Question

Which of the following are the conditions that stress strain characteristics of steel should obey to ensure plastic moment redistribution?

(a) yield plateau should be less than 6 times the yield strain

(b) ratio of ultimate tensile stress to yield stress should be less than 1.2

(c) steel should not exhibit strain-hardening capacity

(d) elongation on standard gauge length should be more than 15%

The question was asked in examination.

Question is from General Requirements for Plastic Design and Plastic Hinge in division Plastic and Local Buckling Behaviour of Steel of Design of Steel Structures

Answer 1

Correct option is (d) elongation on standard gauge length should be more than 15%

Easiest explanation: The conditions that stress strain characteristics of steel should obey to ensure plastic moment redistribution are: (i) yield plateau(horizontal portion of stress strain curve) should be greater than 6 times the yield strain, (ii) ratio of ultimate tensile stress to yield stress should be more than 1.2, (iii) elongation on standard gauge length should be more than 15%, (iv) steel should exhibit strain-hardening capacity.