Simulation of near-field pulse-like ground motions using a correlated bimodal fractional stochastic model

Waezi, Zakariya; Balzadeh, Sara

doi:10.1016/j.soildyn.2022.107434

Cited by 7 publications

(5 citation statements)

References 33 publications

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“…These records generally lead to high spectral values and unusual shapes [23], [24]. Some response spectra compatible with the pulse-like near filed ground motions were proposed by Chen et al [25] and Waezi and Balzadeh [26]. It is worth noting that due to the lack of sufficient pulse-like near-field records, artificial ground motions were produced in most previous studies [23], [25].…”

Section: Introductionmentioning

confidence: 71%

Recommendation of new design spectra for Iran using modified Newmark method

Moghaddam,

Sanagar Darbani,

Sadrara

et al. 2024

Soil Dynamics and Earthquake Engineering

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Section: Introductionmentioning

confidence: 71%

Recommendation of new design spectra for Iran using modified Newmark method

Moghaddam,

Sanagar Darbani,

Sadrara

et al. 2024

Soil Dynamics and Earthquake Engineering

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“…It is found that the wavelets have been widely employed for the generation of velocity pulse. Among the wavelet-based methods, the Gabor wavelet velocity pulse model is the most popular in engineering, because it can be expressed by a simple mathematical function with few input parameters that have an unambiguous physical interpretation, and it has been demonstrated to be effective (Dickinson and Gavin, 2011; Khansefid and Bakhshi, 2022; Waezi and Balzadeh, 2022).…”

Section: Near-fault Pulse-like Ground Motionsmentioning

confidence: 99%

Reliability assessment for hybrid solar tower under near-fault pulse-like ground motions using Kriging surrogate and subset simulation

Ding

Bai

2023

Journal of Vibration and Control

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Concentrated solar towers are commonly designed as high-rise hybrid structures, which exhibit properties of non-uniform mass and rigidity along the height of the tower, and consequently are vulnerable to strong seismic ground motions. This study presents a comprehensive analysis of the seismic performance of a hybrid solar tower, which is one of the tallest hybrid solar towers in the world. The hybrid solar tower includes a reinforced concrete tube at the bottom and a steel-truss tube at the top and is subjected to near-fault pulse-like ground motions. A simulation technique that utilizes the stochastic point-source model and a velocity pulse model was introduced to generate stochastic pulse-like ground motions. The stochastic response of the hybrid solar tower to near-fault pulse-like ground motions was computed to estimate the tower’s reliability. To enhance the efficiency of reliability estimation, an algorithm combining the Kriging surrogate and subset simulation (K-SS) was presented. The aggregate response of the tower was found to be significantly more damaging over the border of the reinforced concrete tube and the steel-truss tube than below the border. The study found that the hybrid solar tower has a reliability of 90.53% when subjected to stochastic near-fault pulse-like ground motions with a peak ground acceleration of 0.62 g. The findings of this study contribute to the understanding of the seismic performance of high-rise hybrid solar towers under near-fault pulse-like ground motions.

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“…Other than the identification of pulse-like features, there are ever increasing demands for the parameterization of velocity pulses, for example, either in the stochastic simulation of near-fault motions, [37][38][39][40][41][42][43][44][45][46] or in the study regarding the influence of velocity pulses on engineered structures. [10][11][12][47][48][49][50][51][52][53] To parameterize the velocity pulse, there is a need of removing the high-frequency content that may hamper an automated extraction of the pulses of interest.…”

Section: Introductionmentioning

confidence: 99%

“…Because of its good property of yielding a closed-form expression for the response of the single-degree-of-freedom systems, it has been adopted in a variety of studies regarding, for example, the simulation of pulse motions as well as the analyses of dynamic response of structures to synthetic motions. 10,12,43,44,81 Other popular functions for matching recorded motions include but not limited to the modified Berlage wavelet, 68,82 the Gabor wavelet, 83 see Ref. 74 for a summary.…”

Section: Introductionmentioning

confidence: 99%

“…Mavroeidis and Papageorgiou 74 proposed a modified Gabor wavelet function to represent the pulse‐like features; this function is shown capable of simulating near‐fault motions not only in the time domain but also in the frequency domain. Because of its good property of yielding a closed‐form expression for the response of the single‐degree‐of‐freedom systems, it has been adopted in a variety of studies regarding, for example, the simulation of pulse motions as well as the analyses of dynamic response of structures to synthetic motions 10, 12, 43, 44, 81 . Other popular functions for matching recorded motions include but not limited to the modified Berlage wavelet, 68,82 the Gabor wavelet, 83 see Ref.…”

Section: Introductionmentioning

confidence: 99%

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Automated parameterization of velocity pulses in near‐fault ground motions

Chang,

Wu,

Goda

2023

Earthq Engng Struct Dyn

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Proper parameterization of near‐fault ground motions is of critical importance in earthquake engineering, and this process is traditionally performed by directly fitting an analytical pulse model to the original motion. Yet such a process is usually limited by the trial‐and‐error procedure, which is strongly dependent on the initial guesses and may converge to local rather than global minimums. In this study, we propose a progressive (step‐by‐step) iterative approach that can achieve a fully automated parameterization of the velocity pulse contained in near‐fault motions. Assuming that a velocity pulse can be characterized by a pulse model with four key parameters, the approach is conducted by iteratively matching the pulse model to the smoothed ground motion, and the parameterized pulse is analytically derived by best fitting to the smoothed motion not only in the time domain but also in the spectral domain. Specifically, the velocity time history of interest is initially smoothed by a moving average filter so that the low‐frequency content can be filtered out of the original motion, from which the pulse amplitude as well as its epoch is accordingly determined. The coherent velocity pulse is then progressively extracted by performing the nonlinear least‐square‐fitting of the pulse model to the filtered low‐frequency content, during which the remaining parameters, that is, the pulse period, the number of cycles and the phase of the pulse, are estimated successively. Finally, the above procedure is applied repeatedly to the original ground motion by changing an empirical factor controlling the extent of smoothing of the motion so that convergence to local minimums that frequently occurs in the trial‐and‐error procedure could be largely avoided, and best match of the spectrum of the extracted pulse to that of the original motion can be acquired. Fitting quality of the velocity pulses is examined by comparing with existing methods. Prospective applications of the proposed procedure include the stochastic simulations of near‐fault ground motions and parametric investigations of the influence of velocity pulses on various engineered structures.

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Simulation of near-field pulse-like ground motions using a correlated bimodal fractional stochastic model

Cited by 7 publications

References 33 publications

Recommendation of new design spectra for Iran using modified Newmark method

Recommendation of new design spectra for Iran using modified Newmark method

Reliability assessment for hybrid solar tower under near-fault pulse-like ground motions using Kriging surrogate and subset simulation

Automated parameterization of velocity pulses in near‐fault ground motions

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