Ground Motion Duration Effects on Hysteretic Behavior of Reinforced Concrete Bridge Columns

Ou, Yu‐Chen; Song, Jianwei; Wang, Ping‐Hsiung; Adidharma, Leo; Chang, Kuo‐Chun; Lee, George C.

doi:10.1061/(asce)st.1943-541x.0000856

Cited by 58 publications

(37 citation statements)

References 12 publications

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“…This increase in the number of inelastic cycles generated vertical cracks at an early stage of the test that culminated in lap splice failure. This result has direct implications in the design of retrofit measures for existing RC bridge columns since one would expect less capacity for columns subjected to subduction zone earthquakes and is consistent with the numerical case study and with previous experimental studies ( Takemura and Kawashima 1997) , (Kunnath et al 1997), (Ou et al 2013). Moreover, the result implies that the common assessment of existing bridges by doing pushover analyses might overestimate the actual strength and deformation capacity of RC bridge superstructures.…”

Section: Comparison Between Column Resultssupporting

confidence: 77%

“…This result is consistent with experimental and numerical studies, e.g. Ibarra and Krawinkler (Ibarra and Krawinkler 2005b), Borg et al (Borg et al 2012), Ou et al (Ou et al 2013), Chandramohan, et al (Chandramohan et al 2013). In those studies were concluded that structural components' capacity and collapse are influenced by the duration of ground motion and the number of inelastic cycles.…”

Section: Numerical Case Studysupporting

confidence: 81%

“…A similar study was recently performed at MCEER, University at Buffalo in conjunction with the National Taiwan University of Science and Technology (Ou et al 2013). In this case, reinforced concrete bridge columns were tested applying two different loading protocols to investigate the influence of the number of cycles on bridge columns.…”

Section: Implications From Past Researchmentioning

confidence: 99%

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Bridge Seismic Retrofit Measures Considering Subduction Zone Earthquakes

Dusicka¹,

Bazaez²,

Knoles³

2015

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Research was conducted to investigate the effect of subduction zone earthquakes on structural damage. The study suggests that large magnitude ground motions of long duration have the potential of significantly increasing the number of inelastic excursions and consequently incur more extensive structural damage as compared to ground motions with similar elastic spectral demands but of shorter duration. This increase in demand plays a crucial role in the Pacific Northwest where a mega subduction zone earthquake is impending. Typical reinforced concrete bridge bents constructed in the 1950 to mid-1970 in the State of Oregon were designed and built with minimum seismic considerations. This resulted in inadequate detailing within plastic hinge zones, leaving numerous RC bents highly susceptible to damage following an earthquake. In this study, the cyclic performance of an asbuilt RC square column and a reinforced concrete bridge bent retrofitted using buckling restrained braces (BRBs) was experimentally evaluated using quasi-static cyclic loading protocols aiming to reflect subduction zone earthquake demands up to displacement ductility. The buckling restrained braces were designed as replaceable elements in order to take the earthquake-induced energy and dissipate it through nonlinear hysteretic behavior. Two BRB designs were considered in the study in an effort to assess the influence of BRB stiffness on the overall structural performance. The results of these large-scale experiments successfully demonstrated the effectiveness of utilizing buckling restrained braces for achieving high displacement ductility of the retrofitted structure, while also controlling the damage of the existing vulnerable reinforced concrete bent up to the design performance levels. The potential of improving the overall seismic behavior and the design performance levels with BRBs offers structural design professionals a viable method for performance driven retrofit of reinforced concrete bents. 17. Key Words Subduction zone earthquakes, reinforced concrete bridge bents, plastic hinge zone, performance levels, bridge seismic retrofit, quasi-static loading protocol, buckling restrained braces.18. Distribution Statement: Copies available from NTIS, and online at

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Section: Comparison Between Column Resultssupporting

confidence: 77%

Section: Numerical Case Studysupporting

confidence: 81%

Section: Implications From Past Researchmentioning

confidence: 99%

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Bridge Seismic Retrofit Measures Considering Subduction Zone Earthquakes

Dusicka¹,

Bazaez²,

Knoles³

2015

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“…In this study, the scarcity of available ground motions has been addressed by collecting and utilizing long duration ground motions recorded from recent large magnitude earthquakes, most notably the 2008 Wenchuan (China), 2010 Maule (Chile), and 2011 Tohoku (Japan) earthquakes. The second challenge of isolating the effect of duration from other ground motion characteristics has been previously addressed by Hancock and Bommer (2007), Montejo and Kowalsky (2008), and Ou et al (2014) by modifying the spectral content of recorded accelerograms to have similar response spectra. Sideras and Kramer (2012) used stochastically simulated accelerograms having similar amplitude and frequency characteristics, but different durations.…”

Section: Introductionmentioning

confidence: 99%

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

2016

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This study examines the influence of ground motion duration on the collapse capacities of a modern, five-story steel moment frame and a reinforced concrete bridge pier. The effect of duration is isolated from the effects of ground motion amplitude and response spectral shape by assembling sets of "spectrally equivalent", long and short duration records, and employing them in comparative non-linear dynamic analyses. For the modern steel moment frame, the estimated median collapse capacity is 29% lower when using the long duration set, as compared to the short duration set. For the concrete bridge pier, the collapse capacity is 17% lower. A comparison of commonly used duration metrics indicates that significant duration is the most suitable metric to characterize ground motion duration for structural analysis. Sensitivity analyses to structural model parameters indicate that structures with high deformation capacities and rapid rates of cyclic deterioration are the most sensitive to duration.

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“…Foliente [14] extended the singleelement pinching model to allow the point of maximum pinching at any hysteretic restoring force level. Based on the test results of RC bridge columns, Ou et al [13] proposed to relate the pinching effect to the maximum displacement. Based on the test results of RC bridge columns, Ou et al [13] proposed to relate the pinching effect to the maximum displacement.…”

Section: Introductionmentioning

confidence: 99%

A new smooth hysteretic model for ductile flexural‐dominated reinforced concrete bridge columns

Wang

Chang

2017

Earthq Engng Struct Dyn

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Summary A new smooth hysteretic model is proposed for ductile, flexural‐dominated reinforced concrete bridge columns. Four columns designed per modern seismic codes were tested using monotonically increasing and variable‐amplitude cyclic loading protocols and ground motion loading to develop the model. Based on the test results, hysteretic rules for damage accumulation and path dependence of reloading were constructed. For damage accumulation, unloading stiffness degradation is correlated with the maximum displacement and hysteretic energy dissipation, while reloading stiffness degradation is set equal to the unloading stiffness degradation. Pinching severity is related to the residual displacement in the direction opposite to the loading direction. Strength deterioration is correlated with the damage index and does not occur until the damage index reaches a threshold, after which the deterioration is proportional to the increase of the damage index. For path dependence of reloading, reloading paths are classified into primary paths and associate paths. The primary paths are those that start from a residual displacement that is equal to or larger than the previous maximum one. The associate paths are those that do not belong to primary paths and tend to be directed towards certain points. Reloading without load reversal is assumed to be linear. Comparison with the results of pseudo‐dynamic tests using three consecutive ground motions showed that the proposed model closely matched the test results. Copyright © 2017 John Wiley & Sons, Ltd.

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Ground Motion Duration Effects on Hysteretic Behavior of Reinforced Concrete Bridge Columns

Cited by 58 publications

References 12 publications

Bridge Seismic Retrofit Measures Considering Subduction Zone Earthquakes

Bridge Seismic Retrofit Measures Considering Subduction Zone Earthquakes

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

A new smooth hysteretic model for ductile flexural‐dominated reinforced concrete bridge columns

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