Why is proper lubrication important for bridge bearings and how often should it be performed?

Proper lubrication is important for bridge bearings because it reduces friction between moving surfaces, allowing the bearing to function as designed and accommodate thermal expansion, contraction, and rotational movements. Without adequate lubrication, friction can increase, leading to increased stresses on the bearing and surrounding structural elements. This can result in accelerated wear, corrosion, and eventual failure of the bearing. The frequency of lubrication depends on the type of bearing, its exposure to the environment, and the manufacturer's recommendations. Generally, lubrication should be performed at least annually, but bearings in harsh environments or with high traffic volumes may require more frequent lubrication. Regular lubrication ensures that the bearing can perform its intended function and helps to extend its service life.