Nodal Forces from File

The file format is described in the following sections. An example of a nodal force file is given at the end of this section.

1. File format (column)

1.1. Unit names, one input line

UT UL UM UF

  • UT: character(6): Unit name for time

  • UL: character(6): Unit name for length

  • UM: character(6): Unit name for mass

  • UF: character(6): Unit name for force

1.2. Time Step and Load Components, one line for each time step

TIMDFO  RLMAGi ..... RLMAGn

  • TIMDFO: real > 0: Time instant for the specified load components \(\mathrm {[T]}\)

  • RLMAGi: real: Magnitude of load component \(\mathrm {[F]}\), \(\mathrm {[FL]}\)

RLMAGi must be repeated n=MDCOMP times.

2. Example

Example of nodal force file using two-column format (extract only).

'------------------------------------------
' Example file:
'------------------------------------------
' Unit name specification
'------------------------------------------
' time length mass  force
   s   m    Mg     kN
'------------------------------------------
' time    fx_glb [kN]     fy_glb [kN]
'------------------------------------------
0        0                    0
0.2	 12.53332336	49.73797743
0.4	 24.86898872	96.35073482
0.6	 36.81245527	136.9094212
0.8	 48.17536741	168.8655851
1.0  58.77852523	190.2113033
1.2	 68.45471059	199.6053457
1.4	 77.05132428	196.4574501
1.6	 84.43279255	180.9654105
1.8	 90.48270525	154.1026486
2.0  95.10565163	117.5570505
..
..

The order of the load components in the file must be the same as the order of the load components defined in the DYNAMIC NODAL FORCE input. In the example above, the first load component is the global X-direction force and the second load component is the global Y-direction force.

'----------------------------------------------------------------------
 DYNAMIC NODAL FORCES
'----------------------------------------------------------------------
'ndcomp cinput chfloa
 2      FILE   ..\..\..\ST_force\force.txt
'line-id ilseg ilnod ildof chicoo
 line    1     21    1     GLOBAL
 line    1     21    2     GLOBAL
'----------------------------------------------------------------------