STUDY ON A NEW TYPE OF SIDE BLOCK FOR CONTROLLING SEISMIC DAMAGE OF BRIDGE BEARING

DOI Web Site 4 References
  • ZHANG Guangfeng
    一般財団法人首都高速道路技術センター 技術研究所
  • KURAJI Kentaro
    首都高速道路株式会社 技術部
  • WADA Arata
    首都高速道路株式会社 東京西局プロジェクト本部
  • MIGITAKA Yuuji
    首都高速道路株式会社 東京西局プロジェクト本部
  • OSUMI Keita
    一般財団法人首都高速道路技術センター 技術研究所

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Other Title
  • 地震による損傷を制御可能な新型橋梁用支承サイドブロックの研究

Description

 It was confirmed from the recent earthquakes that fracture of set bolts for side block was a typical damage pattern for bridge bearings. Fractured set bolts or the body of the side block which was loosened due to the fracture of set bolts may fall down below the viaduct and may cause third-party damage to passing vehicles or to pedestrians. In this study, a new type of side block named as damage-controlled side block (DCSB) was proposed for highway bridges with the purpose of preventing third-party damage in a severe earthquake due to the falling of the damaged side block parts. A DCSB was designed with high ductility without brittle damage such as fracture of the stopper or the set bolts. Load-carrying capacity and plastic behavior of the DCSB were examined by static tests and shake table dynamic tests on full-scale specimens. As a result, it was concluded that the performance of the DCSB satisfied the requirements considered in the development. Furthermore, dynamic behavior of the superstructure with the varying of the plastic condition of the DCSB was investigated basing on the results of the shake table dynamic tests.

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