The influence line for bending moment at section X(MX), at a distance of 4 m from the left support of a simply supported girder AB is shown in figure below. U uniformly distributed load of intensity 2 t/m longer than the span crosses the girder from left to right.
The max bending moment at section X is euqal to:
1
12 tm
2
24 tm
3
48 tm
4
96 tm