Nodal Forces from File - Original Format

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

1. File format (original)

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. Number of specified time instants, one input line

NTDFO

  • NTDFO: integer >= 1: Number of time instants for which nodal load components are specified.

The input data in Number of load components and time instant, one input line and Load components, MDCOMP input lines (below) must be given in one block for each defined time instant.

1.3. Number of load components and time instant, one input line

MDCOMP TIMDFO

  • MDCOMP: integer: Number of load components.

    • Used for control: MDCOMP = NDCOMP

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

1.4. Load components, MDCOMP input lines

RLMAG

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

2. Example

Example of nodal force file using original format (two nodal components) and input DYNAMIC NODAL FORCE:

This is an extract of the file on only 
'---------------------------------
' Example file:
'---------------------------------
' Unit name specification
' --------------------------------
' time length mass  force
   s   m    Mg     kN
'---------------------------------
'NTDFO =number of time instants
600
'---------------------------------
'for i=1: NTDFO
'MDCOMP  TIMESTEP
'RLMAG
' ...
'RLMAG_mdcomp
'---------------------------------
2  0.000000
0.000000
0.000000
2  0.200000
12.533323
49.737977
2  0.400000
24.868989
96.350735
2  0.600000
36.812455
136.909421

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
'----------------------------------------------------------------------