2.6.6. Setting Spectrum Options.
There are many commands in this category, all meant to specify response spectrum data and power
spectral density (PSD) data. You use these commands in spectrum analyses, as described in the Struc-
tural Analysis Guide.
2.7. Creating Multiple Load Step Files
All loads and load step options put together form a load step, for which the program can calculate the
solution. If you have multiple load steps, you can store the data for each load step on a file, called the
load step file, and read it in later for solution.
The LSWRITE command writes the load step file (one file per load step, identified as Jobname.S01,
Jobname.S02,Jobname.S03, etc.). Use one of these methods:
Command(s):LSWRITE
GUI: Main Menu> Preprocessor> Loads> Load Step Opts> Write LS File
Main Menu> Solution> Load Step Opts> Write LS File
If you are using the Solution Controls dialog box to set your analysis and load step options, you define
each load step using the Basic tab. (You can use the Solution Controls dialog box for static and full
transient analyses only. For details, see Solution (p. 111).)
After all load step files are written, you can use one action command to read in the files sequentially
and obtain the solution for each load step (see Solution (p. 111)).
The sample set of commands shown below defines multiple load steps:
/SOLU! Enter SOLUTION
0
! Load Step 1:
D, ...! Loads
SF, ...
...
NSUBST, ...! Load step options
KBC, ...
OUTRES, ...
OUTPR, ...
...
LSWRITE! Writes load step file: Jobname.S01
! Load Step 2:
D, ...! Loads
SF, ...
...
NSUBST, ...! Load step options
KBC, ...
OUTRES, ...
OUTPR, ...
...
LSWRITE! Writes load step file: Jobname.S02
0See the Command Reference for descriptions of the NSUBST,KBC,OUTRES,OUTPR, and LSWRITE
commands.
Some notes about the load step file:
- The load step data are written to the file in terms of commands.
Release 15.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential informationCreating Multiple Load Step Files