**Question – **A simply supported rectangular concrete beam of 7 m span carries a characteristic dead load (*G _{k}*), including self-weight of the beam, and imposed load (

*Q*) of 7 kNm and 5 kNm respectively.

_{k}The beam dimensions are breadth *b* = 225 mm and effective depth *d* = 400 mm.

Assume *f _{cu}* = 30 N/mm

^{2}and

*f*= 460 N/mm

_{y}^{2}.

Calculate the area of reinforcement required.

**Answer: ** **Given b = 225 mm, d = 400 mm, l = 7.00 m, **

*G _{k}*

**= 7.00 kNm,**

*Q*= 5.00 kNm,_{k}** f_{cu} = 30 N/mm^{2}**,

*f*= 460 N/mm_{y}^{2}.Ultimate load (*w*) = 1.4*G _{k}* + 1.6

*Q*

_{k}= (1.4 x 7.00) + (1.6 x 5.00) kN/m

= 17.80 kN/m

Cross-sectional area of 01 no. 16 mm diameter bar = 201 mm^{2}

**Provide 4 nos. of 16 mm diameter bars resulting 804 mm ^{2}.**

*Note: **However, there are other limitations before considering the size and spacing of bars. Those factors will be discussed in another example.*