beam web crippling

huangyhg

beam web crippling
need advice on the calculations to determine the allowable crippling force in wide flange beams.
first of all, if you're not a structural engineer, it's in your best interest to find a licensed structural engineer to do this work for you.
that being said, determining the adequacy of a beam for certain loads (and the maximum load acceptable for certain beams) is directly related to the unbraced length of the member and the   
i'm just realizing you probably meant web crippling due to concentrated loads (such as at bearing plates). geez. this'll probably help you a lot more, if you still need it:
at the end of a beam, use: r/[(n + 2.5k)*tw] <= 0.66fy
at an interior concentrated load, use: p/[(n + 5k)*tw] <= 0.66fy
where: n is the length of the bearing on the web;
       k & tw are given in aisc manual;
       p & r are the load and reaction on the bearing area, respectively.