Underground Garage Design under Seismic
Underground Garage Design under Seismic
(OP)
I have a building in Maryland with the following information:
1. Three levels underground parking garage
2. Street level is a retail space
3. Second floor is a 14" thick concrete transfer floor
4. Four levels wood apartment building above the transfer floor.
I am using RAM RSS and Concept to design the concrete structure. This RAM model can only show concrete portion of the building which the wood building will only transfer DL and LL to the transfer floor.
The question I have is how to model this structure for seismic? If I take the entire building for seismic design, how do I specify the underground portion of the structure? Can I only model the one elevated slab plus the LL and DL of the wood struture for seismic design?
Please help.






RE: Underground Garage Design under Seismic
The vertical, lateral, and uplift loads from the wood portion can be applied to the podium slab, and the concrete portion designed separately.
The top of the podium slab can be taken as the seismic base for the wood portion, but this will have to be justified per calculations and code requirements.
Mike McCann
MMC Engineering
RE: Underground Garage Design under Seismic
RE: Underground Garage Design under Seismic
I think that section 12.2.31 of ASCE 7-05 outlines the procedure for a two stage equivalent lateral force procedure.
RE: Underground Garage Design under Seismic
By the way, thanks for bailing me out.
Mike McCann
MMC Engineering
RE: Underground Garage Design under Seismic
How about the underground portion of the building? Shall I only model the podium slab with wood structure for seismic? How about the underground portion of the building? Thanks.
RE: Underground Garage Design under Seismic
http://www.bssconline.org/NEHRP2003/comments/
HTH
RE: Underground Garage Design under Seismic
Mike McCann
MMC Engineering
RE: Underground Garage Design under Seismic
HTH
VOD