Would a #5 rebar in the front cell of the Omni Block provide the same structural strength as using on #5 in the Insultech 5x5 core?
Or would you have to run some engineering calculations to determine if this is the case?
The Omni block shows placing 2 bars in the 2 ½” core holes front and back - - but the question is, can we eliminate the #5 bar in the rear core hole and still achieve the same structural strength as the Insultech block using one #5. The core hole being so much smaller with the grout, we were thinking that this probably would not provide the same strength? What are your thoughts as a structural engineer?
No, The #5 does not provide as much strength because the distance between the center of the bar and the compression face of the masonry is not a far and the strength depends on that. However, the bending strength in the other direction is considerably more. Alternating the side that the steel is on could make a big difference in the overall bending strength when checked in both directions.
Jerry Painter, FASTM
Don Beers, PE, GC
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