The bending moment for filler joists near the middle of end span is

[where, w= Dead load plus live load per unit length of span, and L= Span, centre to centre of supports]

- 1
  
  $+ \frac{w l^{2}}{10}$
- 2
  
  $- \frac{w l^{2}}{10}$
- 3
  
  $+ \frac{w l^{2}}{12}$
- 4
  
  $- \frac{w l^{2}}{12}$

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