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Thank you, both. TLHS, I'll have a deeper dig through Vulcan Hammer - some of their documents came up by web search (like the circular cofferdam manual) but I didn't find anything for this type of structure. I have turned up some European guidance but it's a bit light on seismic. I also don't...

Hi TLHS, it's the wall of a harbor basin - waves outside, boats/small ships on the sheltered inside, vehicles and cranes on top. I might not have explained well the first time. The two sheet pile walls run parallel about 30 feet apart (TBC). They are tied together near the top with anchor rods...

I'll give this a bump before trying the retaining walls forum.

Hello Can anyone help with a U.S. design manual for double wall sheet pile piers? This will have water on both sides, not a dry work area on one side. Loads will be gravity, waves, boats and seismic. I've designed sheet pile walls before but am sure that double wall structures have internal...

I'm new to reading the IBC code. When it gives acceptable solutions like quoted by OP, does that mean other solutions aren't acceptable? It doesn't seem to say that in the main section, but the wording of the "Exceptions" seems to imply requirement rather than example.

Assuming this reason is not valid, Engineer A nonetheless provided a reason during the approval/review process. This moves the needle from ethics to technical error IMO, with the onus on you to prove nefarious intent if you want an ethics violation to stick. Despite knowing these were in no...

We might be on the same page but I'm not 100% sure. I think you used those quote marks to indicate a direct quote from the FEMA guideline, but they're actually ironic air quotes in this case since FEMA waived the requirement. This needs to be done in the consideration of Engineer A's...

Sure, but as it stands there isn't proof that public safety is compromised. Even with FEMA's revised analysis (yet to be completed), there will just be two competing results that were derived using different methodologies.

That's fine as a general statement and aligns with the FEMA guideline. A proper case study, however, should delve into the fact that the two authorities involved both waived the requirement in this particular case. The duty of care question is probably also a can of worms. Engineer A clearly...

I think your pursuit of Engineer A is going to need to delve into the details of the analysis rather than procedural, unless you have other nuggets of information still to drip-feed. First, whether the parameters used were unreasonable. Even so, that on its own would just show error/negligence...

I wonder how much of your time investment is because you always try to discuss in generalities (which will never yield a conclusion)? Aside from your posts on this forum, your email to the NSPE about the definition of "client" could only ever come back as "It depends..." because you didn't give...

I meant that the concrete code should have comprehensive provisions for slender and unbraced columns even if most concrete columns aren't slender and/or are braced. As it stands, I believe that two real effects that may be significant in some circumstances aren't included (and one of them is...

Thanks for the discussion. I don't think so either but am starting to think that being taught steel design, and concrete design, and timber design isn't the best way. The earliest subjects were structural engineering overall but looking back we hardly needed a researcher on the cutting edge of...

Thanks hardbutmild. I didn't say it, but I was think about US concrete design. As far as I'm aware, the columns not being perfectly straight is only allowed for in the moment magnification procedure for the minimum moment. If the minimum moment is not applicable, there's no explicit...

Thanks for the replies. I don't blame you for the lack of understanding. I'm having trouble framing the question because I'm grappling to understand the issue. I'll try a picture. Before notional lateral loads, my understanding is that the unbraced effective length factor was used to account...

Hi all, I'm trying to understand the difference between steel and concrete design for buckling, specifically the 'column curve' for steel when applied to unbraced frames. Here's how I understand the two design processes: 1) Both steel and concrete design use lateral loads to simulate the...

I would state it somewhat the other way around. Analysis at allowable load level doesn't demonstrate that the target resistance to overload has been achieved.

This is a good explanation of the different methods, from the engineer who led the introduction of direct analysis to the code: https://www.youtube.com/watch?v=iOH6kaXX3Mk&list=PLvJE8_LjpVk35oVNRd9OQj6tg0vbl-34b&index=9 Q1. Software is the easiest way of doing the direct analysis in this day...

I think it's useful to compare various levels of analysis (levels of sophistication). I'll put them in this order: 1) Hand analysis (from the video). 2) Linear buckling analysis (mentioned in the initial question). 3) Direct analysis (from the video). 4) Advanced analysis. I'll assume good...

Littlewheels, I don't have access to those standards. Decided against buying them because I figured another standard wasn't going to help. I went to a university library instead and found a book that confirmed those three criteria apply. Seems to be a difference between US practice in the web...