Comparison Between Clean Sand Liquefaction Charts Based On Penetration Resistance And Shear Wave Velocity,
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 …
Reconnaissance Report Of The May 28, 2009 Honduras Earthquake, M 7.3,
2010
Missouri University of Science and Technology
Reconnaissance Report Of The May 28, 2009 Honduras Earthquake, M 7.3, Ronaldo Luna
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A team sponsored by the Earthquake Engineering Research Institute (EERI) and the Geoengineering Extreme Event Reconnaissance (GEER) Association carried out a field investigation in conjunction with Honduran colleagues from June 18-23 to document effects of the May 28 earthquake. The EERI-GEER team was invited by Mr. Marco Sandoval, Executive Director of the Comisión Ejecutiva Valle de Sula (CEVS). Mr. Sandoval sent a team of engineers to accompany the EERI-GEER team. The team included experts in structural, geotechnical engineering, as well as in disaster response and recovery. The investigators were supported by EERI: Abdeldjelil Belarbi and GEER: Ronaldo Luna and Kermit …
The Non-Regularity Of Earthquake Recurrence In California: Lessons From Long Paleoseismic Records From The San Andreas And San Jacinto Faults In Southern California, And The North Anatolian Fault In Turkey,
2010
San Diego State University, San Diego, CA/ Earth Consultants International, Santa Ana, CA
The Non-Regularity Of Earthquake Recurrence In California: Lessons From Long Paleoseismic Records From The San Andreas And San Jacinto Faults In Southern California, And The North Anatolian Fault In Turkey, Thomas Rockwell
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A long paleoseismic record at Hog Lake on the central San Jacinto fault in southern California documents evidence for 18 surface ruptures in the past 3.8-4 ka. This yields a long-term recurrence interval of about 210 years, consistent with its slip rate of ~15 mm/yr and field observations of 3-3.5 m of displacement per event. However, during the past 3800 years, the fault has switched from a quasiperiodic mode of earthquake production, during which the recurrence interval is similar to the long-term average, to clustered behavior with the inter-event periods as short as a few decades (five surface ruptures occurred …
Seismic Response Of Columnar Reinforced Ground,
2010
Missouri University of Science and Technology
Seismic Response Of Columnar Reinforced Ground, C. Guney Olgun
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Ground improvement using stiff columnar reinforcement, such as stone, jet-grout and soil-mix columns, is commonly used for mitigation of seismic damage in weak ground. Seismic shear stress reduction in the reinforced soil mass is often counted on for reducing liquefaction potential. Current design methods assume composite behavior of the reinforced soil, where the shear stress reduction is based on the ratio of the columnar stiffness relative to the soil as well as the area replacement ratio. This implicitly assumes that the stiff columns will deform in pure shear along with the surrounding soft soil. Three dimensional dynamic finite element analyses …
The Importance Of Creating Value In Seismic Design,
2010
Arup, U.K.
The Importance Of Creating Value In Seismic Design, Barnali Ghosh, Zygmunt Lubkowski, Jack Pappin
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Major earthquakes have resulted in devastating consequences in terms of human and economic loss. In almost all the earthquakes we observe the failure of structures, sometimes due to poor construction but also due to designers not identifying the specific geo-hazards (iIntensity of ground motion, faults, liquefaction, slopes etc) which affect these structures. In many cases these damages could have been avoided if the original design had correctly identified the geohazards at the site and incorporated the philosophy of performance based design. In this paper several examples will be presented where the different stages of risk assessment will be identified and …
Meet Our Authors,
2010
Missouri University of Science and Technology
Meet Our Authors, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Post-Conference Tour,
2010
Missouri University of Science and Technology
Post-Conference Tour, Multiple Members
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Organizing Committee,
2010
Missouri University of Science and Technology
Organizing Committee, Multiple Members
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Steering Committee,
2010
Missouri University of Science and Technology
Steering Committee, Multiple Members
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
General Report — Session 5,
2010
University of Patras, Greece
General Report — Session 5, George E. Mylonakis, Achilleas Papadimitriou, Nikos Gerolymos
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Development Of A New Geomaterial For Base Isolation Foundations,
2010
Nihon University Junior College, Japan
Development Of A New Geomaterial For Base Isolation Foundations, Noriaki Sako, Yoshio Ikeda, Yukio Shimomura, Masashi Kawamura
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Design method of rational composite foundation capable of reducing seismic response of structures was studied. Analysis of the effects of damping materials on the reduction of seismic response of a full-scale structure was performed. Shaking experiment and seismic observation for model foundations confirming the damping effects were conducted and development of new damping material are described.
Dynamic Properties Of Rubber Specimens,
2010
Indian Institute of Science, India
Dynamic Properties Of Rubber Specimens, B. N. Madhusudhan, Jyant Kumar
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Resonant column and bender element tests were conducted on rubber specimens to study their dynamic properties, namely, shear modulus (G), damping ratio (D) and Poisson’s ratio (ν). It was found that similar to soil specimens, with an increase in strain level, the shear modulus of rubber decreases continuously whereas the damping ratio increases. The tests were also carried out to find the effect of confining pressures on the rubber specimens. It was observed that for the rubber with the lesser hardness, there was a slight increase in the shear modulus and a decrease in the damping ratio values as the …
Multi Channel Analysis Of Surface Wave (Masw) Testing For Dynamic Site Characterization Of Delhi Region,
2010
IIIT Hyderabad, India
Multi Channel Analysis Of Surface Wave (Masw) Testing For Dynamic Site Characterization Of Delhi Region, D. Neelima Satyam, K. S. Rao
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
After the Bhuj earthquake the national capital region of Delhi attracted major attention of several scientific studies in the recent times. Since Delhi falls in zone IV (IS 1893: 2002) with high seismic activity, there is a great need for site characterization and seismic hazard mapping of the area. Multi Channel Analysis of Surface Wave (MASW) tests were done in Delhi at 118 sites in predefined grids of 2kmX3km each. Shear-wave velocity, VS, is an important parameter for evaluating dynamic behavior of soil. This test carried outdone using 48 channel digital seismograph with 4.5 Hz geophones. Data was analyzed using …
Large Scale Model Test For Pile-Supported Wharf In Liquefied Sand,
2010
National Cheng Kung University, Taiwan
Large Scale Model Test For Pile-Supported Wharf In Liquefied Sand, Wen-Jong Chang, Jyh-Fang Chen, Hsing-Chuan Ho
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Pile-supported wharf is a general option in port design to provide lateral resistance and bearing capacity under both static and dynamic loadings. In situ large-scale physical modeling using surface wave generator was performed to study the dynamic soil-structure interactions in pile-supported wharves and to serve as a prototype for in situ monitoring station. A wharf model consisting of 2 steel pipe piles welded on a steel slab was installed on a reconstituted underwater embankment. Due to screening of stress wave, the two piles are subjected to different loading conditions. Data reduction procedures were developed to analyze coupled shear strain-pore pressure …
Sphere Penetration Experiments In Vertically Vibrated Sand,
2010
Université Catholique de Louvain, Belgium
Sphere Penetration Experiments In Vertically Vibrated Sand, Nicolas Denies, Jean Canou, Jean-Noël Roux, Alain Holeyman
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The paper concerns vibrodriving and vibrocompaction processes applied to granular soils and presents experiments able to characterize the behaviour of sand subjected to vertical vibration. Soil degradation phenomena arising during vibro-driving are first described and the vibro-fluidization of dry granular matter is discussed. The paper concentrates on the shear strength degradation of vibrated dry granular soils. Vertical vibration is then particularly investigated. The volume change during vertical vibration is described and the sand behaviour during vibration is also discussed. One focuses on the influence of the acceleration on the dry density after vibration. Finally, new sphere penetration experiments (SPE) based …
Experiences In Pumice Soil Characterization By Surface Wave Analysis,
2010
Geotechnical consultant, Mexico
Experiences In Pumice Soil Characterization By Surface Wave Analysis, Salvador Lazcano
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Guadalajara, México, is a large city located mainly over a thick deposit (up 100 m) of pumice, in a seismic zone. Then, besides the stiffness of pumice soils, it is important to predict their behavior under seismic movements. Pumice soils are so crushable that SPT or CPT does not adequately characterize them. As a complement or alternative to SPT, CPT and other field testing, in recent years there has been a gradual increment in the use of surface wave analysis for soil characterization, by measuring shear wave velocity (VS). ReMi is one of the surface wave analysis methods …
Attenuation Of Traffic Induced Ground Borne Vibrations Due To Heavy Vehicles,
2010
Middle East Technical University, Turkey
Attenuation Of Traffic Induced Ground Borne Vibrations Due To Heavy Vehicles, Ozgur L. Ertugrul, Deniz Ulgen
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Traffic induced vibrations, which are transmitted through the ground, may interfere with the proper operation of vibration sensitive equipments and cause nuisance on local population. Influence of these vibrations on surrounding buildings and sensitive devices play an important role on acceptance of the projects. In this study, main objective is the estimation of ground-borne vibration levels due to operation of heavy vehicles at two different sites where soil type and stratification significantly differs. For this purpose, site specific vibration surveys are conducted. A series of dynamic finite element modeling analyses are performed to predict actual vibration records at measurement points. …
Dynamic Analysis Of Piles Under Lateral Harmonic Vibration,
2010
K.N. Toosi University of Technology, Iran
Dynamic Analysis Of Piles Under Lateral Harmonic Vibration, Mahmoud Ghazavi, Ahmad Dehghanpour
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper presents a new mathematical approach for the analysis of harmonically vibrating horizontal, linear, elastic uniform pile. The soil properties may vary from layer to layer. No separation is allowed at the soil-pile interface. The pile is modeled as a number of cylindrical segments connected by rigid nodes. The length of each segment is chosen such that the effects of the soil inhomogenity are accounted for. The governing differential equation for an arbitrary pile segment is obtained and solved. According to the pile support types such as pinned, fixed and free conditions, first an arbitrary appropriate value for either …
Ground Improvement Under Dynamic Loading,
2010
Baugrundinstitut Franke-Meißner und Partner GmbH, Germany
Ground Improvement Under Dynamic Loading, M. Ittershagen
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
To analyze the dynamic soil-structure interaction of railway lines on soft soil experimental and numerical investigations have been carried out. The mean intention was to get information about the influence of different soil improvement layouts and further on to establish a design tool for railway lines on soft soil based on the additional results of a numerically supported parametric study. The principle part of the paper is the presentation of the experimental and numerical investigations.
Propagation Of Surface Waves In An Irregular Ground Based On The Thin Layered Element And Finite Element Method,
2010
Chiba University, Japan
Propagation Of Surface Waves In An Irregular Ground Based On The Thin Layered Element And Finite Element Method, Hiroto Nakagawa, Shoichi Nakai
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The problem of wave propagation in an irregular ground is crucial when the landform is complex as in the case of Japan. This problem has been studied by a number of researchers; however, most of studies were made from the viewpoint of body wave propagation and only a few dealt with surface waves. The objective of this study is to examine Rayleigh and Love wave propagation in an irregular ground based on the combined method of thin layered element and finite element. In this paper, the following conclusions are made: 1. H/V spectra of a horizontally layered medium as well …
