DESIGN SPECIFICATIONS FOR HIGHWAY BRIDGES - IISEE

construction site, and is normally situated below a surface soil layer shaking with
a ground motion different from the bedrock motion during an earthquake.
(8) Seismic coefficient method
A verification method of seismic performances in which seismic forces are
statically applied to a structure and ground, with use of the seismic coefficients
taking into account the seismic actions caused by an earthquake.
(9) Ductility design method
A verification method of seismic performances in which seismic forces are
statically applied to a structure and ground, considering the lateral capacity,
ductility, and energy absorption in the nonlinear range of the structure.
(10) Static verification method
Method verifying the seismic performances based on static analysis.
(11) Dynamic verification method
Method verifying the seismic performances based on dynamic analysis.
(12) Design vibration unit
A structural system that can be regarded as a single vibration unit during an
earthquake.
(13) Plasticity
A phenomenon of a structural member in which the member deforms beyond its
elastic limit when subjected to the seismic forces.
(14) Seismic lateral strength
Lateral strength of a structural member when subjected to repeated seismic
forces.
(15) Ductility
Performance of a structural member capable of sufficiently deforming in the
plastic ranges, while keeping its lateral strength unchanged when subjected to
repeated seismic forces.
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