Quantifying the Influence of Ground Motion Duration on Structural Collapse Capacity Using Spectrally Equivalent Records

Chandramohan, Reagan; Baker, Jack W.; Deierlein, Gregory G.

doi:10.1193/122813eqs298mr2

Cited by 256 publications

(270 citation statements)

References 38 publications

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“…Chandramohan et al found that, compared with other measures, significant duration ( D s ) was the most suitable IM for ground‐motion duration. Significant duration is defined as the time between two target values of the integral,

true {true\int}_{0}^{t_{max}} a_{g} {(t)}^{2} d t

, where a g is the ground acceleration, and t max is the total duration of the record.…”

Section: Existing Ims For Duration and Spectral Shapementioning

confidence: 99%

Ductility‐dependent intensity measure that accounts for ground‐motion spectral shape and duration

Marafi

Berman²,

Eberhard³

2015

Earthq Engng Struct Dyn

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SUMMARYThe calculated nonlinear structural responses of a building can vary greatly, even if recorded ground motions are scaled to the same spectral acceleration at a building's fundamental period. To reduce the variation in structural response at a particular ground-motion intensity, this paper proposes an intensity measure (IM comb ) that accounts for the combined effects of spectral acceleration, ground-motion duration, and response spectrum shape. The intensity measure includes a new measure of spectral shape that integrates the spectrum over a period range that depends on the structure's ductility. The new IM is efficient, sufficient, scalable, transparent, and versatile. These features make it suitable for evaluating the intensities of measured and simulated ground motions.The efficiency and sufficiency of the new IM is demonstrated for the following: (i) elastic-perfectly plastic single-degree-of-freedom (SDOF) oscillators with a variety of ductility demands and periods; (ii) ductile and brittle deteriorating SDOF systems with a variety of periods; and (iii) collapse analysis for 30 previously designed frames. The efficiency is attributable to the inclusion of duration and to the ductility dependence of the spectral shape measure. For each of these systems, the transparency of the intensity measure made it possible to identify the sensitivity of structural response to the various characteristics of the ground motion. Spectral shape affected all structures, but in particular, ductile structures. Duration only affected structures with cyclic deterioration.

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true {true\int}_{0}^{t_{max}} a_{g} {(t)}^{2} d t

, where a g is the ground acceleration, and t max is the total duration of the record.…”

Section: Existing Ims For Duration and Spectral Shapementioning

confidence: 99%

Ductility‐dependent intensity measure that accounts for ground‐motion spectral shape and duration

Marafi

Berman²,

Eberhard³

2015

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

show abstract

“…Because of the increase in available ground motion data from recent subduction zone earthquakes, mainly from Japan and Chile, ground motion records from large subduction zone megathrust earthquakes can now be used . To isolate the effects of ground motion duration, Foschaar et al , and Chandramohan et al , , for example, selected ground motions with similar spectral shape and studied the relationship between the response and different intensity measures of ground motion duration.…”

Section: Introductionmentioning

confidence: 99%

Influence of earthquake ground‐motion duration on damage estimation: application to steel moment resisting frames

Barbosa

Ribeiro

Neves

2016

Earthq Engng Struct Dyn

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SUMMARYThis paper presents an analytical study evaluating the influence of ground motion duration on structural damage of 3-story, 9-story, and 20-story SAC steel moment resisting frame buildings designed for downtown Seattle, WA, USA, using pre-Northridge codes. Two-dimensional nonlinear finite element models of the buildings are used to estimate the damage induced by the ground motions. A set of 44 ground motions is used to study the combined effect of spectral acceleration and ground motion significant duration on drift and damage measures. In addition, 10 spectrally equivalent short-duration shallow crustal ground motions and long-duration subduction zone records are selected to isolate duration effect and assess its effect on the response. For each ground motion pair, incremental dynamic analyses are performed at at least 20 intensity levels and response measures such as peak interstory drift ratio and energy dissipated are tracked. These response measures are combined into two damage metrics that account for the ductility and energy dissipation. Results indicate that the duration of the ground motion influences, above all, the combined damage measures, although some effect on drift-based response measures is also observed for larger levels of drift. These results indicate that because the current assessment methodologies do not capture the effects of ground motion duration, both performance-based and code-based assessment methodologies should be revised to consider damage measures that are sensitive to duration.

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“…Cyclic deterioration of the structural component is implicitly considered via a lumped-plasticity model for a single bridge pier using the Ibarra et al (2005) model. It should be noted that prior to Chandramohan et al (2015), none of the earlier numerical studies accounted for the effect of cyclic deterioration in the nonlinear structural models (Sarieddine and Lin 2013, Cornell 1997, Hancock and Bommer 2007, Iervolino et al 2006, and Raghunandan and Liel 2013. However, the Ibarra et al (2005) model that is employed in the Chandramohan et al (2015) study, does not account for cross section geometry and axial force-bending moment interaction of RC sections and components.…”

Section: Introductionmentioning

confidence: 99%

“…A recent study conducted by Chandramohan et al (2015), proposes a methodology to quantify the effect of ground-motion duration on the probability of structural collapse. In order to isolate the effect of duration from other ground-motion characteristics, such as amplitude and frequency content, they used spectrally equivalent, long and short duration record sets, with unmodified spectral content.…”

Section: Introductionmentioning

confidence: 99%

Influence of non-stationary content of ground-motions on nonlinear dynamic response of RC bridge piers

Kashani

Mariotti

Yang

et al. 2017

Bull Earthquake Eng

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This paper quantifies the impact of the non-stationary content (time-varying parameters that are not captured by power spectral content alone) of different ground-motion types (near/far field, with/without pulses time-series) on the nonlinear dynamic response of reinforced concrete (RC) bridge piers, taking into account the material cyclic degradation. Three groups of ground motions are selected to represent far-field, near-field without pulse and near-field pulse-like ground motions. Three analysis cases are considered corresponding to acceleration series matched to the mean response spectrum of: (i) far field, (ii) near-field without pulse and (iii) near-field pulse-like groundmotions, respectively. Using the selected ground motions, several nonlinear incremental dynamic analyses (IDAs) of prototype reinforced concrete bridge piers with a range of fundamental periods are conducted. Finally, a comparison between the response of the structures using the material model accounting for both buckling and low-cycle fatigue of reinforcing steel and the more conventional material model that does not account for these effects is made. The results show that the inelastic buckling and low-cycle fatigue have a significant influence on the nonlinear response of the RC bridge piers considered and that pulse effects can increase the mean acceleration response by about 50%.

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Quantifying the Influence of Ground Motion Duration on Structural Collapse Capacity Using Spectrally Equivalent Records

Cited by 256 publications

References 38 publications

Ductility‐dependent intensity measure that accounts for ground‐motion spectral shape and duration

Ductility‐dependent intensity measure that accounts for ground‐motion spectral shape and duration

Influence of earthquake ground‐motion duration on damage estimation: application to steel moment resisting frames

Influence of non-stationary content of ground-motions on nonlinear dynamic response of RC bridge piers

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