A Site-specific ground-motion simulation model: Application for Vrancea earthquakes

Radu, Alin; Grigoriu, Mircea

doi:10.1016/j.soildyn.2018.04.025

Cited by 19 publications

(20 citation statements)

References 48 publications

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Section: Seismic Hazardmentioning

confidence: 99%

“…Parameters α , β , γ in Equation and the duration 0 ≤ t ≤ t f are also functions of ( m , r ), and are outputs of the SBM. The model in Equation is a simplified version of the ground‐motion model introduced by Radu and Grigoriu …”

Section: Seismic Hazardmentioning

confidence: 99%

“…Figure b shows the probability distribution function of the kurtosis κ for the type‐C National Earthquake Hazard Reduction Program (NEHRP) soil, similar to the soil assumed for this study. The distribution of Z ( t ) is calibrated to the average kurtosis coefficient corresponding to type‐C NEHRP soil κ C = 14.3 > >3 as shown by Radu and Grigoriu …”

Section: Seismic Hazardmentioning

confidence: 99%

“…The (m, r) distribution of the seismic hazard is essential in the seismic design of structures because the frequency content of the ground motions depends on (m, r), among other characteristics, such as local site conditions or seismic regime. 29,64 The distribution of earthquakes by (m, r) is obtained from the UHT 65 from the United States Geological Survey. This online tool provides the contribution of the seismic sources characterized by (m, r) for a specified level of the seismic intensity (e.g., the spectral acceleration) at each site in the United States.…”

Section: Seismic Hazardmentioning

confidence: 99%

“…The model in Equation 3 is a simplified version of the ground-motion model introduced by Radu and Grigoriu. 64 The advantage of using the model in Equation 3 is due to the fact that it preserves the realistic non-Gaussian character of earthquakes, a feature usually not considered in other models. 31,72 The non-Gaussianity of real earthquakes is supported by the results in Figure 3a, which show that the kurtosis coefficient as a function of v s30 for the ground motions in the NGA-West data set 73 is greater than 3, the characteristic value for Gaussian processes.…”

Section: Ground-motion Simulationmentioning

confidence: 99%

See 4 more Smart Citations

Performance‐based seismic design of tuned inerter dampers

Radu

Lazar

Neild

2019

Struct Control Health Monit

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Summary This paper proposes a novel fully probabilistic framework for the performance‐based seismic design of structures and uses tuned inerter dampers (TID) installed in civil engineering structures subjected to seismic loads to illustrate its applicability. The framework proposed is based on stochastic reduced‐order models, which makes it computationally efficient and can be used for the design of TIDs installed in any complex nonlinear structures subjected to general nonstationary, non‐Gaussian stochastic processes. In this study, the TID is installed in a multi‐degree‐of‐freedom nonlinear structure that is subjected to synthetic seismic records. Numerical results show that the framework proposed is able to provide rigorous and robust values for the parameters of the TID. The design parameters obtained using the stochastic framework proposed are compared with benchmark deterministic approaches, tested also for a large data set of ground‐motion real records. It is shown that the stochastic approach provides insightful designs of the TID that are consistent with the site seismicity and the frequency content of the stochastic excitation.

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Section: Seismic Hazardmentioning

confidence: 99%

Section: Seismic Hazardmentioning

confidence: 99%

Section: Seismic Hazardmentioning

confidence: 99%

Section: Seismic Hazardmentioning

confidence: 99%

Section: Ground-motion Simulationmentioning

confidence: 99%

See 3 more Smart Citations

Performance‐based seismic design of tuned inerter dampers

Radu

Lazar

Neild

2019

Struct Control Health Monit

Self Cite

View full text Add to dashboard Cite

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A new energy‐compatible nonstationary stochastic ground‐motion simulation method

Wang

Risi

et al. 2021

Earthq Engng Struct Dyn

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A new time-frequency modulating function with a novel equivalent averageintensity envelope based on the instantaneous energy is proposed to simulate fully nonstationary ground motions. The new model utilizes simple, uncoupled, and statistically well-studied temporal and spectral nonstationary parameters. Then, a period-by-period simulation method based on the proposed stochastic model is developed to match multiple targets. A numerical comparison shows that the new method replicates well both the target temporal and spectral nonstationarities and it is efficient and easy to use in engineering practice. This study also demonstrates that for obtaining site-specific seismic input by means of site response analysis: (1) the frequency contents of bedrock motion, including the energy concentration in terms of frequency and frequency decaying with respect to time, have a significant impact on the site response with moderate and large PGA levels; (2) using the proposed instantaneous-frequency-related time modulating function to approximate the real ground motion leads to results sufficiently close to the record for nonlinear site response regardless PGA levels and site condition. Therefore, attention should be paid to the change of nonstationary characteristics of ground-motion frequency according to the source, path, and site condition when simulating ground motion on bedrock. As the proposed methods can approximately control various ground-motion characters, different targets of ground-motion simulation can be matched for different engineering purpose such as site response analysis, time-history analysis of special structures, etc.

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Simulating nonstationary and non‐Gaussian vector ground motions with time‐ and frequency‐dependent lagged coherence

Cui

Hong

2021

Earthq Engng Struct Dyn

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Seismic ground motions at multiple sites are nonstationary and non‐Gaussian with potentially time‐ and frequency‐dependent coherence, although the nonstationarity or non‐Gaussian or time‐dependent coherence aspects are often neglected because of lack of algorithm or method to take all these aspects into account to simulate synthetic ground motion records at multiple sites. In the present study, an iterative power and amplitude correction algorithm is proposed to simulate the nonstationary and non‐Gaussian vector process and takes into account time‐ and frequency‐dependent coherence. The algorithm usually converges within 10 iterations. It can be viewed as the extension of the well‐known iterative amplitude adjust Fourier transform algorithm for generating a vector of surrogates. The proposed algorithm uses the S‐transform and discrete orthonormal S‐transform rather than the ordinary Fourier transform. The adequacy of the proposed algorithm is validated numerically by using simulated ground motions.

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A Site-specific ground-motion simulation model: Application for Vrancea earthquakes

Cited by 19 publications

References 48 publications

Performance‐based seismic design of tuned inerter dampers

Performance‐based seismic design of tuned inerter dampers

A new energy‐compatible nonstationary stochastic ground‐motion simulation method

Simulating nonstationary and non‐Gaussian vector ground motions with time‐ and frequency‐dependent lagged coherence

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