Masonry Anchorage
Masonry Anchorage
(OP)
Does anyone have literature on anchorage into masonry that is not fully grouted?
I'm planning on adding masonry anchors to an existing CMU wall and am only planning to grout the cores at the anchor location. The entire wall is not grouted.
In the absense of literature I will use the mortar shear on the CMU faces and any moment forces from the anchor being eccentric to the block face to give me a maximum 'block' pull-out force (friction neglected). Any comments on this approach?
Dik
I'm planning on adding masonry anchors to an existing CMU wall and am only planning to grout the cores at the anchor location. The entire wall is not grouted.
In the absense of literature I will use the mortar shear on the CMU faces and any moment forces from the anchor being eccentric to the block face to give me a maximum 'block' pull-out force (friction neglected). Any comments on this approach?
Dik






RE: Masonry Anchorage
That sounds about right to me. That’s basically been my thought process on these types of masonry anchors. I’ve grouted adjacent cores and several courses deep (high), in running bond lay-up, to key more CMU’s together and bring them into play. I’ve considered the shear and bond in the mortar joints, but that won’t really bring the next block into play in a bending or tension condition, and just barely in shear, so be careful. They really have to be keyed together through grouting to make 3 or 4 CMU’s act together as a unit. I’ve often wondered about the 7" A.B’s., at the sill plate, in wood frame construction. They grout one core, one course deep, maybe; sometimes the small middle core in some blocks, saves grout, and expect to provide shear and uplift strength. Half the time, if you had a little more finger strength you could lift that top block right out of the wall.
RE: Masonry Anchorage
Still 'scratchin' my head on this...
Dik
RE: Masonry Anchorage
RE: Masonry Anchorage
RE: Masonry Anchorage
RE: Masonry Anchorage
RE: Masonry Anchorage
Dik
RE: Masonry Anchorage
RE: Masonry Anchorage
SteveGregory...doesn't do any good to specify an unavailable product, approved or not. If HY70 hasn't gone through the process of approval (which is not likely since it is on the market), then request a letter from Hilti stating that HY70 is equivalent to HY20 in all pertinent respects. Spread the joy...er, liability!
RE: Masonry Anchorage
I like Hilti's composite 'screen sleeve' for hollow block, but the pull-out loads are too small... going to 'glue' threaded rod into filled voids or use some other mechanical anchor...
I'm not so much an ICC type of guy... I often encounter issues that have no prescribed solution... my favourite type of engineering.
Dik
RE: Masonry Anchorage
Dik