The structural collapse of columns in bridges can be attributed to various factors, including overloading due to accidents or extreme weather, corrosion from harsh environmental conditions, poor design or construction practices, lack of maintenance, foundation issues, vehicle collisions, vibration and fatigue, and the spacing of stirrups in the column. Stirrups are an essential part of the column's reinforcement, and inadequate spacing or improper installation can weaken the column's ability to resist lateral forces, making it more susceptible to collapse. Regular inspections, proper maintenance, adherence to safety standards, and attention to stirrups spacing during construction and reinforcement are crucial in preventing such failures.