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  • Users: JEmH
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  1. JEmH

    Roof Collapse

    This is my area, although I've never skated there. NITTANYRAY: other local news video shows that the configuration is as you describe, so you're probably right. My brother-in-law claims that the local ABC station showed security camera video on the news this morning. Anyone have a link? (Of...
  2. JEmH

    Bridge Jacking Loads

    Lately it seems like I'm either involved with or hear about a lot of projects where it is necessary to jack a bridge superstructure off its bearings. This is generally to replace bearings or repair the substructure. So far, these have all been steel bridges, and the bearing types have varied...
  3. JEmH

    Friction of Stainless Steel on Teflon

    I'm working on a project where it would be helpful to know the temperature forces on an existing bridge pier. The bridge bearings consist of pots with a stainless steel plate sliding on Teflon with a center guide bar. The bridge was built in the mid 80's. The stainless steel surface appears...
  4. JEmH

    Requirements for bridge deck on steep slope

    Thanks for the (semi-)warm and fuzzy feeling and advice. Qshake: we have laminated bearing pads, and they're detailed so that they can't "walk off".
  5. JEmH

    Requirements for bridge deck on steep slope

    I'm currently looking at a highway bridge with a longitudinal slope of as much as 14%, which is more than I--or anyone else in my office--can ever recall seeing. I think I generally have my head wrapped around it with the exception of the deck. I'm concerned that it could be difficult to...
  6. JEmH

    HP 35s for you RPN engineers

    Since we are on the subject, I see that HP has a 48gII on their website. Has anyone used it? How does it compare to the 48g? My first one died some time ago and my current one is the company's. The 48g might be the only thing I miss when I'm in a new job. I think I could get used to the...
  7. JEmH

    HUD Foundation Inspections

    As I read in the "Guide to Permanent Foundations": 503-4. MASONRY PIERS AND WALLS. All masonry piers and walls shall have mortared bed and head joints. Reinforcing and grouting shall be in accordance with the foundation concept selected from Appendix A and designed in Appendix C. The...
  8. JEmH

    AASHTO bridge design

    It's been four years since I took the exam, so maybe things are different, but I found that there was enough time to find things in books that I only had passing familiarity with. So, as Boiler says, don't waste too much stress on memorizing the details. Knowing the organization and purpose of...
  9. JEmH

    Stardard form size in Europe (Croatia)

    I have a client who is going to be on a project in Croatia and wants to build a rectangular concrete settling tank at what I guess is a temporary industrial process water treatment plant. I am wondering what the common form dimensions are for concrete forms in that area. Here in the eastern...
  10. JEmH

    Wood Truss Repair/Replacement

    I just completed a project to repair an almost identical problem. In my case, they were installing an partition wall and had it too high on one end. In the course of slamming the wall into place they trashed the bottom chords. I used steel plates to splice the bottom chords back together...
  11. JEmH

    Old Steel Shape

    My Carnegie Pocket Companion has a 15" 55# channel. The amazing Slide Rule Era has a 1923 CPC on his web site.
  12. JEmH

    Built up LVL sections

    I'm not exactly visualizing where this has to fit, but can you do something with steel? You apparently have room for a 5 1/4" x 16" beam, so it seems like you would have space for a channel.
  13. JEmH

    Pittsburg Convention Center failure

    jt12, I thought that they only "fixed" the single failed girder connection back in 05. I'm not sure if the threads were included in the slots or not. However, I wouldn't think that it would have mattered. In my messing around with old bridges, I find that every steel on steel movable...
  14. JEmH

    Trench Footing on Geopiers

    I realize that PE's aren't generally proponents of the supernatural, but I find that the mere act of printing off a few resumes the night before magically makes a client meeting go swimmingly. But seriously, I would make sure that the Geotech in on board with the design, and get another...
  15. JEmH

    Wide Flange Beam - Effect of Fastener Hole Size in Flange

    The simple (and perhaps misleading) answer is that you can make the holes as big as the required edge distance from Section J3 and the required clearance to the web allow. However, as haynewp correctly points out, the only way to make the connection work for sure is to look at all the failure...
  16. JEmH

    Dock Floor Collapse at Convention Center in Pittsburgh

    Here's another article from today: http://www.pittsburghlive.com/x/pittsburghtrib/news/cityregion/s_492254.html The description in the text implies that the contruction is steel girders spanning along lines of concrete columns with steel beams framed into the girders and precast deck slabs...
  17. JEmH

    Dock Floor Collapse at Convention Center in Pittsburgh

    At the David Lawrence Convention Center in Pittsburgh, PA. I saw this on the news and thought it would get a good discussion going. A section of the 2nd floor collapsed under a truck at the loading dock, leaving the front of the truck hanging over the street below. I think this is steel...
  18. JEmH

    negative heel pressure at footings?

    Just in case this horse isn't dead yet.... If I'm looking at a service limit state I try to keep bearing pressure on the entire footing, or at least be close. At a strength limit state I'm less worried and generally like the resultant in the middle half or so. Also, if I'm on rock that is...
  19. JEmH

    Lateral Stability of PPC Beams

    When you say that the cable is at 60 degrees, what do you mean? Is it 60 from horizontal or 60 from vertical. Either way, how far to the good or bad are you if you just look at this in a quick and dirty way? That is, if you just put the 1st order F and M from the self weight and the cable...
  20. JEmH

    Welding in a tight space

    Right. I was pressed to supply a detail this morning, and that's pretty much what I did: plate that welds to everything. I think I was thinking too hard about it.

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