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Here is a sample introduction to bridge rubber bearings

Mrs. Wendy June 26, 2025
Bridge rubber bearings are essential components in bridge engineering, playing a crucial role in ensuring the safety and normal operation of bridges2.
Structure and Composition3
Bridge rubber bearings are usually made by vulcanizing and bonding multiple layers of rubber sheets with thin steel plates. This structure gives them sufficient vertical stiffness to reliably transmit the reaction forces from the superstructure to the piers and abutments. Meanwhile, they possess good elasticity to adapt to the rotation of the beam ends and have a relatively large shear - deformation capacity to meet the horizontal displacement requirements of the superstructure.
Types and Applications6

  • Laminated Rubber Bearings: Commonly used in small - and - medium - span bridges, they are divided into ordinary rubber bearings and PTFE - plate - laminated rubber bearings. Ordinary rubber bearings are suitable for bridges with a span of no more than 30 meters and low - displacement requirements. PTFE - plate - laminated rubber bearings have PTFE coated on the surface, which can bear larger vertical loads and are suitable for bridges with a span greater than 30 meters, such as long - span bridges and simply - supported - girder continuous - slab bridges.

  • Pot Rubber Bearings: The rubber is sealed in a steel structure. Through three - dimensional forces, the built - in rubber block can elastically support the rotation of the beam end, and the stainless - steel plate and coating can slide within a small range to generate horizontal displacement, which is suitable for various large - and - medium - span bridges.

  • Spherical Rubber Bearings: It is an upgraded version of the pot rubber bearing, composed of an upper bearing plate, a lower bearing plate, a spherical panel, a PTFE slide plate, and a rubber ring. With a small coefficient of friction, it has better shock - absorption and stability effects and is widely used in continuous curved - plate structures supported by single columns and long - span cable - stayed bridges.

Advantages2

  • Simple Structure: Easy to produce, install, and maintain, with no complicated operation steps.

  • Good Performance: Not easy to corrode, with moderate elasticity, which can well transmit forces from all directions and adapt to the deformation of the superstructure in all directions.

  • Low Cost: The raw materials are easy to obtain and synthesize, with a relatively low production cost. Moreover, they have a long service life, which can save maintenance and replacement costs.

Working Principle2
The main function of bridge rubber bearings is to transmit loads. They need to bear the static pressure transmitted by the bridge and the live loads generated when vehicles such as cars and trains pass through the bridge. They can also adapt to the expansion and contraction caused by temperature changes, concrete shrinkage, and other factors, and absorb part of the vibration and impact, reducing the impact of live loads on the bridge structure and piers and abutments, thereby prolonging the service life of the bridge

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