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  1. ForrestLowell

    Minimum Temperature to Bend Rebar

    Is there a minimum temperature to bend rebar? We have a legit bar bending operation at our construction site so I am not worried about bend radius and the like as we have machines that govern all that. But there was a question thrown out if there was a minimum ambient temperature to perform the...
  2. ForrestLowell

    AISI 4340 Grade Bolts

    Gentlemen, I have a design that specifies Grade 10.9 Anchor bolts which are very difficult to source here in the middle east. If you know of someone in the middle east that can supply them that would be very helpful. In lieu of that, my contractor can supply AISI 4340 grade bolts which appears...
  3. ForrestLowell

    Use of Thermal Couplers during Concrete Curing

    Ron, Shortly after I posted this I realized that my spelling was wrong which was hurting my search results! Thank you for the clarifications and leads. The fun part about this, is I am in Saudi Arabia so I also have to sort out how to get them in country. Regards, Forrest
  4. ForrestLowell

    Use of Thermal Couplers during Concrete Curing

    ACI limits the temperature differencial between parts of conrete during the curing process. To monitor this thermal couplers are placed in the concrete during the pour. What brand names would you recommend for use. My company specifies the use of them, but not the best brand to use. Any input...
  5. ForrestLowell

    Crane Rail Clip Spacing

    MJCronin, Great minds think alike, I have an identical post on the strucutral board, I was trying to cover all the bases. Seems like most are in agreement that industry practice is to space them closer, but I think we are going to do some in depth analysis and try to space them further apart...
  6. ForrestLowell

    Crane Rail Clip Spacing

    One more clarification, the lateral load is 100kips, not the vertical. The lateral load is due to a 3.5 g factor during a seismic event at a critical facility.
  7. ForrestLowell

    Crane Rail Clip Spacing

    Thank you for the very useful hint, I looked it up and confirmed your thoughts. To clarify. My clips are not bolted, they are welded to the girder with 18" of 3/4" fillet weld. The 18" of weld goes in and out so that is how you fit 18" of weld on a clip that is 9 inches long. My lateral wheel...
  8. ForrestLowell

    Crane Rail Clip Spacing

    Thank you for the very useful links. To clarify. My clips are not bolted, they are welded to the girder with 18" of 3/4" fillet weld. The 18" of weld goes in and out so that is how you fit 18" of weld on a clip that is 9 inches long. My wheel load is about 100 kips, and the Iy of the crane...
  9. ForrestLowell

    Crane Rail Clip Spacing

    Is there a maximum spacing for crane rail clips? The 1989 version of the AISC ASD manual suggests a spacing of 3', but it is not a hard number. My clips are 9" long and I want to space them 4.5' on center. Strucuturally the crane rail is okay with the lateral loads applied, I am mostly curious...
  10. ForrestLowell

    Crane Rail Clip Spacing

    Is there a maximum spacing for crane rail clips? The 1989 version of the AISC ASD manual suggests a spacing of 3', but it is not a hard number. My clips are 9" long and I want to space them 4.5' apart. Strucuturally the crane rail is okay with the lateral loads applied, I am mostly curious if...
  11. ForrestLowell

    Partially Threaded Bolt

    I am talking about drilling and taping a plate. So no nut is possible.
  12. ForrestLowell

    Partially Threaded Bolt

    How do I find the strength of my bolt if it is only partially threaded? There is the general rule that a half inch bolt needs an half inch of thread to fully develop. I can't get a half inch, so what do I do?
  13. ForrestLowell

    Long-slotted and short-slotted?

    That is a correct assumption. I am in resident engineering group which addresses construction problems, our building is the size of several football fields so they have quite a few of these girts that need to be adjusted. and they really don't want to abandon the holes and weld them where...
  14. ForrestLowell

    Long-slotted and short-slotted?

    A single long slotted hole would work for me. But have 4 bolts arranged in a square only 2.5" between all bolts. Which means I cannot make a full long slot (cannot make a 2-3/16" slot with center to center bolt spaceing of 2.5") and keep the required clear distance to the next hole in the...
  15. ForrestLowell

    Long-slotted and short-slotted?

    The Facility is a process building for certain hazardous materials which due to certain requirements imposed by the government client has the need for a very beefed up siding material which must withstand seismic and wind events in the elastic stress range. So for this problem the strength of...
  16. ForrestLowell

    Long-slotted and short-slotted?

    Kind of, bolt spacing is such that I can only slot 1.5 inches in one ply which is greater than the short slot distance for the 7/8" bolt so I have to classify it as a long-slot. The tolerance on my girt lines are tighter than my column tolerances, and there are few places where it needs to be...
  17. ForrestLowell

    Long-slotted and short-slotted?

    AISC 13th edition (Black book) pages 16.2-21 states that short slotted holes can be used in both plys of a SC connection. it also states that a long-slotted hole can only be used in one ply of the SC connection. My question is, can I use a long-slotted hole in one ply and a short-slotted hole in...
  18. ForrestLowell

    Attaching Gypsum board to Metal vs. Wood Studs

    In case anyone was wondering, the dynamic fastener catelog page 67 has some comparisons, not a lot, but at least enough to get started. Any other ideas?
  19. ForrestLowell

    Attaching Gypsum board to Metal vs. Wood Studs

    It appears that most of the values in the UBC for drywall strength are based on anchoring to wood studs. I have metal studs in my building, do you know where I can find values for the shear and tension if I attach to metal instead of wood studs? Thanks
  20. ForrestLowell

    Clear Cover requirement at the end of a Stud

    So after much discussion with several of the senior engineers at my company, we determined there was actually no clear cover requirements. However, if the wall turns out to be exposed to the outside, we are going to galvanize them. But the code does not specifically address it.

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