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  1. jk2017

    Preferred method for preventing bolt loosening

    Been doing some research on bolt loosening for a job I'm on and while it seems like there are tons of options, I'm curious to know what your preferred method is. Doing some searching in this forum has yielded varying opinions, with some of the most popular including defacing the threads above...
  2. jk2017

    Evaluation of Existing Buildings Basics

    I am looking for resources on the basics of evaluating existing structures. I realized that while I've spent my two years out of grad school doing (very valuable) design and CA work, I'm not confident that I could perform an adequate assessment of an existing structure if needed. I certainly...
  3. jk2017

    Penetrations thru existing slab on metal deck cutting through chord reinforcing bars

    I have a 3" NWC on 3" metal deck with #8 @ 12" chord reinforcing and unfortunately will need some small 6" diameter penetrations that will cut through some of those bars. Has anyone encountered this and what could be a solution to reinforce the chords? In the past, I have just added trim angles...
  4. jk2017

    ACI 318 Concrete Wall Shear Strength in Tension

    Looking at ACI 318-14 Table 11.5.4.6, detailed method for calculating Vc for shear walls, there is an instance where, due to high tension in a wall, Vc turns *negative*. The commentary for this section (R11.5.4.6) even states that equation (d) (3.3*sqrt(f'c)*h*d + Nu*d/4lw), which is the...
  5. jk2017

    Hanging ductwork off rebar in slab?

    Hi all, A contractor for a reno job I'm working on wants to hang ductwork by chipping away at an existing slab and hooking the ductwork off existing rebar. Has anyone encountered something like this before and have watch-it's/opinions? The ductwork is very light, to note. I told him I'd look...

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