Attaching to an existing Masonry Wall

[strguy11]

I have a new floor system that I wish to attach to an existing masonry wall. Is it possible to install a bond beam, or grout horizontally into an existing wall, to create a new bond beam for the attachment?

My thought was to attach a ledge angle, but based on the loads, I need to attach to a solid wall. This new floor is at a different elevation than the floor on the other side of the wall, so I know I wont be at a bond beam. Also, the existing wall is reinforced vert at 48" oc, but my loads require the attachment to be at 24"

Any ideas?

 

[JLNJ]

Can you through bolt?

Grouting the cores solid is possible but it might be costly and difficult to verify.

 

[strguy11]

No, Cant thru bolt, because it would be visible on the other side of the wall.

 

[hokie66]

If the wall is otherwise adequate for the existing and new loading, just knock out the sides of the blocks, form it up, and pump in grout. Not all at one time, of course.

 

[lkjh345]

Can you use something heavier than an angle to span the 4'-0" between existing reinfoced cells? Say a channel?

A C10 or C12 would allow you to get two rows of anchors in at 4'-0" o.c. instead of 1 row of anchors at 2'-0" o.c. Should give nearly the same anchor capacity.

Would need to field verify which existing cells are grouted prior to fabricating the holes.

Just an idea.

 

[ChipB]

You may have already known this but just in case:

You are not allowed to increase the stress in any existing structural element by more than 5% w/o bringing it into compliance with current code. I'd be willing to bet you've exceeded that 5% just in Dead + Live. If you have any seismic involved....ouch!

You can't by chance make it self supported can you?

 

[MiketheEngineer]

Can you build a stud wall - wood or steel next to the existing wall and simply support on that? I would imagine that the floor slab already sets on the footing and the footing will carry the extra load.

 

[K2skis]

Not sure how much load we are talking about here. I have used screen tubes and epoxy bolts in hollow block many times. This way design for the hollow block condition and if they hit a grouted cell simply omit the screen tube and use a straight epoxy bolt.