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Math Help - I don't understand how this works..

  1. #1
    WTF
    WTF is offline
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    I don't understand how this works..

    Can someone help me understand the following?
    I can do it all, but I don't understand how M(z,cat) equals 0.79?

    The Site Wind Speed, Vz, is all the five wind factors multiplied together
    Vz = V * Mls* M(z,cat) * Mt * Mr (m/s)


    The information for M(z,cat) is :

    Terrain
    Category 3

    Building Height (m) 7.5

    (z,cat) 0.79


    The numbers pertaining to the above are taken from a table, I will recreate here :

    Multiplier, M
    (z,cat)

    Height, z Terrain Category 3
    (m)

    ≤3 0.75
    5 0.75
    10 0.83
    15 0.89


    I really don't get the relationship between 0.75, Category 3 and 0.79 are,
    I don't understand what I need to do to have the answer equal 0.79?!

    Can someone help me please?!

    Thanks,

    WTF
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  2. #2
    MHF Contributor
    Joined
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    Ottawa, Canada
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    Quote Originally Posted by WTF View Post
    Terrain
    Category 3
    Building Height (m) 7.5
    (z,cat) 0.79
    The numbers pertaining to the above are taken from a table, I will recreate here :
    Multiplier, M
    (z,cat)
    Height, z Terrain Category 3
    (m)
    ≤3 0.75
    5 0.75
    10 0.83
    15 0.89
    Looks like a simple "proportion is used:
    you have 5 : .75 and 10 : .83
    so (being halfway between 5 and 10) 7.5 is simply (.75 + .83)/2 = .79
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