Calculate the moment and the sag

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Mathijsgri
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The bridge is full extend 35 meters long, and retracted 17,5 meter long.
When the bridge is installed it rest on piont(375kN) and a
hydraulic pomp (525kN) , the mass of the bridge is 15 metric ton.

my question is how do I calculate the bending moment diagrams when it is extending and how do i calculate the bending when it is at 35 meters.
 

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