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  1. edohma

    ABS Standard for Lift Boat Drilling Rig

    Hello everyone. I am new to the world of marine engineering and I am looking for help finding the necessary ABS (or equivalent?) standards that govern lift boat drilling rigs. I am responsible for designing a cantilever platform that extends off the boat. This cantilever will have the drill and...
  2. edohma

    Bolt Clamp Load Loss Due to Cyclical Loading

    IFRs-I was told this is an issue at multiple sites, but I don't know how true this is. I have limited info from the client... I am assuming this is a design specific issue at a specific site with a unique wind flow path. Also, no painting allowed since everything is galvanized that removes the...
  3. edohma

    Bolt Clamp Load Loss Due to Cyclical Loading

    dauwerda-I'm not exactly sure if this is what you are saying, but the bolts do not go all the way through the member. There are access holes to get to the interior beams as needed
  4. edohma

    Bolt Clamp Load Loss Due to Cyclical Loading

    rb-I will hopefully get to the point where I recommend locking hardware, and then tell them to do the accelerometers if they need more proof. Per your last statement, I completely agree. I am assuming someone found the loose hardware and from there the contractors or managers assumed this to be...
  5. edohma

    Bolt Clamp Load Loss Due to Cyclical Loading

    rb1957, IR, Ed-Yes, I wasn't exactly clear in the OP, but I think the structure design is having some vortex shedding/buffeting. To give some visualization, the roof is basically an inclined flat plate at 7 degrees. So there are possibly vortexes created on the leading and trailing edges, also...
  6. edohma

    Bolt Clamp Load Loss Due to Cyclical Loading

    Hello, I am trying to determine why bolts are losing clamp load on a steel car port structure. My best guess is that a semi-constant low speed wind is causing cyclical loading in the bolts and structure. My problem now is that I need to run the calculations to determine if this is actually...

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