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四川交通职业技术学院SichuanVocational&TechnicalCollegeofCommunications土木工程英语四川交通职业技术学院教学课件(The2ndTalent-CompetitionforTeachersofSVTCC)国家示范性高等职业技术学院教师：黄蜀云公共课教学nit6Stress&Deformation
EnglishforCivilEngineering～RoadEngineering四川交通职业技术学院SichuanVocational&TechnicalCollegeofCommunications国家示范性高等职业技术学院|Lead-in(导入)|Dialogue(对话)|Text(课文)|Exercises(练习)|GuidedWriting(写作)|Lead-incopyright@黄蜀云
Stressisthephysicalpressureorotherforcesexertedonanobject.Deformationinanydirectionisthetotalchangeinthedimensionofamemberinthatdirection.DeformationForce
EnglishforCivilEngineering～RoadEngineering四川交通职业技术学院SichuanVocational&TechnicalCollegeofCommunications国家示范性高等职业技术学院|Lead-in(导入)|Dialogue(对话)|Text(课文)|Exercises(练习)|GuidedWriting(写作)|Lead-incopyright@黄蜀云
pre-stressingoperatingWorkplatformAnchorboltsrebarconcrete
EnglishforCivilEngineering～RoadEngineering四川交通职业技术学院SichuanVocational&TechnicalCollegeofCommunications国家示范性高等职业技术学院|Lead-in(导入)|Dialogue(对话)|Text(课文)|Exercises(练习)|GuidedWriting(写作)|Dialoguecopyright@黄蜀云
A:Sincemanypre-stressingreinforcedconcretecomponentsareadoptedinproject,itisnecessarytohavealookatthepre-stressingoperating.fixingformworkexertingtension
EnglishforCivilEngineering～RoadEngineering四川交通职业技术学院SichuanVocational&TechnicalCollegeofCommunications国家示范性高等职业技术学院|Lead-in(导入)|Dialogue(对话)|Text(课文)|Exercises(练习)|GuidedWriting(写作)|Dialoguecopyright@黄蜀云
B:Therebarispre-stressedfirstbyacertaintensionforceandfixedonbothends.Thenwefixtheformworkandnon-prestressedrebar,andthenpourconcrete.Aftertheconcretereachesthedesignedstrength,thepre-stressedrebarare
released.pouringconcretereleasingrebar
EnglishforCivilEngineering～RoadEngineering四川交通职业技术学院SichuanVocational&TechnicalCollegeofCommunications国家示范性高等职业技术学院|Lead-in(导入)|Dialogue(对话)|Text(课文)|Exercises(练习)|GuidedWriting(写作)|Dialoguecopyright@黄蜀云
B:Therebarispre-stressedfirstbyacertaintensionforceandfixedonbothends.Thenwefixtheformworkandnon-prestressedrebar,andthenpourconcrete.Aftertheconcretereachesthedesignedstrength,thepre-stressedrebarare
released.releasingrebarpouringconcrete
EnglishforCivilEngineering～RoadEngineering四川交通职业技术学院SichuanVocational&TechnicalCollegeofCommunications国家示范性高等职业技术学院|Lead-in(导入)|Dialogue(对话)|Text(课文)|Exercises(练习)|GuidedWriting(写作)|Dialoguecopyright@黄蜀云
A:Thestrengthfromthepre-stressingmembersistransferredtotheconcrete,isn’tit?B:Yes.Thepre-stressedconcretewilloffsetsomeorallthetensionforcewhenitisunderthesituationoftensionstrength.rebaroffsetthetensionforce
Pressure
EnglishforCivilEngineering～RoadEngineering四川交通职业技术学院SichuanVocational&TechnicalCollegeofCommunications国家示范性高等职业技术学院|Lead-in(导入)|Dialogue(对话)|Text(课文)|Exercises(练习)|GuidedWriting(写作)|Dialoguecopyright@黄蜀云
A:Arethereanydifferencesbetweenthepre-stressedconcreteandnon-prestressedconcreteinconcretepouring?B:Inordertoreducetheconcreteshrinkageunderthepre-stressing,thepre-stressedconcreteshouldbepouredcontinuouslyinonetimewithoutconstructionjoints.theratioofwaterandcementshouldbelowandtheaggregateshouldbeselectedinbetterquality.constructionjoints
EnglishforCivilEngineering～RoadEngineering四川交通职业技术学院SichuanVocational&TechnicalCollegeofCommunications国家示范性高等职业技术学院|Lead-in(导入)|Dialogue(对话)|Text(课文)|Exercises(练习)|GuidedWriting(写作)|Dialoguecopyright@黄蜀云
A:Whencanthefixturesofthepre–stressedrebarberemoved?B:Itdependsonwhethertheconcretestrengthreachesthedesignedvalueornot.Atleastthetestshouldshowthattheresultisuptothestandard.ifthefixturearereleasedtooearly,itwillcauselotsofstrengthlossandevenseriousqualityproblem.
EnglishforCivilEngineering～RoadEngineering四川交通职业技术学院SichuanVocational&TechnicalCollegeofCommunications国家示范性高等职业技术学院|Lead-in(导入)|Dialogue(对话)|Text(课文)|Exercises(练习)|GuidedWriting(写作)|Dialoguecopyright@黄蜀云
TechnicalTermsoftheDialogue1.模板2.水泥3.骨料4.钢筋混凝土5.预应力6.预应力钢筋
7.施工缝8.拉(张)力
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GroupWorkTrytoexplaininyourownwordsthetechnicaltermslearnedinthedialogueandthentalkabouttheprocessofpre-stressingoperation.
EnglishforCivilEngineering～RoadEngineering四川交通职业技术学院SichuanVocational&TechnicalCollegeofCommunications国家示范性高等职业技术学院|Lead-in(导入)|Dialogue(对话)|Text(课文)|Exercises(练习)|GuidedWriting(写作)|Textcopyright@黄蜀云
Whendesigningastructure,thedesignermustestimatealltheforcesactingonthestructureanditscomponentparts.Theeffectsoftheforcesarethenconsideredinrelationtothestabilityofabuildingasawholeandcomponentpartsaremadestrongenoughtocarrytheirparticularfunction.
EnglishforCivilEngineering～RoadEngineering四川交通职业技术学院SichuanVocational&TechnicalCollegeofCommunications国家示范性高等职业技术学院|Lead-in(导入)|Dialogue(对话)|Text(课文)|Exercises(练习)|GuidedWriting(写作)|Textcopyright@黄蜀云
Theforcestobeconsidereddependonthetypeandpurposeofthestructure.Inbuildings,forexample,theforceswillbe
duetotheweightofthestructureanditsoccupantsaswellastothepressureexertedbywind.
EnglishforCivilEngineering～RoadEngineering四川交通职业技术学院SichuanVocational&TechnicalCollegeofCommunications国家示范性高等职业技术学院|Lead-in(导入)|Dialogue(对话)|Text(课文)|Exercises(练习)|GuidedWriting(写作)|Textcopyright@黄蜀云
Theloadsofabuilding
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Inthewallforretainingearth,theforceswillbeduetotheweightofthewall,thepressureexertedonthewallbytheearthbehindit,andthepressureduetoanybuildingsorroadwaysnearthetopofthewall.挡土墙受力
EnglishforCivilEngineering～RoadEngineering四川交通职业技术学院SichuanVocational&TechnicalCollegeofCommunications国家示范性高等职业技术学院|Lead-in(导入)|Dialogue(对话)|Text(课文)|Exercises(练习)|GuidedWriting(写作)|Textcopyright@黄蜀云
Theinternalfibersorparticlesofthevariouspartsofastructureareputintoastateofstressbytheforcestheyareneededtoresist,thebasicformsofstressbeingtension,compression,shearandtorsion.batensioncompression
EnglishforCivilEngineering～RoadEngineering四川交通职业技术学院SichuanVocational&TechnicalCollegeofCommunications国家示范性高等职业技术学院|Lead-in(导入)|Dialogue(对话)|Text(课文)|Exercises(练习)|GuidedWriting(写作)|Textcopyright@黄蜀云
Intension,thematerialispulledapartorstretchedlikearubberband.
Incompression,thematerialispressedorpushedtogether.
EnglishforCivilEngineering～RoadEngineering四川交通职业技术学院SichuanVocational&TechnicalCollegeofCommunications国家示范性高等职业技术学院|Lead-in(导入)|Dialogue(对话)|Text(课文)|Exercises(练习)|GuidedWriting(写作)|Textcopyright@黄蜀云
Whatistorsion?Itmakesthestructurerotateorturn.torsion
EnglishforCivilEngineering～RoadEngineering四川交通职业技术学院SichuanVocational&TechnicalCollegeofCommunications国家示范性高等职业技术学院|Lead-in(导入)|Dialogue(对话)|Text(课文)|Exercises(练习)|GuidedWriting(写作)|Textcopyright@黄蜀云
Theshearingforcecausesshearingstress.Itisdefinedasthefractureofthematerialsalongthestressroute.shearFF
EnglishforCivilEngineering～RoadEngineering四川交通职业技术学院SichuanVocational&TechnicalCollegeofCommunications国家示范性高等职业技术学院|Lead-in(导入)|Dialogue(对话)|Text(课文)|Exercises(练习)|GuidedWriting(写作)|Textcopyright@黄蜀云
Sincethestructuredesignedbycivilengineersisintendedtobestable,theseforcesmustbekeptinbalance.Theverticalforces,forexample,mustbeequaltoeachother.ifabeamsupportsaloadabove,thebeamitselfmusthavesufficientstrengthtocounterbalancethatweight.F1F2F1F2=
EnglishforCivilEngineering～RoadEngineering四川交通职业技术学院SichuanVocational&TechnicalCollegeofCommunications国家示范性高等职业技术学院|Lead-in(导入)|Dialogue(对话)|Text(课文)|Exercises(练习)|GuidedWriting(写作)|Textcopyright@黄蜀云
Thehorizontalforcesmustalsobeequaltoeachothersothatthereisnottoomuchthrusteithertotherightortotheleft.theforcesthatmightpullthestructurearoundmustbecounterbalancedwithforcesthatpullintheoppositedirection.F1F2=F2F1
EnglishforCivilEngineering～RoadEngineering四川交通职业技术学院SichuanVocational&TechnicalCollegeofCommunications国家示范性高等职业技术学院|Lead-in(导入)|Dialogue(对话)|Text(课文)|Exercises(练习)|GuidedWriting(写作)|Textcopyright@黄蜀云
ifamancarriesaheavyload,hisbodyisdistressedasa
resultoftheeffortshehastomaketobeartheload.Inordertograsptheideaofstress,itishelpfultocomparefibersofamaterialsubjectedtoforcetothebonesandmusclesofaman.
EnglishforCivilEngineering～RoadEngineering四川交通职业技术学院SichuanVocational&TechnicalCollegeofCommunications国家示范性高等职业技术学院|Lead-in(导入)|Dialogue(对话)|Text(课文)|Exercises(练习)|GuidedWriting(写作)|Textcopyright@黄蜀云
Amaterialissuretodeformtoagreaterorlesserextentwhenitissubjectedtostress,althoughthedimensionalvariationsinstructuralmaterialsareusuallyveryslight.thedeformationproducedisoftencalledstrain.amemberstressedincompressionbecomesshorterandfatter.
EnglishforCivilEngineering～RoadEngineering四川交通职业技术学院SichuanVocational&TechnicalCollegeofCommunications国家示范性高等职业技术学院|Lead-in(导入)|Dialogue(对话)|Text(课文)|Exercises(练习)|GuidedWriting(写作)|Textcopyright@黄蜀云
QuestionsWhatshouldadesignerestimateindesigningastructureWhatarethefourbasicformsofstress?Howcantheforcesofthestructurebekeptinbalance?Inwhatconditiondoesamaterialdeform?Takeanexample
EnglishforCivilEngineering～RoadEngineering四川交通职业技术学院SichuanVocational&TechnicalCollegeofCommunicat
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