Guralp-systems ART Manual do Utilizador descarregar pdf (Página 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;

28 Issue C

RMS

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a t

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RMS

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∫

vt 

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1/ 2

RMS



∫

d t 

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1/ 2

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