cyclic loading please ?

Dear Alaamohra,
 
We would say that you can perform cyclic loading in DIANA by:
1) static approach
In this case you specify your load (displacement, applied load, etc) in
your model data file as a static loading. As for instance:
'LOADS'
CASE 1
ELEMEN
/ 1 / FORCE -100.0
       FACE   KSI2
       DIRECT  2
Then in the command file, you would specify an executable block like:
BEGIN EXECUTE
    BEGIN LOAD
       LOADNR=1
       STEPS EXPLIC SIZES 0.1(1) -0.1(1) 0.1(1) -0.1(1)
    END LOAD
 BEGIN ITERAT
 ...........
 END ITERAT
END EXECUTE
2) Dynamic analysis (time domain)
In the model data file you would define the following load input with time dependency,
see Section III – Dynamic Analysis in DIANA 9.4 Analysis Procedures manual for details:
'LOADS'
CASE 1
ELEMEN
/ 1 / FORCE  -100.0
       FACE   KSI2
       DIRECT  2
'TIMELO'
LOAD 1
TIMES  0.0  1.0   2.0   3.0 /
FACTOR 0.0 -1.0   1.0  -1.0 /
Then in the command file, you would specify an executable block like:
BEGIN EXECUTE
 BEGIN TIME
  BEGIN STEPS
   ..........
  END STEPS
 END TIME
 BEGIN ITERAT
 ...........
 END ITERAT
END EXECUTE
I hope it to be helpful,
Kesio Palacio
TNO DIANA support team