Thanks for the responses. That's about what I thought. They usually use epoxy coated rebar in all their concrete, so I told them they could probably use uncoated bar and save a few bucks but otherwise there probably wouldn't be much different. But I thought I would ask in case I was just...
I have been asked to design some foundations and buildings for an industrial project with an expected 10-year life. Is it possible to do anything differently for this shorter life project than it would be for a standard expected life design that would reduce the construction costs? Other than...
I am writing a grouting spec for baseplates and have been reading the resources I can find to do so. In everything I have read, it says that when grouting in cold weather, you need to heat the area, foundation, etc. before and after grouting to allow it to cure properly. Then the resources I...
This is a good resource for grouting information: http://www.fivestarproducts.com/index.php/fileuploader/download/download/?d=0&file=custom%2Fupload%2FFile-1399650344.pdf. If the link doesn't work, just google "A professional's handbook on grouting and concrete repair".
It is obviously written...
Some of this has already beeen addressed, but I will just add my understanding to the conversation as well.
Question 1: Modern day compaction equipment can compact soils to the modified proctor density values with reasonable effort. Modified proctor densities are generally called out these...
No, I am not in R&D, so you don't have to worry about anything blowing up because of my "dangerous" methods.
However, if you think that simplifying hard to analyze problems into easier to analyze problems that give you approximate but safe answers is not engineering, you are wrong. Almost...
I think you'll find that most people on this forum are a lot more practical in how they would approach a hard problem then a professor at a university might be. Most of us wouldn't bother to derive the exact formula when an approximate analysis that is a little conservative will get us by in...
I'd add a vote to use a braced frame. I'd also echo someone above who said to watch deflections. It is going to be hard to get enough separation to avoid interacting with the building during an earthquake with a cantilever column. Typically you would have to evaluate the drift on the building...
I had considered straps to the sides of the stem wall but was worried about corrosion. Do precautions other than galvanized strap or something need to be taken? The top of the stemwall in this case goes down 4' or so but the top is only 6" above grade and it would be hard to regrade the area...
I have found myself trying to get some post-installed anchors to resist uplift in existing foundation stem walls many times over the years and it is always hard to do. The numbers from ACI 318 App. D just don't work out to where you can resist more than 2500 or 3000 lbs in tension or shear...
The pictures are hard to get an idea of depth, but there was about 2" of cover between the pan and the rebar. The corrosion is from all sides. There are spills of chorides on top and chlorine vapors in the air underneath.
I have some pictures of the top and bottom surfaces of the floor failures.
This first picture is some cracking on the left and rough worn areas on the right that are more in the travel path (top surface).
This turns into more rutted areas over time like the picture below.
Then this turns...
I will get some pictures on Monday. The slab is supported by steel beams ranging in size from W21x44 (16'span) to W36x135 (29'span). From the construction drawings it appears to be a composite beam design, but from experience, I have caught our concrete guys not putting studs on when they were...
