Simple Numerical on Shear Stresses in Beams Part-II (SOM)

 

Shear Stresses in Beams

Numerical #02: An I—section beam of size 350 mm x 150 mm has a web of thickness 10mm and a flange of thickness 20 mm. Find the maximum Shear Stress developed in the I-section, if the shear force acting on the section is 40 kN.

Simple Numerical on Shear Stresses in Beams Part-I (SOM)

further in the above numerical if it has asked to find average shear stress in the section then, can be found as,

Avg. Shear stress = Shear Force/ Cross-sectional Area

Avg. Shear Stress = 4500 /(100*150) = 0.30 N/mm2

And as we know maximum shear stresses will be at NA, and it can be alternatively found as, Max. Shear Stress = 1.5*Avg. Shear Stress

Max. Shear Stress = 1.5*0.30 = 0.45 N/mm2

Shear Stress Distribution across the section will be parabolic, as shown in fig.