Question

A beam of square cross-section is placed horizontally with one diagonal horizontal as shown in the figure below. It is subjected to a vertical shear force acting along the depth of the cross section. Maximum shear stress across the depth of cross section occurs at a depth 'x' from the top. What is the value of x?

• A. x = 0
• B. x = (2/3)D
• C. x = (3/4)D
• D. x = D

Answer 1

The correct option is C x = (3/4)D

Maximum shear stress occurs at a depth from
top = 3/8 x length of diagonal

$=\frac{3}{8}\times 2D=\frac{3}{4}\times D$