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A R.C.C beam reinforced on the tension side is 250mm wide with an effective depth of 450mm. It is reinforced with 4 bars of 18mmϕ.

Calculate the ultimate moment of resistance using ultimate load method(IS Method). Take σcu=20Nmm2 and σsy=425N/mm2

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b=250mm

d = 450mm

Ast=418mm=1017.87mm2

σcu=fck=20N/mm2σsy=fy=425N/mm2

To find = Mu= ?

To find depth of actual N.A.

Cu=Tu23fckba=fyAst23×20×250×a=425×1017.87

a=129.77mm amax=d2=4502=225mm

Here a<amax Under reinforced section

Mu=Tu×la=fy×Ast×(da2)Mu=415×1017.87×(450129.772)Mu=166.59kNm

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