Engineering analysis of strong ground rocking and its effect on tall structures

Bońkowski, Piotr; Zembaty, Zbigniew; Minch, M.

doi:10.1016/j.soildyn.2018.10.026

Cited by 26 publications

(16 citation statements)

References 36 publications

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“…In fact, the structural response of buildings to rotational motions is widely unknown [103]. Despite indications that damage caused by rotational motions might be significant [104][105][106][107][108][109][110], earthquake hazard assessment was until recently almost exclusively based on the analysis of translational motion. Especially in the near-field of earthquakes, rotational motion amplitudes can be significant, e.g., Reference [5,111,112], with a large potential for damage.…”

Section: Earthquake Engineeringmentioning

confidence: 99%

Seismological Processing of Six Degree-of-Freedom Ground-Motion Data

Sollberger

Igel

Schmelzbach

et al. 2020

Sensors

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Recent progress in rotational sensor technology has made it possible to directly measure rotational ground-motion induced by seismic waves. When combined with conventional inertial seismometer recordings, the new sensors allow one to locally observe six degrees of freedom (6DOF) of ground-motion, composed of three orthogonal components of translational motion and three orthogonal components of rotational motion. The applications of such 6DOF measurements are manifold—ranging from wavefield characterization, separation, and reconstruction to the reduction of non-uniqueness in seismic inverse problems—and have the potential to revolutionize the way seismic data are acquired and processed. However, the seismological community has yet to embrace rotational ground-motion as a new observable. The aim of this paper is to give a high-level introduction into the field of 6DOF seismology using illustrative examples and to summarize recent progress made in this relatively young field. It is intended for readers with a general background in seismology. In order to illustrate the seismological value of rotational ground-motion data, we provide the first-ever 6DOF processing example of a teleseismic earthquake recorded on a multicomponent ring laser observatory and demonstrate how wave parameters (phase velocity, propagation direction, and ellipticity angle) and wave types of multiple phases can be automatically estimated using single-station 6DOF processing tools. Python codes to reproduce this processing example are provided in an accompanying Jupyter notebook.

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Section: Earthquake Engineeringmentioning

confidence: 99%

Seismological Processing of Six Degree-of-Freedom Ground-Motion Data

Sollberger

Igel

Schmelzbach

et al. 2020

Sensors

View full text Add to dashboard Cite

show abstract

“…Many authors have contributed to the research on seismic rotational components (see, e.g., [1][2][3][4][5][6]). New procedures were developed on how to describe this seismic ground motion and how to quantify its effects on the structural response (see, e.g., [7][8][9][10][11][12][13][14]. The seismic rotational components can be deduced from:…”

Section: Introductionmentioning

confidence: 99%

“…The rocking response spectrum proposed in Eurocode 8 Part 6 for slender structures was compared with seismic time history response analyses of an R/C chimney, yielding its substantial conservatism compared with the time history response computations using real records of 6-DOF strong ground motion [10]. Time-history analyses with real measured seismic records are therefore very important for future calibrations of seismic design codes using response spectrum approach.…”

Section: Introductionmentioning

confidence: 99%

Parametric Analysis of Rotational Effects in Seismic Design of Tall Structures

et al. 2021

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This paper uses a parametric study to evaluate the significance of the rotational components of Earth’s motion in a seismic design. The parametric study is based on the procedures included in Eurocode 8, Part 6. Although the answer to the question of when the effects of rotational components are important is quite a complex one and requires a more in-depth study, our aim was to try to assess this question in a relatively quick manner and with acceptable accuracy. The first part of the paper is devoted to derivation of a simple formula that can be used for expressing the importance of rotational components in comparison with the classic seismic design without their usage. The quasi-static analysis, assuming inertial forces, is used. A crucial role plays the shape of the fundamental mode of the vibration. Due to simplicity reasons, well-known expression for estimation of the first eigenmode as an exponential function with different power coefficients that vary for different types of buildings is used. The possibility of changing the soil parameters is subsequently included into the formula for estimation of the fundamental frequency of tall buildings. In the next part, the overall seismic analyses of complex FEM models of 3D buildings and chimneys are performed. The results from those analyses are then compared with those from simplified calculations. The importance of the soil characteristics for determination of whether it is necessary to take into account the rotational effects is further discussed.

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“…This is due to the fact that records of earthquakes with high magnitude allow determining the rotation rate and the general characteristics of 6-DOF (six-degrees-of-freedom) motion. Then, information contained in the rotational component of the seismic wave was used for more specified purposes, such as seismic response analysis of complex structures like mining shafts [24][25][26], preliminary analyses of rotation rate in the regions of mining-induced seismicity [16,17,27], and physics of earthquakes as well [28,29]. Also, research works related to detecting gravitational waves generated by astronomical sources were conducted [30,31].…”

Section: Introductionmentioning

confidence: 99%

Near-Field Measurement of Six Degrees of Freedom Mining-Induced Tremors in Lower Silesian Copper Basin

Fuławka

Pytel

Pałac-Walko

2020

Sensors

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The impact of seismicity on structures is one of the key problems of civil engineering. According to recent knowledge, the reliable analysis should be based on both rotational and translational components of the seismic wave. To determine the six degrees of freedom (6-DoF) characteristic of mining-induced seismicity, two sets of seismic posts were installed in the Lower Silesian Copper Basin, Poland. Long-term continuous 6-DoF measurements were conducted with the use of the R-1 rotational seismometer and EP-300 translational seismometer. In result data collection, the waveforms generated by 39 high-energy seismic events were recorded. The characteristic of the rotational component of the seismic waves were described in terms of their amplitude and frequency characteristics and were compared with translational measurements. The analysis indicated that the characteristic of the rotational component of the seismic wave differs significantly in comparison to translational ones, both in terms of their amplitude and frequency distribution. Also, attenuation of rotational and translational components was qualitatively compared. Finally, the empirical formulas for seismic rotation prediction in the Lower Silesian Copper Basin were developed and validated.

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Engineering analysis of strong ground rocking and its effect on tall structures

Cited by 26 publications

References 36 publications

Seismological Processing of Six Degree-of-Freedom Ground-Motion Data

Seismological Processing of Six Degree-of-Freedom Ground-Motion Data

Parametric Analysis of Rotational Effects in Seismic Design of Tall Structures

Near-Field Measurement of Six Degrees of Freedom Mining-Induced Tremors in Lower Silesian Copper Basin

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