Steel Lintel in Masonry Wall - Seismic Details (ACI 530)
Steel Lintel in Masonry Wall - Seismic Details (ACI 530)
(OP)
I'm interested in the ACI 530 code requirements for steel lintel anchors into masonry (CMU) walls.
ACI 530 Chapter 7 Seismic Design Requirements 7.3.2.8.1 states:
Horizontal reinforcement shall be provided at
the bottom and top of wall openings and shall extend at
least 24 in. (610 mm) but not less than 40 bar diameters
past the opening.
I have seen many details of masonry bond beam type Lintels with lintel reinforcement extending beyond each side of masonry opening 40 bar diameters or 24 inches, whichever is greater.
However, all the steel lintel details I've seen have a bearing plate, and two grouted in place anchors in the CMU cell that the steel lentil is perched on. Where are the requirements in ACI 530 for the design of steel lintels, considering special seismic detailing? I haven't seen anyone include the above reinforcement extending past the openings for steel lintels?
ACI 530 Chapter 7 Seismic Design Requirements 7.3.2.8.1 states:
Horizontal reinforcement shall be provided at
the bottom and top of wall openings and shall extend at
least 24 in. (610 mm) but not less than 40 bar diameters
past the opening.
I have seen many details of masonry bond beam type Lintels with lintel reinforcement extending beyond each side of masonry opening 40 bar diameters or 24 inches, whichever is greater.
However, all the steel lintel details I've seen have a bearing plate, and two grouted in place anchors in the CMU cell that the steel lentil is perched on. Where are the requirements in ACI 530 for the design of steel lintels, considering special seismic detailing? I haven't seen anyone include the above reinforcement extending past the openings for steel lintels?






RE: Steel Lintel in Masonry Wall - Seismic Details (ACI 530)
1) I bet, under seismic, most of these steel lintel openings crack to high heaven at the corners.
2) I suppose you could pseudo apply the provision by putting rebar above the opening and extending it appropriately. Not ideal but some containment.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Steel Lintel in Masonry Wall - Seismic Details (ACI 530)
Thaidavid
RE: Steel Lintel in Masonry Wall - Seismic Details (ACI 530)
Might be overkill, but meets the intent I would say.
With that said, I never try to use a steel lintel unless I have to. I don't like mixing materials if I can avoid it plus helps avoid thermal bridging on exterior walls.
RE: Steel Lintel in Masonry Wall - Seismic Details (ACI 530)