Support reactions

Support reactions are the forces that prevent a structure, like a bridge or beam, from moving or collapsing under external loads. When something rests on or presses against a structure, the supports push back to balance those forces. These reactions include vertical forces that counteract weight, horizontal forces if there’s side pressure, and sometimes rotational forces to prevent tipping. They are essential for maintaining stability and ensuring that the structure can safely carry loads without shifting or failing. Essentially, support reactions are the structure's way of balancing external forces and maintaining equilibrium.