EFFECT OF POST-YIELD STIFFNESS OF BEARINGS OF BRIDGES WITH MULTIPLE NONLINEAR POINTS ON RESPONSE OF WHOLE BRIDGE SYSTEM

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  • FUJIOKA Kensuke
    土木研究所 構造物メンテナンス研究センター
  • HIROE Akiko
    土木研究所 構造物メンテナンス研究センター
  • OHSUMI Michio
    土木研究所 構造物メンテナンス研究センター

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Other Title
  • 複数箇所が非線形化する橋の支承部の二次剛性が全体系の応答に与える影響

Abstract

<p> In the design for level 2 earthquake, Specifications for Highway Bridges states that if the seismic response characteristics can be evaluated appropriately, it is possible to consider nonlinearity in multiple types of members, such as seismic isolation bridges. However, the specific requirements and verification methods for that purpose are not indicated. To clarify these points, it is necessary to clarify the effects of various uncertainties on seismic response of bridges. In this paper, by dynamic analysis of two patterns of structural systems using seismic isolation bearings or seismic control dampers, the effect of the post-yield stiffness of bearing part on the relationship between the uncertainty of member properties and the seismic response was investigated. As a result, it was shown that when the post-yield stiffness of the bearing part is smaller than that of the seismic isolation bearing, the reliability of the response evaluation tends to be lower than that of the isolated bridge.</p>

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