土木专业英语--受弯构件.pptx

土木专业英语--受弯构件.pptx

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5.1Introduction5.2Cross-sectionalresistanceofbeams5.3Lateral-torsionalbucklingofbeams5.4LocalbucklingofplatesinbeamIntroduction5.1Introduction5.1IntroductionStateofloading-bendingmoment-shearforce-axialforce-combinationofabove-bendingaboutoneaxis-bendingaboutbothaxes（bi-axialbending）5.1Introduction5.1IntroductionBoundaryconditionsandspansStructuralsystemandloadtransfer5.1Introduction5.1IntroductionSectiontypesSolid-websection（normal/lightgauged）CastellatedbeamCompositebeam5.1Introduction5.1IntroductionSectiontypesSolid-websectionOpen-websectionNon-uniformsection（height,width,strength）Lacedbuilt-upsection5.1IntroductionFailuremodes5.1IntroductionFailuremodesStrengthfailure（cross-sectionresistance）Lateral-torsional-buckling（LTB）ofbeamYield,fracture,fatigueFlexural-torsionalbucklingLocalbucklingofplatesinbeamFlange:

compressionLessrigidityofbendingExcessivedeflectionWeb:

compression,bendingandshear5.1IntroductionDeflectionofbeam（calculationofelasticdeflectionandrigidity）5.1IntroductionDeflectionofbeam（calculationofelasticdeflectionandrigidity）Uniformly-distributed-loadConcentratedloadatmid-spanMultipleconcentratedloadRequirementofrigidity6.Boundarycondition8.solid-websection4.Roofpurlin2.Shearforce9.open-websection3.Axialforce5.Cranebeam7.multi-spancontinuousbeam10.uniformly-distributed-load1.Bendingmoment边界条件实腹式截面屋面檩条剪力空腹式截面轴向力吊车梁多跨连续连续梁均匀分布荷载弯矩1.Whatcharactersshouldthestateofloadingforbendingmembersbe?

2.Howmanysectiontypesarethereforbendingmembers?

Cross-sectionalresistanceofbeamsassumption-perfectelastic-plasticmodel-crosssectionremainsplaneduringbending5.2Cross-sectionalresistanceofbeamsBendingmomentresistance

（1）5.2Cross-sectionalresistanceofbeamsBendingmomentresistance

（1）Distributionofnormalstrainandstress5.2Cross-sectionalresistanceofbeamsBendingmomentresistance

（2）5.2Cross-sectionalresistanceofbeamsBendingmomentresistance

（2）Criteria1:

YieldingatextremefiberCriteria2:

YieldonfullsectionCriteria3:

YieldingonpartialsectionElasticnet（effective）sectionmodulusplasticnetsectionmodulusElasticnetsectionmodulus5.2Cross-sectionalresistanceofbeamsConceptoffullplasticmoment5.2Cross-sectionalresistanceofbeamsConceptoffullplasticmomentAssumptionofstressdistribution-subjectedtobendingonly,notension-stressateachpointreachyieldpoint-yieldpointundertensionandcompressionisthesamePlasticneutralaxisTheplasticneutralaxisdividesthecrosssectionintoequalareas,anditmaynotcoincidewiththecentroidalaxis（Full）plasticmomentPlasticmodulusofasection5.2Cross-sectionalresistanceofbeamsReviewofsectionmodulus5.2Cross-sectionalresistanceofbeamsReviewofsectionmodulus5.2Cross-sectionalresistanceofbeamsBendingmomentresistance（3）5.2Cross-sectionalresistanceofbeamsBendingmomentresistance（3）Bi-axialbending:

YieldingatextremefiberCriteria1:

Criteria2:

YieldonfullsectionCriteria3:

Yieldingonpartialsection5.2Cross-sectionalresistanceofbeamsShearresistance5.2Cross-sectionalresistanceofbeamsShearresistance5.2Cross-sectionalresistanceofbeamsTransverseforceresistance5.2Cross-sectionalresistanceofbeamsTransverseforceresistance5.2Cross-sectionalresistanceofbeamsTransverseforceresistance5.2Cross-sectionalresistanceofbeamsTransverseforceresistance5.2Cross-sectionalresistanceofbeamsStateofstressesandequivalentstress5.2Cross-sectionalresistanceofbeamsStateofstressesandequivalentstress5.2Cross-sectionalresistanceofbeamsDesignprocedureofbeamstrength5.2Cross-sectionalresistanceofbeamsDesignprocedureofbeamstrength5.2Cross-sectionalresistanceofbeamsDifferentialequationsforelasticLTBofbeam5.2Cross-sectionalresistanceofbeamsDifferentialequationsforelasticLTBofbeam5.2Cross-sectionalresistanceofbeamsPreparation:

shearcentre5.2Cross-sectionalresistanceofbeamsPreparation:

shearcentre5.2Cross-sectionalresistanceofbeamsPreparation:

freetorsion5.2Cross-sectionalresistanceofbeamsPreparation:

freetorsion5.Boundarycondition2.Extremefiber3.Plasticneutralaxis4.stiffener1.Perfectelastic-plasticmodel边界条件边缘纤维塑性中和轴加劲理想弹塑性模型1.Whatarethreecriteriasofbendingmomentresistanceforbendingmembers?

2.Whatisthedesignprocedureofbeamstrength?

1.塑性中和轴将横截面分为相等的两部分，并且它可能与形心轴不同。

Answers:

1.Theplasticneutralaxisdividesthecrosssectionintotwoequalareas,anditmaynotcoincidewiththecentroidalaxis.Lateral-torsionalbucklingofbeams5.3Lateral-torsionalbucklingofbeamsDifferentialequationsforelasticLTBofbeam5.3Lateral-torsionalbucklingofbeamsDifferentialequationsforelasticLTBofbeam5.3Lateral-torsionalbucklingofbeamsDifferentialequationsforelasticLTBofbeam5.3Lateral-torsionalbucklingofbeamsDifferentialequationsforelasticLTBofbeam5.3Lateral-torsionalbucklingof