Seismic Evaluation and Retrofit of Concrete Buildings: A Practical Overview of the <i>ATC 40</i> Document

Comartin, Craig D.; Niewiarowski, Richard W.; Freeman, Sigmund A.; Turner, Fred

doi:10.1193/1.1586093

Cited by 76 publications

(32 citation statements)

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“…We consider two-and four-story buildings as representative of the two categories, respectively. In the engineering practice, the effective fundamental vibration period of a SDOF, equivalent to a four-story reinforced concrete building, and the modal participation factor can be estimated as 1.0 and 1.4 sec, respectively (Comartin and Niewiarowski, 1996;FEMA-356, 2000). If we consider the displacement response spectrum of the east-west components of the CATA station for event 4, the spectral displacement at 1 sec is about 1 cm, while the peak ground displacement (PGD) for the same component is 1.8 cm (Fig.…”

Section: Discussionmentioning

confidence: 99%

The Role of Long-Period Ground Motions on Magnitude and Damage of Volcanic Earthquakes on Mt. Etna, Italy

Milana¹,

Rovelli²,

Sortis³

et al. 2008

Bulletin of the Seismological Society of America

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On October 2002, a seismic swarm occurred on Mt. Etna. One of the strongest events caused severe damage, up to a European Macroseismic Scale intensity of VIII that contrasts with its local magnitude of 4.4. The occurrence of significant damage at such a small magnitude is repeatedly observed in the area and is traditionally attributed to shallow source. Recorded strong-motion accelerograms and broadband seismograms demonstrate that there is one more cause for the severe damage, that is, an anomalously strong low-frequency (0:1 < f < 1 Hz) radiation deviating from the conventional Brune (1970) spectral scaling. Therefore, these earthquakes cause large ground displacements and long (≈20 sec) durations of shaking. The integration of digital accelerograms yields a maximum peak ground displacement as large as 1.8 cm at a distance of 18 km. Based on the sharp local attenuation of ground motion in the study area, we infer that peak ground displacements near the epicenters did exceed 10 cm. The occurrence of large displacements caused selective damage to medium-rise (≥ 3 stories) reinforced concrete buildings and elements like church façades.The frequency cutoff below 1.25 Hz in the Wood-Anderson response attenuates the peak-to-peak amplitudes used to assess local magnitudes. Therefore, M L values are not representative of the real strength of volcanic earthquakes. Because a prompt magnitude (and damage potential) assessment is crucial for civil protection actions, a procedure is proposed which, in near-real time, can be successful in identifying potentially damaging earthquakes of Mt. Etna through the computation of pseudovelocity response spectra. The procedure provides a magnitude value that is derived on a statistical basis from the Housner (1952) spectral intensity computed in the low-frequency band. This parameter is a suitable near-real-time indicator of large earthquake-induced building shaking and could also be applied for a preliminary estimate of the epicentral macroseismic intensity.

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Section: Discussionmentioning

confidence: 99%

The Role of Long-Period Ground Motions on Magnitude and Damage of Volcanic Earthquakes on Mt. Etna, Italy

Milana¹,

Rovelli²,

Sortis³

et al. 2008

Bulletin of the Seismological Society of America

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“…The nonlinearity of the beam and column members was modeled by considering plastic hinges at both ends of the elements. The plastic hinges of the uniaxial bending moments for the beams and the axial loads and uniaxial bending moments were assigned to the columns in accordance with ATC-40 (FEMA, 1997) and FEMA-273 (Comartin, Niewiarowski, Freeman, & Turner, 2000) documents. Damping was considered in the case of the mass and proportional stiffness damping with 5 % damping in the first and second modes.…”

Section: Methodology Of the Nonlinear Time History Analysismentioning

confidence: 99%

Effect of a Near Fault on the Seismic Response of a Base-Isolated Structure with a Soft Storey

Athamnia

Ounis

Abdeddaim

2017

Slovak Journal of Civil Engineering

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“…1) is based on HAZUS methodology (The FEMA Tool Estimating Earthquake Losses) [7], which relies on the capacity spectrum method developed from several scientific researches, [8][9][10][11][12]. The main parameters are the seismic solicitation represented by a response spectrum and the structure behaviour represented by its capacity curve.…”

Section: Earthquake Damage Assessment Methodology For Algerian Buildingsmentioning

confidence: 99%

Earthquake damage assessment: a theoretical framework and its application to Algerian buildings

Boukri

Farsi²,

Mébarki

et al. 2014

Risk Analysis IX

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Algeria is one of the countries that have experienced several moderate to strong earthquakes during the last three decades causing considerable damage in the urban areas. This damage can be reduced if we proceed to estimate the seismic risk in sufficient time in order to take adequate preventive measures. In this paper, an earthquake damage assessment methodology, adapted from HAZUS approach (Hazard-United States) to the Algerian building context, which relies on the capacity spectrum method, is presented. It aims to estimate the damages and potential losses that may be generated by a given earthquake in a prone area. This methodology was calibrated and validated using the data of observed damages for ~3,700 buildings in Boumerdès city in the aftermath of the May 21st 2003 earthquake (Mw = 6.8). On the other hand, this methodology constitutes a decision-making tool for the concerned governmental organizations in charge to give the seismic warning with a level relative to the damage level, which can be estimated automatically by the data-processing code developed for this purpose, once the epicentre is localised and the magnitude known.

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Seismic Evaluation and Retrofit of Concrete Buildings: A Practical Overview of the ATC 40 Document

Cited by 76 publications

References 0 publications

The Role of Long-Period Ground Motions on Magnitude and Damage of Volcanic Earthquakes on Mt. Etna, Italy

The Role of Long-Period Ground Motions on Magnitude and Damage of Volcanic Earthquakes on Mt. Etna, Italy

Effect of a Near Fault on the Seismic Response of a Base-Isolated Structure with a Soft Storey

Earthquake damage assessment: a theoretical framework and its application to Algerian buildings

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