In IS 800, the 'design bending strength' Mdz of a laterally supported beam is:
Choose the correct answer
Mdz = Ae × fy (axial capacity)
Mdz = βb × Zpz × fy/γm0 for laterally supported beams (no LTB reduction needed)
Mdz = Zp × fu/1.25
Mdz = I/y × fy
Correct Answer
B. Mdz = βb × Zpz × fy/γm0 for laterally supported beams (no LTB reduction needed)
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IS 800 Cl. 8.2.1.2: Laterally supported beam (LTB not critical): Mdz = βb × Zpz × fy/γm0 where βb = 1 for plastic and compact sections (Zp used), βb = Ze/Zp for semi-compact (Ze used for elastic). No LTB reduction. For laterally unsupported beams: Mdz = βb × Zpz × fbd (fbd reduced for LTB).
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