If the length of a wall on either side of a lintel opening is at least half of its effective span L, the load W carried by the lintel is equivalent to the weight of brickwork contained in an equilateral triangle, producing a maximum bending moment

- 1
  
  $\frac{W L}{2}$
- 2
  
  $\frac{W L}{4}$
- 3
  
  $\frac{W L}{6}$
- 4
  
  $\frac{W L}{8}$

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