Importance of S-shaped links in core wall

[ABA102]

Hi,

In design drawings, the designer did not specify s-shaped links inside inner and outer vertical rebars.
That, I have doubt if these links should be required in site installation. May I ask to the experts in core wall design, the importance of s-shaped links to be tied in between inner and outer vertical rebars of lift core wall.
Our project location is in the middle east and only 2B+G+3 storey building but the lift core wall starts from basement-2.
Thanks in advance for your insights.

 

[hardbutmild]

I'm having trouble with the terminology so could you explain what do you mean when you say "inner and outer vertical rebars". I think that a drawing (at least the problematic detail) would explain everything. What does "lift" mean? Like, the core wall is used as an elevator shaft or something else?

 

[hoshang]

Hi
Please find this link:

https://www.buildinghow.com/en-us/Products/Books/Volume-A/The-reinforcement-I/Shear-walls/General

 

[r13]

How is the intensity of earthquake in your region/local. S link is required for seismic detailing.

 

[KootK]

1) The final determination on this should probably be made by the designer herself. That said, if the absence of the links strikes you as atypical for your region, that absence may well be an error that the designer will thank you for bringing to her attention.

2) Whether or not the links are required may be a function of a number of things:

a) The compressive stress levels developed in the wall and whether or not the reinforcing has been designed to help out with those stresses.

b) The level of ductility required of the wall.

c) What the codes and standards that apply to this project have to say.

 

[hokie66]

KootK is correct.

hardbutmild, ABA102 apparently comes from an area of the world where the word "lift" is used instead of "elevator".

 

[ABA102]

@ hardbutmild.
Yes hokie66 is correct.
Here in middle east they normally use the term LIFT instead of ELEVATOR.

@ retired13.
To my understanding, no seismic consideration. However, please clarify if S link is required only for seismic?

@ KootK.
Thanks for you insight.

 

[ABA102]

@ hoshang.
Thanks for the info. I have also read that article before but I want to know if, links are still required even if there is no seismic consideration in the design?

But for additional info, I have attached herein the reinforcement detail drawing.

 

[r13]

I am positive on S link is required for seismic detailing of shear walls, but I cannot say it is the only case. You need to check the local building design code for requirement.

 

[hardbutmild]

If no seismic design is required, then this looks okay, other than the fact that during construction I don't see this holding together without S links, or some other form of reinforcement.

 

[KootK]

To my understanding, no seismic consideration. However, please clarify if S link is required only for seismic?

1) The ties are more likely to be necessary in high seismic applications.

2) The ties may still be required in low seismic applications. In ACI jurisdictions, you will also need ties if:

a) the bars are being utilized in compression AND;

b) the reinforcement ration is higher that 1%

3) This is still a question to be asked of the designer in my opinion.

 

[ABA102]

@ retired13
@ hardbutmild
@ KootK

Thank you for your informative replies.

 

[r13]

You are welcome.