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SAP2000- A bug? Top story shear not read?

SAP2000- A bug? Top story shear not read?

SAP2000- A bug? Top story shear not read?

(OP)
Hello,

I have a five story regular R/C building.
User lateral load is defined at diapragm levels.

No mistakes on the diapragm or constraint(or restraint) definitions. It is doubly doubly checked.

When I read the output, i see that lateral force which should have been acting on the top floor could not be accounted by the program, only the first 4 floor forces are taken into account.

Now this is the suprizing part.
When i add a DUMMY joint upon the top story elevation, the model works perfectly.

This is the second time I face with this situation. I search on the internet about this if it is a known issue or bug but couldnt come up with anything.

Well the important point i should mention, The global grids are changed in z direction. Probably this is the main reason about the problem at the top story.

Anyone experinced this issue lately.

not: grid coordinates or element dimensions are checked, there is not any roundup issue such as 12.9999999999 :)

Thanks in advance.

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