SEISMIC RETROFIT EFFECT BY A BRIDGE RESTRAINER WITH ENERGY ABSORPTION

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  • エネルギー吸収機能を有する落橋防止装置による耐震補強効果
  • エネルギー キュウシュウ キノウ オ ユウスル ラッキョウ ボウシ ソウチ ニ ヨル タイシン ホキョウ コウカ

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Abstract

Bridge restraint countermeasures have been taken against large-scale earthquakes for existing railway bridges after 1995 HYOGO-KEN NANBU EARTHQUAKE. On the other hand, the restrictions of space to set up bridge restrainers or to reinforce bridges are so severe that many bridges yet remain to be retrofitted. In this background, authors devised a new type of down-sized bridge restrainer that has the ability to absorb seismic energy. This paper describes the seismic retrofit effect of a newly-developed bridge restrainer with energy absorption through the non-linear dynamic response analysis in regard to a model of multi-span viaduct system. The validity of analytical model for this device is also verified by dynamic loading tests using models of bridge restrainers.

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