The 'plastic hinge rotation capacity' in steel beams depends on:
Choose the correct answer
Applied live load only
Section classification (Class 1 plastic), steel grade ductility, and lateral restraint — determines if plastic moment can be maintained during redistribution
Only the span of the beam
Connection bolt grade only
Correct Answer
B. Section classification (Class 1 plastic), steel grade ductility, and lateral restraint — determines if plastic moment can be maintained during redistribution
Why is this the answer?
Plastic hinge rotation capacity: needed when Pp (plastic collapse load) requires redistribution. Ductility depends on: (1) Steel grade (higher strength = lower ductility); (2) Section compactness (Class 1: can form and rotate plastic hinge; Class 2: can form but limited rotation; Class 3: reach My only); (3) Lateral restraint (prevent LTB); (4) Web-flange proportions. IS 800 limits Class 1 (plastic): b/t ≤ 8.4ε for flange, d/tw ≤ 84ε for web (ε = √(250/fy)).
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