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

Contact information
California Department of transportation
Division of Engineering Services
Office of Earthquake Engineering
P.O. Box 168041, MS 9-2/5I
Sacramento, California 95816-8041
Office fax 916-227-8898

email Don Lee


Pre-approved Seismic Isolation Bearing list
Pre-approved Seismic Damper list