Through bolts in CMU
Through bolts in CMU
(OP)
Does anyone have any source or a good methodology for the capacity of a threaded rod (or bolt) placed through a masonry wall with a washer or plate on each side?
I'd be interested in it for both grouted and ungrouted CMU (and with Appendix D creating issues in concrete the way it is, it seems like we could use it in concrete also). We typically just use epoxy or expansion anchors for grouted.
The ungrouted situation happens frequently in existing buildings where it's a guessing game as to whether or a not there's a horizontal bond beam at the height we need and it's usually not for a large load. I just can't find anything on this issue on the net or in my own library. It seems like there should be an approach that considers the dowel bearing strength for shear and a bearing and possibly a punching shear type of failure for tension, but I'd feel a lot better with some written source backup.
This had to happen all the time before wedge and epoxy anchors became available, no?
I'd be interested in it for both grouted and ungrouted CMU (and with Appendix D creating issues in concrete the way it is, it seems like we could use it in concrete also). We typically just use epoxy or expansion anchors for grouted.
The ungrouted situation happens frequently in existing buildings where it's a guessing game as to whether or a not there's a horizontal bond beam at the height we need and it's usually not for a large load. I just can't find anything on this issue on the net or in my own library. It seems like there should be an approach that considers the dowel bearing strength for shear and a bearing and possibly a punching shear type of failure for tension, but I'd feel a lot better with some written source backup.
This had to happen all the time before wedge and epoxy anchors became available, no?






RE: Through bolts in CMU
RE: Through bolts in CMU
RE: Through bolts in CMU
It would seem like you would just easily take a punching shear cone radiating from the edges of a large plate like you would with concrete and use this cone area in ACI 530 equation 2-1, but I can't find such a technique explicitly mentioned in the code. You would also check bearing under the plate on the face shell.