Influence of earthquake duration on the response of steel moment frames

Bravo‐Haro, Miguel A.; Elghazouli, A.Y.

doi:10.1016/j.soildyn.2018.08.027

Cited by 53 publications

(28 citation statements)

References 28 publications

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“…These thresholds can include: 5 seconds [35] [37] as well as 35 [2] seconds. However, the geometrical mean significant duration of short-duration earthquakes in these studies is less than 15 seconds and varies from 6 (with a threshold of 20 seconds [4]) to 8.68 (with a threshold of 25 seconds [36]) and 14 seconds (with a 35-sec threshold [38]). In this study, the geometrical mean significant duration of the selected short-duration records is set to be 13.8 and is kept as close as possible to the corresponding threshold in INBC-i.e., the 10 seconds.…”

Section: Dividing Ground Motions Into Long and Short Setsmentioning

confidence: 78%

Influence of Ground Motion Duration on the Structural Response at Multiple Seismic Intensity Levels

Harati

Mashayekhi

Barmchi

et al. 2019

NMCE

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This paper aims to investigate the effects of motion duration on the structural seismic demands, seeking potential correlations between motion durations and structural responses at several seismic intensity levels. Three seismic intensity levels with 100years, 475years, and 2475years earthquake return periods (RPs) are first considered for correlation computations. Spectrally matched ground motions are employed to isolate the contribution of duration from the effects of ground motion amplitudes and response spectral shape. Four single degree of freedom systems derived from four real reinforced concrete structures are studied, where both degrading and non-degrading equivalent SDOF systems are included for structural modeling. Results show a low positive correlation between motion duration and structural displacement demand, but this correlation increases with an increase in earthquake RP. It is also investigated whether or not this insignificant positive correlation has an impact on the incremental dynamic analysis curves. The spectrally matched ground motions are divided into two distinct groups in this case: short and long duration ground motions. The comparison of incremental dynamic analysis of these two groups at the collapse limit reveals that long-duration ground motions can cause up to a 20 percent decrease in the spectral acceleration demand of considered structural systems.

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Section: Dividing Ground Motions Into Long and Short Setsmentioning

confidence: 78%

Influence of Ground Motion Duration on the Structural Response at Multiple Seismic Intensity Levels

Harati

Mashayekhi

Barmchi

et al. 2019

NMCE

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“…Significant advances on the topic have been recently made due to the increasing availability of reliable long-duration ground-motion records and improved deteriorating nonlinear structural models incorporating the destabilising P-Δ effects (e.g., [2], [6]). These studies focused primarily on the influence of ground-motion duration on structural collapse capacity and structural collapse risk, using novel ground-motion selection procedures to isolate the effects of duration from the response spectral shape by using "spectrally equivalent" long-and shortduration ground-motion records.…”

Section: Introductionmentioning

confidence: 99%

Investigating Ground-Motion Duration Effects on Building Portfolio Loss Estimates

Otárola¹,

Gentile²,

Sousa³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Earthquake-induced ground-motion duration can be an important factor to consider when assessing ground-motion damage potential, as evidenced by recent earthquake events worldwide. In current practice, duration is commonly relegated to implicit, qualitative considerations. This study introduces a framework to explicitly quantify the influence of duration on building portfolio direct economic losses. To this end, a simulation-based probabilistic risk modelling framework is developed for different synthetic building portfolios impacted by a case-study seismic source. Two building typologies, representative of distinct vulnerability classes in southern Europe, are considered. A simulation-based probabilistic seismic hazard analysis is performed, explicitly simulating duration jointly with spectral-shape-related intensity measures. Sets of long and one-to-one spectrally-equivalent short duration ground-motion records are selected and then used jointly to perform nonlinear dynamic analysis and derive fragility models for each considered building typology. Fragility relationships are derived by using average spectral acceleration as the primary intensity measure and: 1) maximum inter-storey drift ratio as a demand parameter, indirectly accounting for ground-motion duration (through the adopted nonlinear modelling strategy); 2) maximum inter-storey drift ratio as demand parameter, explicitly considering duration as an intensity measure together with spectral shape, in a vectorvalued format. For each case, vulnerability models are developed by combining the fragility relationships with a building-level damage-to-loss model. The portfolio expected annual losses estimated using the described vulnerability models are critically compared and discussed. Depending on the location/portfolio, the impact of ground-motion duration can be significant, and the proposed approaches allow an analyst to account for it in a practical way.

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“…In this regard, using spectrally equivalent ground motion pairs for isolating the effect of duration has made available a more robust way of analyzing ground motions for nonlinear dynamic analyses since the spectral content is almost not altered [21,22]. More recent investigations employing numerical models that captured structural components' degradation have shown that long-duration ground motions can induce higher deformations and affect the structural collapse capacity [22][23][24][25]. Chandramohan et al [22] presented results showing that longduration records induce higher deformations for large shaking intensities.…”

Section: Introductionmentioning

confidence: 99%

“…is result agrees with the conclusions reported by Raghunandan and Liel [23] since structural systems with low ductile capacity are not influenced by earthquake duration due to the inability to reach large deformations and dissipate energy before failure. Bravo-Haro and Elghazouli [25] analyzed 50 steel moment frames through detailed nonlinear dynamic analysis using a suite of 77 spectrally equivalent pairs of short and long earthquake records. Similar to previous studies, they reported that the effects of duration are significant for structures showing high rate of cyclic degradation levels.…”

Section: Introductionmentioning

confidence: 99%

Effect of Earthquake Ground Motion Duration on the Seismic Response of a Low‐Rise RC Building

Martineau

Lopez

Vielma

2020

Advances in Civil Engineering

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This paper investigates the effect of earthquake ground motion duration on the seismic response of a low-rise reinforced concrete shear wall building. Two sets of spectrally equivalent ground motion sets were determined to isolate the effect of duration from other earthquake record characteristics. A numerical model that accounts for P-delta effects and degradation of strength and stiffness of the structural elements was used. Detailed nonlinear dynamic analysis for both the design and collapse levels of shaking was performed, considering the spectral acceleration at the fundamental period of vibration with intensity measure and material strains as engineering demand parameters. The results showed that at the design level of shaking, slightly larger interstory drifts were obtained under the short-duration events. However, the maximum values for interstory drifts were small, and minor damage is expected in the structure. When both seismic record sets were incrementally scaled until collapse, a slight increase in the material strains was found under the short-duration seismic events. Overall, it is indicated that ground motion duration does not influence the seismic response of low-rise buildings with low deformation capacity.

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Influence of earthquake duration on the response of steel moment frames

Cited by 53 publications

References 28 publications

Influence of Ground Motion Duration on the Structural Response at Multiple Seismic Intensity Levels

Influence of Ground Motion Duration on the Structural Response at Multiple Seismic Intensity Levels

Investigating Ground-Motion Duration Effects on Building Portfolio Loss Estimates

Effect of Earthquake Ground Motion Duration on the Seismic Response of a Low‐Rise RC Building

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