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Elevator
7

Elevator

Elevator

(OP)
hi all,
im designing a 7 story Reinforced Concrete Building, and it will have an elevator in the middle of the stair, my question is: do i have to put Shear walls beside the elevator ??

Pea$e  

RE: Elevator

2
If you are designing a 7-story reinforced concrete frame building, you should know the answer to your question, otherwise you need help on a local basis...not from a forum.

RE: Elevator

(OP)
hmmmmmm,

its rude answer i guess !!! anyway i dont think it has anything to do with basis, the problem is i dont know in detials how to install an elevator in the building ,im not asking about the building saftey, i know it wont have to do any thing with safety of the building, actually im asking in installing the elevator in the building, i think i can do that without any shearwalls, am i right !!

i think we all get confused in sometimes, if u think that question is bad, just ignore it, that will be much better not to hear from u anymore.

Pea$e OnLy for who deserve it.

RE: Elevator

2
What do you mean by:  shearwalls   ????

For any building, shearwalls are lateral force resisting systems that stabilize your building against wind and seismic forces.

When you asked if shearwalls were needed in an elevator shaft, you showed us that you do not understand what a shearwall is for, or how one determines if and where shearwalls are needed.

Ron's answer was in response to seeing that lack of understanding in your question.  No structural engineer who knows what they are doing would ask:  "is a shearwall needed in an elevator shaft" with no other data included in the question.

The answer was given:  you don't seem to understand what a shearwall is...therefore, go get some help from a local structural engineer.  

It wasn't rude....but was responsive and responsible.

RE: Elevator

I think Ron and JAE are absolutely correct. Even in your response, you are not even sure of what is a shear wall. Also you have life safety issues to contend with such as fire rating, which you must work with project architect.

RE: Elevator

(OP)
hey guys, i know exactly what shearwall is, im asking about the elevator not the shear wall, i think my title say that !!!!
Simply who knows the answer of the following question may kindly answer it, or give a link.

HOW TO INSTALL AN ELEVATOR IN BUILDING.

answering wihtout giving a lesson in how to talk english would be appreciatted.

Pea$e

RE: Elevator

Well, we were just trying to respond to:

"my question is: do i have to put Shear walls beside the elevator ??"

That's a different question than:

"HOW TO INSTALL AN ELEVATOR IN BUILDING."

Most times, an elevator manufacturer will be contacted by the architect and will offer a preliminary design that includes data sheets on the type and size of elevator required in your building.  

From a structural standpoint, the elevator will require vertical guide-rails that extend from the lowest level up to the top level.  These are usually WT shapes that span from floor to floor and are located on three sides of the cab.  The guide-rails take horizontal and vertical forces and these are provided by the elevator mfr.

Most guide-rails can only span a max. 13 ft (4000 mm)

For 7 stories, the elevator is most likely a traction type (meaning it is hung from cables above).  There would be a room above the shaft that houses the elevator machinery.  The floor of this room is supported by horizontal steel beams (usually placed on a diagonal orientation) that support the weight of the floor, floor live load, machinery, and vertical elevator cable forces.

The elevator mfr. will provide these cable forces and machinery weights as well.  Also provided would be all geometric space requirements of the shaft and machinery room.

Shaft walls usually must be fire rated - this is worked out with the architect.  The walls may or may not be "shear walls" - that is totally up to you as the structural engineer as you need to decide what the lateral force resisting system is.

RE: Elevator

IYIeI2cY,

Do you mean, will shear walls around the elevator shaft prevent the installation of the elevator equipment?

I think, logically, that shear walls will not prevent this, and that elevator equipment is designed to be installed thru the door openings, and thru the top of the shaft.

RE: Elevator

I guess you are asking if you need to place something like a shearwall to support the elevator's dead and live load. If this is the case, and it's a mechanical elevator (not an hydraulic one), it's vertical load components are taken at the top of the system, usually you have a slab there which allows to transfer the loads to the vertical load resisting system you have designed.
Regarding horizontal loads (EQ), I also applied them at the top slab level, which sounds as the most critical position of the loaded elevator for seismic actions.
I hope it was a kind answer, anyway, and in case you're in a seismic zone, I do agree with the other guys. Maybe you have a good expertise with low height buildings (the non-elevators type of building) but higher buildings is anoter history (depending on their height to minimum plan dimension)    

Regards

RE: Elevator

2
I wasnt clear as the the intent of the original posting but to answer the question whether you "need" a shear wall at the perimeter of the elevator cab, answer is not necessarily.

two common types of elevators are traction type for multi-level structures and hydraulic type for lowrises.  Gravity loads can be taken by framing of the machine room for sheave loads and uplift on the machines for traction types and by the foundation for the hydraulic types.

For both cases, lateral forces can be designed to be carried by guiderail support framing (tube steel columns as an example).  Any lateral force are transferred to the upper and lower diaphragms via these vertical guiderail supports.  Of course, having a shear wall at the perimeter doesn't hurt also.  Say concrete or masonry wall all around as a shaft and guiderails can be mounted directly on the wall.

Shear wall is not mandatory around the elevator.

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