pre-cast wall done by others

[delagina]

i will be doing a small 2-story structure with pre-cast walls. pre-cast wall done by others.

what information do you normally supply to them if pre-cast wall is not your scope?

 

[delagina]

anyone?

thanks,

 

[csd72]

Not sure what the standard US practice is but in my experience elsewhere the building engineer specifies the required dimensions, reinforcement e.t.c. for the permanent condition and the precaster designs it for erection (lifting stresses e.t.c.).

If this wall is a fire wall then it will need to have minimum thickness for fire rating, the precaster will not know this.

 

[delagina]

thanks,

it may not be the case in my structure coz i am looking at a similar structure drawing as go-by, it just say 7" thk reinforced conc. insulated panel.

didnt specify the how many rebars so am guessing it should have been designed by others.

even embedded plate is by panel mfr.

 

[delagina]

i just realized these precast panels are not structural members. it's in the architectural drawing.

 

[csd72]

If you need it is needed for the stability of the building then it is structural.

You will need to provide a full set of loads to the manufacturer.

 

[delagina]

no, i dont need it for stability. it's just there to contain fire inside the building. i am not sure though if panel manufacturer needs wind load pressure from me or not.

 

[Brad805]

Assuming you have indicated you want sealed shop drawings and you are in Canada (I believe it is the same in the US), you should spec out:

1. Typical panel section.
2. Typcial panel connections (base, mid height, and roof). If your panels are connecting to any flexible beams you might want to use a connector that will allow the beam to deflect freely.
3. Basic design loads.
4. Site Class so they can figure out the minimum seismic loads if these are non-load bearing.

It is up to the precast designer to figure out the rebar requirements, lifting arrangements and all the other specifics. I wouldn't waste your time trying to figure out this out because each precaster has their own preferences when it comes to panel sizes, lifting hardware, and manufacturing. Whenever consultants have tried to do so for my clients projects, they get it all wrong and it usually ends up in more discussions than necessary.

Brad

 

[rscassar]

Normally a performance specification would be provided by yourself to the design and construct contractor. Even if they are architectural features, as the EOR I would be wanting to make sure the fixing details are submitted and certification has been provided for the wall panels.