Interesting, thanks hokie66. Found this link:
https://constructionqueries.wordpress.com/2014/11/17/bending-backwards-for-bent-up-bars/
Without details, I don't think I would count on it, but that leads me to believe that there may have been some fixity expected at the ends and the slab may be...
I am evaluating a concrete floor in a building constructed around 1952. A snip of the slab schedule is attached. It indicates "Bottom Bars" at say #4@10" then the next column says "Bend Up" and what looks like 1/2? Does anybody know what that means? There are no sections that show the...
One of the concerns to be aware of when trying to analyze joists is the length of the weld provided at panel points and other locations, and it is not adequate to only measure one weld or assume a full length weld. Field verification of each weld would be required to ensure capacity, as I was...
Can anybody tell me what this welding washer is on the attached image, and what is it supposed to do?
I'm guessing it is supposed to facilitate shear transfer between the concrete and the...
What is a direct spectra-to-spectra method?
I am working on an equipment platform on a Risk Category V structure, and am working on developing an in-structure response spectra, however the UFC states "In the application of ASCE 4-98 Section 3.4, those provisions that relate to...
I am performing a Tier 2 evaluation of an existing structure and I have a question about determining whether a component is force controlled or deformation controlled. I feel like I am just getting too bogged down in the interpretation of the text.
Am I to assign whether a component is force...
This is true, dhengr. I don't know the material strength, or the capability of the previous clips to bite into the strut and provide the same lateral resistance. Considering these electrical cables were the main service for the entire building, I felt more comfortable going with the tested...
I agree JStephen. It seems that there is one fabricator for these clips, and they get passed to different companies to be stamped and distributed. If that were true, I would think they would have the same capacity but one company paid for testing the other did not. Of course, that is an...
Yes. The new straps that replaced the old straps are manufactured by B-Line (or Cooper Industries, or EATON, or whoever they are now-a-days) and have tabulated design loads. I am confident that the new straps have adequate capacity for the application.
I was tasked to provide details for seismic bracing for some electrical conduit runs. The situation I walked into was the new conduit had already been installed and was supported by trapeze hangars from the concrete slab above. I asked for information about the existing supports: size and span...
Yeah, that's the one thing I can't be sure of. I haven't yet looked into finding information about the wind speeds experienced over the last 20 years compared to design speeds. It could certainly be possible to experience a higher wind speed in the next 20 years and exceed the loading...
I considered the repair option but I get back to the same situation because the rebar would likely have to be “repaired” (replaced) since a lot of it is rusting out. Again I am in the situation where I am putting that detail on my drawings and signing off on them. Is that any different?
I...
Is it foolish to copy a design that appears to have worked satisfactorily for 20 years? Or is it foolish to create a new design that costs roughly 10x more to “ensure” it works? (just playing devil’s advocate)
Again, this is a fence out in the middle of nowhere… literally. I wouldn’t...
I have seen several of the manuals produced by the Permafrost Technology Foundation and they are usually very good. I have quite a bit of experience designing in permafrost conditions. To get your PE in Alaska you have to pass a class in Arctic Engineering which coveres all these topics...
I considered the option of detailing repairs for all the individual types of failures, I even wrote up a narrative explaining all of the details; I decided against that for a few reasons. The shipping costs go up even more if you consider shipping out materials in several smaller packages. The...
