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  1. mferg318

    Pump pad that straddles new and existing foundations

    This is a small 20 hp pump.
  2. mferg318

    Pump pad that straddles new and existing foundations

    And it's not about saving money on the pad itself, it's about minimizing changes to a tank that is already in fabrication and still having the process piping work as it should. Like I said, I can push for a more difficult solution if need me, I'm just not convinced yet that there's not a simpler...
  3. mferg318

    Pump pad that straddles new and existing foundations

    Tank is already in fabrication because it's a long lead item...not ideal but that's how it goes sometimes. No real vibration concerns.
  4. mferg318

    Pump pad that straddles new and existing foundations

    I asked this too. It would require a 90 in the pipe near the suction which is not ideal. I can force whatever outcome I need to if there's no simpler solution that will always work, but I'm trying to be a team player.
  5. mferg318

    Pump pad that straddles new and existing foundations

    Thanks for the input everyone, a lot of good stuff to consider. To address a couple items: first, like I said in the original post, rotating the pump is not an option because it will require changes to the tank that is already being fabricated. Regarding expansion joints in the piping, I don't...
  6. mferg318

    Pump pad that straddles new and existing foundations

    I have a new mat foundation that supports a tank and pump. For various reasons, the pump sits partially on our new foundation and partially on an existing foundation (grey). My concern is differential settlement that might induce some stresses on the pump piping. I've already explored other...
  7. mferg318

    Impact of Abandoned Pile on Pile Group Behavior

    Here is the geotech's response for any interested: "I’m just thinking out loud. I assume you are not interested in doing pile testing on the existing pile and incorporating it into the new design. I also assume that you don’t want to tie the existing pile into the new pile cap and just ignore...
  8. mferg318

    Impact of Abandoned Pile on Pile Group Behavior

    Thanks everyone for the responses. Demo will be happening next week so I will update with my path forward after I know exactly what I'm dealing with.
  9. mferg318

    Impact of Abandoned Pile on Pile Group Behavior

    We’re not 100% sure because we don’t have drawings and haven’t uncovered them yet, but my guess is a large diameter drilled pier or perhaps augercast.
  10. mferg318

    Impact of Abandoned Pile on Pile Group Behavior

    I've got a new structure at a heavy industrial site sitting on a pile supported mat foundation. We discovered that there is an existing foundation within our footprint that was used for the removal of a large piece of equipment. We assume this is a pile cap with piles but can't find any...
  11. mferg318

    Return to RISA?

    In my admittedly limited connections to engineers at other companies, I'm actually noticing an opposite trend...that is, people either going back to RISA after trying another software for some period, or trying RISA for the first time.
  12. mferg318

    Rigid Diaphragm - Decking Connections

    Thanks Koot, I appreciate the detailed response and encouragement. I think I've satisfied any doubts I had about my design approach/assumptions. I've already designed my shear transfer reinforcement into the shear walls, so minimum required decking attachment to satisfy the items you listed...
  13. mferg318

    Rigid Diaphragm - Decking Connections

    What's the mechanism that explains this? Are we saying that once the concrete cures, the slab is so rigid that any connection of the decking to steel is negligible? In other words, decking connections are mostly for construction in this scenario? This was my design initial design assumption, but...
  14. mferg318

    Rigid Diaphragm - Decking Connections

    I'm designing a building with a rigid diaphragm (reinforced concrete slab with non-composite deck) and masonry shear walls. My design approach has been to have steel floor beams supporting the slab that carry gravity loads out to pilasters in the masonry walls. My slab is tied directly into the...
  15. mferg318

    Diaphragm transfer forces

    This is the approach I was going to default to next. I have the wall reactions from my model and use those in my shear diagram for the diaphragm. As long as loads from used in the model match what I use in the shear diagram, all should work out.
  16. mferg318

    Diaphragm transfer forces

    Let me switch the question up a bit. I've got a model of the building in question which assumes rigid diaphragm. I keep trying to get the shear in my lower level walls to match the reactions I get by doing a shear diagram for the diaphragm. But now that I think about it, reactions at the shear...
  17. mferg318

    Diaphragm transfer forces

    If you're designing with a fully rigid diaphragm assumption, then the diaphragm does indeed have an ungodly stiffness...thus some of my confusion. For what it's worth, it feel like diaphragm design in general is one of the most ignored aspects of structural design, doesn't get nearly as much...
  18. mferg318

    Diaphragm transfer forces

    But even if you have a continuous shear wall, the diaphragm would be tied in to the wall in some way (shelf angle or similar). So wouldn't load from the shear wall above still make it into the diaphragm?
  19. mferg318

    Diaphragm transfer forces

    What about the situation where we also have a shear wall directly above a lower wall, but supported by the diaphragm? Are we considering this in the design of the diaphragm, or is it more of a direct transfer to the wall below?
  20. mferg318

    Diaphragm transfer forces

    How is everyone handling transfer forces from discontinuous shear walls above a diaphragm, similar to the situation shown below? I'm specifically looking for how to incorporate the shear wall loads into the shear diagram for the diaphragm. Are you adding them as point loads, or distributing...

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