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

Zembaty, Zbigniew

doi:10.1785/0120080252

Cited by 33 publications

(14 citation statements)

References 5 publications

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“…Their potential field of application is multifaceted and involves geophysical exploration, hazard assessment, and seismic engineering [e.g., Takeo, 1998;Wang et al, 2009;Stupazzini et al, 2009;Zembaty, 2009], as well as seismic tomography where the joint processing of translation and rotation data produces unique seismic observables with local sensitivities surrounding the receiver Bernauer et al, 2009Bernauer et al, , 2012b.…”

Section: Nonuniqueness In Finite Source Inversionsmentioning

confidence: 99%

Reducing nonuniqueness in finite source inversion using rotational ground motions

2014

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We assess the potential of rotational ground motion recordings to reduce nonuniqueness in kinematic source inversions, with emphasis on the required measurement accuracy of currently developed rotation sensors. Our analysis is based on synthetic Bayesian finite source inversions that avoid linearizations and provide a comprehensive quantification of uncertainties and trade-offs. Using the fault and receiver geometry of the Tottori 2000 earthquake as a test bed, we perform inversions for two scenarios: In scenario I, we use translational velocity recordings only. In scenario II, we randomly replace half of the velocity recordings by rotation recordings, thus keeping the total amount of data constant. To quantify the noise-dependent impact of rotation recordings, we perform a sequence of inversions with varying noise levels of rotations relative to translations. Our results indicate that the incorporation of rotational ground motion recordings can significantly reduce nonuniqueness in finite source inversions, provided that measurement uncertainties are similar to or below the uncertainties of translational velocity recordings. When this condition is met, rupture velocity and rise time benefit most from rotation data. The trade-offs between both parameters are then strongly reduced, and the information gain nearly doubles. This suggests that rotational ground motion recordings may improve secondary inferences that rely on accurate information about rise time and rupture velocity. These include frictional properties of the fault, radiation directivity, and ground motion in general.

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Section: Nonuniqueness In Finite Source Inversionsmentioning

confidence: 99%

Reducing nonuniqueness in finite source inversion using rotational ground motions

2014

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“…Their results show that, at long periods, the PSV spectral amplitudes tend toward an asymptote with amplitude proportional to the maximum rocking angle of ground motion. Zembaty (2009b) describes the rotational seismic load provisions in the European seismic code EC8.6 for towers, masts, and chimneys, and he concludes that the engineering code formulas should be calibrated and reconciled with the results of the latest empirical research on the rocking component of ground motion.…”

Section: Articles and Short Notesmentioning

confidence: 99%

Introduction to the Special Issue on Rotational Seismology and Engineering Applications

Lee¹,

Çelebi²,

Todorovska³

et al. 2009

Bulletin of the Seismological Society of America

165

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Rotational seismology is an emerging field for studying all aspects of rotational ground motions induced by earthquakes, explosions, and ambient vibrations. It is of interest to a wide range of geophysical disciplines, including strong-motion seismology, broadband seismology, earthquake engineering, earthquake physics, seismic instrumentation, seismic hazards, seismotectonics, and geodesy, as well as to physicists using Earth-based observatories for detecting gravitational waves generated by astronomical sources (predicted by Einstein in 1916). In this introduction to the BSSA special issue on rotational seismology and engineering applications, we will include (1) some background information, (2) a summary of the recent events that led to this special issue, and (3) an overview of its 51 papers-27 articles, 11 short notes, 4 reviews, 6 tutorials, and 3 supplementary articles. Our comments on these 51 papers are very brief and give just a hint of what the papers are about.Papers in this special issue demonstrate that earthquake monitoring cannot be limited to measuring only the three components of translational motion. We also need to simultaneously measure the three components of rotational motion and the many components of strains. A golden opportunity to improve our understanding of earthquakes lies in the near field of large earthquakes (within about 25 km of the earthquake ruptures), where nonlinear rock and soil response influences ground motions in a complicated way. Some Background InformationRotational effects of earthquake waves together with rotations caused by soil-structure interaction (e.g., in chimneys, monuments, or tombstones rotated on their supports) have been observed for centuries. A few early authors proposed rotational waves or at least some vortical motions. Some of these early observations, however, might have resulted from ground rocking caused by soil-structure interaction. Some early seismic instruments designed to detect and to record earthquake shaking also included the rocking of ground motion because it was believed that earthquakes were caused by explosions in the Earth (Trifunac, 2008). As summarized by Ferrari (2006), two models of an electrical seismograph with sliding smoked paper were developed by P. Filippo Cecchi (1822-1887) to record three-component translation motions and also the torsion movements from earthquakes. Although these instruments operated for several years, no rotational motion could be recorded because of low transducer sensitivity.Mallet (1862) proposed that rotations of a body on the Earth's surface are due to a sequence of different seismic phases emerging under different angles. Reid (1910) studied this phenomenon, which was observed in the 1906 San Francisco earthquake, and pointed out that the observed rotations are too large to be produced by waves of elastic distortion. Such waves "produce very small rotations, whose maximum amount, … is given by the expression 2πA=λ, where A is the amplitude and λ the wave-length; with a wave as short as 10...

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“…Rotational response spectrum: A plot of maxima of rotational responses of oscillators as a function of their natural periods (or frequencies). It is generalized from the conventional, translational response spectrum (see, e.g., Kalkan and Graizer, 2007;Zembaty, 2009b). Rotational seismic solitons: A finite number of rotational pulses excited in the earthquake source; they can have a form of spin or twist solitons (see Majewski, , 2008.…”

Section: Glossary Termsmentioning

confidence: 99%

A Glossary for Rotational Seismology

Lee¹

2009

Bulletin of the Seismological Society of America

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

Cited by 33 publications

References 5 publications

Reducing nonuniqueness in finite source inversion using rotational ground motions

Reducing nonuniqueness in finite source inversion using rotational ground motions

Introduction to the Special Issue on Rotational Seismology and Engineering Applications

A Glossary for Rotational Seismology

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