Fragility Curves for RC Frames Subjected to Tohoku Mainshock-Aftershocks Sequences

Abdelnaby, Adel E.

doi:10.1080/13632469.2016.1264328

“…because the energy-based damage index of tall RC buildings increases due to the seismic sequences. In addition to these studies, Zhai et al [30][31][32][33], Di Sarmo et al [33][34][35][36], Abdelnaby et al [37][38][39][40][41], Kagermanov and Gee [42,43], Yang et al [44,45], Yaghmaei-Sabegh et al [46], Qiao et al [47], Orlacchio et al [48], Hoveidae and Radpour [49], and Pirooz et al [50] investigated the nonlinear response of building structures under seismic sequences. Although most of those studies were analytical in nature, one experimental study used a shaking table [47].…”

Section: Studies On the Responses Of Structures Under Seismic Sequencesmentioning

confidence: 99%

Peak and Cumulative Response of Reinforced Concrete Frames with Steel Damper Columns under Seismic Sequences

Fujii¹

2022

Preprint

0

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The steel damper column is an energy-dissipating member that is suitable for reinforced concrete (RC) buildings, and those used for multistory housing in particular. However, the effectiveness of steel damper columns may be affected by the behavior of surrounding members, and this effect can be severe in the case of seismic sequences. This article investigates the nonlinear response of building models having an RC moment-resisting frame (MRF) with and without steel damper columns under seismic sequences. The applicability of the concept of the momentary energy input to the prediction of the peak response of RC MRFs with damper columns under seismic sequences is also investigated. The main findings of the study are summarized as follows. (1) The peak response of RC MRFs with damper columns subjected to sequential accelerations is similar to the peak response obtained considering only the mainshock, whereas the cumulative strain energy of RC MRFs accumulates more for sequential accelerations. (2) The steel damper column is effective in reducing the peak and cumulative responses of RC MRFs in the case of sequential seismic input. (3) The relation of the hysteretic dissipated energy during a half cycle of the structural response and the peak displacement of the first modal response can be properly evaluated using the simple model proposed in this study.

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“…Similarly, they had concluded that the influence of major aftershocks on the damage potential is significant because the energy-based damage index of tall RC buildings increases due to the seismic sequences. In addition to these studies, Zhai et al [30][31][32][33], Di Sarno et al [33][34][35][36], Abdelnaby et al [37][38][39][40][41], Kagermanov and Gee [42,43], Yang et al [44,45], Yaghmaei-Sabegh et al [46], Qiao et al [47], Orlacchio et al [48], Hoveidae and Radpour [49], and Pirooz et al [50] investigated the nonlinear response of building structures under seismic sequences. Although most of those studies were analytical in nature, one experimental study used a shaking table [47].…”

Section: Studies On the Responses Of Structures Under Seismic Sequencesmentioning

confidence: 99%

Peak and Cumulative Response of Reinforced Concrete Frames with Steel Damper Columns under Seismic Sequences

Fujii¹

2022

Preprint

2

0

View full text Add to dashboard Cite

The steel damper column is an energy-dissipating member that is suitable for reinforced concrete (RC) buildings, and those used for multistory housing in particular. However, the effectiveness of steel damper columns may be affected by the behavior of surrounding members, and this effect can be severe in the case of seismic sequences. This article investigates the nonlinear response of building models having an RC moment-resisting frame (MRF) with and without steel damper columns under seismic sequences. The applicability of the concept of the momentary energy input to the prediction of the peak response of RC MRFs with damper columns under seismic sequences is also investigated. The main findings of the study are summarized as follows. (1) The peak response of RC MRFs with damper columns subjected to sequential accelerations is similar to the peak response obtained considering only the mainshock, whereas the cumulative strain energy of RC MRFs accumulates more for sequential accelerations. (2) The steel damper column is effective in reducing the peak and cumulative responses of RC MRFs in the case of sequential seismic input. (3) The relation of the hysteretic dissipated energy during a half cycle of the structural response and the peak displacement of the first modal response can be properly evaluated using the simple model proposed in this study.

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“…This is due to the damage induced to structures by preceding mainshocks. This damage leads to degradation in structural parameters of the frame system, especially in stiffness and strength (Abdelnaby, 2018).…”

Section: Introductionmentioning

confidence: 99%

Generation of critical aftershocks using stochastic neural networks and wavelet packet transform

Rajabi

¹

,

Amiri

²

2019

Journal of Vibration and Control

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This paper proposes a methodology using wavelet packet transform, principal component analysis, and neural networks in order to generate artificial critical aftershock accelerograms which are compatible with the response spectra. This procedure uses the learning abilities of neural networks, principal component analysis as a dimension reduction technique, and decomposing capabilities of wavelet packet transform on consecutive earthquakes. In fact, the proposed methodology consists of two steps and expands the knowledge of the inverse mapping from mainshock response spectrum to aftershock response spectrum and aftershock response spectrum to wavelet packet transform coefficients of the aftershocks. This procedure results in a stochastic ensemble of response spectra of aftershock (first step) and corresponding wavelet packet transform coefficients (second step) which are then used to generate the aftershocks through applying the inverse wavelet packet transform. Finally, in order to demonstrate the effectiveness of the proposed method, three examples are presented in which recorded critical successive ground motions are used to train and test the neural networks.

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Fragility Curves for RC Frames Subjected to Tohoku Mainshock-Aftershocks Sequences

Cited by 55 publications

References 26 publications

Peak and Cumulative Response of Reinforced Concrete Frames with Steel Damper Columns under Seismic Sequences

Peak and Cumulative Response of Reinforced Concrete Frames with Steel Damper Columns under Seismic Sequences

Peak and Cumulative Response of Reinforced Concrete Frames with Steel Damper Columns under Seismic Sequences

Generation of critical aftershocks using stochastic neural networks and wavelet packet transform

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