《超静定桁架》word版

1、教程2：超静定桁架的有限元分析三杆轴力计算的有限元分析如图所示平行杆系1、2、3悬吊着横梁AB（AB的变形略去不计），在横梁上作用着载荷P =100KN。如杆1、2、3的截面积、长度、弹性模量均相同，即分别为A = 0.0003m2，l = 2m，E = 200GPa。求1、2、3三杆的轴力N1、N2、N3。习题文件名: gan。（刘鸿文编材料力学上册第78页习题2.43）图 三杆轴力的计算分析模型此题理论解为N1=83.333KN，N2=33.333KN，N3=16.667KN交互式的求解过程1 进入ANSYS程序 ANSYS 8.0 Configure ANSYS Products fil

2、e Management input job name: ganRun2设置计算类型 ANSYS Main Menu: Preferences select Structural OK3选择单元类型ANSYS Main Menu: Preprocessor Element TypeAdd/Edit/DeleteAddselect Link 2D spar 1 Apply select Constraint Nonlinear MPC 184 OK (back to Element Types window) 选中TYPE2 options 在K1的下拉列表中选择：Rigid Beam，K2 下

3、拉列表中选择：Direct Elimination OK Close (the Element Type window) 。4定义实常数ANSYS Main Menu: PreprocessorReal ConstantsAdd/Edit/DeleteAddselect Type 1OKinput AREA:0.0003OKClose5定义材料参数ANSYS Main Menu: Preprocessor Material Props Material Models Structural LinearElasticIsotropicinput EX:200e9 OKClose (the Mat

4、erial Props window)ANSYS Main Menu: PreprocessorModelingCreateElementsElem AttributesMAT select 16生成有限元模型6.1 生成节点ANSYS Main Menu: Preprocessor Modeling Create Nodes In Active CS input:1(-1,0,0)Applyinput:3(1,0,0)OKANSYS Main Menu: PreprocessorModelingCreateNodesFill between Ndsselect 1,3节点OKOKANSYS

5、Main Menu: Preprocessor Modeling Create Nodes In Active CS input:4(-1,-2,0)Applyinput:6(1,-2,0)OKANSYS Main Menu: PreprocessorModelingCreateNodesFill between Ndsselect 4,6节点OKOK6.2 生成三杆模型ANSYS Main Menu: PreprocessorModelingCreateElementsAuto NumberedThru Nodesselect 1,4节点Applyselect 2,5节点Applyselec

6、t 3,6节点OK7 定义多点约束ANSYS Main Menu: PreprocessorModelingCreateElementsElem AttributesTYPE select 2 MPC184 ANSYS Main Menu: PreprocessorModelingCreateElementsAuto NumberedThru Nodesselect 4,5节点Applyselect 4,6节点OK8 模型施加约束8.1 分别给1,2,3三个节点施加约束ANSYS Main Menu: Solution Define Loads Apply Structural Displac

7、ement On Nodes select 1,2,3三个节点 OK select Lab2:ALL DOF OK8.2 给4节点施加y方向载荷ANSYS Main Menu: Solution Define Loads Apply Structural Force/Moment On Nodes select 4节点 OK Lab: FY, Value: -100000 OK9 分析计算ANSYS Main Menu: Solution Solve Current LS OK(to close the solve Current Load Step window) OK10 结果显示ANSYS Main Menu: General Postproc Element Table Define Table Add input Nu:0,Lab:Force,在左侧表中select By sequence num,在右侧表中select SMICS,在右侧表下的文本框 input 1 OK(back to Element Table Data window) Close ANSYS M