Bondek slab to RC wall connection

[0R123]

Say I have one-way bondek slab connection to a core wall, which is the only lateral resisting system as below.

I am wondering what is the recommended connection for bondek to wall? If I use the left one then the EW walls (in red) will not connect to the bondek as it is one way, is it okay for lateral? Can I use the right one which is used for normal RC wall to RC slab? Thank you.

 

[r13]

Use the detail "on right" for the NS walls (support for one way slab), and the left for the EW walls, which require connection for shear only.

 

[rapt]

I would not use either detail.

 

[0R123]

For the EW wall, won't the use of angle introduce the load transferred to walls?

What connection do you recommend then? especially for lateral concern.

 

[r13]

OR123,

I don't want to get into your details. Basically, as one way structure, the slab is bear on the NS walls, and it can be connected to the EW walls through simple shear connection. Note that the former is a structural/strength connection; the latter is a compatibility joint/connection.

 

[Agent666]

I wouldn't ever do the right detail. Might as well leave the reinforcement out of your wall to achieve the same continuity for the wall reinforcement implied by that detail.... Probably what rapt was getting at..

 

[0R123]

Thank you r13.

Hi Agent666, can you please tell me the reason behind it?

Sorry but I dont get what this mean. Can you please elaborate?

 

[Agent666]

Your vertical wall reinforcement is discontinuous as drawn.

 

[0R123]

Okay thanks.
Sorry I didn't draw it properly. Simply put, I will continue my vertical bars from lower wall to a lap length over slab and lapped with upper wall reo and then provide 'L' bars from either lower or upper walls and cog into slab. My main question here is, this kind of details is used for normal in-situ slabs, can I use this it for bondek or other composite deck as well? I am asking because I have seen the left one being used more often. But maybe that is because the they use precast walls? Is this detail reliable to transfer lateral loads? Thank you.

 

[Agent666]

Yes, any appropriate detail used for insitu slabs is also appropriate for a composite deck. The difference is the angle to directly support the deck obviously, or consideration of the lost wall thickness if you're supporting it within the wall thickness. Typically, you would see a steel angle though or concrete corbel (less common).

 

[0R123]

Ok. Thank you very much.

 

[rapt]

OR123,

Agree with your new description of the second option with continuous wall bars and top/bottom slab bars.

With metal decking, it is important to have bottom bars into the supports as the decking does not develop into the support.

With the angle detail, how is it fire rated? Drilled and epoxied bars into the wall are not going to develop much connection unless it is a very thick wall. And the detailing of the bolts to transfer the forces to the wall is always a problem.