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Article

Case Study of a Heavily Damaged Building during the 2016 MW 7.8 Ecuador Earthquake: Directionality Effects in Seismic Actions and Damage Assessment

Department of Civil and Environmental Engineering, Universitat Politècnica de Catalunya, 08034 Barcelona, Spain
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Author to whom correspondence should be addressed.
Academic Editors: Maria D’Amico and Jesus Martinez-Frias
Geosciences 2021, 11(2), 74; https://doi.org/10.3390/geosciences11020074
Received: 23 December 2020 / Revised: 2 February 2021 / Accepted: 4 February 2021 / Published: 9 February 2021
(This article belongs to the Special Issue Engineering Analysis of Near-Source Strong Ground Motion)
In this work, the directionality effects during the MW 7.8 earthquake, which occurred in Muisne (Ecuador) on 16 April 2016, were analyzed under two perspectives. The first one deals with the influence of these effects on seismic intensity measures (IMs), while the second refers to the assessment of the expected damage of a specific building located in Manta city, Ecuador, as a function of its azimuthal orientation. The records of strong motion in 21 accelerometric stations were used to analyze directionality in seismic actions. At the closest station to the epicenter (RRup = 20 km), the peak ground acceleration was 1380 cm/s2 (EW component of the APED station). A detailed study of the response spectra ratifies the importance of directionality and confirms the need to consider these effects in seismic hazard studies. Differences between IMs values that consider the directionality and those obtained from the as-recorded accelerograms are significant and they agree with studies carried out in other regions. Concerning the variation of the expected damage with respect to the building orientation, a reinforced concrete building, which was seriously affected by the earthquake, was taken as a case study. For this analysis, the accelerograms recorded at a nearby station and detailed structural documentation were used. The ETABS software was used for the structural analysis. Modal and pushover analyses were performed, obtaining capacity curves and capacity spectra in the two main axes of the building. Two advanced methods for damage assessment were used to obtain fragility and mean damage state curves. The performance points were obtained through the linear equivalent approximation. This allows estimation and analysis of the expected mean damage state and the probability of complete damage as functions of the building orientation. Results show that the actual probability of complete damage is close to 60%. This fact is mainly due to the greater severity of the seismic action in one of the two main axes of the building. The results are in accordance with the damage produced by the earthquake in the building and confirm the need to consider the directionality effects in damage and seismic risk assessments. View Full-Text
Keywords: damage assessment; directionality effects; intensity measures; parametric model; 2016 Ecuador earthquake damage assessment; directionality effects; intensity measures; parametric model; 2016 Ecuador earthquake
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MDPI and ACS Style

Pinzón, L.A.; Pujades, L.G.; Medranda, I.; Alva, R.E. Case Study of a Heavily Damaged Building during the 2016 MW 7.8 Ecuador Earthquake: Directionality Effects in Seismic Actions and Damage Assessment. Geosciences 2021, 11, 74. https://doi.org/10.3390/geosciences11020074

AMA Style

Pinzón LA, Pujades LG, Medranda I, Alva RE. Case Study of a Heavily Damaged Building during the 2016 MW 7.8 Ecuador Earthquake: Directionality Effects in Seismic Actions and Damage Assessment. Geosciences. 2021; 11(2):74. https://doi.org/10.3390/geosciences11020074

Chicago/Turabian Style

Pinzón, Luis A., Luis G. Pujades, Irving Medranda, and Rodrigo E. Alva 2021. "Case Study of a Heavily Damaged Building during the 2016 MW 7.8 Ecuador Earthquake: Directionality Effects in Seismic Actions and Damage Assessment" Geosciences 11, no. 2: 74. https://doi.org/10.3390/geosciences11020074

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