Browsing by Author "Sönmez, E."

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Correlation Between Intensity Measures and Damage Caused by the 2023 Türkiye Earthquakes
(International Association for Earthquake Engineering, 2024) Abdo, B.; Eryilmaz Yildirim, M.; Koroglu, F.B.; Ozturk, B.; Sönmez, E.; Speicher, M.S.; Pujol, S.
This article presents comparisons between different ground-motion intensity measures and damage frequencies observed following the Pazarcık (Mw7.8) and Elbistan (Mw7.5) earthquakes that struck Türkiye in February 2023. Various intensity measures were examined including peak ground acceleration (PGA), peak ground velocity (PGV), and spectral ordinates (e.g., Sa0.3, Sa1, Sd1). Two data sources were used to quantify damage frequency: a survey conducted by the team deployed by ACI 133 Reconnaissance Committee involving more than 200 reinforced concrete buildings, and surveys published by the Ministry of Environment, Urbanization, and Climate Change of Türkiye. The differences and commonalities between the two surveys are discussed, and plausible correlations between damage and intensity measures are examined. It is concluded that, relative to other intensity measures, peak ground velocity (PGV) and spectral displacement at a fundamental period of 1.0 second (Sd1) had better correlations with the damage observed from Antakya to Malatya. This observation is consistent with two previously published ideas: a) in the absence of structural damage, drift demand can be expressed as a linear function of PGV, and b) seismic design ought to be focused on drift (and PGV) instead of force (and PGA). © 2024, International Association for Earthquake Engineering. All rights reserved.
An Evaluation of Potential Damage or Collapse of RC Frames and RC Wall Buildings in Strong Earthquakes
(International Association for Earthquake Engineering, 2024) Rodriguez, M.E.; Sönmez, E.
Many past earthquakes have led to collapses or severe damage to RC building frames, causing fatalities or significant economic losses, highlighting the vulnerability of this earthquake-resisting system. These earthquakes have also demonstrated that wall buildings with a good density of walls would survive strong earthquakes with no damage or acceptable damage levels. This study performs simple nonlinear dynamic analyses of RC buildings using SDOF models to compute a seismic damage index and obtain approximate roof drift ratio values in RC frame and RC wall buildings. Ground motion records from the 1985 Mexico, 2010 Chile, and 2023 Türkiye Earthquakes are employed. The computed damage index and roof drift ratio demands in wall buildings for these earthquakes were significantly smaller than those for frame buildings, indicating acceptable levels of building response for wall buildings. These computed findings are consistent with the observed building behavior in the earthquakes selected for this study. These findings suggest that frame buildings should not be constructed in high seismic-risk regions. Instead, emphasizing wall buildings with a robust density of walls could enable a shift from life safety/collapse prevention considerations to functional recovery design. © 2024, International Association for Earthquake Engineering. All rights reserved.