Question

Calculate the ultimate moments for the section. Material are C30 (fck=30 MPa, fcd=20MPa) and S420 (fyk=420 MPa, fyq=365MPa). kı =0.82. Az=5018 560 mm 300 mm

please solve step by step and clearly

Answer 1

Step-1 Given fck = 30 Mpa. fy=420 Ast= 5x I x 18² 127 2.345 2 560 mm² - 300 Hulim kd Valim = 0.82 x 560 Hulim = 459. 2mm Step-3 = 1 0.36fck bh u = 0.87 fy Ast. Hu = 0.87 x 420X 1272.345 143.492mm. 0.36X 30x300 As nu<nalim Hence underreinforced sect". step-u Mu= 0.36 forbruld.o.u2na) Mu = 0.36x30x300x143,492 (560-0.42x143.492) Mu= 232.33 KN-m.

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