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Modeling The Observed Site Response From Istanbul Strong Motion Network, Atilla Ansal, Gökçe Tönük, Aslı Kurtuluş, Mustafa Erdik, Stefano Parolai 2010 Bogaziçi University, Turkey

Modeling The Observed Site Response From Istanbul Strong Motion Network, Atilla Ansal, Gökçe Tönük, Aslı Kurtuluş, Mustafa Erdik, Stefano Parolai

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

An extensive site investigation study was carried out in the European side of Istanbul as part of the large-scale microzonation project for the Istanbul Metropolitan Municipality. 2912 borings mostly down to 30m depth with approximately 250m spacing were conducted within an area of 182 sqkm to investigate local site conditions. 55 stations of the Istanbul Rapid Response Network and Ataköy vertical array are located in this area. There have been few small earthquakes in the recent years with local magnitude slightly over M=4. One of these earthquakes took place on 12/3/2008 in Yalova with local magnitude of ...


Overview Of The Seismic Threat In The Central United States, J. David Rogers, Deniz Karadeniz 2010 Missouri University of Science and Technology

Overview Of The Seismic Threat In The Central United States, J. David Rogers, Deniz Karadeniz

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This paper summarizes geological, geophysical and seismological studies in two accepted and one candidate seismic zones in the central United States. The area was shaken by as many as 2,000 felt earthquakes in 1811-12, including four events greater than Magnitudes 7.0. These occurred before the area west of the Mississippi River was settled, so the intensity of shaking was not recorded over much of the affected region. Earthquakes in the central United States are felt over a much broader area than similar magnitude earthquakes in the western United States because of the low attenuation associated with undeformed Paleozoic ...


Performance-Based Design Of Geotechnical Structures: Recent Advances, Susumu Iai, Tetsuo Tobita 2010 Kyoto University, Japan

Performance-Based Design Of Geotechnical Structures: Recent Advances, Susumu Iai, Tetsuo Tobita

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The paper presents an overview of recent advances in earthquake geotechnical engineering with respect to the seismic design of geotechnical structures. The modern principles in seismic design are described along the framework of performance-based design as adopted in the International Standard (ISO23469). With the growing awareness of the need to understand the effect of non-linearity in soils and soil-structure interaction, the paper discusses the highly non-linear response of ground during strong earthquake motions with a peak ground acceleration exceeding 1g, and the highly non-linear behavior of soil-pile interaction, including soil-pile separation. The modern principles in seismic design described in this ...


Pushover And Inelastic-Seismic Response Of Shallow Foundations Supporting A Slender Structure, George Gazetas, Andriani I. Panagiotidou, Nikos Gerolymos 2010 National Technical University of Athens, Greece

Pushover And Inelastic-Seismic Response Of Shallow Foundations Supporting A Slender Structure, George Gazetas, Andriani I. Panagiotidou, Nikos Gerolymos

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The interaction between a surface foundation and the supporting inelastic soil under the action of monotonic, cyclic, and seismic loading is studied numerically. The foundation supports an elastic tall system, the horizontal loading of which induces primarily an overturning moment and secondarily a shear force. Starting from linear elastic behavior, the footing eventually uplifts from the soil, provoking strong inelastic soil response culminating in development of a bearing–capacity failure mechanism and progressive settlement. The substantial lateral displacement of the pier mass induces an additional aggravating moment due to P–δ effect. The paper outlines the moment–rotation–settlement relations ...


Seismic Response Of Deep Foundations Subjected To Liquefaction-Induced Lateral Spreading: Integrated Research And Practical Implications, Ricardo Dobry, Tarek Abdoun 2010 Rensselaer Polytechnic Institute, Troy, NY

Seismic Response Of Deep Foundations Subjected To Liquefaction-Induced Lateral Spreading: Integrated Research And Practical Implications, Ricardo Dobry, Tarek Abdoun

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Integrated research is described on the response of pile foundations subjected to lateral ground deformations associated with sand liquefaction. Field evidence, experiments and analysis have indicated that pile bending and other response aspects depend on a complex manner on – and are very sensitive to - several parameters including the specific foundation and structural system, the free field ground deformation, and soil aspects such as layering and properties of nonliquefied and liquefied soil strata. The research presented focuses on sites where the liquefiable soil reaches the ground surface (especially important to bridge foundations), showing that in this case the permeability and stiffness ...


Understanding Seismic Embankment Dam Behavior Through Case Histories, Pedro Simão Sêco e Pinto 2010 University of Coimbra, Portugal/ National Laboratory of Civil Engineering (LNEC)

Understanding Seismic Embankment Dam Behavior Through Case Histories, Pedro Simão Sêco E Pinto

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

From the lessons learned from past earthquakes, it is noticed that modern embankment dams withstand the design earthquake without significant damages. In spite of this scenario it is important to prevent the occurrence of incidents and accidents of embankment dams during the earthquakes and so a deep understanding of the triggering factors is important. Well documents case histories from many parts of the world related embankment dams behaviour during recent earthquakes were carefully selected and are discussed. Based in the governed factors attention is given to the requirements for materials characterization, modelling, analysis, monitoring and safety evaluation. Ageing effects and ...


Architecture As An Expression Of Identity: Abbas Hilmi Ii And The Neo-Mamluk Style, Nadania Idriss 2010 School of Oriental and African Studies, Germany

Architecture As An Expression Of Identity: Abbas Hilmi Ii And The Neo-Mamluk Style, Nadania Idriss

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This paper examines the religious architecture that was built at the end of the nineteenth, beginning of the twentieth century, during the rule of Abbas Hilmi II (1892-1914). The architecture is examined in light of the political and cultural climate of the time period. European influences brought new tastes for building styles, and the Neo-Mamluk became popularized for mosque architecture.


Comparison Between Clean Sand Liquefaction Charts Based On Penetration Resistance And Shear Wave Velocity, Ricardo Dobry 2010 Rensselaer Polytechnic Institute, Troy, NY

Comparison Between Clean Sand Liquefaction Charts Based On Penetration Resistance And Shear Wave Velocity, Ricardo Dobry

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

A comparison is conducted between clean sand liquefaction charts based, respectively, on normalized point penetration resistance in CPT static cone tests (qc1N) and shear wave velocity (Vs1). Examination of the shape of these field-calibrated curves, review of the factors influencing liquefaction resistance in the laboratory, field correlations between qc1N and Vs1, and field and laboratory evidence related to some of the factors influencing cone penetration resistance and shear wave velocity in sands, are all used in the discussion. It is concluded that the difference between the shapes of the two charts at the high end may ...


Comparison Of Energies Required To Densify Liquefiable Soil, Russell A. Green, James K. Mitchell 2010 Virginia Tech, Blacksburg, VA

Comparison Of Energies Required To Densify Liquefiable Soil, Russell A. Green, James K. Mitchell

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The objective of the study presented herein is to compare the energy required to densify loose, liquefiable sand by various techniques and the energy required to liquefy the soil by earthquake shaking. The states-of-practice for performing remedial ground densification and evaluating earthquake liquefaction potential of loose saturated sands have evolved relatively independently of each other. This is in spite of the fact that the inducement of liquefaction is typically requisite for remedial ground densification of sands. Using the energy required to induce liquefaction as a common metric, simple calculations are presented for estimating the mechanical energy required to densify a ...


I.M. Idriss: A Pioneer In Geotechnical Earthquake Engineering, W. D. Liam Finn 2010 University of British Columbia, Canada

I.M. Idriss: A Pioneer In Geotechnical Earthquake Engineering, W. D. Liam Finn

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.


Performances Of Rockfill Dams During Recent Large Earthquakes, Kenji Ishihara 2010 Chuo University, Japan

Performances Of Rockfill Dams During Recent Large Earthquakes, Kenji Ishihara

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

There has been increasingly high intensity of acceleration ever recorded during earthquakes in recent times. In consistence with this trend several characteristics have been unearthed regarding performances of rockfill dams. With due considerations to these, damage features of high rockfill dams during recent earthqukes in Japan and China are briefly introduced herein, together with those previously reported. As an indicator of overall distress to the dams, the crest settlement was taken up and it was shown that the settlement tends to increase up to about 1.5% of the height of the dam with increasing acceleration during earthquakes.


Sand Plasticity Model For Nonlinear Seismic Deformation Analyses, Ross W. Boulanger 2010 University of California, Davis, CA

Sand Plasticity Model For Nonlinear Seismic Deformation Analyses, Ross W. Boulanger

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

A sand plasticity model for nonlinear seismic deformation analyses is presented. The model follows the basic framework of the stressratio controlled, critical state compatible, bounding surface plasticity model for sand presented by Dafalias and Manzari (2004). Modifications to the model were implemented to improve its ability to approximate the stress-strain responses important to geotechnical earthquake engineering applications; in essence, the model was calibrated at the equation level to provide for better approximation of the trends observed across a common set of experimentally- and case history-based design correlations. An overview of the model formulation and example simulations of element loading tests ...


Criterions, Prediction And Prevention Of Loess Liquefaction, Lanmin Wang, Zhongxia Yuan, Haimei Sun, Jin Deng 2010 Lanzhou Institute of Seismology, China Earthquake Administration, China

Criterions, Prediction And Prevention Of Loess Liquefaction, Lanmin Wang, Zhongxia Yuan, Haimei Sun, Jin Deng

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Although loess liquefaction is not very common during earthquakes in Northwest of China, it is disastrous if it happens. Both study and valid evidence from Haiyuan 8.5 Earthquake in 1920 and Tajikistan 5.9 Earthquake in 1989 have proved that loess liquefaction could be very disastrous under certain conditions. In this paper, the criterions of loess liquefaction are discussed to show that unlike typical liquefaction of sand, loess which falls into the category of both silt clay and clayey silt has unique characteristics during liquefaction test. To predict liquefaction of loess, a simple method based on laboratory test and ...


Effects Of Sample Disturbance And Consolidation Procedures On Cyclic Strengths Of Intermediate Soils, Karina R. Dahl, Ross W. Boulanger, Jason T. DeJong, Michael W. Driller 2010 University of California, Davis, CA

Effects Of Sample Disturbance And Consolidation Procedures On Cyclic Strengths Of Intermediate Soils, Karina R. Dahl, Ross W. Boulanger, Jason T. Dejong, Michael W. Driller

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Sampling and testing of soils to measure engineering properties, such as monotonic and cyclic undrained shear strengths, requires an understanding of the potential effects of sampling disturbance and the selection of appropriate laboratory testing procedures. For clays, past research has provided insights on how sampling methods and laboratory testing procedures can be used in practice to assess and minimize sample disturbance effects. For sands, past research has shown that conventional tube sampling techniques cause excessive disturbance to the soil fabric, such that subsequent measurement of monotonic or cyclic strengths can be greatly in error and misleading. For intermediate soils, the ...


Ground Improvement For Increasing Lateral Pile Group Resistance, Kyle M. Rollins, Matthew E. Adsero, Mark A. Herbst, Nathan Lemme 2010 Brigham Young University, Provo, UT

Ground Improvement For Increasing Lateral Pile Group Resistance, Kyle M. Rollins, Matthew E. Adsero, Mark A. Herbst, Nathan Lemme

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Lateral load tests were performed on a full-scale pile cap in untreated clay along with pile groups involving (a) excavation and replacement with sand backfill, (b) a soilcrete wall along the side of the pile group, and (c) a jet grouted zone below the pile cap. The average compressive strength of the soft, plastic clay increased from an average of 50 kPa to an average of about 1000 kPa with soil mixing (10% cement) and to 3000 kPa with jet grouting (20% cement). Excavation and replacement only increased resistance by about 20%; however, the soil mixed wall increased resistance by ...


Liquefaction-Induced Movements Of Buildings With Shallow Foundations, Jonathan D. Bray, Shideh Dashti 2010 University of California Berkeley, Berkeley, CA

Liquefaction-Induced Movements Of Buildings With Shallow Foundations, Jonathan D. Bray, Shideh Dashti

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Seismically induced settlement of buildings with shallow foundations on liquefiable soils has resulted in significant damage in recent earthquakes. In Adapazari, Turkey multi-story buildings punched into, tilted excessively, and slid laterally on softened ground. The state-of-the-practice still largely involves estimating building settlement using empirical procedures developed to calculate postliquefaction consolidation settlement in the free-field. This approach cannot possibly capture shear-induced and localized volumetricinduced deformations in the soil underneath shallow mat foundations. Geotechnical centrifuge experiments were performed recently to identify the dominant mechanisms involved in liquefaction-induced building settlement. The centrifuge tests revealed that considerable building settlement occurs during earthquake strong shaking ...


Liquefaction Induced Settlement Of Structures, Gopal S. P. Madabhushi, Stuart K. Haigh 2010 University of Cambridge, U. K.

Liquefaction Induced Settlement Of Structures, Gopal S. P. Madabhushi, Stuart K. Haigh

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Soil liquefaction following earthquakes leads to excessive damage to a wide variety of structures. Settlement and rotation of structures following liquefaction have been witnessed in many of the recent earthquakes. Investigation of the mechanisms of failure of structure when the foundation soil suffers either partial or full liquefaction is therefore very important. Dynamic centrifuge tests were conducted at Cambridge and elsewhere on different boundary value problems in which liquefaction of soil models was investigated. Excess pore pressure data and the settlement data for the particular structure that is being investigated are recorded during the centrifuge tests. In this paper the ...


Liquefaction, Screening, And Remediation Of Silty Soils, S. Thevanayagam 2010 University at Buffalo, SUNY Buffalo, NY

Liquefaction, Screening, And Remediation Of Silty Soils, S. Thevanayagam

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Assessing liquefaction potential, in situ screening, and remediation of non-plastic silty soils are difficult problems. Presence of silt particles among the sand grains in silty soils affects the soil response in each of the above cases in different ways. First part of this paper addresses the effects of silt content on liquefaction resistance, hydraulic conductivity, and coefficient of consolidation of silty soils compared to clean sand. Secondly it addresses the effects of silt content and consolidation characteristics on cone resistance of silty soils and sand. A relationship between normalized cone resistance, liquefaction resistance, and consolidation characteristics is presented. The third ...


Principles And Practices Of Seismic Microzonation: Case Studies In India, T. G. Sitharam, P. Anbazhagan, K. S. Vipin 2010 Indian Institute of Science, India

Principles And Practices Of Seismic Microzonation: Case Studies In India, T. G. Sitharam, P. Anbazhagan, K. S. Vipin

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This paper presents an overview of the principles and practices of seismic microzonation with some case studies in India. India has experienced major damages and loss of life due to earthquakes. Macrozonation map in Indian seismic code IS-1893 is frequently revised soon after a major earthquake in the country. New revision which was published in 2002 after Bhuj earthquake in 2001 contains four macro zones. These zones are based on geology and limited seismology input without considering geotechnical aspects such as site effects and liquefaction. In order to understand the earthquake vulnerability of major urban centers and prepare new zonation ...


Recent Advances In Non-Linear Site Response Analysis, Youssef M. A. Hashash, Camilo Phillips, David R. Groholski 2010 University of Illinois at Urbana-Champaign, Urbana, Illinois-USA 61801

Recent Advances In Non-Linear Site Response Analysis, Youssef M. A. Hashash, Camilo Phillips, David R. Groholski

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Studies of earthquakes over the last 50 years and the examination of dynamic soil behavior reveal that soil behavior is highly nonlinear and hysteretic even at small strains. Non-linear behavior of soils during a seismic event has a predominant role in current site response analysis. The pioneering work of H. B. Seed and I. M. Idriss during the late 1960’s introduced modern site response analysis techniques. Since then significant efforts have been made to more accurately represent the non-linear behavior of soils during earthquake loading. This paper reviews recent advances in the field of non-linear site response analysis with ...


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