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  1. jt12

    Sliding of Foundation

    It's been a while since I've done a seismic design, but if my recollection is correct, it seems like I decided there likely would be at least a reduced seismic sliding force due to the foundation weight, but that ASCE 7-05 didn't seem to mandate that it be included.
  2. jt12

    Tension-only reinforced concrete members with lapped splices

    Since I didn't previously know (or forgot) that 12.15.5 existed, I guess I'm going to dig myself a deeper hole. The commentary says that a tension tie A) has axial tension over the entire section B) a level of stress in the reinforcing causing every bar to be fully effective C) limited concrete...
  3. jt12

    Tension-only reinforced concrete members with lapped splices

    If you put in a ACI tension lap splice, this should transfer the tension load. I've never seen anything implied in ACI that this tension lap splice is only valid for flexural members. That would seem to go against how the ACI code works. You can add the closed ties if you like, but if there...
  4. jt12

    How to handle uncomfortable technical disagreement/concern over design

    What reason does you P.E. give for not putting a nut on the threaded rod? Is their only response that we haven't done this in the past, so it isn't necessary, or is there some other reason?
  5. jt12

    Questionable Engineering Design

    Hurricanes and Earthquakes have much bigger coverage zones and are designed by typical building codes where Tornados are not. The worst hurricanes have wind speeds of 165 mph where tornados can have wind speeds of 200 - 300 mph. Steve Gregory and Woodman88 both make good points in that it is...
  6. jt12

    7.0 hits Haiti?

    The 1997 UBC had some seismic risk factors for various non-U.S. regions. I don't have one in front of me to check on haiti. Parts of Venezuela were risk category 4, but it seemed like it reduced as you went into the carribean.
  7. jt12

    Article by Structural Engineers Assoc. on SE exams

    StructuralEIT, Steellion: Currently the Civil exam is 1/2 breadth and 1/2 localized knowledge. The breadth portion is 20% structural. The localized knowledge portion could be 100% structural if you choose. So if your civil emphasis is Structural, 1/2 + 1/5*1/2 = 60% of the exam can be taken...
  8. jt12

    Article by Structural Engineers Assoc. on SE exams

    Not sure if Wyoming is correct in JAEs link? My Wyoming stamp says I'm a Professional Engineer (Structural).
  9. jt12

    Continuity and Reinforcment

    NS4U: The detail the way you presented it should provide continuity between the two (top) tension bars. To elaborate on my first post. The splice as it is shown is not really a splice between the bottom bar from the left and the top from the right. The way it will work is the top bar from the...
  10. jt12

    Continuity and Reinforcment

    Is this an elevated slab or slab on grade? Are these flexural bars, or are they for some other purpose? Seismic or non-seismic? For flexural continuity, you'd need some mechanism to transfer the tension from one tension bar to the other. If both bars could be tension bars you'd need a...
  11. jt12

    Beam chart Difference Between Black and Green Steel Books

    Yielding limit state is now based on Z rather than S. Gives sometimes up to 10-20% kick.
  12. jt12

    Can I count on shear-friction capacity of the reinforcement?

    miecz: `11.7.1 Provisions of 11.7 are to be applied where it is appropriate to consider shear transfer across a given plane, such as: AN EXISTING OR POTENTIAL CRACK, ...' They even give you a 1.4*lambda value for mu in concrete cast monolithically. Doesn't that tell you at some point it may...
  13. jt12

    Can I count on shear-friction capacity of the reinforcement?

    you incline your stirrups perpendicular to the crack, not the same inclined direction over the entire beam
  14. jt12

    Can I count on shear-friction capacity of the reinforcement?

    Good post RonRoberts & JAE. That makes sense. Miecz: they have a coef of friction value for concrete cast monolithically that is part of the shear friction equation. You need to design for shear friction as a failure mode anyplace that a crack may occur, regardless if it's in the same or...
  15. jt12

    Can I count on shear-friction capacity of the reinforcement?

    miecz: I think any place where the concrete is loaded to a point where a crack may form should be checked for shear-friction regardless if poured at different times. I've always considered shear-friction to be a secondary check to the normal shear capacity calculation. I've never seen that it...
  16. jt12

    Bridge Failure Comments

    Interesting conversations. I still can't get over in the article that a state is actually hiding tokens on bridges at obscure places to make sure the inspectors are doing an in-depth inspection job?? That's either sad or hilarious, and I can't make up my mind.
  17. jt12

    Seismic Loads for Los Cabos Mexico Area (Baja)

    Appendix in 1997 UBC has some design seismic zones for various cities in Mexico. Cabo isn't listed, but Tijuana, Mazatlan, & Hermosillo are. Should be able to give you a feel for what is appropriate.
  18. jt12

    Appendix D

    RON9876 - I don't think that testing indicated the previous design worked fine. At minimum, the old method had a horrible correlation between expected and tested results. These are the reasons they tried to come up with a new method. I try very hard to avoid the app D method because it is...
  19. jt12

    how to design this link beam

    If it is for seismic applications, need to comply with ACI Ch 21. They give you a diagram of how the rebar need to look. Hopefully, you're section is wide enough to do it.
  20. jt12

    Engineers.....doing shop drawings?

    Since you haven't been working there a year yet, I'd suggest sticking it out a bit, but making sure immediately that your boss understands that you are not going to be happy doing this for an extended period of time and want more experience and more out of the job. You are learning valuable...

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