Strength Decay in R/C Beams under Load Reversals

Scribner, Charles; Wight, James K.

doi:10.1061/jsdeag.0005402

Cited by 27 publications

(5 citation statements)

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“…Quinde et al, 2021; Terán Gilmore, 2001) and quasi-static, cyclic experimental tests on individual structural components (e.g. Erberik and Sucuoǧlu, 2004; Scribner and Wight, 1980). A wide distribution of D s 5 − 95 is used to build such a median relationship (Figure 5b), avoiding bias in the estimations due to an improper consideration of the structural response variability due to ground-motion duration.…”

Section: Methodsmentioning

confidence: 99%

Impact of ground-motion duration on nonlinear structural performance: Part I: spectrally equivalent records and inelastic single-degree-of-freedom systems

Otárola

Gentile

Sousa³

et al. 2023

Earthquake Spectra

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In current seismic performance-based assessment approaches, nonlinear dynamic analysis of structures generally relies on ground motions selected based on their pseudo-spectral accelerations, with little or no consideration for ground-motion duration. Part I of this study, presented in this article, attempts to comprehensively quantify the impact of ground-motion duration on the nonlinear structural performance of case-study inelastic single-degree-of-freedom systems for shallow-crustal seismicity conditions. The effect of duration is decoupled from that of ground-motion amplitude and spectral shape by assembling sets of spectrally equivalent long- and short-duration records. Such sets are employed in incremental dynamic analyses of a wide range of computational models incorporating in-cycle and cyclic strength and stiffness deterioration. The structural response is quantified in terms of peak- and cumulative-based engineering demand parameters. Formal hypothesis testing is used to assess the statistical significance of duration’s impact on the median structural capacity of the considered structural systems. Furthermore, the derivation of duration-dependent fragility and vulnerability relationships demonstrates that ground-motion duration effectively impacts the nonlinear structural performance of various systems, and it should be accounted for in current practice. The fragility median values for highly deteriorating structural systems under long-duration ground motions are found to be up to 21% or 34.0% smaller than the short-duration counterpart if a peak- or cumulative-based engineering demand parameter is adopted, respectively.

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Section: Methodsmentioning

confidence: 99%

Impact of ground-motion duration on nonlinear structural performance: Part I: spectrally equivalent records and inelastic single-degree-of-freedom systems

Otárola

Gentile

Sousa³

et al. 2023

Earthquake Spectra

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“…Numerous experimental load-displacement curves for reinforced concrete (R/C) members subjected to cyclic reversal loading are readily available in various sources, including but not limited to [1]; [2]; [3]; [4]; [5]; [6]; [7]; [8]; [9] and [10]. To determine the parameters δ, the number of yield excursions in the experimental load-displacement history is divided by the total strength drop.…”

Section: Prediction Of Experimental Load Displacement Curvesmentioning

confidence: 99%

“…In this backdrop, this study is to gather and apprehend the existing hysteresis models which can capture progressive seismic damage to give an overall behaviour of the structure during seismic excitation. Out of several previously developed hysteresis model, some significant hysteresis models are available in the literature and are not limited to PEER Structural Performance Database, [1]; [2]; [3]; [4]; [5]; [6]; [7]; [8]; [9]; [10], etc. Based on the literature survey conducted in this chapter, hysteresis modelling has been categorized in 1) Simplified Hysteresis modelling and 2) Complex hysteresis modelling.…”

Section: Introductionmentioning

confidence: 99%

Inelastic Seismic Response of R/C Structural Systems in terms of Hysteresis Modelling in Overall Sense: State of the Art

Hazra,

Das

2023

Recent Experimental and Computational Research in Structural Engineering

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Seismic performance of reinforced concrete(R/C) membered structure during earthquakes has been differed significantly from their intended behavior due to progressive loss of strength and stiffness. In this context, from the macro scale point of view, the present study aims to provide an overview of hysteresis model development to assess progressive seismic damage of an entire structural system. Considering the requirement of number of input parameters and complexity to solve the corresponding equations, this study presents a state of the art review of different modelling philosophies by grouping them in i) simpler hysteresis model and ii) complex hysteresis model. It is found out that in comparison with complex hysteresis models, which require case-specific detailed calibration study, simpler hysteresis model on the other hand can predict the behavior of R/C structural elements with progressively degraded strength and stiffness in approximate yet realistic manner, which is more acceptable to predict the overall behavior of structures. Recognizing the same, simpler hysteresis models are emphasized in this study. Significant number of hysteresis models have been analyzed to highlight previous drawbacks, subsequently a simpler enhanced hysteresis model has also been proposed with greater accuracy taking care of non-specificness, computational efficiency and mathematical tractability.

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“…48, 49) and quasi‐static, cyclic experimental tests on individual structural components (e.g., in refs. 50, 51). A wide distribution of

D{s}_{5 - 95}

is used to build such relationship, avoiding bias in the estimations due to an improper consideration of the structural response variability due to ground‐motion duration.…”

Section: Simulation‐based Seismic Loss Assessmentmentioning

confidence: 99%

Accounting for earthquake‐induced ground‐motion duration in building‐portfolio loss assessment

Otárola

Gentile

Sousa³

et al. 2022

Earthq Engng Struct Dyn

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Earthquake-induced ground-motion duration can have a non-negligible impact on the nonlinear seismic performance of structures. However, in current seismic risk assessment practice, hazard and vulnerability analyses generally only consider ground motion's amplitude and frequency-content features, often relegating duration to implicit considerations. This study introduces a simulation-based framework to explicitly quantify the impact of ground-motion duration on building-portfolio direct economic losses. Case-study synthetic building portfolios located at different distances from a case-study seismic source (i.e., fault) are assembled considering -individually and in combinationthree building typologies representing distinct vulnerability classes in Southern Italy. Such typologies correspond to non-ductile moment-resisting reinforced concrete (RC) infilled frames designed to only sustain gravity loads (i.e., precode infilled frames), and ductile moment-resisting RC infilled and bare frames designed considering seismic provisions for high-ductility capacity (i.e., specialcode infilled and bare frames). Event-based probabilistic seismic hazard analysis is performed explicitly simulating duration jointly with spectral-shape-related intensity measures (IMs), accounting for their spatial and cross-correlation.Sets of ground-motion records are selected to conduct cloud-based nonlinear time-history analyses (NLTHAs) and derive fragility models for each considered building typology through archetype structures, simulating their structural response using computational models that account for stiffness and strength cyclic and in-cycle deterioration as well as destabilising 𝑃 − Δ effects. Fragility models are derived using average pseudo-spectral acceleration (in a range of periods of interest) as the primary IM and alternatively: (1) the dissipated hysteretic energy as an engineering demand parameter (EDP), implicitly accounting for duration given the cumulative nature of such an EDP and the adopted nonlinear modelling strategy, in a scalar format; (2) the dissipated hysteretic energy as an EDP, as before, explicitly considering duration as an IM together with spectral shape, in a vector-valued format. Vulnerability models are then derived usingThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Strength Decay in R/C Beams under Load Reversals

Cited by 27 publications

References 0 publications

Impact of ground-motion duration on nonlinear structural performance: Part I: spectrally equivalent records and inelastic single-degree-of-freedom systems

Impact of ground-motion duration on nonlinear structural performance: Part I: spectrally equivalent records and inelastic single-degree-of-freedom systems

Inelastic Seismic Response of R/C Structural Systems in terms of Hysteresis Modelling in Overall Sense: State of the Art

Accounting for earthquake‐induced ground‐motion duration in building‐portfolio loss assessment

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