I have attended the latest online seminar for staadpro hosted by Mr. Kris Sathia and he did the overview of what the software can do including its new features. One of them that he mentioned is the used of reference load, he did mention specifically that you can create a reference mass using reference load only once and that can be used for the static mass and dynamic mass definition. I did ask some clarification about this statement during the Q & A portion but unfortunately this was not answered due to time constraint.
So, I am posting again my question here hoping Mr. Kris would clarify my query, How does staadpro actually create a reference mass only once that can be used in static and dynamic mass definition if in the static mass definition you only need to consider the global Y direction whereas for the dynamic mass definition you need to consider the global X, Y and Z direction? In my understanding you still need to create two reference masses one for static and one for dynamic.
Hope Mr. Kris will clarify this. Thanks in advance
TucsonIX,
If weights are specified in X, Y and Z, STAAD will consider only those in Y for the seismic static case.
If weights are specififed only in X and/or Z, and Y is not specified, STAAD will take the larger of those in X and Z as the weights for the seismic static case.
The internal documents we have for this feature state the following:
GY is taken to be the default direction for seismic weight term “W” for seismic load case. If this weight is zero or negligible (<=1.0 kip), maximum weight along (GX,GZ) is considered as W.
Arunkumar Srinivasan,
If you need the response urgently, I suggest you send your questions to the Technical Support Group through a service ticket. One of the specialists in this aspect of the program will contact you with the solution. Else, if you can wait, one of them will post the answer on this forum.
i understand that in staad ,if you want to do response spectrum，you can use referenced loads,and.all loads should define in x,y,z three directions ,but want can I do with floor loads(not floor weight,it is only the weight of steel plate,and i use floor load to only to consider the weight),and can I define the floor load in three directions?
Just bumped into this post and noted that it has not been answered. Floor loads can be defined within the Reference Loads ( use MASS type reference load for defining seismic mass ) and it can be applied in all 3 directions.