REINFORCED CONCRETE. 



55 



Pig. 4—Distribution of Strain and equivalent Stress, over the Cross Section of 

 Plain Concrete Beam as experimentally determined. 



Extension on 40 

 inches in inches. 



Tensile Stress in 

 per sq. inch. 



- 1 



■* CO o 



o o 

 o o 



o o o 

 o o 



Compression on 40 

 inches in inches. 



Compressive Stress 

 lbs. per sq. inch. 



Extension or Compression on 40 inches 

 in Units of *0001 inches. 



Fig. 4 shows the strain diagram and the stress diagram 

 derived from it, bj' means of Fig. 3, for a plain concrete 

 beam without reinforcement. The stress diagram showing 

 the distribution of stress in the depth of the beam is shown 

 on the right of the strain diagram. 



The curves c, b, d, f, a, e, have been plotted from the 

 deformations obtained by the various instruments attached 

 to the beam at the positions shown in Figs. 1 and 2, the 

 exact distances from the top and bottom and centre of the 

 beam are the same as described in the reference printed 

 under Fig. 5. The results obtained havebeen used in drawing 

 the strain curves 1, 2, 3, and 4. 



