Event
AEG Oregon Chapter - December 2024 Meeting
Speaker Bio:
Dr. Ozgun A. Numanoglu is a Consultant Project Geotechnical Engineer, in Schnabel Engineerings Seattle office, specializing in geotechnical and earthquake engineering. His expertise encompasses advanced soil constitutive modeling, numerical analysis, soil-structure interaction, and transportation geotechnics.
Dr. Numanoglu's experience includes static and seismic site characterization through field testing, assessment of laboratory test results on the static and seismic response of soils, and analysis of seismic induced deformations in granular materials, including seismic compression settlements/slope displacements of dry/drained granular materials, liquefaction-induced settlements, and lateral spreading. He conducts seismic site response analyses and develops multi-dimensional numerical models of geosystems and soil-structure systems under both static and dynamic loading conditions to investigate the system response to given loading, boundary, and drainage conditions.
Abstract
On February 6th, 2023, the Kahramanmaras earthquake sequence caused significant damage in the southern and southeastern parts of Turkiye. Two subsequent reconnaissance campaigns, in which the presenter participated, revealed evidence of seismic-induced liquefaction in the city of Iskenderun. Additionally, widespread damage was observed in terms of seismic-induced settlements and tilting of buildings. The presenter documented observations of settlement and tilting for more than forty buildings, three of which will be shown in detail in this presentation in terms of measured versus estimated seismic settlements. The three cases involve settlements of a free-field-like conditions, a building surrounded by negligible ejecta material, and a building surrounded by significant ejecta material. Several simplified models were used to calculate the seismic-induced settlements. Site-specific soil profiles and properties were developed from pre- and post-earthquake standard penetration and cone penetration tests conducted in the areas of interest. Input intensity measures for the seismic settlement calculations, such as peak ground accelerations (PGA) and cumulative absolute velocity (CAV), were obtained from ground motion models (GMMs) and site-specific equivalent linear and nonlinear seismic site response analyses (SSRA). For the SSRA analyses, two approaches were used to develop input ground motions: one directly from a nearby recording station and the other using the double convolution method. The calculated settlements were compared with the measured settlements, and the comparisons indicate that the simplified models provide a rational method for estimating seismic settlements within a factor of 2 of the measured values. Additionally, observations in multi-building clusters highlighted the need for detailed three-dimensional seismic deformation analyses for each site and building, accounting for soil-building interactions to address additional complexities.
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LocationOld Market Pub (View)
6959 SW Multnomah Blvd.
Portland, OR 97223
United States
Timezone: America/Los_Angeles Online Access Information After you have registered for the event, the online access information for the Zoom meeting will be provided on the order confirmation page and email. Please make sure you copy this link prior to the meeting start time.
Categories
| Kid Friendly: No |
| Dog Friendly: No |
| Non-Smoking: Yes! |
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Contact
| Owner: Oregon AEG |
| On BPT Since: Nov 06, 2016 |
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| AEG Oregon |
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