A Comparative assessment of seismic soil liquefaction triggering relationships

Date

2015

Author

Ilgaç, Makbule

Metadata

Show full item record

Item Usage Stats

540
views

0
downloads

Starting with 1964 Niigata and Alaska Earthquakes, seismic soil liquefaction behavior has become a major research stream in geotechnical earthquake engineering. Since then, a number of investigators (e.g.: Seed et. al. (1984), Liao et. al. (1988, 1998), Toprak et. al. (1999), Cetin et. al. (2004) and Idriss and Boulanger (2004, 2008, 2012)) introduced deterministic and probabilistic liquefaction triggering assessment methodologies. The scope of this study is to develop an SPT-based seismic soil liquefaction triggering relationship on the basis of updated (2015) liquefaction triggering case history database and to assess the reasons behind the difference between CRR boundary curves recommended by Seed et. al. (1984), Cetin et. al. (2004), Idriss and Boulanger (2012) and this study. For this purpose, Cetin et. al. (2004) database is updated and extended with current state of knowledge. In the final database, there exist 211 case histories as compared to 200 case histories from Cetin et. al. (2004). A complete list of changes along with fully documented case history data is presented herein. Some changes in updated (2015) database as compared to (2004) version are applicable to every case history, for example more robust re-execution of rd and soil unit weights. On the other hand, some modifications are case history specific. On the basis of maximum likelihood theorem probabilistic CRR boundary curves are developed. These new boundary curves are used along with the curves of Seed et. al. (1984), Cetin et. al (2004) and Idriss and Boulanger (2012), for comparison purposes. Finally the source of difference between the proposed boundary curves by Seed et. al. (1984), Cetin et. al (2004) and Idriss and Boulanger (2012) is determined as i) differences in the selection of the critical layer and corresponding input parameters of SPT N and CSR values, ii) the execution of rd, K correction terms less importantly also due to MSF, fines correction and its limits, CN and its limits.

Subject Keywords

Soil liquefaction., Soil mechanics., Earthquakes., Seismology.

URI

http://etd.lib.metu.edu.tr/upload/12618818/index.pdf
https://hdl.handle.net/11511/24704

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Estimation of dynamic soil properties and soil amplification ratios with alternative techniques Şişman, Fatma Nurten; Askan Gündoğan, Ayşegül; Özacar, Atilla Arda; Department of Earthquake Studies (2013) Earthquakes are among the most destructive natural disasters affecting urban populations. Structural damage caused by the earthquakes varies depending not only on the seismic source and propagation properties but also on the soil properties. The amplitude and frequency content of seismic shear waves reaching the earth’s surface is dependent on local soil conditions. It is well known that the soft sediments on top of hard bedrock can greatly amplify the ground motion and cause severe structural damage. When ...
An Interdisciplinary Approach for Regional Seismic Damage Estimation Askan Gündoğan, Ayşegül; Erberik, Murat Altuğ; Karim Zadeh Naghshineh, Shaghayegh; Yakut, Ahmet (2017-01-09) In order to mitigate seismic risk in urban regions, the first task is to identify potential seismic losses in future earthquakes. Seismic loss estimation is an interdisciplinary framework including a wide range of contributions from geophysical and earthquake engineers, physical and economic planners to insurance companies. In this study, a moderate size city in Turkey, namely Erzincan, is modeled completely from geophysical attributes to the built environment. Erzincan city is on the eastern part of the No...
SPT Based Seismic Soil Liquefaction Triggering Assessment Çetin, Kemal Önder; Ilgaç, Makbule (null; 2016-09-21) Seismic soil liquefaction has gained significance following the 1964 Niigata and Alaska Earthquakes. The topic has become a major research stream in geotechnical earthquake engineering field. A number of investigators (e.g.: Seed et. al. (1984), Liao et. al. (1988, 1998), Toprak et. al. (1999), Cetin et. al. (2004) and Idriss and Boulanger (2004, 2008, 2012)) introduced deterministic and probabilistic liquefaction triggering assessment methodologies. The scope of this study is to develop an SPT-based se...
A Methodology for Seismic Loss Estimation in Urban Regions Based on Ground-Motion Simulations Ugurhan, Beliz; Askan Gündoğan, Ayşegül; Erberik, Murat Altuğ (2011-04-01) Seismic vulnerability assessment of residential buildings in regions of high seismicity is an interdisciplinary problem requiring major inputs from fields of seismology and earthquake engineering. The basic two components of loss estimation methods are information on regional seismicity and building stock. This study presents a realistic loss estimation methodology where the first component, input ground motions, is obtained from regional ground-motion simulations using the stochastic finite-fault technique...
A review of inverse methods in seismic site characterization Gosselin, Jeremy M.; Dosso, Stan E.; Askan Gündoğan, Ayşegül; Wathelet, Marc; Savvaidis, Alexandros; Cassidy, John F. (2022-04-01) Seismic site characterization attempts to quantify seismic wave behavior at a specific location based on near-surface geophysical properties, for the purpose of mitigating damage caused by earthquakes. In recent years, techniques for estimating near-surface properties for site characterization using geophysical observations recorded at the surface have become an increasingly popular alternative to invasive methods. These observations include surface-wave phenomenology such as dispersion (velocity-frequency ...

Citation Formats

M. Ilgaç, “A Comparative assessment of seismic soil liquefaction triggering relationships,” M.S. - Master of Science, Middle East Technical University, 2015.