STUDIES IN THE REINFORCEMENT OF BRIDGE SEATS AGAINST EARTHQUAKES

As earthquakes often occur in Japan, the dimensions of the substructures of bridges and their supports mainly depend upon seismic load for their design. In order to prevent the fall of superstructure or breaking of bridge seat concrete, the "Substructure Specifications for Highway Bridges" published in 1968 has defined the necessary distance from the edge of a bearing to the edge of a bridge seat in proportion to span length. Various types of damage to supports resulted from the Miyagiken-oki Earthquake in 1978. In consequence of a detailed investigation, the damage found among substructures designed with the above specifications could be classified into breakage of bearings and anchor bolts, cracking of bridge seat concrete, and slight damage to supports. The authors have undertaken a series of loading tests on bridge seat concrete to confirm the safety of structures built to present specifications and to examine more effective reinforcements, and have analysed the measured data. They have thus been able to confirm the validity of the specifications and have been able to propose some effective reinforcements. (Author)

  • Supplemental Notes:
    • Seismic Research for Highway Bridges (US-Japan) Program is a collection of Papers Reprinted Directly from the United States-Japan Cooperative Program on Natural Resources (UJNR) Panel on Wind and Seismic Effects; and the Proceedings of the US-Japan Seminars on Repair and Retrofit of Structures, 1979 to 1984.
  • Corporate Authors:

    Pittsburgh University, Pittsburgh

    Department of Civil Engineering
    Pittsburgh, PA  United States  15261

    National Science Foundation

    1800 G Street, NW
    Washington, DC  United States  20550
  • Authors:
    • SHIOI, Y
    • Mitsuie, Y
    • SHIMIZU, T
  • Publication Date: 1984-6

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Filing Info

  • Accession Number: 00394016
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 31 1985 12:00AM