Evaluation of Damaging Properties of Ground Motions and Estimation of Maximum Displacement Based on Momentary Input Energy

Nakamura, Takaya; Hori, Norio; Inoue, Norio

doi:10.3130/aijs.63.65_2

Cited by 17 publications

(22 citation statements)

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“…As indices for intensity of input energy, several values are used such as energy input rate (EIR) [8], and momentary input energy that is increase of energy during unit time. And then, damaging properties of ground motions are studied based on momentary energy response [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Damaging properties of ground motions and prediction of maximum response of structures based on momentary energy response

Hori¹,

Inoue²

2002

Earthq Engng Struct Dyn

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SUMMARYDynamic damaging potential of ground motions must be evaluated by the response behaviour of structures, and it is necessary to indicate what properties of ground motions are most appropriate for evaluation. For that purpose, the behaviour of energy input process and hysteretic energy dissipation are investigated in this study. It is found that the momentary input energy that is an index for the intensity of input energy is related to the characteristics of earthquakes such as cyclic or impulsive, and to the response displacement of structures immediately.On the basis of these results, a procedure is proposed to predict inelastic response displacement of structures by corresponding earthquake input energy to structural dissipated damping and hysteretic energy. In this procedure the earthquake response of structures is recognized as an input and dissipation process of energy, and therefore structural properties and damaging properties of ground motions can be taken into account more generally.Lastly, the studies of the pseudodynamic loading test of reinforced concrete structure specimens subjected to ground motions with di erent time duration are shown. The purpose of this test is to estimate the damaging properties of ground motions and the accuracy of proposed prediction procedure.

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Section: Introductionmentioning

confidence: 99%

Damaging properties of ground motions and prediction of maximum response of structures based on momentary energy response

Hori¹,

Inoue²

2002

Earthq Engng Struct Dyn

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“…In Equation ( 17), t and t t  are respectively the beginning and ending times of a half cycle, following the definition of Inoue and his group [59][60][61]. The maximum momentary input energy of the first modal response per unit mass ( * * 1 max 1…”

Section: 11mentioning

confidence: 99%

“… The third point is that the simplified modeling of the hysteretic dissipated energy during a half cycle of the structural response for a given peak equivalent displacement discussed in Section 4 is essential to the prediction of the peak response of RC MRFs with steel damper columns. Using the maximum momentary input energy spectrum introduced by Inoue and his coauthors [59][60][61], the peak equivalent displacement of the first modal response can be predicted. Note that the cyclic degradation of members in RC MRFs is relatively mild.…”

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confidence: 99%

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

Fujii¹

2022

Preprint

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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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“…In Akiyama's theory, the total input energy is considered to be a suitable seismic intensity parameter to access the cumulative response of a structure. Instead of the total input energy, Inoue et al proposed the maximum momentary input energy [37][38][39] as an intensity parameter related to the peak displacement; the nonlinear peak displacement can be predicted by equating the maximum momentary input energy and the cumulative hysteresis energy during a half cycle of the structural response. Following the work of Inoue et al, the authors investigated the relationship between the maximum momentary input energy and the total input energy of an elastic single-degree-of-freedom (SDOF) model [40].…”

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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Evaluation of Damaging Properties of Ground Motions and Estimation of Maximum Displacement Based on Momentary Input Energy

Cited by 17 publications

References 0 publications

Damaging properties of ground motions and prediction of maximum response of structures based on momentary energy response

Damaging properties of ground motions and prediction of maximum response of structures based on momentary energy response

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

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

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