Briefly explain the reasons causing shear force and bending moment for a ship girder

Shear force and bending moment are caused by the external loads acting on a ship girder. These loads can include the weight of the ship and its cargo, waves, wind, and other environmental factors. As the ship moves through the water, it experiences forces that cause the girder to bend and twist. The bending moment is the force that causes the girder to bend, while the shear force is the force that causes the girder to twist. These forces can cause stress on the girder, which can lead to structural damage if not properly designed and maintained