Thank you all for your responses. I have determined that the section first referred to in the original post does apply to additions to existing buildings.
I have been able to reduce the gap a little by comparing deflections at the same elevations of the buildings.
Thanks,
The structures are about 36' tall two stories with a clerestory. My deflection is about 2" on the addition, but when I multiply by Cd (5) and divide by I (1.25) and rho (1.3) I get a drift of about 6". Assuming the existing building has half that deflection, because it is a bigger building. I...
Thank you both for the information. This building is in seismic design category D. I am getting a required separation of about 7.25" and the architect is saying that is way bigger than anything he has dealt with.
I am designing an addition to an existing building. Both structures are braced frame structures.
Do I need to design the gap between the structures per section 1613.6.7 of the IBC or is there a different requirement for the gap where additions are concerned or gaps in new structures?
