练习非线性分析-大挠度拱梁

Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,大挠度拱梁,非线性分析,非线性分析-大挠度拱梁,说明,浅拱受到跨中载荷为,20,000,N,的作用。用线性和非线性（大挠度）两种分析分别确定跨中位移，比较它们的结果。,非线性分析-大挠度拱梁,载荷和材料属性,非线性分析-大挠度拱梁,1.按指定的工作目录用,“,beamarch,”,作为作业名，进入,ANSYS。,2.,建议按步骤,3-12,建立模型,如果不愿意这样做的话，可以恢复已存在的数据库,(,beamarch.db1),，直接跳到步骤13。,Utility Menu File Resume from,或使用命令:,RESUME,beamarch,db1,3.,在整体柱坐标系中定义四个关键点,:,关键点1的坐标,(1270,75),关键点,2,的坐标,(1270,90),关键点,3,的坐标,(1270,105),关键点,4,的坐标,(1270sin45,90).,关键点,4,是方向关键点,.,Utility Menu,WorkPlane,Change Active CS to Global Cylindrical,Main Menu Preprocessor -Modeling-Create,Keypoints,In Active CS,Utility Menu Parameters Angular Units.,或用命令:,/PREP7,CSYS,1,K,1,1270,75,K,2,1270,90,K,3,1270,105,*AFUN,DEG,K,4,(1270*SIN(45),90,非线性分析-大挠度拱梁,4.在关键点1和关键点2间定义线（弧），在关键点2和3间定义线,:,Main Menu Preprocessor -Modeling-Create -Lines-Lines In Active,Coord,+,或用命令:,L,1,2,L,2,3,5.,定义单元类型为,BEAM189,定义材料特性,(,EX=210e3,MPa,PRXY=0.3):,Main Menu Preprocessor Element Type Add/Edit/Delete,Main Menu Preprocessor Material Props Material Models Structural Linear Elastic-Isotropic,或用命令:,ET,1,BEAM189,MP,EX,1,210E3,MP,PRXY,1,0.3,6.,约束关键点1和3,UX,UY,和,UZ,位移,约束关键点2,UZ,位移,:,Main Menu Preprocessor Loads -Loads-Apply -Structural-Displacement On,keypoints,+,或用命令:,DK,1,UX,0,UY,UZ,DK,3,UX,0,UY,UZ,DK,2,UZ,0,非线性分析-大挠度拱梁,7.在关键点2的-,Y,方向上施加20000,N,的力,:,Main Menu Preprocessor Loads -Loads-Apply -Structural-Force/Moment On,keypoints,+,或用命令:,FK,2,FY,-20000,非线性分析-大挠度拱梁,8.定义梁的截面,:,Main Menu Preprocessor Sections -Beam-Common,Sectns,.,ID=1,Sub-Type=,Offset=,Centroid,B=25,H=12.5,按,OK,或用命令:,SECTYPE,1,BEAM,RECT,SECOFFSET,CENT,SECDATA,25,12.5,非线性分析-大挠度拱梁,9.指定线的属性,包括线的定位关键点,:,Main Menu Preprocessor -Attributes-Define All Lines.,MAT=1,TYPE=“1 BEAM189”,SECT=1,选择定位关键点为,“yes”,按,OK,拾取关键点,然后按,OK,或用命令:,LATT,1,1,4,1,非线性分析-大挠度拱梁,10.在所有线上设置单元分割数为10,:,Main Menu Preprocessor -Meshing-Size,Cntrls,-,ManualSize,-Lines-All Lines.,或用命令:,LESIZE,ALL,10,11.,对所有线进行网格划分,:,Main Menu Preprocessor -Meshing-Mesh Lines+,或用命令:,LMESH,ALL,12.,设置,/,ESHAPE,为“,on”,/,EFACET,为2,然后画出单元,:,Utility Menu,PlotCtrls,Style Size and Shape.,或用命令:,/ESHAPE,1,/EFACET,2,EPLOT,非线性分析-大挠度拱梁,13.存储数据库并进行线性求解：,Pick the“SAVE_DB”button in the Toolbar (or select:Utility Menu File Save as,Jobname.db,),Main Menu Solution -Solve-Current LS,或用命令:,SAVE,/SOLU,SOLVE,14.,选择节点2,(,跨中节点,),进入通用后处理器,POST1,并列出节点位移,:,Utility Menu Select Entities.,Main Menu General,Postproc,List Results Nodal Solution.,或用命令:,NSEL,S,2,/POST1,PRDISP,非线性分析-大挠度拱梁,15.选择全部实体，进入求解器，进行非线性求解,:,Utility Menu Select Everything,Main Menu Solution,Soln,Control.,在分析选项中激活,“L,arge,Displacement Static,”,选项,设定子步数,=10,按,OK,Main Menu Solution -Solve-Current LS,或用命令:,ALLSEL,/SOLU,NLGEOM,1,NSUBST,10,SOLVE,收敛控制图,非线性分析-大挠度拱梁,16.列出节点2的位移,:,Utility Menu Select Entities.,Main Menu General,Postproc,List Results Nodal Solution.,或用命令:,NSEL,S,2,/POST1,PRDISP,非线性分析-大挠度拱梁,17.选择全部实体，设置位移缩放比例为,5,然后画出,UY,位移,:,Utility Menu Select Everything,Utility Menu,PlotCtrls,Style Displacement Scaling,Main Menu General,Postproc,Plot Results -Contour Plot-Nodal,Solu,或用命令:,ALLSEL,/DSCALE,1,5,PLNSOL,U,Y,非线性分析-大挠度拱梁,18.画出位移,UY,的动画,:,Utility Menu,PlotCtrls,Animate Deformed Results,或用命令:,ANCNTR,10,0.5,19.,存储并退出,ANSYS:,Pick the“QUIT”button,in the Toolbar,或用命令:,FINISH,/EXIT,