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  1. Grizzman

    Natural frequency in ASCE question

    from ASCE 7-05, pg 294 eqn (c6-22a) reads : n1=(0.56/h^2)*sqrt(EI/m) can anyone please tell me the units for h, E, I, m? I had h=ft, E=psi, I=in^4, m=lb/ft(mass per unit height according to the book) however the answer yields in/ft^2 or 1/ft (w/ conversion) my problem: hss5x5x3/16 I=12.6, h=13'...
  2. Grizzman

    allowable flexural strength of a beam web

    I am designing a horizontal truss. The chords are W18x46. the perpendicular web members are W10x22. the diagonal web members are 5/8" dia. rod. the rods connect through the center of the web of the W18 between 6" -10" from either side of the perpendicular web members. The rod has a maximum...
  3. Grizzman

    simple drainage question

    I have a 10 x 10 x 10 (cm^3) container filled with water and open at the top. If I open a hole in the bottom with an area of 1cm^2, how long will it take to drain? Please consider ideal, but include the decrease in head. Also, could you post the equation for it? thanks, I've gotten answers of...
  4. Grizzman

    DC Basics help

    Could someone please point me in the direction of a page with the basics of DC circuitry design layed out. I haven't done any since college and my minds a bit rusty on it. Here's what I want to do. I want to have a capacitor charged when a switch is flipped. the when the switch is released, the...
  5. Grizzman

    "at rest" vs "active" earth pressure

    It's been a spell since I've designed a retaining wall and previously I always designed in based on active earth pressure forces. In browsing through my literature for a refresher, I happened upon a section that suggested designing the retaining wall based on the "at rest" earth pressure. The...
  6. Grizzman

    Seismic System designation Question

    I am designing a free standing mezzanine with moment connections at the beam to column connections. I plan on leaving the column pinned to the footing to reduce the footing size. So my question is this: What seismic sytem would this be considered according to the IBC? My initial thought was an...
  7. Grizzman

    A question regarding ACI 530-99

    Section 2.1.1.2.3 states the provisions of this section only apply to masonry structures not designed in accordance with 1.1.3. Section 1.1.3 states masonry structures shall be designed in accordance with chapter 1 and another chapter (including chapter 2). It appears that 2.1.1.2.3 is always...

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