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  • Users: KarlT
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  1. KarlT

    Basketball Court Slab on Grade

    Hello all. I am looking at designing an exterior slab on grade for a 50 ft by 84 ft basketball court. The slab will be exposed to the elements, including freeze / thaw cycles. I am considering a 5" concrete slab on 6" of well-compacted granular. I was going to provide a 10" by 10" thickened...
  2. KarlT

    old dimensional lumber

    I also posted this in the wood forum.... does anybody know what the nominal dimensions of a 2x14" wood joist would be from 1961 vintage in Canada?
  3. KarlT

    Compression Flange Bracing????

    Let's say you have a 7" by 28" deep PSL beam spanning 30 ft. There are Pre-Engineered I-Joists bearing on top of the beam and the bottom of the beam is not currently restrained from lateral buckling. Now let's say I determine the maximum allowable unbraced span length for the PSL beam for...
  4. KarlT

    b/t limits?

    I am designing a column cap plate to connnect a 7" x 28" PSL wood beam to the top of a 5" x 5" HSS column. The cap plate will be made up of a 7"x 14" bearing plate (to provide the minimum required bearing area for the PSL beam reactions) and an 8" high x 14" long plate on each side of the PSL...
  5. KarlT

    Double Locking Nuts?

    Silly question.....say you have a threaded rod hanger connection in which a threaded rod is supported by a glulam beam. The glulam beam would have a vertical hole drilled thru the CL of the beam width, the rod would be passed through and then hung with a nut and washer on top of the beam, (and...
  6. KarlT

    Movement Joints in Interior Concrete Masonry Walls

    What is the maximum recommended vertical joint spacing for interior concrete masonry walls? Is there a difference if the walls are interior or exterior? (I'd think you could get away with a larger dim spacing on interior walls, since it doesn't go thru the thermal expansion and contraction...
  7. KarlT

    Wood Blocking in Stud Walls

    For wood framed walls I have seen the following general notes: -Provide wood blocking at 4'-0" max o/c - typ. (seems like overkill to me!) -Provide wood blocking at mid-height of all load bearing stud walls (works fine for short walls, but I would be less comfortable with that for tall walls say...
  8. KarlT

    Basketball Hoop Loading

    I am designing a gymnasium and I was wondering if there is a standard load (applied at the hoop) one would use for design of the anchors which fasten the basketball back-board to the gym wall? I'd imagine a pretty large guy doing a slam dunk would generate a half decent amount of force, but is...
  9. KarlT

    Roof Top Snow Loads

    Quick question. I have an existing building in Canada (built in 1931), upon which the owners are considering putting up a monstrous Air Handling Unit (Length = 38ft, Width = 13ft, Height = 12ft, Weight = 35,000 lbs). Now I pretty much already know without calculating anything that it won't...
  10. KarlT

    Hot-Tub on an Exterior Deck

    Does anybody have any experience in designing a deck attached to an existing house, which needs to support a hot-tub? I have asked the arch. for footprint and weight when the hot-tub is full. Are there any specific requirements for supporting that kind of load? (I'm thinking I may need to use...
  11. KarlT

    Old Rebar

    I just found a great reference article for use in looking at older concrete structures. The article outlines the history of the type of rebar that was used in the past, along with lots of other good info! http://www.crsi.org/PDF/edr_48.pdf
  12. KarlT

    Snow Loads & Arch Roofs

    I have some questions regarding snow loading around a arched roof. We have a school we are working on which is essentially square in plan with a rectangular gymnasium in the middle of the square. The Gymnasium walls project a minimum of about 2.5 ft above the 1.5:12 sloping low roof (which...
  13. KarlT

    Unbraced Length

    I have a quick question which I have always wondered about... Lets say you have two 12" channels spaced at 5 ft o/c and spanning 18 ft. At the third points of the main channel spans there is a 12" cross channel connecting the two main channels together. Now is the unbraced length of the main...
  14. KarlT

    Withdrawl Resistance of Wood Screws

    Does anybody know of any info on the withdrawl resistance of wood screws?
  15. KarlT

    Interior Partition Wall Pressures

    What kind of pressure difference do y'all get for interior partitions? I have one storey community club & gymnasium project with a 2x8 bearing wall 18 ft high, picking up a fair bit of roof load from two spans, but the wall is interior. I am trying to verify that the combined axial load and...
  16. KarlT

    Guy Wires for a Stainless Steel Chimney

    I am looking at a project in which some existing stainless steel chimneys are projecting 25 ft above a roof. The chimneys are for some summer boilers, and the client figures the exhaust may be around 800 degrees F. They have requested that we look at the possiblility of extending the existing...
  17. KarlT

    Bonded Concrete Topping Spec

    Does anybody have a good reference for bonded concrete topping specs (slab preparation, topping mix, placing, finishing and curing?) We want to put together one for use on our projects, and our master spec is pretty skimpy on that topic.
  18. KarlT

    1931 Vintage Rebar & Concrete

    I am working on an analysis of an existing University Building that was constructed in Winnipeg, Manitoba, Canada in 1931. The client would like to throw an 8000 # mechanical unit on the existing concrete joist roof. I do have a drawing of the original building. The roof construction note is...
  19. KarlT

    Floor Slopes in Structural Slabs

    I have a 7" main floor structural slab over 6" void form (no crawlspace required). The interior portion of the slab is supported off a grid of cast in place concrete friction piles c/w drop panels. Now, there are some areas that will require floor drains, and four finished sloping sides to...
  20. KarlT

    Brick Cladding Deflection Limits

    I have a project in Winnipeg, Canada with an exterior load bearing wood wall ranging in height from 20 ft to 30 ft. In addition, there is a partial height exterior brick veneer from the foundation up an elevation of 7'-0" above the foundation. To ensure the brick doesn't get unacceptable...

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