In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
American Concrete Institute
38800 Country Club Dr.
Farmington Hills, MI
Chat with Us Online Now
Feedback via Email
Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Design Guidelines for Lead-Filled Elastomeric Bearings for Use in Seismic Isolation of Bridges
Author(s): T. Kelly and I. Buckle
Publication: Special Publication
Appears on pages(s): 551-576
Keywords: bridge bearings; earthquake-resistant structures; elastic properties; energy dissipation; isolation; lead (metal); rubber; structural design; Design
Abstract:Elastomeric bearings have long been used for bridge structures to provide thermal movements and girder rotations under service loads and in building structures to isolate them from ambient vibrations. By increasing the total rubber thickness and by inserting a lead plug for energy dissipation, the function of the bearing may be extended to provide seismic isolation of bridges. Seismic isolation is a design concept that reduces earthquake forces by factors of up to 10, thus greatly enhancing the seismic resistance of the supported structure. This paper provides design guidelines to enable lead-rubber bearings to safely and efficiently act as seismic isolators and reviews the mechanical properties of lead-filled elastomeric bearings. Factors affecting the elastic and postelastic properties are listed, and other design-related parameters are described. A set of design procedures to incorporate the lead-rubber bearings for bridge structures is presented. These procedures include the determination of plan size to support gravity loads, the rubber thickness to provide the required flexibility, and size of the lead core to provide energy dissipation. The procedures are applicable for areas of low and high-seismic risk. The application of the procedures is illustrated by use on a seven-span bridge.
Click here to become an online Journal subscriber