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Feng, J., Chen, H. “Bearings.”
Bridge Engineering Handbook.
Ed. Wai-Fah Chen and Lian Duan
Boca Raton: CRC Press, 2000

Section III
Substructure Design

© 2000 by CRC Press LLC


Types of Bearings
Sliding Bearings • Rocker and Pin Bearings • Roller
Bearings • Elastomeric Bearings • Curved
Bearings • Pot Bearings • Disk Bearings

Johnny Feng


J. Muller International, Inc.

Hong Chen

Selection of Bearings
Determination of Functional Requirements •
Evaluation of Bearings • Preliminary Bearing Design


J. Muller International, Inc.

Design of Elastomeric Bearings
Design Procedure • Design Example

26.1 Introduction
Bearings are structural devices positioned between the bridge superstructure and the substructure.
Their principal functions are as follows:
1. To transmit loads from the superstructure to the substructure, and
2. To accommodate relative movements between the superstructure and the substructure.
The forces applied to a bridge bearing mainly include superstructure self-weight, traffic loads, wind
loads, and earthquake loads.
Movements in bearings include translations and rotations. Creep, shrinkage, and temperature
effects are the most common causes of the translational movements, which can occur in both
transverse and longitudinal directions. Traffic loading, construction tolerances, and uneven settlement of the foundation are the common causes of the rotations.
Usually a bearing is connected to the superstructure through the use of a steel sole plate and rests
on the substructure through a steel masonry plate. The sole plate distributes the concentrated
bearing reactions to the superstructure. The masonry plate distributes the reactions to the substructure. The connections between the sole plate and the superstructure, for steel girders, are by bolting
or welding. For concrete girders, the sole plate is embedded into the concrete with anchor studs.
The masonry plate is typically connected to the substructure with anchor bolts.

26.2 Types of Bearings
Bearings may be classified as fixed bearings and expansion bearings. Fixed bearings allow rotations
but restrict translational movements. Expansion bearings allow both rotational and translational
movements. There are numerous types of bearings available. The following are the principal types
of bearings currently in use.

© 2000 by CRC Press LLC

26.2.1 Sliding Bearings
A sliding bearing utilizes one plane metal plate sliding against another to accomm...
Feng, J., Chen, H. Bearings.
Bridge Engineering Handbook.
Ed. Wai-Fah Chen and Lian Duan
Boca Raton: CRC Press, 2000
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