The fixed type bearing used in bridges is

1) Sliding Plate Bearing:

• Function: Sliding plate bearings are designed to accommodate large longitudinal movements in bridge structures. They consist of two plates, one of which slides over the other. The sliding action is usually facilitated by low-friction materials like Teflon.
• Use Case: These bearings are not typically used as fixed bearings because they allow horizontal movement. They are commonly used in bridges where there is a need to accommodate expansion and contraction due to temperature changes or other factors.

2) Elastomeric Bearing:

• Function: Elastomeric bearings are made of layers of rubber and steel. They allow for rotation and horizontal movements, making them ideal for bridges that need to accommodate thermal expansion and contraction, as well as minor vertical displacements.
• Use Case: These bearings are flexible and accommodate both rotation and translation. They are not considered fixed bearings because they do not restrict movement entirely, allowing for multi-directional displacement and rotation.

3) RC Rocker Bearing:

• Function: Reinforced Concrete (RC) rocker bearings are designed to allow rotation while preventing horizontal movement. This type of bearing is rigid and is typically used as a fixed bearing in bridge structures to provide stability.
• Use Case: Fixed bearings like the RC rocker bearing are essential in bridges to ensure that one end of the bridge remains in place, controlling longitudinal and transverse movements.