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  1. 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...
  2. 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...
  3. 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!
  4. 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...
  5. PEStructural

    Excel VBA Subscript/Superscript Macro

    All, I wrote this VB code for automatically subscripting/superscripting text. I find it very cumbersome to subscript and superscript text in excel. The following macro requires that you put brackets [] around anything you want subscripted and tildes {} around anything you want superscripted...
  6. PEStructural

    Excel Subscript/Superscript Macro

    All, I wrote this VB code for automatically subscripting/superscripting text. I find it very cumbersome to subscript and superscript text in excel. The following macro requires that you put brackets [] around anything you want subscripted and tildes {} around anything you want superscripted...
  7. PEStructural

    Partially Buried API 650 Tank

    I was wondering how I go about designing a partially buried welded steel tank. I can't find any reference in API 650 regarding this. I can perform a finite element analysis to determine the stresses, but what allowable do I use? Anyone know of any references? I've designed 100's of...
  8. PEStructural

    Circular Tank Overturning Toe Pressure

    What is the approach/equation to calculate the overturning toe pressure on a concrete ringwall in a seismic event? I have a 89'x32'H welded steel tank that is in seismic zone 4 and is resting on a concrete ringwall (not bolted down). Any help would definitely be appreciated. Thanks, Mike
  9. PEStructural

    Steel Water Tank Overturning Toe Pressure

    What is the approach/equation to calculate the overturning toe pressure on a concrete ringwall in a seismic event? I have a 89'x32'H welded steel tank that is in seismic zone 4 and is resting on a concrete ringwall (not bolted down). Any help is greatly appreciated. Thanks, Mike
  10. PEStructural

    API 650 Overturning Toe Pressure

    What is the approach/equation to calculate the overturning toe pressure on a concrete ringwall in a seismic event? I have a 89'x32'H welded steel tank that is in seismic zone 4 and is resting on a concrete ringwall (not bolted down). Any help would be greatly appreciated. Thanks, Mike
  11. PEStructural

    Tensile Stress In Concrete Ringwall

    I am designing an AWWA D100 circular steel tank that is supported on a concrete ringwall. I am designing the anchorage to the tank using ACI 318-02 Appendix D "Anchoring To Concrete". When designing for pullout strength ( Section D.5.3 ), there is a variable Y4. It then gives a stipulation...
  12. PEStructural

    Concrete Tensile Stress Area In Ringwall

    I am designing an AWWA D100 circular steel tank that is supported on a concrete ringwall. I am designing the anchorage to the tank using ACI 318-02 Appendix D "Anchoring To Concrete". When designing for pullout strength ( Section D.5.3 ), there is a variable Y4. It then gives a stipulation...
  13. PEStructural

    Design Of Column For Hydrodynamic Loads

    Does anyone have any references or a way to design a column for hydrodynamic loads?
  14. PEStructural

    Hydrodynamic Load On Column

    Does anyone have any references or a way to design a column for hydrodynamic loads?
  15. PEStructural

    Equivalent Radius of Helical Handrail

    Does anyone know an equation that calculates the equivalent radius for a helical handrail on a set of curved stairs?
  16. PEStructural

    Equivalent Radius of Helical Handrail

    Does anyone know an equation that calculates the equivalent radius for a helical handrail on a set of curved stairs?
  17. PEStructural

    Helical Handrail Equivalent Radius

    Does anyone know an equation that calculates the equivalent radius for a helical handrail on a set of curved stairs?
  18. PEStructural

    Designing For Geotechnical Acceleration vs UBC

    I am designing a 125 foot diameter steel flat bottom water tank. The geotech report included a probabilistic seismic risk evaluation which they gave as a tripartite response spectra. My question is, when comparing the acceleration from the geotech to the acceleration computed from the UBC, are...
  19. PEStructural

    Using A Response Spectrum For Design

    I'm designing a 125 foot diameter steel water tank. The geotechnical report included an earthquake design spectra (a tripartite graph based on 5% damping) and a graph of spectral acceleration vs. period for different damping ratios. How do I obtain the acceleration that I should design the...
  20. PEStructural

    API 650 - Steel Tank Roof Deflection

    What deflection requirement would you recommend for the rafters of a supported cone roof on a steel water tank (for DL + LL)? I know UBC states L/240, but this really isn't a building. Another point to ponder, the only time the full live load of 15 psf would be applied is under a snow load, so...

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