Unable to select many analysis types

[Anonymous]

Hi, 

I wanted to give a time history force input, for that when i went to analysis types->new ...nothing except modal , footfall and sesmic are available..all the other ones are grayed out ...

Does this depend on the type of structure, i am worknig on a truss structure. 

[Rafal.Gaweda · Accepted solution]

Modal is required to run \ define THA.
Define Modal first then THA

[Anonymous]

I have defined the Modal case and have given a THA function as well...

But how to add this to a case, I am unable to select the function which I have defined earlier !? 

[Rafal.Gaweda]

Do I see it correctly? Negative time ?

[Anonymous]

Aaah...thats my mistake, i have copied the force time history from another s/w...its supposed to be build-up stage...I have removed it, now its fine. I am able to add the function .. 😄