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Recent content by lsmfse

  1. lsmfse

    Truck loading with lane load

    As I mentioned, private bridge. Client wants to build a new home and concrete supplier wants to know if they can take a full load(9 yards of concrete)over the bridge. I designed using 2 tandem 26k axle spaced 4' apart and 10k front axle 14' from rear tandems. The plans do show a sign posting...
  2. lsmfse

    Truck loading with lane load

    I have a single 42' span one lane (13' wide) bridge located on private property. It has a concrete deck supported by wide flange stringers. The requirements are to design for a 20T truck. I want to design for tandem axles (akin to HL-93). Since this is a private bridge, low volume low speed...
  3. lsmfse

    Interesting Break in Truss

    XR, the other thing I noticed. What are all the nails coming thru the OSB securing? Is there something on the roof located over this truss?
  4. lsmfse

    Interesting Break in Truss

    fixmytruss.com has some samples
  5. lsmfse

    Carbon Fiber Reinforce Polymer (CFRP) to reinforce the top of a drilled pier

    Not sure where your located, but Simpson Strong-Tie has good technical assistance. I believe they will assist with the design and use a preferred installer that is experienced and competant to install FRP
  6. lsmfse

    Large Concrete Cracks in Basement

    I remember when I was building my house, the contractor poured all the perimeter, interior continuous and interior spread footings. The slab section consisted of 4" sand base with w.p. membrane. When they came to put in the sand, they had this conveyor thing that shot the sand into the pad. The...
  7. lsmfse

    Live Load for Private Office Building?

    We use 85 psf for office building and when you add 15 psf partition load you are at 100 psf, so corridors can be located anywhere.
  8. lsmfse

    Thin concrete shell roof

    Great suggestions saikee, if the ownership wishes to move on with a more detailed analysis, I will consider these. I worked on a parking structure repair where the upper deck leaked, located where de-icing salts were used because of the snow. Testing lab performed pH tests for carbonation...
  9. lsmfse

    Thin concrete shell roof

    By the way, STARS for everyone!
  10. lsmfse

    Thin concrete shell roof

    saikee, Excellent observations and comments. I did speak to an SE today highly experienced in shell design and got some great insight. Evidently, the ribs are the primary support and the shell supports the shell as he put it. He mentioned these types of shells are very forgiving, holes aren't...
  11. lsmfse

    Thin concrete shell roof

    BA, that is exactly what it is, a short span barrel vault. I want to thank all of you for the insightful and thoughtful posts. I get a call from this really good client to investigate the possibility of supporting the conveyor from the roof, and I think "no big deal" (Project is 3 hour flight...
  12. lsmfse

    Thin concrete shell roof

    KootK, the first 8' of the arch is 4" thick and transitions to 2 1/2" thick. We are talking about probably 20 pairs of supports, about 8' o.c. supporting about 250 pounds per support. This is a conveyor as well, so there is some vibratory loading. The supports would be located at...
  13. lsmfse

    Thin concrete shell roof

    That is correct, 80 feet on the radius and 35 feet between ribs.
  14. lsmfse

    Thin concrete shell roof

    That's just it. Over the years, the building is almost 60 years old with existing conveyors/equipment supported from the roof. Additionally, HVAC and plumbing upgrades poked more and irregular holes in the roof. It looks like someone took a hammer and beat an opening for the pipe penetrations...
  15. lsmfse

    Thin concrete shell roof

    I have an owner who wants to suspend equipment from a thin shell concrete roof (Monoclastic shell). The shell varies from 4" to 2 1/2" thick. The arch is 80 feet wide. Knowing I can't get proper embedment with an epoxy anchor, I would penetrate through the shell and anchor from the top...
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