Empirical Scaling of Rotational Spectra of Strong Earthquake Ground Motion

Lee, V. W.; Trifunac, Mihailo D.

doi:10.1785/0120080070

Cited by 40 publications

(22 citation statements)

References 21 publications

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“…In figure 1 of the article by Lee and Trifunac (2009) an example of dispersion curves is shown for a ground profile at El Centro, California. It can be seen from this figure that the higher the period of the waves the more the wave velocities contribute to rocking ground motion.…”

Section: Discussionmentioning

confidence: 99%

Rotational Seismic Load Definition in Eurocode 8, Part 6, for Slender Tower-Shaped Structures

Zembaty¹

2009

Bulletin of the Seismological Society of America

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This note describes the rotational seismic load definition as included in Part 6 of Eurocode 8 (EC8.6, 2005). The Eurocode 8, Part 6 (EC8.6, 2005), definition of the rotational ground-motion component depends upon the structural subsoil compliance, which is controlled by the shear-wave velocity in the top 30 m of ground. A comparison of the effects of the rocking ground motion and the horizontal ground motion on the response of a 160 m reinforced concrete chimney shows that for the Eurocode 8, Part 6 (EC8.6, 2005), definition of the rotational seismic ground motion, the rocking excitations contribute significantly to the overall response of the structure. The engineering code formulas for the rocking component of ground motion, however, should be calibrated and reconciled with the results of the latest empirical research.

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Section: Discussionmentioning

confidence: 99%

Rotational Seismic Load Definition in Eurocode 8, Part 6, for Slender Tower-Shaped Structures

Zembaty¹

2009

Bulletin of the Seismological Society of America

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“…The relationship between rotational response spectrum and the translational response spectrum has been studied for some earthquakes using elastic wave theory in frequency domain [10,11,41,47]. In Eurocode 8, part 6 (EC8.6) the seismic design of tower-shaped structures includes the rotational spectrum in terms of translational response spectrum [45].…”

Section: Engineering Applicationsmentioning

confidence: 99%

Engineering analysis of measured rotational ground motions at GVDA

Yin

Nigbor

Chen

et al. 2016

Soil Dynamics and Earthquake Engineering

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Characteristics of rotational earthquake ground motions and their effects on structural response are not yet well-defined. Recording rotational ground motions directly in free field is in its infancy, and simultaneous sixcomponent earthquake measurements are being accumulated slowly. A six-degree-of-freedom (6DOF) ground motion observation system was installed in the Garner Valley Downhole Array (GVDA), a very well-characterized and wellinstrumented geotechnical array in Southern California. Since 2008, six-component free-field earthquake ground motions have been recorded from hundreds of earthquakes with a relatively wide range of hypocentral distances and magnitudes. In this paper, analysis was conducted to develop the characteristics of these measured rotational ground motions. Linear relationships between peak rotation velocity and peak ground acceleration were found, similar to previous 6DOF measurements in Taiwan and Japan. Ratios of rotation to translation as a function of hypocentral distance show larger ground rotations at closer distance, and that rotational ground motions tend to attenuate more rapidly than corresponding translational ground motions. Measured rotational motions show differences from estimations using elastic plane wave theory when using simple local apparent wave velocities. Finally, preliminary empirical relationships for rotational response spectra are estimated for earthquake engineering applications.

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“…Today, the current methodology accumulation and computer software packages for example: NEQRISK (Lee and Trifunac, 1985); FRISK (McGuire, 2001); SEISRISK III (Bender and Perkins, 1987); STASHA (Kiremidjian et al, 1992), CRISIS2001 (Ordaz, 2001); and USGS applications (Frankel et al, 1996) are used in the analysis of seismic hazard. The SEISRISK III application was used to calculate the probabilistic seismic hazard of the area consisting of the districts of Fatih and Eminonu.…”

Section: The Softwarementioning

confidence: 99%

Probabilistic seismic hazard assessment of the historical peninsula of Istanbul

İnce

2012

Nat. Hazards Earth Syst. Sci.

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Abstract. In order to design buildings that are resistant to earthquakes, first it is necessary to determine the parameters of ground motion. In this study, the earthquake seismic hazard analysis of the Old City Districts of Istanbul (Fatih and Eminonu) was probabilistically defined. For the analysis, the study zone was divided into 307 cells of 250 × 250 m using geographical information systems, and these cells were used in the mapping of all the data obtained. Then, for a building lifetime of 50 yr, the acceleration parameters of earthquake ground motions, peak ground acceleration, peak ground velocity, and spectral acceleration values of 0.2 s and 1 s were obtained at the bedrock level according to 10 % and 40 % exceedances. Additionally, in order to produce the artificial acceleration-time records of the ground movement in accordance with the NEHRP acceleration spectrum, the TARSCHTS computer simulation program was utilized. The results of the analysis showed that for the 10 % probability of exceedance, the peak bedrock acceleration values ranged from 0.30 g to 0.40 g, and for the 40 % exceedance probability the acceleration values ranged from 0.22 g to 0.17 g. The S s 10 % exceedance probability, calculated according to the spectral acceleration parameter, ranged from 0.67 g to 0.85 g and the spectral acceleration parameter S 1 varied between 0.22 g-0.28 g. The S s 40 % exceedance probability, calculated according to the spectral acceleration parameter, ranged from 0.46 g to 0.38 g and the spectral acceleration parameter S 1 varied from 0.12 g to 0.14 g.

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Empirical Scaling of Rotational Spectra of Strong Earthquake Ground Motion

Cited by 40 publications

References 21 publications

Rotational Seismic Load Definition in Eurocode 8, Part 6, for Slender Tower-Shaped Structures

Rotational Seismic Load Definition in Eurocode 8, Part 6, for Slender Tower-Shaped Structures

Engineering analysis of measured rotational ground motions at GVDA

Probabilistic seismic hazard assessment of the historical peninsula of Istanbul

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