**Using ANSYS** - 2D, 2 element Beam model with concentrated masses at the free nodes

/batch /FILNAM,beam2 /title 2D Beam Sample Problem ! Two element 2D beam Sample Problem 4-14-99 KLL ! 2 elements with concentrated mass/inertia at free nodes /prep7 n, 1, 0.0, 0.0 ! Node 1 is located at (0.0, 0.0) n, 2, 1.0, 0.0 n, 3, 2.0, 0.0 et, 1, beam3 ! Element type; no.1 is beam3, 2D beam element et, 2, mass21, 0, 0, 3 ! Element type 2 is mass/inertia ! keyopt(3) = 3 means data = mass, inertia mp, ex, 1, 3.e7 ! Material Property, Elastic modulus no. 1; psi mp, prxy, 1, 0.3 ! Poisson's ratio mp, dens, 1, 0.736e-3 ! Mass density; (lbf/in^3)/(in/sec^2) ! In ANSYS documentation the symbol Izz is used with different meanings. ! Beam real constant set 1 for a 0.5 x 0.375 rectangular xsctn. ! Area, Izz (flexural Inertia), height 'h' as in sigma = Mc/I, c = h/2 ! A = 0.1875 in^2, Izz = 0.0022 in^4, h = 0.375 in ! (Note: here Izz is the area moment of inertia, length^4) r, 1, 0.1875, 0.0022, 0.375 ! 2D Concentrated mass/inertia real data ! mass = 0.2 lbf/(in/sec^2), Izz = 0.075 (lbf-in^2)/(in/sec^2) ! (Note: here Izz is the mass moment of inertia, mass x length^2) r, 2, .2, .075 ! beam elements type, 1 real, 1 en, 1, 1, 2 ! Element Number 1 (beam) connects nodes 1 & 2 en, 2, 2, 3 ! mass elements type, 2 real, 2 en, 3, 2 ! Element Number 3 (mass/inertia) is at node 2 en, 4, 3 d, 1, ux, 0. ! Displacement at node 1 in x-dir is zero d, 1, uy, 0. d, 1, rotz, 0. ! Rotation about z axis at node 1 is zero

Last update 4-14-99