phased loading in FEAP

[lredmond]

I am trying to first load a masonry wall specimen by slowly displacing it vertically and then hold the specimen at that displacement while doing a pushover analysis. I have tried the following using the command PROP:

loading 1=displacement vertically
loading 2=displacement horizontally

BATCh
  PROP,,1,2
END
   1,0,0,25,0,1,0,0,0
   1,0,25,100,0,1,0,0,0

Can someone tell me what I am doing wrong, or if there is a better way to implement the loading condition I would like to model?

Thanks
Laura

[Prof. R.L. Taylor]

Laura,

1. You need 2 prop loads

2. You should specify in the input part of your data file which prop load affects each derection (e.g., use an EPROP or similar command).

3. This will allow the loading to be applied in the sequence you want.

This should allow you to solve your problem.

[lredmond]

I thought I had specified 2 proportional loads using the command fprop, but when i run the file, the horizontal displacement never occurs.


FPROportional
1   0   0   1
2   0   0   1
3   0   0   1
4   0   0   1
5   0   0   1
6   0   0   1
7   0   0   1
8   0   0   1
9   0   0   1
10   0   0   1
11   0   0   1
12   0   0   1
13   0   0   1
14   0   0   1
15   0   0   1
16   0   0   1
17   0   0   1
18   0   0   1
19   0   0   1
20   0   0   1
21   0   0   1
22   0   0   1
23   0   0   1
24   0   0   1
25   0   0   1
26   0   0   1
27   0   0   1
136   0   2   0

END

BATCh
  PROP,,1,2
END
   1,0,0,25,0,1,0,0,0
   1,0,25,100,0,1,0,0,0

Do I need to call the command PROP twice?

Thanks
Laura

[ngucong]

I also have the same problem for sequence loading.
Is there any way to define 2 PRO and each runs the different load sequence at the different time?

Thank you,

[Prof. R.L. Taylor]

Yes,  each PROP command only can refer to one proportional load (at present), thus using

BATCh
    PROP,,1
END
  data

BATCh
    PROP,,2
END
  data

should allow for two different prop loads to exist -- I think your way just reads both records into the same prop load (the first one!).

[superxao]

Dear Prof. Taylor,

i used a similar way as your indications for Laura but it still doesn't work right. Can you please help me to show where i am doing wrong?

Thank you very much!