Masonry Wall On Steel Beam Top Flange

[wubwub]

Not being involved with masonry too much in my career, my knowledge of details for masonry connections is not a lot. My specific situation involves supporting a 8' cavity wall (8" CMU + 4" brick) on a steel beam spanning a 12' opening where there is no wall on one side of the opening for bearing. There is also a wall coming in perpendcular and there is a 8' opening below the wall . Basically the two walls would meet at a "corner" and be supported at the corner by a post.

My first thought was to just use a precast beam on top of the steel columns to span the opening, but for a myriad of reasons I won't get into here, the architect wants to use steel beams and columns at the corner at this spot. I also thought about welded steel bars to the top flange of the beam extending upwards to anchor the bottom course or courses to the beam.

Just putting a plate on top of the steel beam and resting the cavity wall on top would not seem to give any anchorage for the wall. I've sized the beam to get a deflection of less than l/600, but my request is does anyone know of a detail or where I can go to get some typical details of attaching a cavity wall to the top flange of a steel beam to get the proper anchoring needed at the base of the wall?

Thanks in advance for any help anyone can provide.

 

[csd72]

I assume this is a seismic zone, and that is why you are worried about anchorage?

 

[wubwub]

I am in Seismic Design Category B for this location.

 

[vincentpa]

Does the architect want the steel beam exposed? If so, a plate on the top flange is ok but I would weld 1/2" studs at 32" o.c. to the plate and grout the those cells solid and weld studs at top flange above where the beam bears. I would also use ladder joint reinforcement for 2 courses above the lintel for crack control. If the architect wants the beam covered, put the plate on the bottom flange to pick up the masonry face shells and weld the studs directly to the top flange of the beam. At the masonry wall, bear the beam on a plate and weld it. The plate should be anchored to the wall with (2)-3/4" bolts minimum.

 

[jike]

If the wall has vertical reinforcing, then, use dba's or thrd'd rod welded to the lintel to lap with the vertical rebar in the cores.

 

[wubwub]

Thanks vincent pa and jike.

Yes the architect wants it exposed. The details I came up with is similar to what each of you suggested. I basically welded a rod to the plate on the top flange to develop with the reinforcement in the wall and have the horiztonal reinforcement (which I am using anyway for the cavity wall) for the cavity wall in the first two courses above the beam. I think I will go with this for now unless I can think of something else or find something else for a situation like this that is more typical.

I also have a call into a couple of my masonry subcontractors to see if they have any ideas or have run across this situation before and there is a detail they have seen before that will work and might be easier. I will post them if they are good alternatives to above.

Thanks again.

Thanks again.