fy = 250 N/mm²
Zp = 11 × 10⁴ mm³
γmo = 1.10
For a laterally supported plastic steel beam, the design bending strength is:
Md = (βb × Zp × fy) / γmo
For a plastic section: βb = 1.0
Therefore,
Md = (1.0 × 11 × 10⁴ × 250) / 1.10
Md = 25 × 10⁶ N·mm
Md = 25 kN·m
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