For elastomeric bearings, which shape is better, rectangular or circular?
Elastomeric bearings are made of layers of synthetic chloroprene rubber (CR) or natural rubber (NR). Steel plates are placed between rubber layers, rubber layer will be merged by vulcanization to produce a single pad. The elastomeric bearing will allow for rotation of superstructure. Movement of the superstructure will be accommodated through elastic deformation.
The circular elastomeric bearing will be suitable for the large skewed and curved bridge. The circular shape will allow the bearing to accommodates movement and rotations in all directions. While rectangular elastomeric bearing will be suitable for low skewed bridges. The circular shape will have the advantage for standardization because only one dimension can vary in a plan.
Figure 2(skewed bridge)