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  • Users: hemiv
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  1. hemiv

    Weld Callout Leader Direction

    I like this idea, but have never encountered before in the wild! I may start using it myself, because I like a clean and well-prepared drawing, but as a design engineer I wouldn't expect a welder to pick up on this intent. If I really care about it, I spec it out in writing on the drawing.
  2. hemiv

    Unconstrained Bollard Design Check

    You can design the bollards as either unconstrained or constrained. But for both cases, if you design the bollards to withstand that impact load with minimal deflections, you will end up with unrealistically large foundations. Not to mention injure the driver of the vehicle! It would be like...
  3. hemiv

    Retaining Wall Inspection Criteria

    If the structure was just built and is already deflecting, then that's a problem. If the structure was built a long time ago and is deflecting, it may be okay. Deflection may be especially visible if it's a cantilever wall. It may mean some theoretical overload has happened, or creep from forms...
  4. hemiv

    Unconstrained Bollard Design Check

    Is there a very special need for this bollard to remain in place after such an impact? If this is for a typical parking lot or warehouse bollard, it is normal to assume foundation failure in the event of a collision. Bollards tend to function primarily as visual warnings, and secondarily as a...
  5. hemiv

    Options for attaching checker floor plate to HSS beams

    Thanks for the options, everyone. It is very helpful! I'll have a talk with the client to see what kind of performance they are looking for. All else being equal, I like the screw option. Thanks for the detail HTURKAK!
  6. hemiv

    Options for attaching checker floor plate to HSS beams

    I didn’t realize self-tapping screws were an option for this thick of material. The decking is min 1/4” and the HSS is 5/16”. I’ll certainly do that if it’s an option. What about “sidelaps,” as in fluted metal decking? Does this get spec’d or is the plate typically cut for bearing on all edges?
  7. hemiv

    Options for attaching checker floor plate to HSS beams

    I have inherited a project where 5/16" HSS is being used for an industrial platform which will be decked in checker plate. The HSS is already purchased. The previous designer had the floor plate field welded to HSS in overhead position. This is a hell of a lot of overhead welding, and think...
  8. hemiv

    Existing Slab w/ new basement retaining wall addition

    You will want to account for the weight of the slab and live loads on the slab, as well as reactions of any footings near the wall. Check out the California Trenching and Shoring Manual for a good reference on how surcharge and live loads affect soil pressures. And check in your foundation...
  9. hemiv

    Min reinforcement steel in foundation for self erecting crane

    I worked for a large heavy civil contractor, and we would, as a rule, take advantage of the temporary nature of our projects. We made use of ASCE 37. I am not familiar with Eurocode. If the foundation works for the loads, and if the As min is just there for crack control, and if you can live...
  10. hemiv

    Steel Beam to Wood Post Connection

    The end plate is cheap. I would specify it regardless. I would also prefer to connect directly to the post, but I agree for light loads it probably doesn't make much difference.
  11. hemiv

    Sawcut control joints in formed concrete?

    I agree. The point is that it is very hard to get this pool of contractors to look at the drawings and specs, and then not cuss you down the road if they finally do. And I find it's a crapshoot if the homeowner will notice or care. For non-life safety issues, I end up feeling like I'm talking...
  12. hemiv

    Sawcut control joints in formed concrete?

    Thanks, those are my thoughts. This is a residential project, and in my rural area these home contractors just don’t know what to do with a set of plans and specs.
  13. hemiv

    Sawcut control joints in formed concrete?

    I've got a contractor that may not have placed control joint strips in his forms for a cantilever retaining wall... I don't believe I've had this issue before. Can joints be cut in after forms are removed in 2-3 days? I'm only familiar with slabs, and they of course get cut very soon after pour.
  14. hemiv

    One Drive - Am I the Last Person Using Dropbox for Business

    I feel the same. I also use Protonmail for email for that reason, as well. End-to-end encryption is a basic requirement!
  15. hemiv

    One Drive - Am I the Last Person Using Dropbox for Business

    Dropbox has had some security issues, so I switched to Sync.com. One architect I know uses Google Drive. The rest seem to use One Drive. IMO - this is less about One Drive being good as it is about it being conveniently bundled with your Microsoft subscription (or hosting).
  16. hemiv

    Truss Question - Sanity Check

    I don't see any problem. Trusses often have idealized pins at the web-chord nodes, anyway! Should be good as long as the forces can be transferred through your connections, which may need to be strengthened a bit beyond a typical clip or shear tab.
  17. hemiv

    Shou Sugi Ban procedure

    I've encountered it in the timber framing world - you may find some more information through the Timber Framers Guild.
  18. hemiv

    Combined Wood and Steel Moment Frame

    I am working on an existing structure from the 80's which used steel tube columns and doubled light wood trusses designed for end moments. The columns have big flag plates welded to the top, and the top and bottom chords of the trusses are bolted to it. We have to modify this structure. We are...
  19. hemiv

    Firm Principals and Liability

    Thanks all. The insight is helpful. Yes, for clarification this is a multi-disciplinary firm and I am the structural guy.
  20. hemiv

    Firm Principals and Liability

    Is it possible for principals of a firm to be considered liable for errors or unethical activity of another principal? I’ve got a situation where I believe a principal is practicing outside of his expertise (and encroaching on mine). On the one hand, surely he is solely responsible since he is...

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