Dynamic Winkler Modulus For Axially Loaded End-Bearing Piles,
2010
University of Patras, Greece
Dynamic Winkler Modulus For Axially Loaded End-Bearing Piles, George M. Anoyatis, George E. Mylonakis
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The problem of dynamic pile-soil interaction and its modeling through the concept of a Dynamic Winkler Foundation are revisited. It is shown that depth-dependent Winkler springs and dashpots, obtained by dividing the complex-valued soil shear tractions and the corresponding displacements along the pile, may faithfully describe pile-soil interaction, contrary to common perception that the Winkler model is always approximate. A theoretical wave model is then derived for analyzing the response of axially loaded endbearing piles embedded in a homogeneous viscoelastic soil medium. Closed-form solutions are obtained for: (i) the displacement field in the soil and along the pile; (ii) the …
Earthquake Input Motions And Seismic Site Response In A Centrifuge Test Examining Sfsi Effects,
2010
University of California at Berkeley, Berkeley, CA
Earthquake Input Motions And Seismic Site Response In A Centrifuge Test Examining Sfsi Effects, Henry B. Mason, Jonathan D. Bray, Katherine C. Jones, Zhiqiang Chen, Tara C. Hutchinson, Nicholas W. Trombetta, Benjamin Y. Choy, Bruce L. Kutter, Gregg L. Fiegel, Jack Montgomery, Roshani J. Patel, Robert D. Reitherman, Chandrakanth Bolisetti, Andrew S. Whittaker
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper describes the ground motion selection process and reports observed seismic site response and SFSI effects during a dynamic centrifuge test (Test-1). The centrifuge test is the first in a series of tests examining the effects of SFSI in dense urban environments. The objective of Test-1 is to examine SFSI effects for two structures that are located a significant distance apart and essentially isolated. The model structures represent a three-story building founded on spread footings and a nine-story structure founded on a threestory basement. The structures are sited on a dry, dense bed of Nevada Sand. The centrifuge model …
Designing Optimization For Some Eolian Power Unit Taking Into Account The Seismic Loads Influence,
2010
Ovidius University Constanta, Romania
Designing Optimization For Some Eolian Power Unit Taking Into Account The Seismic Loads Influence, Dragos Vintila, Diana Tenea, Anton Chirica
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In the eastern part of the Romanian territory there are wind intensity conditions for some big eolian power units. From lithological point of view, the mentioned area is characterized by a loessial stratum of 3 up to over 20m deep which covers green shale rocks. The paper presents the designing consideration discussed in order to obtain the most economical foundation option. The corresponding calculus conclusions about the soil-structure interactions in seismic conditions are also revealed.
Assessment Of Liquefaction-Induced Foundation Soil Deformations,
2010
Middle East Technical University, Turkey
Assessment Of Liquefaction-Induced Foundation Soil Deformations, K. Onder Cetin, Berna Unutmaz, H. Tolga Bilge
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Although there exist some consensus regarding seismic soil liquefaction triggering assessment of free field soil sites, estimating the liquefaction triggering potential beneath building foundations still stays as a controversial and a difficult issue. Assessing liquefaction triggering potential under building foundations requires the estimation of cyclic and static stress state of the soil medium. In the recent studies (e.g. Unutmaz 2008), the cyclic stress ratio corrected for Kα and Kσ effects under and adjacent to building foundations subjected to cyclic loading are to be estimated with the help of a series of 2-D and 3-D numerical simulations for different …
Assessment Of Liquefaction Susceptibility Of Geological Units In The Area Of Gulf Of Corinth, Greece,
2010
Aristotle University of Thessaloniki, Greece
Assessment Of Liquefaction Susceptibility Of Geological Units In The Area Of Gulf Of Corinth, Greece, George Papathanassiou, Sotiris Valkaniotis, Spyros Pavlides
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The coastal area of Gulf of Corinth is characterized as medium to high seismicity zone since devastating earthquakes occurred during a 2500 years period. One of the most characteristic events is the 373 B.C. Eliki earthquake that triggered severe secondary effects including soil liquefaction and large scale landslides. The basic aim of this paper is the compilation of a map regarding the liquefaction susceptibility in the coastal area of Gulf of Corinth, Central Greece. In order to achieve this, we used data regarding the age and depositional process of sediments the value of peak ground acceleration (PGA) and the occurrence …
Case Histories Of Widespread Liquefaction And Lateral Spread Induced By The 2007 Pisco, Peru Earthquake,
2010
Kleinfelder, San Diego, CA
Case Histories Of Widespread Liquefaction And Lateral Spread Induced By The 2007 Pisco, Peru Earthquake, Jorge F. Meneses, J. Alva, B. Cox, V. Moreno, M. Olcese, R. Sancio, J. Wartman
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Case histories of widespread liquefaction and lateral spread induced by the Mw 8.0, 2007 Pisco, Peru earthquake and observed during a post-earthquake GEER reconnaissance are presented. A long duration of the earthquake over 200 seconds and two phases of strong ground motion induced widespread liquefaction and lateral spread of sand coastal deposits and road embankments over a total length of approximately 100 km of coastal region. Six case histories of liquefaction are presented and discussed including a massive lateral spread of a marine terrace believed to be as large or even larger than that reported along the Shinano River …
Cpt-Based Comparative Mapping Of Liquefaction Hazard For Large Areas,
2010
University of Florence, Italy
Cpt-Based Comparative Mapping Of Liquefaction Hazard For Large Areas, Johann Facciorusso, Marco Uzielli, Giovanni Vannucchi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Liquefaction hazard mapping provides a useful tool for risk mitigation planning in seismic areas. Mapping for large areas is usually pursued by applying simplified criteria which rely on geological/lithological data and/or index properties of investigated soils, and in which local seismicity is not adequately considered (grade-1 methods). When a large number of in situ-tests and a reliable seismic hazard analysis are available, liquefaction hazard can be investigated by applying in-situ test-based methods accounting for seismic loading and the susceptibility of in-situ soil volumes (grade-2 methods). Advances in geotechnical earthquake engineering currently allow both deterministic and probabilistic evaluation of liquefaction potential …
Dem Simulation Of Liquefaction-Induced Lateral Spreading,
2010
Southern Methodist University, Dallas, TX
Dem Simulation Of Liquefaction-Induced Lateral Spreading, Usama El Shamy, Mourad Zeghal, Ricardo Dobry, Tarek Abdoun, Sabanayagam Thevanayagam, Ahmed Elgamal
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper reports the results of a model-based simulation of 1g shake table tests of sloping saturated granular deposits subjected to seismic excitations. The simulation technique utilizes a transient fully-coupled continuum fluid discrete particle model of the watersaturated soil. The fluid (water) phase is idealized at a macroscale using an Eulerian averaged form of Navier-Stokes equations. The solid particles are modeled at the microscale as an assemblage of discrete spheres using the discrete element method. The interphase momentum transfer is accounted for using an established relationship. Numerical simulations were conducted to investigate the liquefaction induced lateral spreading of a mild-sloped …
Prediction Of Lateral Displacement Of Liquefaction Induced Ground Using Extreme Learning,
2010
National Institute of Technology Rourkela, India
Prediction Of Lateral Displacement Of Liquefaction Induced Ground Using Extreme Learning, Sarat Kumar Das
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Though various mechanistic based models are there for prediction of lateral displacement of ground, the statistical/ empirical methods based on the insitu data is most widely used. The artificial neural network method has been extensively used an alternate statistical method in different complex geotechnical engineering problems. Due to inherent difficulty of generalization in artificial neural network method, support vector machine, which is based on statistical learning algorithm is also being used. This paper describes use of extreme learning machine for prediction of large lateral displacement of liquefaction induced ground during an earthquake. Extreme learning machine is an artificial intelligence techniques …
Seismic Analysis Of Saturated Sand Deposits With Silt Layers,
2010
Yildiz Technical University, Turkey
Seismic Analysis Of Saturated Sand Deposits With Silt Layers, Murat Tonaroglu, Kutay Ozaydın, S. Umit Dikmen
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Liquefaction of saturated sands during earthquakes is known to be the cause of significant earthquake related damages, including loss of bearing capacity, lateral flow and spreading, slope failures. In recent earthquakes including the1999 Marmara Earthquake in Turkey, field observations have indicated that silt inclusions or silt layers in the sandy deposits can have significant effects on development of liquefaction. The objective of this work is to analytically study the behavior of saturated sand deposits with silt layers. For this purpose, a hypothetical soil profile in which silt layers exist has been selected. The selected profile was then modeled and analyzed …
3d Analysis Of The Seismic Response Of Seven Oaks Dam,
2010
URS Corporation, Oakland, CA
3d Analysis Of The Seismic Response Of Seven Oaks Dam, Lelio Mejia, Ethan Dawson
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Procedures for the three-dimensional (3-D) dynamic analysis of earth dams have been available for over 25 years. However, additional case histories are needed to assess whether such procedures are capable of simulating the seismic response of dams in narrow canyons, and to further evaluate the effects of 3-D behavior on the response of such dams. This study was aimed at identifying the vibration characteristics of Seven Oaks Dam during the 2005 Yucaipa and 2001 Big Bear Lake earthquakes, and at evaluating the applicability of 3-D and 2-D numerical procedures to simulate the response of the dam. Accelerograms recorded on the …
A Probabilistic Method For The Prediction Of Earthquake-Induced Slope Displacements,
2010
University of Genoa, Italy
A Probabilistic Method For The Prediction Of Earthquake-Induced Slope Displacements, Simone Barani, Paolo Bazzurro, Fabrizio Pelli
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This work presents a probabilistic method for estimating earthquake-induced nonlinear slope displacements. This method is applicable to any kind of slope, embankment and earth/rockfill dam. When coupled with Probabilistic Seismic Hazard Analysis at the slope site, it produces estimates of the annual probability that a permanent deformation of the slope will be exceeded. The proposed method uses a set of 2D numerical analyses with non-linear constitutive relationships for the soil formations to establish a probabilistic relationship between one or more ground motion parameters and the permanent displacement at a specific location within the slope. The analyses, which are performed using …
2d Fem Analysis Of Earth And Rockfill Dams Under Seismic Condition,
2010
Indian Institute of Technology Kanpur, India
2d Fem Analysis Of Earth And Rockfill Dams Under Seismic Condition, Prabir K. Basudhar, N.S.V. Kameswara Rao, M. Bhookya, Arindam Dey
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The paper pertains to the seismic analysis of earth and rockfill dams with the aid of MSC_ Nastran (Windows) package. After validation, the package has been used to investigate the dynamic response of Tehri Dam, located in the seismically active region of Himalayas. A 2D FEM analysis is adopted wherein the dam has been modeled as a linear, elastic, non-homogeneous material. The base acceleration data of the Bhuj Earthquake has been used as an input motion. Effect of Poisson’s ratio and the ratio of the canyon length to the height of the dam has been investigated and is reported. Acceleration-time …
Static Load Induced Liquefaction, Steels Corners Road Embankment Failure,
2010
Gannett Fleming Engineers and Architects, P.C., Akron, OH
Static Load Induced Liquefaction, Steels Corners Road Embankment Failure, Mitchell W. Weber, Alexandre J. Bredikhin
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A simple, roadway widening became significantly more expensive when geologic conditions conspired to complicate the project. The widening was to be accomplished by the construction of a 25-foot wide and 15-foot high embankment. The embankment was located adjacent to a “wetland” area and pond. Fill placement begin and a height of 7 feet was reached when operations ceased for the week. Work began two days later. A 400-foot long scarp formed and the fill “moved” nearly 4 feet vertically and 1-foot laterally. An initial suspicion of settlement due to compression of peat was dismissed when no organic deposits were found …
Soft Soil Effect On Soft Storey Response,
2010
Bangladesh University of Engineering & Technology, Bangladesh
Soft Soil Effect On Soft Storey Response, Tahmeed M. Al-Hussaini, Kamruzzaman Khan
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Multi-storied reinforced concrete frame (RCF) buildings with open first storey to provide parking space is common in Dhaka city, the capital of Bangladesh. Such buildings are likely to produce soft storey action when subjected to earthquake loadings. Bangladesh building code places Dhaka in a moderate earthquake zone with a zone coefficient (Z) value of 0.15. Several soft soil sites exist in the city, most of which have been created by filling up of low lands and water bodies without proper compaction. Such soft soil sites are likely to produce major site amplification effects during earthquakes. One-dimensional wave propagation using the …
A Review Of Seismic Lrfd (Load-And-Resistance Factor Design) Method For Mse (Mechanically Stabilized Earth) Walls,
2010
The Reinforced Earth Company, San Diego, CA
A Review Of Seismic Lrfd (Load-And-Resistance Factor Design) Method For Mse (Mechanically Stabilized Earth) Walls, Fransiscus S. Hardianto, Kim M. Truong, John E. Sankey
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The introduction of AASHTO’s LRFD (load-and-resistance factor design) method for the design of MSE (mechanically stabilized earth) walls in 2004 has gradually replaced conventional state-of-the-practice seismic ASD (allowable stress design) method in some states, and by FHWA mandate should completely replace the ASD method by 2010. Limit equilibrium analyses based on Mononabe- Okabe (M-O) pseudo-static method had been the standard method of estimating the seismic external thrust and inertia force for MSE walls. Considering the flexible nature of MSE walls that allow deformation without compromising structural integrity, in the LRFD method, the displacement based pseudo-static method that was developed from …
Discussions On Dynamic Interaction Between Piles And Large Particle Rockfill,
2010
Oregon State University, Corvallis, OR
Discussions On Dynamic Interaction Between Piles And Large Particle Rockfill, Yohsuke Kawamata, Scott A. Ashford
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A series of full-scale laterally loaded pile tests were conducted at the University of California, San Diego in 2007 in order to obtain a better understanding about pile-rockfill interaction for seismic design of port facilities. The project was composed of three experiments where the cyclic lateral loads were cyclically applied at the heads of the piles fully instrumented using a hydraulic actuator. Comparing the experimental and numerical results, assessments of p-y curves used for current design practice were performed. As a result, it was found that the soil pile springs currently used for design gave much lower lateral resistance than …
Diaphragm Walls Seismic Design According To The Eurocodes,
2010
ISEL (Lisbon Technical University), Portugal
Diaphragm Walls Seismic Design According To The Eurocodes, José Matos E Silva
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Although one can think that it is very low the probability of a seism occurrence during the execution of an excavation in an urban lot protected by a diaphragm wall curtain, reality shows that whenever a seism occurs in an urban area several diaphragm walls will be affected by it. So it is advisable to consider the seismic action when designing a diaphragm wall curtain. The Eurocodes consider the seismic actions in Eurocode 8 (EC 8) and recommend the use of the Mononobe-Okabe method when dealing with soil retaining structures. The Eurocodes consider the possibility of each European country to …
Effect Of Elastic And Inelastic Dssi On Seismic Demands Of Sdofs Structures,
2010
Pontificia Universidad Católica de Chile, Chile
Effect Of Elastic And Inelastic Dssi On Seismic Demands Of Sdofs Structures, Esteban Sáez, Fernando López-Caballero, Arézou Modaressi-Farahmand-Razavi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In general, under earthquake loading, the soil reaches the limit of its elastic behavior before the structural elements. Thus, an earthquake analysis approach assuming inelastic structural behavior under fixed base condition or with elastic dynamic soil-structure interaction (DSSI) hypothesis may be inadapted. This paper describes the investigation conducted in order to define the contribution of the pure elastic DSSI effects in the complete inelastic DSSI problem. With this purpose, a comparative analysis between elastic and inelastic soil behavior assumptions for two inelastic single-degree-of-freedom (SDOF) structures and two soils is carried out. The results point out that, in general, inelastic soil …
Evaluation Of Deformation Behavior Of Quay Walls Under Earthquake Loading,
2010
Iran University of Science and Technology, Iran
Evaluation Of Deformation Behavior Of Quay Walls Under Earthquake Loading, Masoomeh Khodabakhshi, Mohammad Hassan Baziar
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Ports are often regional economic centers and important components of regional and local transportation lifeline systems. Because of these reasons, the downtime of the ports due to natural disaster such as an earthquake results in severe economic loss. Gravity quay walls are the most common type of construction for docks because of their durability, ease of construction and capacity to reach deep seabed levels. Past earthquakes demonstrated that the seismic behavior of port structures such as quay walls was significantly governed by the properties of soils. The 1995 Hyogoken- Nanbu (Kobe) Earthquake brought great damage to structures in the Port …
