California Department of Transportation

Seismic Response Modification Devices

Seismic Response Modification Devices such as isolation bearings, dampers or other damping devices, and shock transmitted devices are required to be pre-qualified and accepted as approved new products before being used on Caltrans’ bridges.

Information about new product approval process can be found in California Department Transportation New Product Evaluation Guidelines .


To prequalify Seismic Response Modification Devices, the manufacturers shall include the test results according to the test plans list below in the submittal:

Test Plan for Bridge Isolation Bearings
Test Plan for Damping and Other Devices
Pre-approved Seismic Isolation Bearing list
Pre-approved Seismic Damper list



Our Mailing Address

California Department of Transportation
Division of Engineering Services
Office of Earthquake Engineering 
P.O. Box 168041, MS 9-2/5i
Sacramento, California 95816-8041