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  1. IsaacStructural

    Time to Drill Cores through Concrete Slabs

    Ingenuity, that is correct, though the slab is already partially composite, I'm trying to add studs. I've got some 45 foot long beams with only 28 studs, so there is quite a bit of room for additional studs (and thus additional live load capacity). Licensed Structural Engineer and Licensed...
  2. IsaacStructural

    Time to Drill Cores through Concrete Slabs

    I'm not sure I follow, what is the connection between the anchor and the steel? Are you drilling from below, through the flange? Licensed Structural Engineer and Licensed Professional Engineer (Illinois)
  3. IsaacStructural

    Time to Drill Cores through Concrete Slabs

    Can anyone give a rough estimate of the time to drill 3" or 4" DIA. vertical holes through 4.5" of LW Concrete? I'm looking to reinforce an existing composite slab by drilling cores, welding on new studs and then filling with non shrink grout, and I'm looking for a rough estimate of the time...
  4. IsaacStructural

    Interior Footing Embedment

    Here we drop exterior footings 42" for frost, and commonly place the top of interior footings directly below the slab on grade and provide a diamond control pattern at the column itself. Depth to bottom (bearing) of the footing depends on the footing thickness, but won't ever be less than 12"...
  5. IsaacStructural

    Responsibility for RTU Rooftop Curb Design

    Steelion, I've done the same calcs in the past, and come to the same conclusion. I think if you plotted out the two methods and the resulting overturning moment, there would be an overlap phase, Chicago would be more conservative for some heights/exposures and slightly less conservative for...
  6. IsaacStructural

    Responsibility for RTU Rooftop Curb Design

    After 200ft the values start to climb for every 100ft, so by the time you get to 1000ft building, the value is 42psf. If you compute the wind loads in ASCE 7-05 you often times get loads of less than 20psf, at least for shorter buildings in the area. the velocity pressure coefficients in ASCE...
  7. IsaacStructural

    Responsibility for RTU Rooftop Curb Design

    Archie264, Chicago has their own Code, the Chicago Building Code, which specifically exempts seismic requirements and the wind loading a simplified approach, 20psf main wind force for buildings up to 200feet tall. Cladding and Components have different requirements, but nothing extreme. Other...
  8. IsaacStructural

    Responsibility for RTU Rooftop Curb Design

    Just wondering, in your experience who is responsible for the design of rooftop curbs for RTUs? I've generally provided a reinforced opening in my concrete slab/metal deck and left the anchorage and detailing of the actual curb to the mechanical engineer. A mechanical engineer in my office...
  9. IsaacStructural

    Inryco Type 'V' Composite Deck, Historic

    I actually started on the path SITA suggested the same time I created this post. Wasn't sure which would come through first, looks like the company this time. I'm glad I tracked it down, it is quite a bit different than 2" composite decks from Vulcraft or other current suppliers that I'm aware...
  10. IsaacStructural

    Inryco Type 'V' Composite Deck, Historic

    Hey everyone, I'm working on a steel composite building from circa 1982. The deck type is Inryco, Type 'V' 2" deep with 2.5" concrete fill. Anyone have an old catalog with properties/load tables for this deck type? Thanks in advance! Licensed Structural Engineer and Licensed Professional...
  11. IsaacStructural

    Understanding loads on concrete floors

    I took a quick look through my Vulcraft manual and didn't see a deck type matching those you've described. If you can find a logo that would obviously help, otherwise you have to kind of go brute force, and just look at each manufacturer. Most manufacturers have their decking catalogs available...
  12. IsaacStructural

    Bolt Withdrawal Values in Steel, Alumnium

    The Machinery's Handbook just arrived. It has to be the fattest, stoutest book I've ever seen. Now hopefully I can find the information I'm looking for. A quick glance through suggests it has a lot of other fun stuff as well. Licensed Structural Engineer and Licensed Professional Engineer...
  13. IsaacStructural

    PE vs. SE Licencing Question

    I'm in Illinois and have both. I recommend you get them both. In Illinois you are allowed to take the PE exam prior to getting your 4 years experience, so you can actually take the PE exam soon after graduating. I found the PE to be much easier than the SE exam. Some Structural people would have...
  14. IsaacStructural

    Bolt Withdrawal Values in Steel, Alumnium

    Thanks! I'll see if I can dig up a copy. It actually doesn't look to be too expensive on Amazon, so I might just purchase a copy to have around the office. Licensed Structural Engineer and Licensed Professional Engineer (Illinois)
  15. IsaacStructural

    Bolt Withdrawal Values in Steel, Alumnium

    I've got a large aluminum sculpture I've been asked to look at. It contains some connections with drilled and tapped holes into the material. The holes don't go through, so there is no nut or washer. So any tension on the bolt is being transferred through the threads of the hole. Could someone...
  16. IsaacStructural

    Lateral Supports For The Building

    @mike, yes specifying the gauge of studs is standard procedure. Typically we specify the shape, gauge and spacing. Often non "structural" walls, still require our attention, for example, a 20 foot wall entryway wall. It may not be a part of the buildings main lateral or gravity load system, but...
  17. IsaacStructural

    Masonry Wall Out-Of-Plane Capacity

    I've read it a couple times and I'm having some trouble following your question here. What version of the code are you looking at? I've got 530-11 in front of me. Look at section 2.3.4.2.2 on page C-98. Does this answer your question? 2.3.4.2.2 "The compressive stress in masonry due to...
  18. IsaacStructural

    Looking for Typical hook, splice, development lengths. Anyone??

    I agree with the others, you can do the calculation by hand, and using excel make a nice spreadsheet. If you want a nice chart that someone has already made, these are included in the CRSI design manual, which is a good reference for this sort of thing. Licensed Structural Engineer and...
  19. IsaacStructural

    location and spacing of helical piers

    I have a four unit residential building with significant settling in one corner. I'm thinking reinforcing with helical piers or another similar system. I'm not concerned particularly with the load on an individual pier as the loads should be low when compared to the pier capacities. My concern...
  20. IsaacStructural

    Stormwater containment design ballpark fee

    I may have used the wrong word in the title of this thread, I don't know that the lot needs an actual containment structure, it just needs conventional drainage design, which may or may not involve storing/containing water. thanks, Licensed Structural Engineer and Licensed Professional...

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