Question

Which of the following is correct regarding class I section?

(a) They are not fully effective under pure compression

(b) They are capable of reaching and maintaining full plastic moment in bending

(c) They are not capable of reaching and maintaining full plastic moment in bending

(d) They does not exhibit sufficient ductility

The question was posed to me by my school principal while I was bunking the class.

Question is from Cross Sectional Classification topic in portion Plastic and Local Buckling Behaviour of Steel of Design of Steel Structures

Answer 1

The correct choice is (b) They are capable of reaching and maintaining full plastic moment in bending

To explain: Class I sections are fully effective under pure compression, and capable of reaching and maintaining full plastic moment in bending and hence used in plastic design. These sections will exhibit sufficient ductility.