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  1. mapelCE

    ACI 318 Appendix D Elliptical Equation

    ACI318 Section D.7. Is anyone familiar with the reason that the traditional elliptical equation using the 5/3 exponential was replaced with Equation D-32? I couldn't find anywhere in the commentary that explained the reasoning. I ask because many anchor manufacturers publish load charts using...
  2. mapelCE

    P.E. required to stamp Welding Inspection results

    Thank you three for the responses. All three were very helpful. My company specializes in construction engineering, and this issue came up with some full pen splices that were done on beams that the contractor was using for falsework. The splices were done years ago, they have the...
  3. mapelCE

    P.E. required to stamp Welding Inspection results

    I couldn't find a past thread on this so here is my question. Can you legally require a Professional Engineer to stamp a welding inspection report. I ran accross a specification that requires that the results of non destructive testing on a weld be stamped by a P.E. It seemed to me that since...
  4. mapelCE

    Sheet Piles in Rock

    Geotechnical 76, I think PEinc and AChwalibog are right on. You will spend a fortune trying to drive into rock if you can do it at all. We just shredded some pretty solid sheets getting them throught stiff clay (N=40) If you can't adjust the design assumptions with reasonable comfort, then I...
  5. mapelCE

    sand jack

    Some specific info on one size of sandjack: We use 21"x15" out to out sandjacks. Walls made of 2x6 bottom made of 1/2" ply. Plunger made of 1/2" ply. Two 3/4" x.02" bands wrapped around box. Nailing side walls is optional. I've load tested numerous jacks with various fill materials. Concrete...
  6. mapelCE

    Too Many Requests for Calculations

    Good Afternoon all, I'm looking for advice/comments centering around what I feel are excessive requests by an owner for backup calculations. I read through JAE's thread507-89434 and a few other but haven't quite found what I'm looking for. I primarily work with temporary structures/support...
  7. mapelCE

    Thermally Cut Bolt Holes

    rholder98 You are correct concerning the material properties change. I looked through some of my resources and there's a great summary of flame cutting under the introduction section of one of our vendors at http://www.torchcutter.com Summary: Mild Carbon steels- some hardening around the...
  8. mapelCE

    Rain Delay - "Act of God"

    LCruiser, I'm a Heavy Civil Contractor I don't have a specific answer to your main question as we've never claimed "act of God" on rain days for anything other than 100 year storm type events. Typically, unless it's really big it's not worth the fight. I'll ask our lawyer if he knows of any...
  9. mapelCE

    How should the US change to deal with China?

    Moltenmetal, Your too doom and gloom. Think positive. Talk to Westerners that actually work in China and they'll tell you you're crazy for staying in North America. The government and market structure are an issue, but that is a short term problem. They'll change because market forces will...
  10. mapelCE

    How should the US change to deal with China?

    Gents/Ladies China isn't the problem. Our resistance to change is our biggest liability. We have to transition now from a primarily product based economy to a primarily service based economy. Not unlike our transition from agriculture to industry, this change requires us to retool the way we do...
  11. mapelCE

    Starting a Business on the Side - Using a Website

    Slugger 926, I lost track with all of the back and forth. I've often considered doing side work myself. I haven't because me day job is entirely too demanding and I can't give the side work the attention it needs. The other reason, and I haven't spent much time really researching this, but I...
  12. mapelCE

    saw cut expansion joints

    Caltrans Standard Specifications have details for expansion joints in PCC paving and Bridge work. You should be able to download them off their site.
  13. mapelCE

    Contract or Hand shake?

    In direct response to davidinidny's inquiry, I think Crossfire has nailed it on the head. If you're doing business as a P.E., at least in California, you will have a written contract. It's required by the Professional Engineer's Act. I found it interesting this year to see how often this is...
  14. mapelCE

    Grand Canyon Skywalk

    JAE, To your first question I can only say how sad. "Make the canyon more dramatic" and "make the experience like nothing else in the world". Wow! In a purely philosophical sense only a human could be that arrogant. If you haven't been to the canyon, go. It is one of the few places in the...
  15. mapelCE

    Concrete Formwork

    O.K., Took a little while to understand what you're asking but I think I get it. If I understand you correctly, your concerned with the "drag" of the concrete down the length of the form panel. This is tough to explain in memo form so I'll do my best. Let's start with the top "floater" form...
  16. mapelCE

    Analyzing Parking Garage for large crowd of people

    Interesting posts. Polka Frenzy....That is frightening. FYI The bridge that flattened was the Golden Gate. It occurred during the 75th anniversary celebration (I think I got the year right). The bridge was literally packed from one end to the other. People were absolutely gridlocked trying...
  17. mapelCE

    COVERAGE OVER CMP

    Can anyone point me to a good reference for determining minimum soil coverage over Corrugated Metal Pipes subjected to loading from above.
  18. mapelCE

    Geotechnics/Foundations

    Off the cuff recommendation for a web available resource: NAVFAC DM 7.2 which is available on line. Provides some good guidelines for matt foundations. Any number of books: Foundation Anlysis and Design by Joseph Bowles is a good one. Good Luck
  19. mapelCE

    Lateral earth pressure

    I'm sure you've got this sorted out by now but I'll throw in my two cents. K values for walls: Most geotech authors will cover this in depth and even Lindbergh discuss it in his review manuals for the CE. At rest is best used for walls that can't move. i.e. basement walls supported at the...
  20. mapelCE

    Cohesion used in stability analysis

    Probably a good place to start is the Army Corps of Engineers since both them and the BLM built most of the dams in America. They publish guidelines on all types of dam construction. Try this link: http://www.mines.edu/academic/mining/faculty/Kieffer/geotech_design_manuals_link.htm...

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