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1、第7章受扭構(gòu)件承載力計(jì)算Chaper7Torsionalstrengthofmembers7.1（概述）Introduction7.2（純扭構(gòu)件試驗(yàn)研究）Experimentaboutpuretorsionmember7.3（純扭構(gòu)件承載力）Torsionalcapacityofmembersunderpuretorsion7.4（彎、剪、扭構(gòu)件承載力）Torsionalcapacityofmemberundercombinedflexure,shearandtorsion7.7（構(gòu)造要求）Detaili
2、ngrequirements7.1Introduction（概述）兩類扭矩（Twotypesoftorsion）Equilibriumtorsion(平衡扭矩)：根據(jù)靜力平衡條件確定的扭矩、初始扭矩staticallydeterminatetorsion;primarytorsion由靜力平衡確定，與剛度無關(guān)Itisdeterminedbasedonstaticequilibrium,andnotrelatedtothetorsionalstiffness.Compatibilitytorsion(協(xié)調(diào)扭
3、矩)：staticallyindeterminatetorsion（超靜定扭矩）;secondarytorsion無法根據(jù)靜力平衡確定，與剛度及變形相關(guān)Itcannotbedeterminedbasedonstaticequilibriumalone,andrelatedtothetorsionalstiffnessanddeformationofmembers.7.2Experimentofpuretorsion1.（開裂前純扭構(gòu)件受力分析）Mechanicalanalysisofpuretorsion
4、beforecrack主拉應(yīng)力超過抗拉強(qiáng)度后，開裂，并沿45°斜向發(fā)展，和上下底面相交后進(jìn)行發(fā)展，形成螺旋形斜裂縫，構(gòu)件破壞。Whentheprinciplestressesexceedthetensilestrength,cracksformatthemiddlepointoflongersideandextenddiagonallyalong45°linetotheneighboringfaces.Finally,cracksarespiralwhenthememberreachesitsultima
5、tecapacity.Spiralcracks2.Torsionalreinforcements（受扭鋼筋）StirrupsLongitudinalbars2.受扭破壞模式scarce-reinforcedfailure（少筋破壞）TensionfailureUnder-reinforcedfailure（適筋破壞）BendingfailureUnder-reinforcedmember,scarce-reinforcedmember,Partiallyover-reinforcedmember,Over
6、-reinforcedmemberWhenmemberisadequatelyreinforced,thereinforcementsyieldbeforeconcretecrushes.Calculationoftorsionalstrength（承載力計(jì)算）Whentorsionalreinforcementsareinadequate,membersfailassoonascracksform.Minimumamountoftorsionalreinforcements（最小鋼筋用量）Partial
7、lyover-reinforcedfailure（部分超筋）Over-reinforcedFailure（全部超筋）CompressionfailureWhentwotypesoftorsionalreinforcementsareexcessive,thereinforcementsdonotyieldbeforeconcretecrushes.Whenonetypeoftorsionalreinforcementsisexcessive,theexcessivereinforcementsdonoty
8、ieldbeforeconcretecrushes.Checktheminimumdimensionofsection（最小截面尺寸驗(yàn)算）Controltheratiooflongitudinalbarstostirrups（?）7.3Torsionalcapacityofmemberunderpuretorsion（純扭構(gòu)件抗扭承載力）1、開裂扭矩（Crackingtorque)Tcr45°F1F2F3F4Principle
