Shear stress in bending member question

DrVirz · May 6, 2015

Hi all,

I was just wondering if someone could confirm that my answer to the below question is correct. The point where the question asks you to find the shear stress is at 2m (n). However, I don't believe this value needs to be included in the calculation anywhere?

Two-part engineering figure: a simply supported beam AB with 8 kN point loads, supports at A and B, spans of 2 m, 4 m, 2 m and 4 m, and section n-n; below, the built-up T-section with 100 mm flange, 20 mm flanges, 80 mm web and 60 mm base, marking joints a and b and dimensions 52 mm and 65 mm.

Handwritten shear stress working on lined paper: a simply supported beam diagram with 3 kN loads, a composite cross-section sketch with hatched areas, I = 8.627 x 10^6 mm^4, and shear stress calculations tau = VQ/Ib giving 3.89 kN and 4.3 kN.

SteamKing · May 6, 2015

1.) You are incredibly careless with units in this calculation. What are the units of stress? (Hint: it's not kN.)

2.) Your calculation of the shear stress at B contains a mistake in calculating the value of Q.

DrVirz · May 6, 2015

SteamKing said:

1.) You are incredibly careless with units in this calculation. What are the units of stress? (Hint: it's not kN.)

2.) Your calculation of the shear stress at B contains a mistake in calculating the value of Q.

Oh! My bad! Been a long day.

I will adjust to MPa or N/mm^2

Shear stress in bending member question

Discussion

Similar threads