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  1. StLHokie

    Ordinary Shear Wall Boundary Zones - No Requirements?

    These are two good considerations, thanks. I wasn't planning on going as far as detailing the boundary zones to match what would be required for a special wall system, I just feel like there should be *some* level of boundary detailing, I'm just having issues quantifying what level that should...
  2. StLHokie

    Ordinary Shear Wall Boundary Zones - No Requirements?

    Working on a 20-story building in SDC A utilizing ordinary shear walls with pretty low wind speeds (105mph). I have a strong seismic background and am used to the detailing requirements of special shear walls and boundary zones. With that said, I've got regions in my cores that exceed the...
  3. StLHokie

    Double layer mat foundation with infill between layers - What is the purpose?

    @KootK That was my initial thought, but it doesn't make sense that they would use a mat foundation below the slab on grade. Typically if you've got a slab on grade, you've got spread/strip footings for building loads. Because it's only a 1-story building, and allowable bearing capacity for the...
  4. StLHokie

    Double layer mat foundation with infill between layers - What is the purpose?

    I'm in the process of conducting a structural seismic evaluation in accordance with ASCE 41-17 for an existing hospital ICU in a high seismic zone and came across the foundation sections that can be seen in the image below: As you can see, there is essentially two foundation layers that...
  5. StLHokie

    Drift Capacities in ASCE 41

    Late to the party, but ASCE 41 focuses on performance based design as opposed to strength/force based design. Performance based design is a different design methodology than your typical strength-based design in that rather that designing elements to resist loads, you are designing elements...
  6. StLHokie

    Web Reinforcement of Existing Crane Runway Beam

    @jayrod12 I would normally agree with you, but replacing the runway beam just isn't an option at this point. The roof of the structure above the girders has already been completed. It's not possible at this time to remove the roof, as it's a concrete slab on custom stainless steel deck. The...
  7. StLHokie

    Web Reinforcement of Existing Crane Runway Beam

    @FLCraneBuildier Up to this point I've been using ASD. I'll look into using LRFD for this particular case and let you know what it results in. This isn't a PEMB, and I designed the runway beam that's already been built, it's a W24x68 with a C15x33.9 cap channel. Do you have a source/calcs...
  8. StLHokie

    Web Reinforcement of Existing Crane Runway Beam

    Hi folks, I'm currently working on a project that includes the design of a bridge crane runway girder. At this point in time, I've gotten news that (despite the runway girders already being fabricated and constructed on site) the bridge crane that will be used has increased significantly in...

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