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Old Nov 5th 2016, 12:42 AM   #1
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shear stress at particular point in beam

In the example , i suspect the selected A (area) is wrong... From the notes , A' is the area of top (or bottom ) portion of the member cross sectional area . But , in the example , we could see that the selected area is located to the right of the point where shear stress is calculated , is the notes wrong ?


IMO , the selected A' should look like this , right ? (refer to green part in the 3rd photo )
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shear stress at particular point in beam-429.png   shear stress at particular point in beam-430.png   shear stress at particular point in beam-429-1-.png  
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Old Nov 7th 2016, 09:18 AM   #2
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The example seems wrong to me as well. The area above the point A is equal to the width of the top flange (which they don't provide) times the distance from A to the top surface (which they also don't provide, but looks to be about half of 19.6 mm). And the value for 't' is the width of the flange, not its thickness. I wonder if the point A is misidentified on the figure - if it was at the point where the web and the flange meet then I could understand why they have t=19.6 mm, but there would still be the issue of the wrong calculation of area above.
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