Cooperative Research

Viscoelastic Damper Installation in RC Building

by T.T. Soong

The installation phase of the $1.47 million design/build contract awarded to NCEER by the Naval Facilities Engineering Command was completed on August 31, 1996, about two months ahead of schedule. In this project, the Navy asked NCEER to analyze, design, install, and monitor the seismic upgrade of a Navy-owned, lightly-reinforced concrete building using viscoelastic damping technology developed at NCEER in cooperation with the 3M Company of St. Paul, Minnesota.

[Viscoelastic-damped Figure 1: Viscoelastic-damped brace installed in Naval Facility

The architectural/engineering firm associated with the design and installation was The Crosby Group of Redwood City, California; the installation contractor was Douglas E. Barnhart, Inc. of San Diego, California; and the viscoelastic modules were fabricated by the 3M Company. Shown in figure 1 is one of the 64 viscoelastic damped braces, each incorporating four damping modules placed horizontally below the floor beams. Figure 2 is a group photo taken during the post-installation inspection tour on October 11, 1996.

Figure 2: Inspection tour of Naval Facility in San Diego. [Viscoelastic-damped

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Last modified March 17, 1997