Structure is 2 parts

[Mohammed_Ata]

Hellow , i have structure 80m long. I have to separate it into 2 parts 40m and 40m . I already define the model .

Defining seismic loads has a trouble .Each part has its seismic loads .

How to define loads for each part to be in action in eccentricity  5% ? 

Does RSA understand the 5% is for each part or for all the structure ? 

[Artur.Kosakowski]

I would suggest running seismic analysis for each of the models separately.

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

[Mohammed_Ata]

I have one raft for the whole structure ! i want to solve the raft for the total reactions . 

[Artur.Kosakowski]

See http://forums.autodesk.com/t5/Robot-Structural-Analysis/Only-reaction-for-new-model-API/m-p/3659242/...

Otherwise you may try the following:

1. Define self-weight for the part A only

2. Define modal analysis with the disregard density switched on; definition of eccentricities in real (rather than relative) values

3. Convert case from the point 1 into the mass assigned to modal case from the point 2

4. Define seismic analysis

5. Define self-weight for the part B only

6. Define modal analysis with the disregard density switched on; definition of eccentricities in real (rather than relative) values

7. Convert case from the point 5 into the mass assigned to modal case from the point 6

8. Define seismic analysis

and check the results with care.

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

[Mohammed_Ata]

Ok , i can do this but eccentricity from what ? from the edge of story or fron G(center of gravity) ? 

[Artur.Kosakowski]

G 

[Mohammed_Ata]

Hi , Artur . I have donewhat you have said to me but , there is one force for one story as before . I want to define forces for each part . RSA read the G for 2 parts ! RSA doesn't read G for each part . How can i make what i want ? 

[Artur.Kosakowski]

The story table is not capable of displaying results independently for selected parts of a structure treating them as a separate models.