Report No.: CCEER-92-9
Effect of Hinge Restrainers on the Response of the Madrone Drive
Undercrossing during the Loma Prieta Earthquake
Authors: D. N. O'Connor, M. "Saiid" Saiidi, and
E. A. Maragakis
Date: February 1993
A Report to the:
- California Department of Transportation
- National Science Foundation
- Nevada Department of Transportation
- Performing Organization:
- Department of Civil Engineering/258
- University of Nevada, Reno
- Reno, NV 89557
- Abstract:
- One of the most common seismic retrofitting techniques employed by the California
Department of Transportation in recent years is the use of longitudinal restrainer cable
systems. The Madrone Drive Undercrossing was retrofitted in 1985 with restrainer cables at
the intermediate hinges and concrete shear keys at the abutments.
- The October 1989 Loma Prieta earthquake caused extensive damage in the San Francisco Bay
Area. Ground acceleration at the Madrone Drive Undercrossing was estimated at 0.65-g.
This report describes the computer earthquake analysis conducted to determine the
effect of the restrainer cables on the bridge's response.
- Analysis cases examined include models with restrainer cables and without restrainer
cables. Comparison of the results is made which provides an indication of the performance
of the cables (Abstract by authors).