Ductility Design of Foundations of Highway Bridge Abutments
Short summary:
Ductility design of foundations of abutments against severe earthquakes has been
newly introduced in the Specifications for Highway Bridges in Japan. This paper describes
the summary of the ductility design method as well as its background. One of the features
of this method is the adoption of a new procedure to evaluate seismic active earth pressure
that is applicable up to high seismic loads based on the modified Mononobe-Okabe method.
We also conduct back-analyses of the case histories of abutments including foundations
damaged in the past earthquakes following the ductility design method proposed here. The
results from the back-analyses confirm the applicability of the ductility design method.
Long summary:
Fundamentals of seismic design of abutments and their foundations Survey of case histories of damage to abutments Seismic loads employed in the ductility design method of foundations of abutments Seismic active earth pressure Estimation of inelastic response of foundation system Back-analysis of case histories and determination of allowable ductility factor.
Based on the damage mechanism estimated above, it is expected that we can prevent
abutments from severe damage as long as the possible displacement of the foundation
of an abutment during an earthquake is well-controlled even though liquefaction of the
subsoil layers may occur. Therefore the ductility design of abutments is applied to only
their foundations, and the specification requires us to carry out it when the subsoil layers
are considered to be liquefiable.
Source: www.pwri.go.jp
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