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1、Release10.0DocumentationforANSYSBEAM1883-DLinearFiniteStrainBeam三维线性有限应变梁单元BEAM188ElementDescriptionBEAM188单元描述BEAM188issuitableforanalyzingslendertomoderatelystubby/thickbeamstructures.ThiselementisbasedonTimoshenkobeamtheory.Sheardeformationeffectsareincluded.Beam188单元
2、适合于分析从细长到中等粗短的梁结构，该单元基于铁木辛哥梁结构理论，并考虑了剪切变形的影响。BEAM188isalinear(2-node)oraquadraticbeamelementin3-D.BEAM188hassixorsevendegreesoffreedomateachnode,withthenumberofdegreesoffreedomdependingonthevalueofKEYOPT(1).WhenKEYOPT(1)=0(thedefault),sixdegreesoffreedomoccurateachnode.T
3、heseincludetranslationsinthex,y,andzdirectionsandrotationsaboutthex,y,andzdirections.WhenKEYOPT(1)=1,aseventhdegreeoffreedom(warpingmagnitude)isalsoconsidered.Thiselementiswell-suitedforlinear,largerotation,and/orlargestrainnonlinearapplications.Beam188是三维线性（2节点）或者二次梁单元。
4、每个节点有六个或者七个自由度，自由度的个数取决于KEYOPT(1)的值。当KEYOPT(1)＝0（缺省）时，每个节点有六个自由度；包括节点坐标系的x、y、z方向的平动和绕x、y、z轴的转动。当KEYOPT(1)=1时，每个节点有七个自由度，这时引入了第七个自由度（横截面的翘曲）。这个单元非常适合线性、大角度转动以及大应变等非线性问题。BEAM188includesstressstiffnessterms,bydefault,inanyanalysiswithNLGEOM,ON.Theprovidedstressstiffnessterm
5、senabletheelementstoanalyzeflexural,lateral,andtorsionalstabilityproblems(usingeigenvaluebucklingorcollapsestudieswitharclengthmethods).当NLGEOM选项打开的时候，beam188的应力刚化，在任何分析中都是缺省项。应力刚化选项使本单元能分析弯曲、横向及扭转稳定问题（用弧长法分析特征值屈曲和塌陷）。BEAM188canbeusedwithanybeamcross-sectiondefinedviaSEC
6、TYPE,SECDATA,SECOFFSET,SECWRITE,andSECREAD.Thecross-sectionassociatedwiththebeammaybelinearlytapered.Elasticity,creep,andplasticitymodelsaresupported(irrespectiveofcross-sectionsubtype).Across-sectionassociatedwiththiselementtypecanbeabuilt-upsectionreferencingmorethanon
7、ematerial.Beam188可以采用sectype、secdata、secoffset、secwrite及secread命令定义横截面。本单元支持弹性、蠕变及塑性模型（不考虑横截面子模型）。这种单元类型的截面可以由不同材料组成。BEAM188ignoresanyrealconstantdatabeginningwithRelease6.0.SeetheSECCONTROLScommandfordefiningthetransverseshearstiffness,andaddedmass.Beam188从6.0版本开始忽略任何实常
8、数，参考seccontrols命令来定义横向剪切刚度和附加质量。ForBEAM188,theelementcoordinatesystem(/PSYMB,ESYS)isnotrelevant.单元坐标系统（
