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EQS Isolation Bearings

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EQS Design Services

Do you have a project that requires special bearing considerations? Or would you like more detailed bearing dimensions than available here? Please download our EQS Design Questionnaire and send it to our design team for free, no obligation design services.

RJ Watson EradiQuake Seismic Isolation Bridge Bearings

The EradiQuake System (EQS) is a state of the art Isolation Bridge Bearing System designed to minimize forces and displacements experienced by structures during an earthquake. The basic components of the EQS consist of a sliding multirotational bearing assembly with damping and a maintenance free device called the mass energy regulator (MER).

The Kingston Rhinecliff Bridge over the Hudson River in New York is a seismic retrofit project. 16 EQS Seismic Isolation Bearings were installed with a vertical capacity of 215 to 665 Kips

The Kingston Rhinecliff Bridge over the Hudson River in New York is a seismic retrofit project. 16 EQS Seismic Isolation Bearings were installed with a vertical capacity of 215 to 665 Kips

eqsgraphic_medThe EQS transfers the energy of a moving mass (kinetic energy), such as a bridge deck during an earthquake, into heat and spring (potential energy). This is done through the MER which connects the superstructure to the substructure. The EQS structural bearing devices can be adjusted at the direction of the design engineer to achieve a wide variety of energy dissipation levels. This is because the EQS is designed to dissipate energy through friction. By adjusting the friction levels the amount of damping can be controlled. This extraordinary feature gives the engineer the ability to optimize the structural design. Unlike an elastomeric isolation bearing, the lateral effective stiffness of an EQS bearing can be varied in different directions to optimize the response of a structure.