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  1. vato

    11" slab on grade - max post installed anchor depth

    Thanks, I was enjoying the simpson software, but from what I can tell they don't have diamond core drill bit option. Hilti does offer an epoxy anchor for a diamond bit, with a roughening step. We are xraying the slab so theoretically, we will know where the rebar is, so we can avoid it with...
  2. vato

    11" slab on grade - max post installed anchor depth

    I'm attempting to specify some epoxy anchors in an 11" thick concrete slab. My concern, one of them, is how deep to drill before the bottom of the slab will blow out, or be damaged. We won't be able to tell if it blows out or cracks. The installer seems to have a "feel" for it, but I'd like...
  3. vato

    please rate tj-pro ratings

    Can someone comment on how well this rating system is working out in real life? I am just starting to mess around with it on a 22.5' span. It looks like l/720 LL defl typically gets a tj-pro 45 rating. Code minimum I-joist floors don't feel that great to me (l/360), but am I "over...
  4. vato

    rod x-bracing connection to web with hillside washer

    Thank you j19, that is IT! Thanks again.
  5. vato

    rod x-bracing connection to web with hillside washer

    Dhengr: Please Google 'anger management' before you post again.
  6. vato

    rod x-bracing connection to web with hillside washer

    I bit the bullet and made a risa fem plate model. I did use the YLT to design the top of a concrete vault years ago and I recall being amazed at how simple and efficient the method is. It really felt like engineering magic. I'll have to check this model with it. Thanks BA. I wasn't able to...
  7. vato

    rod x-bracing connection to web with hillside washer

    Not really but thank you. So far I have been looking at the bending of the web which isn't giving me enough so I have added a stiffener just under the slotted hole in the web for the diagonal brace. This is such a "popular" type of connection that I am surprised that there isn't more info on...
  8. vato

    rod x-bracing connection to web with hillside washer

    I need some guidance on how to design a hillside washer to web connection. Is there a published design guide for this which I can't seem to find? I have searched and searched with no luck. thanks
  9. vato

    retaining wall repair approach

    Thanks Ron and Kootk, Really, thank you very much. I'm in a small town and the only structural engineer. Discussions on this forum are invaluable to me. I was trying to simplify my questions by separating the issues on the wall. What I really need to do is separate myself from the project...
  10. vato

    10% entrapped air? Structural concern?

    We drilled out cores to get density and compressive strength. Density is 135pcf and comp strength is 3000 psi.
  11. vato

    retaining wall repair approach

    I have a poorly placed cantilever concrete retaining wall, 12" thick, 10 feet tall. The wall has a "cold" joint/pour line horizontally across it's entire length ranging in height from the bottom to a couple feet below the top. 2 layers of # 5 at 16" o.c. Not backfilled yet. It is a remote...
  12. vato

    10% entrapped air? Structural concern?

    I have a very unprofessionally placed retaining wall containing horizontal cold joints and excessive honeycomb. Too many issues for one thread. I'm looking at density here. We took cores and got some decent compressive strength results, but the density is ~135 pcf. The density appears to be...
  13. vato

    direct vent/conventional chimney share rooftop chimney box

    This is my first mech post, so please have patience with my ignorance. I am looking at a multistory condo, penthouse unit. Owner is replacing the wood fireplace with a direct vent gas unit. The flue and chases are separate, but 2 flues exit to one existing screened in chimney exhaust feature...
  14. vato

    negative pressure vs vapor pressure

    Thanks dbill, The building is a MJ grow op so odor control is crucial. This way all exhaust is filtered all the time. If a door is opened, air goes in hopefully. I think I better understand the relationship between the two pressures now, thanks. Maybe negative pressure moves the location...
  15. vato

    negative pressure vs vapor pressure

    Thanks willard3. I guess if you're not blind, then you can answer the question. Please lead us now.
  16. vato

    negative pressure vs vapor pressure

    It's more like 70% humidity on the interior 0% exterior 70deg int/0deg exterior.
  17. vato

    negative pressure vs vapor pressure

    I'm designing a wall and roof envelope for high interior/low exterior humidity, high interior/low exterior temperatures. Mech Eng's plan to create .05"wc neg pressure inside. I was attempting to use fiberglass insulation with vapor barrier on interior to save money. I'm now considering sprayed...
  18. vato

    concrete walls out of plane - vertical rebar is the only valid risa design result, horizontal is not

    Thanks Josh, I was hoping for your response. I understand what your saying about the general case being perhaps too complex for now. But, the wall results have enough information to design the steel in both directions for the concrete wall out of plane forces. I sure hope that the program does...
  19. vato

    concrete walls out of plane - vertical rebar is the only valid risa design result, horizontal is not

    I am modelling a foundation wall and after talking with RISA, is was confirmed that the concrete wall design results are only valid for the vertical reinforcement. So I am duplicating the wall and rotating it vertically. ( the risa tech guy was like, "uh, that should work I think" ) Now I can...
  20. vato

    ASD load reduction and shear wall capacity reduction

    thanks Robert, I felt like I was reducing the load too much. A little payback to ASD users from USD users designing ASCE7. I guess we deserve it.

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