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Shear stress at different points of beam

  1. Dec 1, 2016 #1
    1. The problem statement, all variables and given/known data
    i'm not sure how to calculate the shear stress at point F and point G . I know that shear stress has formula of $$ \tau = VQ/It $$

    The maximum shear force that i calculated earlier is V = 205kN , Ixx = 2.1x10^-4

    for Q at $$\tau$$ at F , i have (205x10^3)(260x10^-3)(50x10^-3)(98.5-25)(10^-3) / (2.1x10^-4)(260x10^-3)

    for Q at $$\tau$$ at G , i have (205x10^3)(250x10^-3)(50x10^-3)(50+125-98.5)(10^-3) / (2.1x10^-4)(260x10^-3)

    Is my ans correct ?


    2. Relevant equations


    3. The attempt at a solution
    The maximum shear force that i calculated earlier is V = 205kN , Ixx = 2.1x10^-4

    for Q at $$\tau$$ at F , i have (205x10^3)(260x10^-3)(50x10^-3)(98.5-25)(10^-3) / (2.1x10^-4)(260x10^-3)

    for Q at $$\tau$$ at G , i have (205x10^3)(250x10^-3)(50x10^-3)(50+125-98.5)(10^-3) / (2.1x10^-4)(260x10^-3)

    Is my ans correct ?

    I'm not sure whether my Q , and t correct or not . Can anybody check for me ?
     
  2. jcsd
  3. Dec 1, 2016 #2
    question here
     

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  4. Dec 1, 2016 #3
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  5. Dec 1, 2016 #4

    PhanthomJay

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    At G, you should be looking at the web thickness for vert shear stress at horiz cut, otherwise ok. At F , however, you should be taking a vertical cut for horiz shear stress determination.
     
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