Jumat, 28 Desember 2012

Elastomeric Bearing Pads System

Elastomeric Bearing Pad systems 

Elastomeric Bearing Pads System (elastomeric bearing pads or steel-reinforced elastomeric bearings) are used widely as a low cost option as well as for minimal maintenance. In elastomeric bearing components, the sole plates are important so as to resist not only compression but also flexural stresses due to bending of bridge girders and local stress concentration near the load-bearing diaphragm. In steel box and/or plate girders, the bottom flange and the sole plate may act together in dispersing concentrated stresses. In concrete girders, however, a major role of the sole plate is to spread the stresses into a finite area to make sure that the direct bearing stress acting on the concrete is within the allowable value specified. Although the sole plate is an important component of a bearing system, past studies have been focused on the elastomer or steel reinforcement in the elastomeric bearing system. No specific requirement is provided for the determination of the sole plate thickness in any standard specifications throughout the world. The behavior of the sole plates in the elastomeric bearing system has been investigated by a series of finite element analyses. Based on the analysis results, a simple design equation to determine the sole plate thickness is proposed. Finally, the reliability and rationality of the proposed equation is demonstrated through examples.

Elastomeric Bearing Pad

elastomeric bearing pad system detail
Elastomeric Bearing Pad System Detail

Kamis, 27 Desember 2012

Elastomeric Bearing Pads

Elastomeric Bearing Pad for Structural Bridge

Elastomeric Bearings Pads are designed for use in bridges and similar types of structures.

Elastomeric Bridge Bearing Pad
Elastomeric Rubber Bridge Bearing Pads
Elastomeric Bearing Pads are used extensively in bridge structures and prestressed and precast concrete buildings. 
Bearing Pad Also used in industrial machinery and heavy equipment applications.
They act as a load transfer element that is capable of supporting a vertical force whilst simultaneously absorbing horizontal and rotational translations that may occur.They absorb vibration and prevent sound transfer, while reducing the destructive action of vibration between movable and stationary structural members. They also provide for movement caused by normal expansion and contraction.

Elastomeric Bearing Pad

Type Of  Elastomeric Bearing Pads

Plain Bearing Pad

Plain bearing pads are utilized when load, deflection, rotation and expansion requirements are minimal.  
Made of natural rubber or neoprene rubber , plain bearings can be cut to size from large slabs or molded 
individually to size.Molded bearings are designed with either single or compound bevels, or with vulcanized-bonded external steel load plates. Both molded and cut bearings may 
have skewed ends, clipped corners, holes, slots, be circular in shape, and/or contain top and bottom 

Elastomeric Bearing Pad Type
Elastomeric Bearing Pads

Laminated Bearing Pad

Laminated Bearing pads with internal steel plates greatly alter  the bearing’s vertical/load deflection characteristics. 
These “laminated” bearings are custom molded to any size or shape from neoprene or natural rubber.  
The reinforcing steel plates vary in thickness,depending on design needs, and are sandwiched between alternat-ing layers of elastomeric material.Laminated bearings can be molded with top and bottom vulcanized-bonded steel load-bearing plates.Most are molded from 50 or 60 durometer compounds. Laminated bearings may also be circular, beveled, or have skewed or clipped corner