstructiondocuments.OfcoursethissuccesscomesfromthedevelopmentoftheStructuralMaterial.Theprincipalconstructionmaterialsofearliertimeswerewoodandmasonrybrick,stone,ortile,andsimilarmaterials.Thecoursesorlayerswereboundtogetherwithmortarorbitumen,atarlikesubstance,orsomeotherbindingagent.TheGreeksandRomanssometimesusedironrodsorclapstostrengthentheirbuilding.ThecolumnsoftheParthenoninAthens,forexample,haveholesdrilledinthemforironbarsthathavenowrustedaway.TheRomansalsousedanaturalcementcalledpuzzling,madefromvolcanicash,thatbecameashardasstoneunderwater.Bothsteelandcement,thetwomostimportantconstructionmaterialsofmoderntimes,wereintroducedinthenineteenthcentury.Steel,basicallyanalloyofironandasmallamountofcarbonhadbeenmadeuptothattimebyalaboriousprocessthatrestrictedittosuchspecialusesasswordblades.Aftertheinventionoft