The concrete-strain relationship curve is shown in the figure below. When the value of  is as shown in the table below, calculate the  and  values of the equivalent rectangular stress block. 

fck=31Mpa and

It is assumed to be normal weight concrete, and all calculations are rounded to the fifth decimal place.

fo fck fc Becc = of ck E Ec = 0.002 Ecc Ecc 0.75 x 10-3 1.5 x 10-3 2.5 x 10-3 3.5 x 10-3 3.75 X 10-3 B Windows fo fck fc Becc = of ck E Ec = 0.002 Ecc Ecc 0.75 x 10-3 1.5 x 10-3 2.5 x 10-3 3.5 x 10-3 3.75 X 10-3 B Windows