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Recent content by dougantholz

  1. dougantholz

    16 hour SE Exam

    Paddington - NCEES has had multiple tests which have been adopted by states which cover the practice of structural engineering. Currently the SE1 counts to the PE (mine is in MO too) and that is all. The SE1 is just an alternative the general civil or other PE exams. Some states have a...
  2. dougantholz

    Double Wythe Brick Wall

    Use truss horizontal reinforcement of No 9 wire and treat as a cantilevered wall for design for out of plane loads. Add rebar in the cavity if you have cross sectional tension.
  3. dougantholz

    Which R factor to use for a 1996 steel building

    First: determine if the local building code has adopted the IEBC (International Existing Building Code) by ICC. If so, look at those rules. Second: if the IEBC is not law, then you should use chapter 34 or 35, I can't remember which of the IBC (Labeled existing buidlings). Third: don't worry...
  4. dougantholz

    Metal Deck Diaphragms (Flexible or Rigid???)

    Flexible for the most part. Smaller square'er diaphragms are often fairly rigid. Word of caution when considering un-equal stiffness vertical elements. Torsional re-distribution will occur.
  5. dougantholz

    Reinforcing for architectural concrete sign

    I would put some crack control reinforcement - say #3's at 12 EW. There isn't really any load on the thing of consequence. You do not need it to survive a car impact so that isn't a real load. You only want to do one layer becuase you don't want rust staining, but you still need to control...
  6. dougantholz

    Need advice on Mistakes

    A few rules I've learned in 10 years looking at drawings: 1. Take a minute to print something out, look at it just like your client looks at it. You often see font/presentation things here. 2. Look not just at what is there but what isn't there. Mistakes often happen by information that is...
  7. dougantholz

    Deck weld - E60 vs E70

    HgTX - not a welding expert - but it goes to the amperage used to make a E70xx liquify. You are more likely to burn through light gauge metal than thicker structural metal therefore use the lighter electrode.
  8. dougantholz

    Calculators!!

    I have (2) TI 36X's and an 85. One of the 36x's is almost 20 years old and is still a work horse for me. Its been in mud, in rain, stepped on, rolled over, sat on (and we're talking some weight here boys & girls) and it keeps on calculating. I killed a 35 a few years ago by spilling soda on...
  9. dougantholz

    Wall Studs?

    If gypsum can be used to resist lateral loads, to me it can be used to brace a stud for compression and bending. I don't usually use the stud compositely with the sheathing but I understand there are several research reports that indicate this is an acceptable practice.
  10. dougantholz

    Simplified Wind Procedure for Buildings with parapets.

    I say yes. If they wanted to exclude buildings with parapets they would have done so in 6.4 where they tell you the buildings where you cannot use the simplified procedure.
  11. dougantholz

    A706 rebar required for seismic?

    A706 is not required - but you have to make sure on the mill testing for Fy.
  12. dougantholz

    reinforcement in drop panels

    We don't typically add reinforcement, but maybe we should. I've seen some cracks develop down there, so that would be the reason to reinforce - crack control.
  13. dougantholz

    Working off of "Copyrighted" Project Plans

    First, I'm not a lawyer only an Engineer. This seems to be a simple case of intellectual property. If you are representing the existing structure in your drawings as "existing" then what you are doing is both ethical and reasonable. Could you field verify the conditions you are showing? It is...
  14. dougantholz

    Dampening Structural Vibrations--Good Books?

    You might look to make sure the machine is working properly. This happens quite a bit in hotels with the big washing machines and long period 10 story buildings.
  15. dougantholz

    Special Tube Moment Frame Requirements

    I think JAE has it right, and it goes to one of my pet peeves of the code: it is written for the average 8 story building. Engineers who work on smaller structures get very little funding support. To your specific problem - you can't use a tube because there are no pre-approved joints. I...
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