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  1. PEStructural

    Self-Supported Cone Roof

    Thanks for both your responses. So if, at the center of the roof, there is a vent of some kind, and neglecting the thermal aspects, is there a vertical pressure from the fluid itself, or just from any trapped air being "squished" (which won't happen because of the vent)? I'm just trying to...
  2. PEStructural

    Self-Supported Cone Roof

    Hi, I have a client that is requesting to fill a 2" in 12" self-supported cone roof up to the very top (apex) of the roof with liquid. I know this raises alarms in regards to venting, etc... What my question is - how does the liquid apply pressure on the underside of the roof? I would...
  3. PEStructural

    API 650 11th Edition - Seismic Anchorage

    Hello, API 650, 11th Edition, Section E.6.2.1.2 has equations for seismic anchorage. However, Section 5.12 in combination with Table 5-21 has equations for seismic anchorage as well. The question is, how have you approached the two conflicting equations? Do you look at both and use the most...
  4. PEStructural

    Select Optimized

    Is deflection governing? Sometimes you'll get small stress ratios when the deflection is nearing some point (say L/240).
  5. PEStructural

    Conical Bottom with supports

    I just had to redesign a 304 SS tank with a similar bottom (but much smaller diameter). They had used one central column with 6 radial beams spanning from the center column to the outside legs. Because these beams are taking the full weight of the product, they are going to be large. For my...
  6. PEStructural

    API 650 10th Ed, Addendum 4 Seismic Loads

    API 650, 10th Edition, Addendum 4, Section E.5.1.1 defines the response modification factors to be used with the standard. If you compare these values for the impulsive component (3.5 for self anchored and 4 for mechanically anchored) to ASCE 7-05, Table 15.4-2 for flat-bottom ground-supported...
  7. PEStructural

    STAAD Partial Moment release

    You could be conservative, and design the connection and members for both cases, fully released and fully fixed. This will give you different moments in different areas of the beams and columns which you can design for the worst case.
  8. PEStructural

    Instability Warning on a Fully Braced Platform

    Whenever I have a pinned support, I use the following support: FIXED BUT KMX 1 KMY 1 KMZ 1 This is telling STAAD that a VERY small moment can be acheived at the supports. In reality, this is true. You could apply a small moment to a "pinned" support, and have no rotation. This prevents any...
  9. PEStructural

    Conditional Hide Rows or Columns

    If you are looking for a blank cell in column AU, isn't column AU the 47th column? Maybe that's the problem. Also, if you have text in au3244, then it wouldn't hide per your macro, correct?
  10. PEStructural

    Conditional Hide Rows or Columns

    Is there anything typed into cell au3243? What about au3244? Any differences?
  11. PEStructural

    Conditional Hide Rows or Columns

    Does it hide the rest above and below?
  12. PEStructural

    Conditional Hide Rows or Columns

    Actually, The code you show: Rows("3:65203").EntireRow.Hidden = True should be: Rows("3").EntireRow.Hidden = True The problem with this would be if you hide the row that your cell is in, then you have to unhide the row to input a different number. Also, the "" doesn't work in the macro...
  13. PEStructural

    Conditional Hide Rows or Columns

    Try this macro: Sub auto_open() ' Run the macro DidCellsChange any time a entry is made in a ' cell in Sheet1. ThisWorkbook.Worksheets("Sheet1").OnEntry = "DidCellsChange" End Sub Sub DidCellsChange() Dim KeyCells As String ' Define which cells should trigger the...
  14. PEStructural

    Floor Grout

    The following is an excerpt from a spec concerning grout on a basin slab: A. Grout: 1. Proportions of Grouting Mixture: a. One part portland cement and 4 1/2 parts sand, by weight. b. Water Content: 1) Sufficient, to allow workability for spreading grout with...
  15. PEStructural

    Fluid Pressure

    I checked with an hydraulics engineer in house and I got the same equation. I came up with 96.89 psf. Good job!
  16. PEStructural

    Fluid Pressure

    Thanks a lot for the quick response!
  17. PEStructural

    Fluid Pressure

    Can someone help me remember how to calculate a pressure from a velocity of water? I have a pump in a river that flows at 10 feet/sec. I need to calculate the pressure the water exerts on the pump to design the anchorage. Any help would really be appreciated. Thanks!
  18. PEStructural

    Tank Nozzle Load Calculations

    I wrote a pretty slick excel spreadsheet that designs the nozzles per the alternate design approach from appendix P. Download it from http://PEStructural.4shared.com/ If you want to see the tables and equations that are included in the spreadsheet, unhide the rows at the bottom of the...
  19. PEStructural

    Contractor Forgot Washers

    Thanks to all who have commented. In this case, the contractor has hired me to find out if they need the washers. This time, I'm on the other side of the fence. A few answers: The anchor bolt is 1 1/2" A36 threaded rod. The plate is also A36. The nuts or not pretensioned. The reason why...
  20. PEStructural

    Contractor Forgot Washers

    Does anyone know of a code reference (AISC, UBC, IBC, etc..) that requires flat washers under the nuts of anchor bolts in tension. The contractor forgot to install washers under the nuts that hold down a column base plate. Due to the forces on the structure, these bolts are in tension in a...

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