APPLICATION OF BASE ISOLATION TO SINGLE-SPAN BRIDGE IN A ZONE WITH HIGH SEISMICITY
The Carlson Boulevard Overcrossing is part of the 23rd Street Grade Separation Project, a major reconstruction of a complex intersection in the city of Richmond, California. The design of this bridge was based on a recommended, site-specific response spectrum because the project site is 3 km (1.86 mi) from the Hayward fault. The response spectrum values are very high over a broad range of periods. Also, because of the proximity of the structure to the fault, large displacements occur at the longer periods. The initial design approach was to use a two-span concrete structure with a center bent. It was then determined that the entire grade separation could be spanned with a single-span structure and the cost of the center bent could be saved. The single-span, multicell concrete box girder structure is 153 ft (46.6 m) long, varies in width from 49 to 57 ft (14.9 to 17.4 m), and is on a skew of approximately 40 deg. With the single-span structure, the lateral earthquake forces are required to be resisted by only the abutments. However, the tall seat-type abutments used for this project were not able to resist the large accelerations required by the response spectrum. Therefore, isolation bearings were selected to reduce the lateral seismic forces and to accommodate the large displacements at the abutments. The joints between the abutments and superstructure consist of 2-in. (5.08 cm) joint seals for everyday service use and short knock-off walls that give way for the large seismic movements. The analysis, design, and construction of the Carlson Boulevard Overcrossing are described in detail.
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Supplemental Notes:
- Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
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Corporate Authors:
500 Fifth Street, NW
Washington, DC United States 20001 -
Authors:
- Kwong, J
- Lindsay, R K
- Woodworth, A J
- Jones, D M
- Knight, R P
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Conference:
- Fourth International Bridge Engineering Conference
- Location: San Francisco, California
- Date: 1995-8-28 to 1995-8-30
- Publication Date: 1995
Language
- English
Media Info
- Features: Figures; Photos; References; Tables;
- Pagination: p. 79-87
- Monograph Title: FOURTH INTERNATIONAL BRIDGE ENGINEERING CONFERENCE, SAN FRANCISCO, CALIFORNIA, AUGUST 28-30, 1995. CONFERENCE PROCEEDINGS, 2 VOLUMES
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Serial:
- Transportation Research Board Conference Proceedings
- Issue Number: 7
- Publisher: Transportation Research Board
- ISSN: 1073-1652
Subject/Index Terms
- TRT Terms: Bearings; Box girder bridges; Bridge abutments; Conferences; Earthquake resistant design; Joints
- Uncontrolled Terms: Joints
- Old TRIS Terms: Isolation bearings
- Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;
Filing Info
- Accession Number: 00711713
- Record Type: Publication
- ISBN: 0309061091
- Files: TRIS, TRB
- Created Date: Sep 6 1995 12:00AM