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A singly reinforced concrete beam of 25 cm width and 70...

This question belongs to Civil Engineering RCC Structures Design
RCC Structures Design
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A singly reinforced concrete beam of 25 cm width and 70 cm effective depth is provided with 18.75 cm2 steel. If the modular ratio (m) is 15, the depth of the neutral axis, is

Answer & Solution
Correct Answer: Option C
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4 Comments
Anupama Bal
Anupama Bal 6 years ago
0.36*fck*xu*b=0.87*fy*Ast
xu=0.87*m*Ast/(0.36*b)
=0.87*15*18.75/(0.36*25)
=27.2 cm
=30 cm
Muhammad Saqib
Muhammad Saqib 7 years ago
0.5*b n^2 = m Ast (d-n).
0.5 25*n^2 = 15 *18.75 (70-n).
12.5*n^2 = 19425-281.25n.

By solving n = 30cm.
Kinjal Patel
Kinjal Patel 7 years ago
Formula : 0.5bn^2=mAst(d-n)
Manju Jadar
Manju Jadar 8 years ago
Please give me a solution
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