Masonry Elevator Shaft in Wood Framed Building
Masonry Elevator Shaft in Wood Framed Building
(OP)
Hello,
I was asked/assigned to design an elevator shaft in a wood framed building with 10'-6" floor to floor height. The building lateral resisting capacity of the building is provided entirely by roof/floor diaphgragms and shearwalls. The building is under Seismic Design Category B (per IBC).
Dimensions of the elevator shaft are 8'6"x6'11" (inside)x 34'6" in height (from the top of the reinforced concrete pit to top of CMU shaft). 8" CMU wall thickness is proposed by the Architect.
Since I am not familar with Masonry structure, could anyone please point me to any references/direction regarding the design, detail of the above structure?
Following are what we have at the office:
- Design of Reinforced Masonry Structures by Narendra Taly, P.E.
- Building Code Requirements and Specification for Masonry Structures (TMS 402-08/ACI 530-08/ASCE 5-08).
Any input will be appreciated,
HN.
I was asked/assigned to design an elevator shaft in a wood framed building with 10'-6" floor to floor height. The building lateral resisting capacity of the building is provided entirely by roof/floor diaphgragms and shearwalls. The building is under Seismic Design Category B (per IBC).
Dimensions of the elevator shaft are 8'6"x6'11" (inside)x 34'6" in height (from the top of the reinforced concrete pit to top of CMU shaft). 8" CMU wall thickness is proposed by the Architect.
Since I am not familar with Masonry structure, could anyone please point me to any references/direction regarding the design, detail of the above structure?
Following are what we have at the office:
- Design of Reinforced Masonry Structures by Narendra Taly, P.E.
- Building Code Requirements and Specification for Masonry Structures (TMS 402-08/ACI 530-08/ASCE 5-08).
Any input will be appreciated,
HN.






RE: Masonry Elevator Shaft in Wood Framed Building
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Masonry Elevator Shaft in Wood Framed Building
Good backup is his "Masonry Design Manual".
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Masonry Elevator Shaft in Wood Framed Building
I don't know if the ban is still in effect, but personally, I prefer cast-in-place concrete or timber for elevator shafts.
BA
RE: Masonry Elevator Shaft in Wood Framed Building
RE: Masonry Elevator Shaft in Wood Framed Building
RE: Masonry Elevator Shaft in Wood Framed Building
Brad
RE: Masonry Elevator Shaft in Wood Framed Building
hokie, I would agree that masonry cores should be concrete filled all around.
Brad, masonry wasn't really an option, but if the ban has been lifted, I would certainly consider it now. Maybe the face shell could be removed where attachments are to be made so that the fasteners are made in solid concrete.
BA
RE: Masonry Elevator Shaft in Wood Framed Building
@ Everyone: Thank you very much for your prompt response.
RE: Masonry Elevator Shaft in Wood Framed Building
By mixing a masonry core with external wood franing, you are going to have to deal with differential shrinkage of the wood floor to floor relative to the masonry that will not shrink.
Don't forget this aspect in designing the connections.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Masonry Elevator Shaft in Wood Framed Building
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Masonry Elevator Shaft in Wood Framed Building
Those are flexible diaphragms. As far as connection, I am planinng to use metal straps/ties (by Simpson or equivalent) embeded into CMU walls at floor diaphragm levels.