I don't think a 4" slab on grade in a residential unit is really considered "structural" and therefore it probably doesn't actually have any reinforcing requirements. Since a slab on grade is continuously supported by soil, the plain concrete chapter in ACI 318 could be referenced but again, if...
I've always used continuous blocking but you are correct that providing the required amount of ventilation can be tricky with a large roof and shallow heel. Are the trusses at 2' oc? If so, I think leaving a block out every 4th bay would still meet the continuous attachment intent. Really, as...
A client has asked me to provide structural engineering for a detention vault. It's roughly 28' x 35' x 8' tall. The vault will be cast in place concrete with a hollow core lid. However, in order to accomodate a fairly large access door, one strip of the vault lid will likely be mildly...
I almost always spec rebar in residential slab on grade applications. #3 @ 12"oc meets the minimum temperature reinforcing requirement of 0.002 * Area for grade 60 bar. I also leave a note for wire mesh specs in my general notes so that when the contractor calls and requests a substitute there's...
ExcelEngineering,
I have used LVL's in this scenario because LVL's and the existing joists are both dimensionally stable. Green lumber from the lumber yard, even if it is kiln dried, is not necessarily dimensionally stable. When you sister a joist along side an existing joist you typically...
BAretired,
I should have read your last post closer. Your recommendation to sister something along the bottom of the joists to increase the section properties is what I was getting at with the idea of adding a 2x6 to form a T-section.
I figure LVL material and old, well seasoned sawn lumber...
Hokie66,
I was wondering about that. The scope of work is to re-roof the building. That should stop any future water infiltration, at least until the roof membrane fails sometime way into the future. My concern is that the bar is rusted on all sides and by only cleaning the exposed side it...
Bookowski,
If I understand you correctly, you are sistering joists the same way that I usually do in similar situations.
1. check shear of original joist to ensure that it can support the full load at the support.
2. sister new joist alongside existing joist, size connection along length of...
Thanks for the input bridgebuster.
I ended up purchasing a copy of ICRI 310.1R-2008. It gives a fairly simplified overview of concrete repair along with recommendations about clearance distances between concrete and damaged rebar during repair. I'm also using ACI 546r-96, which has much more...
I'm looking for a source for generic spalled concrete repair details. At a former firm I remember a reference manual that had some isometric drawings showing how to remove the concrete around the corroded bar and how to clean the bar up and patch it. It also gave recommendations for the repair...
