Nonlinear dynamic response of a tall building to near-fault pulse-like ground motions

Güneş, Necmettin; Ulucan, Zülfü Çınar

doi:10.1007/s10518-019-00570-y

Cited by 58 publications

(21 citation statements)

References 33 publications

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“…This may reduce the efficacy of the seismic isolation technique in terms of base-shear response reduction and also cause significant superstructure displacement responses. Numerous studies in the past have illustrated that for the same PGA and duration of shaking, NF ground motions could impose higher seismic demands (e.g., base shear, and global displacement) on flexible structures, as compared to ordinary FF excitations (e.g., see Hall et al, 1995;Malhotra, 1999;Liao et al, 2000Liao et al, , 2004Shen et al, 2004;Li et al, 2007;Jäger and Adam, 2013;Beiraghi et al, 2016;Günes and Ulucan, 2019). Specific examples of isolated structures damaged due to NF effects are presented in Li et al (2008), Wang and Lee (2009), and Jónsson et al (2010).…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of Seismic Isolation for Long-Period Structures Subject to Far-Field and Near-Field Excitations

Anajafi

Poursadr²,

Roohi

et al. 2020

Front. Built Environ.

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This study evaluates primarily the effectiveness of seismic isolation for structures with intermediate and relatively long non-isolated periods (e.g., bridges with tall piers) subjected to near-field (NF) and far-field (FF) excitations. The inelastic response spectrum approach is used to systematically evaluate the effects of the two fundamental aspects of seismic isolation, i.e., period lengthening and lateral-strength reduction on the seismic responses (e.g., displacement, acceleration, and base shear) of isolated structures. To validate the results, the real-world isolated Rudshur bridge with a relatively flexible (long-period) substructure is studied. Additional isolated and non-isolated variants of the Rudshur bridge with different initial periods are also developed. 20 FF (non-pulse) and 20 NF (pulse type) ground motions are used for the non-linear response history analyses. The results illustrate that when designed properly, seismic isolation can effectively reduce the mean base shear and acceleration responses of structures with relatively long non-isolated periods under FF excitations. For these structures, seismic isolation does not significantly increase the mean displacement responses under FF excitations, and for particular cases, can even reduce them. For NF excitations, seismic isolation can significantly reduce the mean base shear responses of intermediate-to long-period structures. In some cases, this reduction is even more significant than that for FF excitations. However, when the initial period of the isolated structure is relatively long (e.g., greater than 2.5 s), NF excitations can impose significantly large mean displacement demands on the superstructure (i.e., as great as 1.0 m for the studied cases). For NF excitations, a range of initial period (e.g., 1.5-2.5 s for the studied ground motions) and lateral yield-strength (e.g., 10-15% of the seismically effective weight) exists for the isolation system parameters that can noticeably reduce mean acceleration and base shear responses while mean displacement responses of the isolated superstructure remain within ranges used in practice. The inelasticspectrum approach, as used in this paper, can reasonably predict these isolation system parameters.

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Section: Introductionmentioning

confidence: 99%

Effectiveness of Seismic Isolation for Long-Period Structures Subject to Far-Field and Near-Field Excitations

Anajafi

Poursadr²,

Roohi

et al. 2020

Front. Built Environ.

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“…2009 of the Ministry of Construction of Japan [34], the equivalent linearization technique can be used for target displacement evaluations of base-isolated buildings. However, several researchers have examined the responses of long-period building structures subjected to pulse-like ground motions, e.g., Mazza examined a base-isolated building [18,20] and Güneş and Ulucan studied a tall reinforced concrete building [35]. Because the effective damping is calculated based on a steady response having the same displacement amplitude in the positive and negative directions, the use of effective damping for the prediction of the peak responses of base-isolated structures subjected to pulselike ground motion is questionable.…”

Section: Motivationmentioning

confidence: 99%

Application of Mode-Adaptive Bidirectional Pushover Analysis to an Irregular Reinforced Concrete Building Retrofitted via Base Isolation

Fujii¹,

Masuda²

2021

Preprint

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In this article, the main building of the former Uto City Hall, which was severely damaged in the 2016 Kumamoto earthquake, is investigated as a case study for the retrofitting of an irregular Reinforced Concrete building using the base-isolation technique. Its peak response is predicted via mode-adaptive bidirectional pushover analysis (MABPA), which was originally proposed by the authors. In the prediction step of MABPA, the peaks of the first and second modal responses are predicted considering the energy balance during a half cycle of the structural response. The numerical analysis results show that the peak relative displacement can be properly predicted by MABPA. The results also show that the performance of the retrofitted building models is satisfactory for the ground motion considered in this study, including the recorded motions in the 2016 Kumamoto earthquake.

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“…From these studies, it is found that the displacement ductility level, the structural period, and the hysteretic model have a significant effect on the strength reduction factor. In recent years, the study on the continuous accumulation of the strong earthquake data and the increased understanding of the earthquake mechanism indicated that the near-fault pulse-like ground motions may cause severe structural damage (Alavi and Krawinkler, 2004; Chopra and Chintanapakdee, 2001; Güneş and Ulucan, 2019; Hatzigeorgiou, 2010a). Some research works have been carried out to investigate the strength reduction factor for near-fault pulse-like ground motions (Ahmadi and Khoshnoudian, 2015; Gillie et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Strength reduction factor of self-centering structures under near-fault pulse-like ground motions

Dong

Han

et al. 2020

Advances in Structural Engineering

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Many studies on the strength reduction factor mainly focused on structures with the conventional hysteretic models. However, for the self-centering structure with the typical flag-shaped hysteretic behavior, the corresponding study is limited. The main purpose of this study is to investigate the strength reduction factor of the self-centering structure with flag-shaped hysteretic behavior subjected to near-fault pulse-like ground motions by the time history analysis. For this purpose, the smooth flag-shaped model based on Bouc-Wen model which can show flag-shaped hysteretic behavior is first described. The strength reduction factor spectra of the flag-shaped model are then calculated under 85 near-fault pulse-like ground motions. The influences of the ductility level, vibration period, site condition, hysteretic parameter, and hysteretic model are investigated statistically. For comparison, the strength reduction factors under ordinary ground motions are also analyzed. The results show that the strength reduction factor from near-fault pulse-like ground motions is smaller. Finally, a predictive model is proposed to estimate the strength reduction factor for the self-centering structure with the flag-shaped model under near-fault pulse-like ground motions.

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Nonlinear dynamic response of a tall building to near-fault pulse-like ground motions

Cited by 58 publications

References 33 publications

Effectiveness of Seismic Isolation for Long-Period Structures Subject to Far-Field and Near-Field Excitations

Effectiveness of Seismic Isolation for Long-Period Structures Subject to Far-Field and Near-Field Excitations

Application of Mode-Adaptive Bidirectional Pushover Analysis to an Irregular Reinforced Concrete Building Retrofitted via Base Isolation

Strength reduction factor of self-centering structures under near-fault pulse-like ground motions

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