Seismic Joint vs. Structural Separation
Seismic Joint vs. Structural Separation
(OP)
I have an addition to a large church. To simplify the design the new portion of the structure is separated from the existing building by a 1-1/2" joint. We have referred to this on our plans as a "Seismic Joint". This is typical for our office. According to the architect, by using this label the mechanical engineer has to add extensive hardware for all of his pipes/ducts that cross this joint. However, if we refer to the joint as a "Structural Separation" these requirements do not apply.
What is the difference between these two terms?
What is the difference between these two terms?






RE: Seismic Joint vs. Structural Separation
You have elected to create two separate structures, each with their own lateral force resisting systems. Each has unique performance characteristics such as their natural period, wind deflection and seismic deflection.
You design your structure and have a maximum seismic deflection in A and also in B. The combined deflection is the gap that you should provide between the buildings. You also have wind deflections between the two buildings.
The mechanical engineer should be notified (by you) of what these deflections are - wind and seismic deflections will be different.
It is up to them to propoerly meet the code and detail accordingly.
RE: Seismic Joint vs. Structural Separation
RE: Seismic Joint vs. Structural Separation
Garth Dreger PE
AZ Phoenix area
RE: Seismic Joint vs. Structural Separation
RE: Seismic Joint vs. Structural Separation
BA
RE: Seismic Joint vs. Structural Separation
RE: Seismic Joint vs. Structural Separation
The mechanical engineer was fishing for a way to avoid having to use flexible connectors. They are out of luck since we do need accommodate differential movement.
Thanks for the input.