Comparison of fully non-stationary artificial accelerogram generation methods in reproducing seismicity at a given site

Colajanni, Piero; Pagnotta, Salvatore; Testa, Gabriele

doi:10.1016/j.soildyn.2020.106135

Cited by 10 publications

(7 citation statements)

References 20 publications

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“…To better show the energy variation of the ground motion in each group, the Husid function [57] of all the motions in three groups and two scenarios are evaluated. The Husid function, which is equivalent to the normalized build up of Arias intensity, can be used to constrain the temporal nonstationarity of acceleration time history over time duration [36,43]. For instance, the strong-motion duration can be defined as the time during 0.05 ≤ ( ) ≤ 0.95 [28].…”

Section: Nonstationarities Of Spectrum-compatible Ground Motionsmentioning

confidence: 99%

“…For single-degree-of-freedom systems, Iervolino et al [ 11] show some artificial ground-motion models produce biased engineering demand parameters (EDPs); Tsioulou et al [40,41] developed modification methods for a stochastic ground-motion model that can produce similar EDP distribution with that produced by records [42]. While, for multiple-degree-of-freedom systems, stochastic models that can faithfully reproduce the hysteretic energy dissipated by structures compared with records are still unavailable [43]. Therefore, it is urgent to develop a stochastic model that can well control the nonstationary features of ground motion.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Nonstationarities Of Spectrum-compatible Ground Motionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Wang

Risi

et al. 2021

Earthq Engng Struct Dyn

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“…e spectrumcompatibility criterion selected in this paper refers to related research [29][30][31][32], and when selecting ground motion, the three factors of amplitude, spectrum characteristics, and duration should be considered comprehensively. e details are as follows.…”

Section: Selected Ground Motionmentioning

confidence: 99%

Seismic Fragility Analysis of Multispan Continuous Girder Bridges with Varying Pier Heights considering Their Bond‐Slip Behavior

Cao

Liang

Huai

et al. 2020

Advances in Civil Engineering

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The bond-slip effect has a great influence on the seismic performance of reinforced concrete structures and ignoring it will overestimate the seismic performance of the structures. Based on the low-cyclic reversed loading experiment of a reinforced concrete column, this paper uses OpenSees to establish a nonlinear finite element model considering bond-slip and verify its correctness. In this paper, a multispan continuous girder bridge with varying pier heights is taken as an example. Considering the effect of the bond-slip behavior of steel bars, a refined finite element model based on the OpenSees platform is established to do the numerical simulation analysis. 10 seismic waves are selected from the Pacific Earthquake Engineering Research Center (PEER) according to the site condition and modulate the amplitude to 150 waves. This paper uses the incremental dynamic analysis (IDA) and the second-order reliability method to analyze the seismic fragility of bridge components and systems, respectively. Results show that the exceeding probability increases obviously when considering bond-slip, and with the increase of seismic spectral acceleration, the influence of bond-slip on the exceeding probability of components also increases; when bond-slip is considered, the difference of system fragility between the upper and lower limits under four damage states is greater than that without bond-slip.

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“…Al-Baadani and Al-Shameri [58] investigated several IMs for evaluation of the seismic response of RC frame minarets and concluded that the optimal IM for these structures is S A (T 1 , 2T 1 ) which defines as the geometric mean of the spectral accelerations at T 1 and 2T 1 . Colajanni et al [59] carried out a correlation study between interstory drift ratios and three different intensity measure parameters, including PGA, PGV, and S A (T 1 ) in irregular RC structures. e results of their study confirmed that PGV is highly correlated to drift responses, and as a result, it is more efficient than PGA and S A (T 1 ).…”

Section: E Optimal Intensity Measurementioning

confidence: 99%

The Effect of Foundation Flexibility on Probabilistic Seismic Performance of Plan‐Asymmetric Buildings with Different Strength Distributions

Osalu

Shakib

2020

Advances in Civil Engineering

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In this research, the probabilistic seismic performance of asymmetric reinforced concrete wall-frame buildings with different strength distributions incorporating foundation flexibility effects is examined. By using probability-based performance evaluation approach, it is possible to provide a more accurate prediction of the different strength distribution effect on the seismic performance of asymmetric buildings and find the most efficient strength distribution for meeting each performance level. These efficient distributions can be adopted in the performance-based design of asymmetric buildings. For this purpose, first, the regression analysis and the concepts of efficiency and sufficiency were used to determine an optimal intensity measure (IM) for incremental dynamic analysis and evaluating the seismic response of the considered building models. Then, the proper magnitude of interstory drift capacity for this type of buildings in each limit state was estimated using the damage index concept. Finally, the effects of different strength distributions and the flexibility of foundation were studied on the seismic performance of the asymmetric buildings by investigating the mean annual frequencies of exceeding structural performance levels and confidence levels to satisfy performance objectives. It is concluded that irregular distributions of stiffness and strength in the plan of a building highly affect the seismic performance of buildings. Also, the results show that the optimum strength distribution is a function of the objective performance level and these optimum strength distributions are the same for both fixed- and flexible-base conditions. Meanwhile, the flexible effect of foundation increases the mean annual frequencies of exceedance within the range of 10% to 45% and significantly decreases the confidence levels in most cases.

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Comparison of fully non-stationary artificial accelerogram generation methods in reproducing seismicity at a given site

Cited by 10 publications

References 20 publications

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

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

Seismic Fragility Analysis of Multispan Continuous Girder Bridges with Varying Pier Heights considering Their Bond‐Slip Behavior

The Effect of Foundation Flexibility on Probabilistic Seismic Performance of Plan‐Asymmetric Buildings with Different Strength Distributions

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