Guralp Systems ART User Manual
Page 28
ART
comparisons between the observed response spectra and
predictions by GMPEs and seismic design codes.
3.2.11 Strong-motion parameters
Clicking on the ‘Strong-motion parameters’ button opens
windows displaying a selection of strong-motion parameters for
the selected time-histories. The parameters that are displayed
are (divided into the characteristic of the motion that the
parameter seeks to measure):
1.
peak ground acceleration (PGA) in selected
acceleration units and the time at which this occurs;
2.
peak ground velocity (PGV) in selected velocity units
and the time at which this occurs;
3.
peak ground displacement (PGD) in selected
displacement units and the time at which this occurs;
4.
RMS acceleration in selected acceleration units
calculated from
where T is length of record and a(t) is ground
acceleration;
5.
RMS velocity in selected velocity units calculated from
where T is length of record and v(t) is ground velocity;
6.
RMS displacement in selected displacement units
calculated from
where T is length of record and d(t) is ground
displacement;
7.
A95 parameter in selected acceleration units, which is
defined by Sarma & Yang (1987) as the level of
acceleration that contains up to 95% of the total Arias
intensity;
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Issue C
A
RMS
=
∫
a t
2
dt
T
1/ 2
V
RMS
=
∫
v t
2
dt
T
1/ 2
D
RMS
=
∫
d t
2
dt
T
1/ 2