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  1. DwayneM

    Construction Joint in Columns

    The columns are main supports for a 2-story commercial structure. The rings are to attach steel framing (w18's, mostly) to the concrete columns. (For example the steel W framing at the second floor level or roof level). Loads are primarily compressive (shear at the face of the cylinders), with...
  2. DwayneM

    Construction Joint in Columns

    Hey y'all, In placing columns (26" and 48" dia) with embedded steel rings w/ studs (See Figure), it's necessary to break the concrete placement into two placements, possibly with as much as an hour between the two. Where would you recommend they break the placement, and why? Would it matter...
  3. DwayneM

    Culvert Design

    Steel, Are you planning to stamp this design? Seems to me "the civil engineer" should be able to give you some guidance on expected scour depth - or for that matter the maximum elevation of the bottom of the footing.
  4. DwayneM

    Received an offer to leave present employer

    Update - if anyone cares... Some if the situation above is hypothetical, based on some side discussions DB and I had with a bit of my own supposition thrown in. (For instance, I doubt my MN contact would ever leave MN, and I'm to insecure to go solo.) As I've been looking at options with other...
  5. DwayneM

    Received an offer to leave present employer

    Thanks LA Cajun... That is a more structured option, as I've been getting a positive feel from my contact at MN. I may look into hiring on with MN - likely in the same dept. or supervised by my contact. While I'm confident DB is good at scaring up work (he got a bunch for TS) that is not my...
  6. DwayneM

    Changing recommendations in report to suit client

    I think photoengineer's on the right track there, since (a) chances are the manholes are the same age as the adjacent pipes, and may not last through an entire life cycle of the pipes, (b)replacing adjacent pipes would require quite a bit of work on the manholes which may damage the connections...
  7. DwayneM

    Received an offer to leave present employer

    I'm considering backing away from this situation, advising DB that I'd like to continue to work for MN through TS. If MN doesn't go for that, or if things dry up to where TS let's me go, I'll approach DB and see if the offer still stands... any thoughts?
  8. DwayneM

    Received an offer to leave present employer

    Thanks all for the buffet of food for thought. More advice is welcome.
  9. DwayneM

    Received an offer to leave present employer

    Thanks to all of you for your insight. I agree with many of your points, and I do plan to be upfront with all parties as I decide my course of action. A little further explanation: - The potential new partnership would also include the employee of MN whom we are working with on the EPA task...
  10. DwayneM

    Received an offer to leave present employer

    *all names have been changed... yada,yada..* I work for TS LLC as a civil engineer. It's a small (4 PE's) firm, and when I was hired as the 4th, I was told it was because of my experience with EPA projects, having worked for a time for the EPA directly, because the firm expected to land a...
  11. DwayneM

    Concrete Crack Repair

    Thanks guys. Of course, one option is to do nothing, since the cracks are expected, but this is a high importance structure, so longevity is a priority; besides, I expect there to be a bit of movement / expansion / contraction, so the cracks will get worse. I do think a Xypex product (FCM-80?)...
  12. DwayneM

    Concrete Crack Repair

    I've been asked to propose a solution to a concrete cracking problem. A pile-supported concrete floodwall, about 9' high, was constructed around a site. To provide a working surface, the contractor had cast a 9" pad along the footprint with no joints. Of course the floodwall has joints at 50' or...
  13. DwayneM

    CTE Coating and pile friction

    Load = axial load capacity due to skin friction.
  14. DwayneM

    CTE Coating and pile friction

    Does coal tar epoxy coating appreciably diminish the load capacity (vs bare steel) for an H-pile? I don't see where the coeff. of friction would vary much between the two. Thanks!
  15. DwayneM

    110V 50 Hz motor on 120V 60 Hz home circuit

    Thank you all for the input. The motor is to essentially power a vibrating plate, so running faster won't necessarily require more power. Worst case, it'd trip the home circuit breaker, if not one on the equipment itself, right? I think the unit has a speed control on the motor, so I can...
  16. DwayneM

    110V 50 Hz motor on 120V 60 Hz home circuit

    I have a piece of equipment manufactured in China; the manual describes the drive motor as 110V, 50Hz 200W. Would it be ok to run this on standard US residential wiring (120V 60Hz)? I figure the motor would be pulling 1.6A instead of 1.8, so I'm not worried about harming the home wiring. Would...
  17. DwayneM

    Steel pile corrosion compensation

    I am assigned to evaluate a design where steel piles (HP section) are being used to support a concrete structure on a recently constructed embankment. The clayey soils are going to settle, possibly a few feet over the design life. The designer has elected to not paint or coat the upper portions...

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