The area of cover plates in one flange $(A_{P})$ of a built-up beam is given by

[where, Z= Required section modulus of the rolled beam section, $Z_{1}$ = Section modulus of the rolled beam section, and d= Distance between the centroids of the top and bottom flange plates.]

- 1
  
  $A_{P} = \frac{Z + Z_{1}}{d}$
- 2
  
  $A_{P} = \frac{Z - Z_{1}}{d}$
- 3
  
  $A_{P} = \frac{Z \times Z_{1}}{d}$
- 4
  
  $A_{P} = \frac{Z \times d}{Z_{1}}$

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