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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. IsaacStructural

    Stormwater containment design ballpark fee

    I've got a project with a civil component and I'm looking for a general guideline concerning the price. The project is a city parking lot, 100'x125'. The scope of work is a boundary and topo survey and stormwater design, with a couple curb cuts. Although I don't do civil work anymore, this...
  7. IsaacStructural

    Routing and Sealing overhead cracks

    Just looking for general opinion. On flat plate concrete parking structures or similar, sometimes I've seen shrinkage cracks on the top and bottom of the slab. On the top surface, I generally recommend sealing the slab, and routing the cracks to 3/8" and installing an elastomeric filler over a...
  8. IsaacStructural

    Duct Bank Reinforcing

    Question came from an electrical engineer. For a cast in place underground electrical duct bank, that doesn't go underneath a road or other specific load source, are there guidelines for reinforcing/not reinforcing these? I could see adding temperature and shrinkage steel to make the thing stay...
  9. IsaacStructural

    Existing Concrete Structure, No As Built or Existing Drawings, How to verify Capacity?

    I've got what looks to be a series of little projects involving putting some AC panels on existing roofs. When previously discussed, the example projects had various steel bar joist roofs, wood roofs etc. Basically I'm supposed to do some quick calcs to verify the roof capacity and provide a...
  10. IsaacStructural

    Geofoam Under Stair Detail

    This is more of a general construction practices question. Please see the attached image. Just wondering, when building a stair over geofoam, is it common practice to leave the geofoam pieces rectangular and have the stair bottom follow this form as the architect is showing, or is the foam...
  11. IsaacStructural

    Zero Lot Line Construction

    This came up in a discussion the other day, I'm wondering, how are wooden homes built right next to each other with almost no gap between the exterior walls of adjacent homes? See the image linked below for an example of what I'm referring to. Are the walls fully sided and then just tilted up...
  12. IsaacStructural

    Corner Lintel

    Anyone have a good resource or detail for designing a lintel over a window that wraps around the corner of a building? I've seen these before but never designed one. One idea I'm thinking of is designing each leg as a cantilever and giving it a longer than typical back span to make sure the...
  13. IsaacStructural

    European Steel Section Properties

    I've got a design for an industrial structure that was built in europe, but now the company wants to build a similar structure in the US. The existing drawings use european section designations such as FL 80x8, and HE180A, could someone please point me to where I can find section properties for...
  14. IsaacStructural

    Embedment / fixity

    I'm reviewing another engineers calculations, They are Analyzing 11foot tall concrete columns/piers that are attached to 1 foot thick shallow foundations 3 feet below the surface of 110pcf soil (detailed soil properties are not provided), so the column projects 8 above the ground surface. The...
  15. IsaacStructural

    RISA Foundation Overturning

    Anyone familiar with retaining wall design in RISA foundation? How does the program handle complex wall geometries, for example, walls that have 90deg turns. I'm wondering, does the program account for the wall spanning between adjacent wall segments, and the increased overturning resistance...
  16. IsaacStructural

    Toe Nailed Rafters

    I've got an existing building, roof slope 9.5/12 in which the existing rafters are toe nailed into the attic floor decking, and possibly the joist below (I haven't been in the space to verify, though I will ASAP). Due to loading changes I'm planning to sister the joists, and I wonder, anyone...
  17. IsaacStructural

    Cracked CMU @ Point Load

    Please see the image attached. I wasn't on site but was passed along this image of cracking in a CMU wall on one of our jobs. Seems fairly clear that the cracking is the result of the point load from the beam. My guy on site didn't think there was any foundation issue (though he isn't...
  18. IsaacStructural

    SPFrame (PCAFrame)

    Anyone have experience with SpFrame they could share? I've used SPSlab and SPColumn (Formerly PCASlab and PCAColumn), and considering their limitations and simplicity, I've generally been happy with them. I've never used SpFrame and am wondering how well it functions. I'm considering it as an...
  19. IsaacStructural

    Structural Fee for Midrise Construction

    I've found a couple threads on small residential construction projects and others on simple commercial construction, how about multi unit residential construction fees? how do you guys price for this sort of work? Do you usually go per sheet or % construction cost? The project I'm looking at is...
  20. IsaacStructural

    S Curved Bridges

    Just a general question. I haven't designed bridges before, so hopefully someone with experience in that regard can give their thoughts. I'm wondering why this bridge and others are curved in an S shape like the image linked below. http://en.wikipedia.org/wiki/File:Donghai_Bridge.jpg I have...

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