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  1. trou33

    ASCE 7-22 Fundamental Period for Non-Building Structures (15.4.4)

    I've been trying to figure out why I get different results using my calculator vs excel (might have found something to watch out for on my calculator). The resulting value using g=386.4 is what I was expecting - it's just odd in my mind to use that for g rather than 32.2 (assuming delta is...
  2. trou33

    ASCE 7-22 Fundamental Period for Non-Building Structures (15.4.4)

    In ASCE 7-22 (and 7-16), equation 15.4-6 is used to find the fundamental period of a non-building structure, and by its inverse, the natural frequency. It's a simple enough calc for the 10'x10'x5' braced frame structure I'm designing for a piece of equipment that requires a maximum 20Hz limit...
  3. trou33

    Circular Tank Wind Drag Coefficient, Cf

    I'm designing foundations for large (tall) industrial tanks and I have two related topics that are not clear to me. Using ASCE 7-16 for wind pressures, 29.4.2 gives criteria for when to consider tanks grouped, isolated, or when to interpolate the drag coefficient. However, there does not appear...
  4. trou33

    ASCE 7 Air Permeable Cladding Reduction for MWFRS Pressure

    Does anyone have a design approach for a reduction to the MWFRS wind pressure if a cladding is used with a given percent openness that involves more than just reducing the pressure based on the percent open? Here is the situation: We're designing a facility to be hardened for an extreme wind...
  5. trou33

    Price Correlation to Concrete Strength (and other properties)

    It's similar in most regions my projects are in. I don't recall a 3ksi mix submitted that wasn't reaching 4ksi or higher. So I'm not sure how the GC in this case priced a 3ksi mix if most suppliers would be providing the same mix either way. Any estimating personnel out there have input? Make...
  6. trou33

    Price Correlation to Concrete Strength (and other properties)

    Hello. Long time, first time. Until recently, I've understood that 3ksi and 4ksi concrete mixes were comparable from a price perspective. I had a design manager with a GC indicate that their pricing exercise may have been completed with 3ksi mix and using 4ksi would be an unnecessary cost. He...

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