超静定梁的有限元建模计算

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1、6超静定梁的有限元建模计算计算分析模型如图所示, 习题文件名: statically indeterminate beam梁承受均布载荷：1.0e5 Plm图 1 超静定梁的计算分析模型6.1 进入 ANSYS程序 f ANSYSED f Interactive f change the working directory into yours f inputInitial jobname: statically indeterminate beamf Run6.2设置计算类型ANSYS Main Menu: Preferences fselect Structural f OK 6.3选择单

2、元类型ANSYS Main Menu: Preprocessor fElement TypefAdd/Edit/Delete fAdd fselectBeam tapered 44 fOK(back to Element Typeswindow) fClose(the Element Typewindow) 6.4 定义材料参数ANSYS Main Menu: Preprocessor fMaterial Props fMaterial Models fStructural f Linear fElastic fIsotropic finput EX:2.1e11, PRXY:0.3 f OK

3、 6.5 定义截面ANSYS Main Menu: Preprocessor f Sections f Beam f Common Sectns f 定义矩形 截面:ID=1,B=0.01,H=0.1 fOK6.6 生成几何模型生成特征点ANSYS Main Menu: Preprocessor fModeling fCreate fKeypoints fIn Active CS f依次输入三个点的坐标：input:1(0,0),2(1,0),3(2,0),4(0,0,1) fOK/生成梁ANSYS Main Menu: Preprocessor Modeling Create Lines -

4、lines f Straight lines f依次连接三个特征点，1(0,0), 2(1,0),3(2,0) -OK/显示梁体ANSYS 命令菜单栏：PlotCtrls Style Size and Style /ESHAPE On OK6.7 网格划分ANSYS Main Menu: Preprocessor Meshing Mesh Attributes Picked lines OK 拾取:SECT:1； Pick Orientation Keypoint(s):YES拾取：4#特征点(0,0,1) OKMesh Tool (Size Controls) lines: Set Pick

5、 All(in Picking Menu) input NDIV:8 OK (back to Mesh Tool window) Mesh Pick All (in Picking Menu) Close (the Mesh Tool window)6.8 模型施加约束丁分别给1,2,3三个特征点加约束ANSYS Main Menu: Solution Define Loads Apply Structural Displacement On Keypoints 拾取 1,2,3 keypoints OK select All DOF OK/施加y方向的载荷ANSYS Main Menu: S

6、olution Define Loads Apply Structural Pressure On Beams Pick All LKEY:2,VALI:100000 OK6.9 分析计算ANSYS Main Menu: Solution Solve Current LS OK(to close the solve Current Load Step window) OK6.10 结果显示ANSYS Main Menu: General Postproc Plot Results Deformed Shape select Def + Undeformed OK (back to Plot R

7、esults window) Contour Plot Nodal Solu select: DOF solution, UY, Def + Undeformed, Rotation, ROTZ ,Def + UndeformedOK6.11 退出系统ANSYS Utility Menu:File Exit Save EverythingOK5超静定桁架的有限元建模与分析计算分析模型如图 所示, 习题文件名: truss。图 1 超静定桁架的计算分析模型5.1 进入 ANSYS程序 f ANSYSED f Interactive f change the working directory i

8、nto yours f inputInitial jobname: trussf Run5.2设置计算类型ANSYS Main Menu: Preferences fselect Structural f OK5.3选择单元类型ANSYS Main Menu: Preprocessor fElement TypefAdd/Edit/Delete fAdd fselect Link 2D spar 1 f OK (back to Element Types window) f Optionsf select K3: Plane Strain fOKfClose (the Element Type

9、window) 5.4 定义材料参数ANSYS Main Menu: Preprocessor fMaterial Props fMaterial Models fStructural f Linear fElastic fIsotropic finput EX:2.1e11, PRXY:0.3 f OK 5.5定义实常数ANSYS Main Menu: Preprocessor f Real Constants. fAdd. f select Type 1f OK finput AREA:0.25 fOK fClose (the Real Constants Window)5.6 生成几何模

10、型/生成特征点ANSYS Main Menu: Preprocessor Modeling Create Keypoints Tn Active CS f依次输入四个点的坐标：input:1(1,1),2(2,1),3(3,1),4(2,0) OK/生成桁架ANSYS Main Menu: Preprocessor Modeling Create Lines Lines StraightLine 依次连接四个特征点，1(1,1),2(2,1),3(3,1),4(2,0) OK5.7 网格划分ANSYS Main Menu: Preprocessor Meshing Mesh Tool(Size

11、 Controls) lines: Set 依次拾取三根杆:OKinput NDIV: 1 OK (back to the mesh tool window)Mesh: lines Mesh Pick All (in Picking Menu) Close( the Mesh Tool window)5.8 模型施加约束/分别给1,2,3三个特征点施加x和y方向的约束ANSYS Main Menu: Solution Define Loads Apply Structural Displacement On Keypoints 拾取 1(1,1),2(2,1),3(3,1)三个特征点 OK s

12、elect Lab2:UX, UY OK/给4#特征点施加y方向载荷ANSYS Main Menu: Solution Define Loads Apply Structural Force/Moment On Keypoints 拾取特征点 4(2,0) OK Lab: FY, Value: -100e6 OK5.9 分析计算ANSYS Main Menu: Solution Solve Current LS OK(to close the solve Current Load Step window) OK5.10 结果显示ANSYS Main Menu: General Postproc Plot Results Deformed Shape.select Def + Undeformed OK (back to Plot Results window) Contour Plot Nodal Solu select: DOF solution, UY, Def + Undeformed OK5.11 退出系统ANSYS Utility Menu: File Exit Save EverythingOK