Moment Capacity
Section
Bending Strains
Stress Block
Section
Bending Strains
Stress Block hence ultimate moment of resistance = 253 x 123 x 10 3 = 31.1 kNm
Untensioned steel is therefore required to permit the beam to support an ultimate moment of 40 kNm.
Additional moment capacity to be provided =40-31.1 = 8.9kNm Effective depth of additional steel 245 mm then lever arm to additional steel « 220 mm and
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