Topographic Site Effects Evaluation For The Monte Po Hill In The City Of Catania (Italy),
2010
University of Catania, Italy
Topographic Site Effects Evaluation For The Monte Po Hill In The City Of Catania (Italy), Antonio Ferraro, Salvatore Grasso, Michele Maugeri
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The Monte Po Hill is located in the North-eastern part of the city of Catania; this area is prone to high seismic risk due to the presence of several constructions, including a school, in the vicinity of a toe of a slope, characterized by precarious stability conditions. The study has regarded the evaluation of site effects in correspondence of the site, to which corresponds a different value of the Seismic Geotechnical Hazard. In the beginning of 2007 a seismic station has been also located into the school building, with the aim of recording seismic events. Seismograms obtained by the seismic …
Earthquake Induced Liquefaction Using Shake Table Test,
2010
College of Engineering, Pune, India
Earthquake Induced Liquefaction Using Shake Table Test, S. R. Pathak, R. S. Dalvi, A. D. Katdare
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Loose saturated cohesionless soils may undergo liquefaction due to strong ground motions. Such liquefaction causes significant damage to the structure resting on such soil. The extent of damage primarily depends upon soil properties, intensity of earthquake and type of structure. Various analytical models have been developed to estimate the likelihood of liquefaction of particular site based on field performance. However, if it is possible to identify the sites which are likely to liquefy due to specific intensity of earthquake it will help implementing the reduction in the damage which it would otherwise cause. One such analytical model has been developed …
Numerical Modelling Of Earthquake-Induced Rock Landslides: The 1783 Scilla Case-History (Southern Italy),
2010
University of Rome “Sapienza”, Italy
Numerical Modelling Of Earthquake-Induced Rock Landslides: The 1783 Scilla Case-History (Southern Italy), Francesca Bozzano, Salvatore Martino, Eliana Esposito, Alfredo Montagna, Luca Lenti, Antonella Paciello, Sabina Porfido
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The coastal M. Pacì rock-avalanche was triggered by the 6th February 1783 earthquake near the village of Scilla (southern Calabria) and involved a subaerial volume of about 5·106 m3. This landslide produced a tsunami wave responsible for more than 1500 human life losses near Marina Grande beach. A geological survey and a geomechanical characterization of both the intact rock and the jointed rock mass outcropping in the landslide slope were carried out to obtain an engineering-geology model of the landslide according to an equivalent-continuum approach. Dynamic numerical modelling by FDM code FLAC 6.0 was performed to back-analyse …
Seismic Slope Stability Of Reactivated Landslides — A Performance Based Analysis,
2010
University of California Los Angeles, Fullerton, CA
Seismic Slope Stability Of Reactivated Landslides — A Performance Based Analysis, Binod Tiwari, Michael Hillman, Keyur Ajmera, Beena Ajmera
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The purpose of this study is to identify and analyze the differences between the various methods of slope stability analysis with respect to the height of the water table, and earthquake excitation. This was achieved through analysis of a cross section of the 2005 Bluebird Canyon Landslide in Laguna Beach, California. The profile was analyzed with the slope stability analysis software Rocscience Slide, using eight different methods, varying the water table in two meter increments and the seismic coefficient in increments of one tenth. A total of 15 different water tables were used with 10 different seismic loadings, yielding a …
Seismic Stability Of The Nailed Slopes,
2010
Chapman University, Orange, CA
Seismic Stability Of The Nailed Slopes, Mehdi M. Waseem, Agarwal Pratibh
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The study undertaken in this project pertains to the determination of ultimate bearing capacity of nailed slopes. In this soil is modeled as composed of homogeneous layers of soils. Analysis has been carried out to obtain an upper bound solution of the problem. A two dimensional collapse mechanism has been assumed to ascertain the bearing capacity with the velocity discontinuities radiating from the applied strip load and satisfying the compatibility of the displacements. The mechanism is defined by relevant angles or lengths. Each velocity vector makes an angle of f¢ with the direction of discontinuity. For fu =0 there …
The Effect Of Geometry Changes On Sliding-Block Predictions,
2010
Hellenic Open University, Greece
The Effect Of Geometry Changes On Sliding-Block Predictions, Constantine A. Stamatopoulos, Constantine Mavromihalis, Sarada Sarma
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The sliding-block model is often used for the prediction of permanent co-seismic displacements of slopes and earth structures. This model assumes motion in an inclined plane but does not consider the decrease in inclination of the sliding soil mass as a result of its downward motion, which is the usual state in the field. The paper studies the above effect and proposes an empirical equation correcting the predictions of the sliding-block model. The investigation is performed using the recently-developed multi-block model.
Effect Of Liquefaction On Pile Shaft Friction Capacity,
2010
University of Cambridge, U.K.
Effect Of Liquefaction On Pile Shaft Friction Capacity, M. E. Stringer, S. P. G. Madabhushi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Piled foundations are commonly used worldwide, and observed failures of these foundations during earthquakes has led to active research in this area. However, the way in which piles support axial loads during earthquakes is still not fully understood. In this paper, the results from centrifuge tests are presented which consider how axial loads are carried by piles during earthquake loading. It will be shown that the piles in dry soils mobilise additional shaft friction to carry the seismically induced axial loading. However, in the case of a pile group passing through a liquefiable soil layer and founded in a dense …
Effects Of Recorded Free-Field Motion On The Response Of Buildings Considering Soil-Structure Interaction Effects,
2010
Iran University of Science and Technology, Iran
Effects Of Recorded Free-Field Motion On The Response Of Buildings Considering Soil-Structure Interaction Effects, Fereidoun Amini, Masoud Shadlou
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
One of the intents of this study is to demonstrate some lacking accurate results of seismic code for considering soil-foundationstructure interaction (SFSI) effects. The other objective of this study is to evaluate the effects of type of recorded motion on the response of moderately flexible building considering SFSI effects. The effects of SFSI, under plane-strain conditions, have been studied by substructure approach for buildings supported by rigid foundations on a homogeneous, isotropic and elastic half-space. 32 data motions recorded in Imperial Valley-06 (1979) earthquake are used to demonstrate some intents of this study. It can be concluded that if it …
Experimental Soil - Foundation - Bridge Pier Interaction : Towards A Reversal Of Capacity Design,
2010
National Technical University of Athens, Greece
Experimental Soil - Foundation - Bridge Pier Interaction : Towards A Reversal Of Capacity Design, Ioannis Anastasopoulos, Takis Georgarakos, Vasilis Drosos, George Gazetas
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper presents a new seismic design philosophy, which under-designs the foundation to act as a “fuse” in case of strong seismic shaking. A simplified bridge pier is used to illustrate the advantages and disadvantages of this new philosophy compared to conventional capacity design. For this purpose, two alternatives are compared : one with an over-designed foundation, in accordance with conventional capacity design (so that the plastic “hinge” develops in the superstructure), and one with under-designed foundation. The performance of the two alternatives is investigated through shaking table testing of reduced scale models, using real accelerograms and artificial sinusoidal motions. …
Investigation Of Non-Uniform Pile Behaviour Under Torsional Harmonic Vibration,
2010
K.N. Toosi University of Technology, Iran
Investigation Of Non-Uniform Pile Behaviour Under Torsional Harmonic Vibration, M. Ghazavi, M. Afzalirad
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Pile foundations for machines and structures are often subjected to horizontal or vertical harmonic vibrations. However, in some situations, piles also experience torsional harmonic vibrations. While there are some research work on tapered piles imposed to horizontal or vertical harmonic vibrations, the response of such piles till now is lacking. In this study, the elasto-dynamic theory has been used to derive the governing differential equation on a tapered pile experiencing torsional harmonic vibration. In this approach, the pile is assumed the pile has circular cross sectional area and consists of elastic material. It is further assumed that there is sufficient …
Numerical Modeling Of Buried Pipeline Crossing A Fault,
2010
IIIT Hyderabad, India
Numerical Modeling Of Buried Pipeline Crossing A Fault, Chaudhari Vasudeo Govind, Ramancharla Pradeep Kumar
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Pipelines are common transportation means for oil and natural gas, which act as an important lifeline facility for any nation. Often the design of these pipelines is a difficult task because they commonly are installed underground passing through different types of soil media. Many of these existing pipelines run through the faulted area, which continuously exposed to considerable risk of failure due to movement along the fault. In this paper, a numerical study is carried out to understand stress development in buried pipeline subjected to fault motion with Mundra-Delhi pipeline as a case study. For this purpose, a 3D finite …
Three-Dimensional Stability Analysis Of The Central Rotunda Of The Catacombs Of Kom El-Shoqafa, Alexandria, Egypt,
2010
Cairo University, Egypt
Three-Dimensional Stability Analysis Of The Central Rotunda Of The Catacombs Of Kom El-Shoqafa, Alexandria, Egypt, Sayed Hemeda, Kyriazis Pitilakis, Elias Bakasis
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A three-dimensional numerical model has been proposed of the central Rotunda of the catacombs of Kom El-Shoqafa with its six supporting rock pillars, excavated in sandy oolitic limestone deposit. The model was based on a 3D realistic simulation of the problem geometry. The required input for the analysis (strength and deformability of the rock materials) was derived from laboratory tests and empirical assessments. The rock mass in general is normally widely jointed (> 1 m). In the analysis it is considered as an un-jointed homogeneous medium with low strength. Where 2D analysis fails to model properly the column behaviour, we …
Using Tactile Pressure Sensors To Measure Lateral Spreading Induced Earth Pressures Against A Large, Rigid Foundation,
2010
University of Illinois at Urbana-Champaign, IL
Using Tactile Pressure Sensors To Measure Lateral Spreading Induced Earth Pressures Against A Large, Rigid Foundation, Scott M. Olson, Mark R. Muszynski, Carmine Polito, Youssef M. A. Hashash, Camilo Phillips
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Two centrifuge tests were performed at the NEES facility at Rensselaer Polytechnic Institute (RPI) to observe lateral earth pressures mobilized against a rigid foundation element during liquefaction-induced lateral spreading, as part of a larger NEESR study aimed at developing novel approaches to mitigate the effects of seismically-induced ground failures on large, rigid foundation elements. Models were constructed in a laminar box to allow unimpeded downslope soil displacement, and the sand in the model was liquefied during the centrifuge test. Lateral pressures prior to, during, and after shaking and liquefaction were directly measured using a novel device: tactile pressure sensors. Prior …
Calibration Of Soil Amplification Factors For Real-Time Ground-Motion Scenarios In Italy,
2010
University of Genoa, Italy
Calibration Of Soil Amplification Factors For Real-Time Ground-Motion Scenarios In Italy, Simone Barani, Roberto De Ferrari, Gabriele Ferretti, Daniele Spallarossa
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This study deals with the calibration of soil amplification factors to be used for generating site-specific, real-time (or quasi real-time) ground-motion scenarios in Italy. To this end, the ground response of 100 soil profiles is studied through 1-dimensional (1D) equivalent-linear numerical simulations. Several real, rock ground-motion time histories, grouped into different peak ground acceleration (PGA) classes, are driven through the models of the soil columns. Soil amplification factors are then calculated using different definitions, either as the ratio of the spectral acceleration at the surface to the spectral acceleration at the rock outcrop or by dividing the (acceleration or pseudo-velocity) …
Other Special Presentations (Osp) Speakers,
2010
Missouri University of Science and Technology
Other Special Presentations (Osp) Speakers, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Behavior Of Model Piles In A Liquefiable Soil In Shaking Table Tests,
2010
National Taiwan University, Taiwan
Behavior Of Model Piles In A Liquefiable Soil In Shaking Table Tests, Chia-Han Chen, Tzou-Shin Ueng
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The responses of model piles in a liquefiable ground under one- and two-dimensional shakings were studied in a physical model test using a large biaxial laminar shear box on the shaking table at the National Center for Research on Earthquake Engineering (NCREE), Taiwan. The model piles were made of stainless steel pipe and aluminum alloy pipe with an outer diameter of 101.6 mm and a wall thickness of 3.0 mm for the study of the soil-pile interactions with two kinds of stiffness of pile. Each model pile was placed in the shear box containing saturated clean fine sand. The pile …
Investigation Of The Coefficient Of Earth Pressure For Improved Ground By Compaction Grouting In The Full-Scale Field Liquefaction Experiment,
2010
Port and Airport Research Institute, Japan
Investigation Of The Coefficient Of Earth Pressure For Improved Ground By Compaction Grouting In The Full-Scale Field Liquefaction Experiment, Hiroshi Nakazawa, Takahiro Sugano, Takashi Shinsaka, Masaki Adachi, Kazuhiro Yamada
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper describes the effect of countermeasures for liquefaction by compaction grouting, which was investigated by the experiment of full-scale field liquefaction by controlled blast technique. The experiment was conducted to assess the performance of airport facilities subjected to liquefaction, to investigate damage mechanism, and to estimate the effect of countermeasures for liquefaction by compaction grouting applied to liquefiable sand layer under runway pavement. In this study, before and after grouting and after artificial liquefaction caused by in-situ blasting, self boring pressure-meter tests at the center and the edge of a grouted area were carried out to investigate the coefficient …
Evaluation Of Seismic Demand Of Pile Foundation For Performance Based Design,
2010
Iran University of Science and Technology, Iran
Evaluation Of Seismic Demand Of Pile Foundation For Performance Based Design, M. H. Baziar, A. H. Ghaderinia
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Accurate prediction of seismic performance of structures is important in reducing risks from earthquakes. Within the context of emerging performance-based earthquake engineering trends, seismic performance is measured with respect to the demand of engineering systems during a seismic event as opposed to the conventional factor of safety approach. Investigation of the correlation between so-called engineering demand parameters and various intensity measures has received substantial attention in earthquake engineering, as accurate prediction of seismic demand is desired in performance based seismic design. In this study the seismic demand of pile foundations are investigated in a performance based approach. A soil-pile-superstructure model …
Overview Of The Seismic Threat In The Central United States,
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 age strata …
Soil Dynamics Course Speakers,
2010
University of California, San Diego (UCSD
Soil Dynamics Course Speakers, Ahmed Elgamal, Shamsher Prakash
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
