Energy Input and Damages in Structures Subjected to Severe Earthquakes

Kato, Ben; Akiyama, Hiroshi

doi:10.3130/aijsaxx.235.0_9

Cited by 45 publications

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“…A more rational seismic design approach, which also overcomes this difficulty, is to express the dynamic input effect through energy response spectra. Interpreting the effect of earthquakes in terms of energy is gaining extensive attention [Housner, 1956;Berg, Tomaides, 1960;Kato, Akiyama, 1975;Housner, Jennings, 1977;Hall et al, 1984;Akiyama, 1985;Uang, Bertero, 1988 and1990;Kuwamura et al, 1994;Bruneau, Wang, 1996;Bertero et al, 1996;Yei, Otani, 1999;Chou et al, 2000;Chou, Uang, 2003;Adang 2007;Leelataviwat et al 2009;Jiao et al, 2011]. This approach features three major advantages: (i) the input effect in terms of energy and the structural resistance in terms of energy dissipation capacity are basically uncoupled, (ii) except in the short period range, the input energy, E I , introduced by a given ground motion in a structure is a stable quantity, governed primarily by the natural period T and the mass m, and scarcely by other structural properties such as resistance, damping and hysteretic behavior, and (iii) the consideration of the cumulative damage fits well with this formulation and can be directly addressed.…”

Section: Introductionmentioning

confidence: 99%

Design energy input spectra for high seismicity regions based on Turkish registers

Almansa

Yazgan

Benavent‐Climent

2013

Bull Earthquake Eng

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SUMMARY:This work proposes design energy spectra in terms of an equivalent velocity, intended for regions with design peak acceleration 0.3 g or higher. These spectra were derived through linear and nonlinear dynamic analyses on a number of selected Turkish strong ground motion records. In the long and mid period ranges the analyses are linear, given the relative insensitivity of the spectra to structural parameters other than the fundamental period; conversely, in the short period range, the spectra are more sensitive to the structural parameters and, hence, nonlinear analyses are required. The selected records are classified in eight groups with respect to soil type (stiff or soft soil), the severity of the earthquake in terms of surface magnitude M s (M s  5.5 and M s > 5.5) and the relevance of the near-source effects (impulsive or vibratory). For each of these groups, median and characteristic spectra are proposed; such levels would respectively correspond to 50% and 95% percentiles. These spectra have an initial linear growing branch in the short period range, a horizontal branch in the mid period range and a descending branch in the long period range. Empirical criteria for estimating the hysteretic energy from the input energy are suggested. The proposed design spectra are compared with those obtained from other studies.

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Section: Introductionmentioning

confidence: 99%

Design energy input spectra for high seismicity regions based on Turkish registers

Almansa

Yazgan

Benavent‐Climent

2013

Bull Earthquake Eng

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“…The shock was with high acceleration, long duration and be accompanied by many aftershocks. There were aftershocks with maximum acceleration over 300 cm/s 2 . Two stage of the earthquake intensity expected in the present seismic design code are shown in Table 1.…”

Section: Introductionmentioning

confidence: 99%

Examination About the Influence of Aftershocks to Buildings

Takenoya¹,

Ishinabe

Hannuki

et al. 2014

Journal of JAEE

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Many aftershocks were observed in the Pacific coast of Tohoku Earthquake. In view of this fact, aftershocks should be paid attention, although it is ignored in conventional design. In this paper, the effect of aftershocks to buildings is discussed focusing on energy input. From cumulative energy spectrum, it is elucidated that aftershocks recorded this time have enough energy to bring certain level of damage. P-delta effect degrades the strength of the buildings. Therefore, buildings damaged after main shock can be brought significant incremental deformation by small energy of aftershocks.

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“…As was discussed in Nagao and Kanda (2013), in low frequency bands such as 0.1 -1.0 Hz, the DCF R approaches unity as σ decreases, while the opposite tendency can be observed in higher frequency bands. On the other hands, as for σ-DCF E relations, damping effect may be insignificant in any frequency ranges, as was discussed in Kato and Akiyama (1975). Linear regression model was chosen to represent each of the relationships.…”

Section: Damping Effects On Response Spectrum and Energy Spectrummentioning

confidence: 99%

“…He verified the assumption using a few structural damage examples (Housner 1959). Kato and Akiyama (1975) showed that the total amount of energy (E) to structures depends mainly on the natural period T n and total mass m, not on the damping ratio and restoring force characteristics.…”

Section: Introductionmentioning

confidence: 99%

Spectrum Conversion Factor and its Application for Ground Motion Simulation

Nagao¹,

Kanda

2014

Journal of JAEE

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ABSTRACT:Concept of the Spectrum Conversion Factor (SCF), the ratio of the equivalent velocity (total energy input to structures) and spectral velocity (peak response velocity), is introduced and relationships between the standard deviation of phase difference (σ) and SCF are investigated. With damping, σ-SCF relations always have a positive slope, and the slopes are steeper in higher frequency band or higher damping ratio cases. In the final part of this study, three artificial ground motions compatible to design response spectra and the expected design energy spectra were demonstrated.

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Energy Input and Damages in Structures Subjected to Severe Earthquakes

Cited by 45 publications

References 0 publications

Design energy input spectra for high seismicity regions based on Turkish registers

Design energy input spectra for high seismicity regions based on Turkish registers

Examination About the Influence of Aftershocks to Buildings

Spectrum Conversion Factor and its Application for Ground Motion Simulation

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