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Recent content by thaidavid

  1. thaidavid

    Floor Vibrations

    joemarch, Since floors usually give more problems when their natural periods are longer (more flexible floor system), the shorter joists might give an apparently more rigid answer. I would try using the longer joists for calculation, just so the upper bound on flexibility can be investigated...
  2. thaidavid

    Codes and specs for platform on power plant stack

    frostrobn, You may want to check the applicable API code for vessels and stacks. Also note, the minimum design wind load for these is 100 mph. David
  3. thaidavid

    Design of blast resistant steel enclosures

    LalyaZ, The Army Corps of Engineers in Vicksburg, MS, has done a lot of blast mitigation research. You might try getting hold of some non-secure analysis programs through them. David
  4. thaidavid

    elevated swimming pool design considerations

    MMOT, This would essentially be the same as a tuned mass damper (sloshing type), which would actually be a positive factor in resisting seismic shears. You might want to search on this subject to get further input. David
  5. thaidavid

    Gas Station Canopy

    tw, One reason these types of canopies don't perform well under extreme wind loadings is that, despite designing them to the ASCE wind load provisions, there are peculiar dynamic forces acting on them that are not usually taken into account. Some of these unrecognized force criteria include: a...
  6. thaidavid

    Shim Packer thickness in bolted joints

    dooron, AISC allows finger shims, up to 1/4" in thickness, in any type of connection, including slip-critical connections. Anything over 1/4" must be extended outside the margins of the connection and fillet welded to the base metal section. David
  7. thaidavid

    Footing for metal buildings

    marthab, Be very careful when considering using options 1 and 2, as these could be rendered ineffective by later floor modifications (saw-cutting), which often occur in industrial buildings. The present use, and intended future use, of the building should guide you in this decision. Since it...
  8. thaidavid

    Pipeline and Piping - Internal Coating Standards

    arctic, The AWS (American Welding Society) homepage (www.aws.org) will link you to their catalog section, where all of the specifications starting with "D10." relate to various pipe welding topics. The API (American Petroleum Institute) homepage (www.api.org) will link you to their...
  9. thaidavid

    Pre Precast Floor Planks

    pylko, We ran into a situation similar to this a few years back and the tubes used there were transite pipe sections. I wonder if those you encountered might be transite also? David
  10. thaidavid

    Drilled Shaft (or Pier or Caisson) Construction Clearances

    dison, We have used contractors with low-headroom drill rigs on some of our projects which need only 16 feet of headroom. There are some that go even lower - as low as 12 feet. As for lateral clearances, you need the width of the drill rig (about 8 feet), plus the area to dump the spoil...
  11. thaidavid

    chemical composition and formula for common steel screws

    Unknown, Try this link, maybe it will help. http://www.industrial-fasteners.org/rawmat/index.html David
  12. thaidavid

    Odd Beam to Column Connection (Steel)

    Pylko, I agree with Ron; our practice is to treat the single shear bolts as erection bolts only, and do not figure them in the equation when evaluating offset connection capacity. Evaluating the connection as has been suggested seems only necessary in the (uncommon) event that there is not...
  13. thaidavid

    Reinforcing Detailing

    Mark10, The main reasons our group details mats this way are twofold: The bend provides anchorage for developing the rebar for moments near the edge of the mat from wall (line) loads. The laps in the bends allow the top and bottom bars to be tied together for constructability location and...
  14. thaidavid

    Shelf Angle for Round Concrete Column

    Pouring, In the past we have used channels, oriented vertically, with their legs turned toward the column, to anchor other structural items. The channel's legs make it self-centering on the round column section, and the channel may be made as wide and as long as necessary to provide for...
  15. thaidavid

    Inflection Points In Long Steel Beams

    nicholi, Splice points are usually placed where the moment is least, to simplify the cost of the connection. For simply-supported, pin-connected members, this would be at the ends. As this is no help for splicing to extend length, simply move far enough back from the end of the beam to the...
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