# Shear stress at different points of beam

1. Dec 1, 2016

### fonseh

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. Dec 1, 2016

### fonseh

question here

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3. Dec 1, 2016

bump

4. Dec 1, 2016

### PhanthomJay

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.