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Torsional checking for Steel angle member

  1. Dec 21, 2012 #1
    1. The problem statement, all variables and given/known data

    I meet a problem below:

    To check if the angle :200x150x12 S275 Grade can take a twist of 30kNm (on plan ) with Span 3m fixed end connected.

    2. Relevant equations
    θ = T L / J G

    3. The attempt at a solution
    My question is that even I got the angle of twist for this member??
    how can i check against design twist (30kNm) to see if it is adequate ???
     
  2. jcsd
  3. Dec 21, 2012 #2

    PhanthomJay

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    Well this case should generally be avoided because angle sections are not very good in torsion. What you are looking for is the max shear stress in the member, Tc/J, where T is the twisting moment, c is the angle thickness, and J is the polar moment of inertia often calculated by summing the values of 'bt^3/3' for each leg, where b is the appropriate leg width. Then compare that stress to the allowable shear stress of the material. Note that the steel angle section will both twist and warp. I haven't done such a calculation since school days.
     
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