土木专业英语--受弯构件.pptx
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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-torsionalbucklingofbeamsSolutionofLBTforsimply-supportedbeamwithuniformbending5.3Lateral-torsionalbucklingofbeamsSolutionofLBTforsimply-supportedbeamwithuniformbending5.3Lateral-torsionalbucklingofbeamsCriticalbendingmoment5.3Lateral-torsionalbucklingofbeamsCriticalbendingmoment5.3Lateral-torsionalbucklingofbeamsCriticalbendingmomentwithdifferentboundaryandloading5.3Lateral-torsionalbucklingofbeamsCriticalbendingmomentwithdifferentboundaryandloading5.3Lateral-torsionalbucklingofbeamsCriticalbendingmomentwitheffectsofsectiontypeandloading5.3Lateral-torsionalbucklingofbeamsCriticalbendingmomentwitheffectsofsectiontypeandloading5.3Lateral-torsionalbucklingofbeamsParametersaffecttheLTBofbeams5.3Lateral-torsionalbucklingofbeamsParametersaffecttheLTBofbeams5.3Lateral-torsionalbucklingofbeamsElastic-plasticlateral-torsionalbucklingofbeams5.3Lateral-torsionalbucklingofbeamsElastic-plasticlateral-torsionalbucklingofbeams5.3Lateral-torsionalbucklingofbeamsUltimatecapacityofbeamwithinitialimperfections5.3Lateral-torsionalbucklingofbeamsUltimatecapacityofbeamwithinitialimperfections5.3Lateral-torsionalbucklingofbeamsDesignequations5.3Lateral-torsionalbucklingofbeamsDesignequations5.Loadingpoint2.Torsionalangle3.simply-supportedbeam4.Criticalbandingmoment1.Shearcentre加载点扭转角简支梁临界弯矩剪心1.Whataretheconditionsnoneedtochecklateral-torsionalbucklingofbeams?
1.假设腹板厚度很小但有足够的刚度以保持它的形状,这样我们就可以得到相同的临界弯矩公式。
Answers:
1.Assumewebthicknessissmallbuthaveenoughstiffnesstokeepitsshape,thenwehavethesameequationofcriticalbendingmoment.Localbucklingofplatesinbeam5.4Localbucklingofplatesinbeamsintroduction5.4Localbucklingofplatesinbeamsintroduction5.4LocalbucklingofplatesinbeamsMethodtopreventplatesfromlocalbuckling5.4LocalbucklingofplatesinbeamsMethodtopreventplatesfromlocalbuckling5.4Localbucklingofplatesinbeamsstiffeners5.4Localbucklingofplatesinbeamsstiffeners5.4LocalbucklingofplatesinbeamsDesignagainstlocalbucklingofI-section5.4LocalbucklingofplatesinbeamsDesignagainstlocalbucklingofI-section5.4LocalbucklingofplatesinbeamsDesignagainstlocalbucklingofI-section5.4LocalbucklingofplatesinbeamsDesignagainstlocalbucklingofI-section5.4LocalbucklingofplatesinbeamsDesignagainstlocalbucklingofI-section5.4LocalbucklingofplatesinbeamsDesignagainstlocalbucklingofI-section5.4LocalbucklingofplatesinbeamsDesignagainstlocalbucklingofI-section5.4LocalbucklingofplatesinbeamsDesignagainstlocalbucklingofI-section5.4LocalbucklingofplatesinbeamsLimitofwidth-to-thicknessratioanddesignmethodofbeam5.4LocalbucklingofplatesinbeamsLimitofwidth-to-thicknessratioanddesignmethodofbeam5.4Localbucklingofplatesinbeamssummary5.4Localbucklingofplatesinbeamssummary5.Partiallyplasticdesign2.Compressiveflange3.Weldedbuilt-upsection4.hot-rolledsection1.Initialimperfection部分塑性设计受压翼缘焊接组合截面热轧截面初始缺陷6.post-bucklingstrength屈曲后强度1.Howtopromotethecriticallocalbucklingstressofbeams?
2.Whatisthelimitofwidth-to-thicknessratioofbeamflange?
Quiz6.uniformly-distributed-load8.Extremefiber4.solid-websection2.Shearforce9.Plasticneutralaxis3.Boundarycondition5.open-websection7.Concentratedload10.Sectionmodulus1.Bendingmoment16.Compressiveflange18.hot-rolledsection14.Lateral-torsionalbuckling12.Shearcentre19.Partiallyplasticdesign13.simply-supportedbeam15.Initialimperfection17.Weldedbuilt-upsection20.post-bucklingstrength11.Shearstress均布荷载边缘纤维实腹式截面剪力塑性中性轴边界条件空腹式截面集中荷载截面模量弯矩受压翼缘热轧截面侧向扭转屈曲剪心部分塑性设计简支梁初始缺陷焊接组合截面屈曲后强度剪应力
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