y, v(m)

Element numbers

3 (0.15,0.26)

F3x (2)

(5)

(3)

4 (0.5,0) 1 (0,0)

(1)

x, u (m)

(4)

F4y

2 (0.15,0)

Only symmetric part of stiffness matrices are output in .pch file. For the bar element we have 2 dof per node for planar structure. Therefore, each node has x and y displacement dof.

(1,1) (1,1)  (1,1)  (1,1) (1,1)  (1,1) (1,1)  (1,1)

(1,2) (1,2) (1,2) (1,2) (1,2) (1,2) (1,2)

(2,1) (2,1) (2,1) (2,1) (2,1) (2,1)

(2,2) (2,2) (2,2) (2,2) (2,2)

(3,1) (3,1) (3,1) (3,1)

  (1,1)   ( Node 1, xdof   (1,2)   ( Node 1, ydof      (2,1)   ( Node 2, xdof     (2,2)  ( Node 2, ydof    (3,1)     ( Node 3, xdof    ( Node 3, ydof (3,2)  (3,2)     (3,2) (4,1) (4,1)   ( Node 4, xdof    ( Node 4, ydof (3,2) (4,1) (4,4) (4,2) 

 1)   2)   1)    2)   1)   2)    1)   2)

Stiffness matrix output of Nastran in .pch file

DMIG DMIG* * DMIG* * * DMIG* * * DMIG* * DMIG* * * * DMIG* * * * * * DMIG* * * * *

KAAX KAAX

DMIG* * * * *

KAAX

0

2 3 3 4

2 0 1 1 1 2.099611628D+07 1 2 1 4.037713011D+06 2 6.998702552D+06 2 1 1-1.866666647D+07 1 2.666666638D+07 2 2 2 1.076923065D+07 3 1 1-2.329449814D+06 2-4.037713011D+06 1 6.467739991D+06 3 2 1-4.037713011D+06 2-6.998702552D+06 2-1.076923065D+07 1 9.635545937D+05 2 2.005159375D+07 4 1 1-7.999999915D+06 1-4.138290177D+06 2 3.074158417D+06 1 1.213829009D+07

8 (order of the stiffness matrix. 8X8) (first row up to the diagonal element=(1,1) (element of stiffness matrix multiplying the dof (1,1)) (second row up to the diagonal element=(1,2) (element of stiffness matrix multiplying the dof (1,1)) (element of stiffness matrix multiplying the dof (1,2)) (third row up to the diagonal element=(2,1) (element of stiffness matrix multiplying the dof (1,1)) (element of stiffness matrix multiplying the dof (2,1)) (fourth row up to the diagonal element=(2,2) (element of stiffness matrix multiplying the dof (2,2)) (fifth row up to the diagonal element=(3,1) (element of stiffness matrix multiplying the dof (1,1)) (element of stiffness matrix multiplying the dof (1,2)) (element of stiffness matrix multiplying the dof (3,1)) (sixth row up to the diagonal element=(3,2) (element of stiffness matrix multiplying the dof (1,1)) (element of stiffness matrix multiplying the dof (1,2)) (element of stiffness matrix multiplying the dof (2,2)) (element of stiffness matrix multiplying the dof (3,1)) (element of stiffness matrix multiplying the dof (3,2)) (seventh row up to the diagonal element=(4,1) (element of stiffness matrix multiplying the dof (2,1)) (element of stiffness matrix multiplying the dof (3,1)) (element of stiffness matrix multiplying the dof (3,2)) (element of stiffness matrix multiplying the dof (4,1))

3 3 4 4

4 2 1 3.074158417D+06 2-2.283660538D+06 1-3.074158417D+06 2 2.283660538D+06

(eight row up to the diagonal element=(4,2) (element of stiffness matrix multiplying the (element of stiffness matrix multiplying the (element of stiffness matrix multiplying the (element of stiffness matrix multiplying the

1 KAAX 1 1 KAAX 1 2 KAAX 2 KAAX 1 1 3 KAAX 1 1 2 3 3 KAAX

6

dof dof dof dof

(3,1)) (3,2)) (4,1)) (4,2))

Stiffness matrix output of the fortran code 0.20996E+08 0.40377E+07 -0.18667E+08 0.00000E+00 -0.23294E+07 -0.40377E+07 0.00000E+00 0.00000E+00 0.40377E+07 0.69987E+07 0.00000E+00 0.00000E+00 -0.40377E+07 -0.69987E+07 0.00000E+00 0.00000E+00 -0.18667E+08 0.00000E+00 0.26667E+08 0.00000E+00 0.00000E+00 0.00000E+00 -0.80000E+07 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.10769E+08 0.00000E+00 -0.10769E+08 0.00000E+00 0.00000E+00 -0.23294E+07 -0.40377E+07 0.00000E+00 0.00000E+00 0.64677E+07 0.96355E+06 -0.41383E+07 0.30742E+07 -0.40377E+07 -0.69987E+07 0.00000E+00 -0.10769E+08 0.96355E+06 0.20052E+08 0.30742E+07 -0.22837E+07 0.00000E+00 0.00000E+00 -0.80000E+07 0.00000E+00 -0.41383E+07 0.30742E+07 0.12138E+08 -0.30742E+07 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.30742E+07 -0.22837E+07 -0.30742E+07 0.22837E+07

Load vector output of Nastran DMIG* * * * * * * * *

PAX 1 1 2 2 3 3 4 4

1 0 1-8.692391441D+03 2-5.020649943D+03 1 9.094947018D-13 2-5.796402259D+03 1-1.676312023D+03 2 1.427217856D+04 1 1.044870346D+04 2-3.806709905D+03

(load (load (load (load (load (load (load (load

acting acting acting acting acting acting acting acting

on on on on on on on on

node node node node node node node node

Load vector output of the fortran code -0.86924E+04 -0.50207E+04 0.00000E+00 -0.57964E+04 -0.16763E+04 0.14272E+05 0.10449E+05 -0.38067E+04

1 1 2 2 3 3 4 4

in in in in in in in in

x y x y x y x y

direction:1) direction:2) direction:1) direction:2) direction:1) direction:2) direction:1) direction:2)

Format of the Stiffness matrix and load vector output in Nastran pch file ...

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