APPLICATION OF CONTROLLED-STEPPING MECHANISM TO UPGRADED ROCKING PIERS FOR MITIGATING SEISMIC FORCES ACTING TRANSVERSE TO BRIDGE AXIS

• MIZUNO Yoshinori

  岐阜工業高等専門学校 環境都市工学科

• GOTO Yoshiaki

  名古屋工業大学 次世代耐震工学研究所

Bibliographic Information

Other Title

• ロッキング橋脚の自立化で基礎に作用する地震力軽減のための橋脚柱の浮き上がり免震機構

Abstract

 During the 2016 Kumamoto earthquakes, serious damages were observed in the highway overpasses supported by the piers with multiple rocking columns. In view of these damages, it was notified by the Japanese government that the existing piers with the multiple rocking columns must be upgraded to resist the seismic forces at least in the direction transverse to the bridge axes. As a result, non-negligible seismic transverse horizontal force and bending moment come to act on the foundations that were originally free from the seismic action. Therefore, the foundations for the upgraded piers must also be upgraded to resist the newly occurred seismic action. However, it is difficult to upgrade the foundations specifically in case when the highways are in service. In this paper, the validity of applying the controlled-stepping mechanism to the upgraded bridge piers is examined in order to avoid upgrading foundations by mitigating the seismic forces acting on the piers.

Journal

• Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE))

  Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 75 (1), 26-45, 2019

  Japan Society of Civil Engineers

Keywords

• over bridge
• rocking column
• uplift
• base isolation
• seismic control device
• seismic upgrading

Details

• CRID: 1390001288123950336
• NII Article ID: 130007601921
• DOI: 10.2208/jscejseee.75.26
• ISSN: 21854653
• Web Site: https://www.jstage.jst.go.jp/article/jscejseee/75/1/75_26/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed