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  • Users: dik
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  1. dik

    Wind Load

    I used 0.5 as originally planned... the equivalent to a fairly 'dense' chainlink fence. I would suggest the porosity was approaching about 90%. The structure is low to the ground and is fairly sheltered. The steel components are not in a dense pattern. Also did not use 0.85 x DL for...
  2. dik

    Wind Load

    Closure on this... I've designed this with a reduced wind load based on an equivalent chain like fence resistance and I've used a 1/10 year return period wind load. I've designed the components for the full wind loading. I've picked up another reference... ASCE 10... Design of Lattice Steel...
  3. dik

    Concrete exposed to both chlorides and sulphates

    They are two different processes... The sulphate cause the formation on Etringite or gypsum which is expansive and causes the deterioration of the concrete.
  4. dik

    Concrete exposed to both chlorides and sulphates

    Unless you have a lot of slab, I'd err on the conservative side. I'd go for and HS or HSb mix with a 30 or 35 MPa strength. Check with the geotekkie...
  5. dik

    Things are Starting to Heat Up - Part XIV

    You must have provided a lot of help to China... they are leading the pack with about 40,000 miles of it.
  6. dik

    Things are Starting to Heat Up - Part XIV

    It's in operation... maybe Santa Cruz Metro should consult with them? The US seems to have problems with high speed trains, too.
  7. dik

    Things are Starting to Heat Up - Part XIV

    Electric Busses.... https://www.wri.org/insights/countries-electrifying-bus-fleets-fastest?apcid=006720f99ec2b54acbb90406&utm_campaign=systemschangelab&utm_medium=email&utm_source=newsletter
  8. dik

    Thread embedment required for bolt in tension

    In response to your question... Not at all, but I'll check. Reply back.... "To weld to CSA W59, a weld procedure qualification will need to be completed prior to welding the structural parts. That being said, it shouldn’t be an issue welding with 7018/ ER70."
  9. dik

    Wind Load

    Just decoration and a bench to sit on.
  10. dik

    air in sidewalk

    Concur...
  11. dik

    Wind Load

    Thanks HTURKAK... I've decided to go for the full wind value. The centroid of the load is close to the corner and unless I can get someone to measure it, my assumption will be a bit of a guess. If it's assembled I'll get them to balance it on an L3x3 to determine the centroid. I haven't done...
  12. dik

    Wind Load

    I think the 'structure' is pretty stiff; I don't think dynamics will be an issue.
  13. dik

    Wind Load

    Thanks JAE... Not likely... get a Darwin award. I think I will use the full wind load.
  14. dik

    Wind Load

    because of the large amount of void.
  15. dik

    Odd Wood Connection

    With mechanical equipment, I use Loctite 'red' to secure nuts.
  16. dik

    Wind Load

    Any suggestions on how to apply a wind load to this. I was thinking about using the area of the top with a wind load using half the wind load value. It's not secured. Stability is provided by concrete blocks. It's going to be displayed and used by the public. The height is about 15'.
  17. dik

    air in sidewalk

    It's not the strength, it's the air entrainment...
  18. dik

    air in sidewalk

    Freezing water can develop a compression force of 2ksi. 9000 ksi concrete has a tensile capacity of about 1/10 the f'c or about 900 psi... as you note, guess who wins. In Winnipeg (quite a bit different than Florida) I usually spec 5% to 7%. The air also helps with the workability. 3% is the...
  19. dik

    Bending Class of Reinforced Steel Beams

    See this discussion... https://www.eng-tips.com/threads/section-class.511413/
  20. dik

    Index for 12 page calculations?

    Make sure you send him a letter thanking him for reviewing your calculations.

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