Vertical rebar of CMU

[dewins]

Can somebody remember the ACI code stating that vertical reinforcement shall be anchored to roof beams or structural beams. We would like to know because the EPC contractor just wanted it to have angular plate and anchored with drive pin.

Thanks for the help.

 

[hokie66]

You won't find a requirement in ACI like that. But then, what the contractor wants to do doesn't sound acceptable...a better description or detail might help in providing advice. What is EPC?

 

[TXStructural]

If the structure was properly designed, this information would be on the drawings. If it was not properly designed, and the contractor doesn't know common practice, don't build the building. What you are describing is not common practice for a structural element. If it is an infill wall without structural purposes, the contractor still needs to attend to some details to prevent future problems, and it is not just as simple as "fill in this hole with block."

 

[SteelPE]

I don't quite understand the terminology as wall... EPC? Also, what do you mean by driven pin? There are post installed anchors that are sometimes used such as a Hilti Kwik Bolt. Is this what you are referring to as a driven pin?

 

[fegenbush]

EPC = Engineering, Procurement, and Construction

 

[JLNJ]

EPC = engineer, procure, construct?

drive pin = powder actuated fastener?

angular plate = angle fastened to bond beam sill at beam (or maybe joist) bearing?

 

[a2mfk]

Who cares what the contractor says, what does the structural engineer who did the drawings say?

As always, a sketch of photo would help immensely.

 

[dewins]

guys, please refer on the attached drawing. thanks.

 

[hokie66]

With a concrete beam or slab bearing on the wall, extending the reinforcement into the slab with a 90 degree hook is common practice. Depending on the depth of the slab, you may not need the hook.

 

[a2mfk]

Agree with Hokie. In Florida due to high wind uplift we always use hook bars into the bond/tie beam. You say fill mortar, maybe that is just the terminology you use but usually this is grout (concrete). I don't know if a "drive pin" is the same as a powder actuated fastener (PAF), but I would not use that in this application. If this is CIP concrete beams and slabs, normally you would extend some reinforcement into the tie/bond beam, or hook bars would extend out from the tie/bond beam into the roof beams and slab. If the "top anchor" is a continuous shelf angle or similar, I would normally use expansion or epoxy bolts for this connection.

 

[concretemasonry]

The sketch provided is a little questionable.

A properly detained masonry wall would have a bond beam (1 or 2 courses) and the vertical steel would be surrounded by grout and not mortar to insure continuity with the bearing wall.

Dick

Engineer and international traveler interested in construction techniques, problems and proper design.