LSREAD/LSWRITE problems

[abusementpark]

I am using someone's input file that was written based on ANSYS 9.0. I am trying to diagnose some error messages I am getting by using the input file on ANSYS 11.0.

It is basically an input file to perform non-linear (large deflection & material) analysis on an I-beam. The file uses LSWRITE and LSREAD to write and read the load step data from step to step.

However, the characteristics of the analysis also requires use of the EKILL command and this is resulting in this error message at the beginning of each load step:

*** ERROR *** CP = 1529.734 TIME= 21:05:18
LSWRITE/LSSOLVE cannot be used with the birth-death option
(EKILL/EALIVE). Use the multiple SOLVE method instead.


This doesn't make any sense to me. Why would I not be able to use LSREAD/LSWRITE with the EKILL command? Was this previously possible in version 9.0?

The analysis still appears to be working with the multiple SOLVE method, which I assume automatically writes and reads the data from load step to load step. I am just confused as to why the error message occurs in the first place.

Any insight on this topic would be greatly appreciated.

 

[RahulLeslieAlexander]

If your analysis has element birth and death, you can't use LSWRITE/LSSOLVE kind of load steps. Instead, separate your load steps by SOLVE command. Like:

load listing for load step 1
...
SOLVE
load listing for load step 2
...
SOLVE
load listing for load step 3
...
SOLVE
.
etc.


This will, however, be a continuous analysis (just like LSSOLVE), sice we are not putting FINI after each SOVLE command.

Regards,
Rahul Leslie