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 …
Investigation Of Vibration Caused By Traffic And Railway Load,
2010
University of Belgrade, Republic of Serbia
Investigation Of Vibration Caused By Traffic And Railway Load, Hadži-Niković D. Gordana, Ćorić B. Stanko
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Two examples related to investigation of vibrations in civil engineering structures are presented. In the first example it is shown how it is possible to decrease vibration in underground structures. These vibrations are caused by train load. It is shown by the results of presented dynamic analysis that the use of special elastomer is very important in engineering practice in order to decrease structural vibrations. Second example presents the foundation for special equipment - eletronic balances, which are very sensetive, even to small displacement. Presented dynamic analysis is related to the vibrations caused by heavy traffic load in order to …
Natural Frequency Calculation Of A Pile-Soil System In Dry Sand Under An Earthquake Loading,
2010
Seoul National University, Korea
Natural Frequency Calculation Of A Pile-Soil System In Dry Sand Under An Earthquake Loading, Eui-Kyu Yang, Sun-Yong Kwon, Jung-In Choi, Myoung Mo Kim
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A new method was proposed in this study to evaluate the natural frequency of a pile-soil system under earthquake loading using a simple mass-spring model. The diagonal, 4x4, mass matrix in the model consisted of concentrated masses of a pile and a superstructure. The flexural stiffness of the pile and the spring stiffness between the pile and the soil were used to construct the stiffness matrix in the model. These two matrices were then input in the frequency equation for calculating the natural frequency of the pile system. The spring stiffness between the pile and the soil, which considerably influences …
Seismic Behavior Of Batter Pile Foundation: Kinematic Response,
2010
Shimizu Corp., Japan
Seismic Behavior Of Batter Pile Foundation: Kinematic Response, Takashi Tazoh, Masayoshi Sato, Jiho Jang, Yoichi Taji, George Gazetas
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
We carried out centrifuge tests to clarify the seismic behavior of batter-pile foundations. A vertical-pile foundation and a batter-pile foundation without the presence of a superstructure were installed parallel to each other in a soil container filled with dry sand, and were excited simultaneously. Through a comparison of the acceleration and displacement response of the footing, as well as the axial and bending strain of the piles for the two pile foundations, the kinematic response of the seismic behavior of the batter-pile foundation was experimentally investigated.
Seismic Soil-Pile Interaction: Physical Processes And Analytical Models,
2010
Parsons Brinckerhoff, Inc., New York, NY
Seismic Soil-Pile Interaction: Physical Processes And Analytical Models, Sanjeev Malhotra
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Seismic soil-pile-structure interaction (SSPSI) is a complex process involving several, simultaneously occurring and, sometimes compensating phenomena. The physical processes that occur in the soil when a pile supported structure undergoes earthquake loading consist of pore-pressure generation, ground deformation and subsequent cyclic degradation, strain rate effects and gap-slap mechanism. Modeling these physical phenomena numerically is a challenge. Of the various approaches available in practice, the p-y method for evaluating lateral pile response is by far the most common. However, at present, a consensus has not been established among practitioners on the appropriateness of using p-y curves for post-liquefaction analyses. This paper …
Soil-Structure Interaction Of Soft Clay Using Prefabricated Vertical Geodrains Under Seismic Stresses,
2010
The M.S University of Baroda, India
Soil-Structure Interaction Of Soft Clay Using Prefabricated Vertical Geodrains Under Seismic Stresses, Manish V. Shah, Arvind V. Shroff
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Experimental model study was carried out on soft Kaolinite clay using modified hydraulically pressurized oedometer with vertical sandwick of different diameter using open mandrel technique to investigate consolidation characteristics based on settlement and excess pore water pressure dissipation measurements. The main aim of this paper is to know the behavior of this consolidated mass under seismic stresses for different periods of time using shaking table.Pre and post shear strength of consolidated soil mass is evaluated using vane shear apparatus under seismic stresses. The interaction phenomena between clay and sandwick drain is also studied in oedometer to know stability of vertical …
Design Of Bridges Against Seismic Faulting : Methodology And Applications,
2010
National Technical University of Athens, Greece
Design Of Bridges Against Seismic Faulting : Methodology And Applications, Ioannis Anastasopoulos, Takis Georgarakos, Rallis Kourkoulis, George Gazetas
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper presents a methodology for design of bridge–foundation systems against seismic faulting. The problem is decoupled in two steps. Step 1 deals with the response of a single bridge pier and its foundation subjected to faulting–induced deformation ; Step 2 deals with the detailed model of the superstructure, which is subjected to differential displacements computed in Step 1. We analyze typical viaduct and underpass bridges, founded on piles or caisson foundations. Piled foundations are found to be vulnerable to faulting– induced deformation. While end–bearing piles cannot really sustain any appreciable bedrock offset, floating piles may perform better, especially if …
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 …
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 …
Seismic Fragility Analysis For Sheet Pile Wharves — Case Study Of The Hualien Harbor In Taiwan,
2010
National Center for Research on Earthquake Engineering, Taiwan
Seismic Fragility Analysis For Sheet Pile Wharves — Case Study Of The Hualien Harbor In Taiwan, Yung-Yen Ko, Ho-Hsiung Yang, Cheng-Hsing Chen
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The seismic fragility curves represent the conditional probabilities that the structural damage meets or exceeds the specified damage states at various levels of the ground motion parameters, such as peak ground acceleration (PGA). In this study, the seismic fragility analysis for the sheet pile wharves of the Hualien Harbor in Taiwan was performed. The finite element analysis software PLAXIS was adopted for the nonlinear dynamic analysis. The time histories of several representative earthquake events that actually occurred in Taiwan, including the 1999 Chi-Chi Earthquake, were scaled to various PGA levels as the input motions. Then the seismic responses of the …
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) …
Evaluating Seismicity Parameters Of Sanandaj, Iran Based On Instrumental Earthquakes,
2010
University of Kurdistan, Iran
Evaluating Seismicity Parameters Of Sanandaj, Iran Based On Instrumental Earthquakes, Kaveh Andisheh, Gholamreza Ghodrati Amiri, Motaza Taghizadeh
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The main goal of this paper is to evaluate the seismic parameters of Sanandaj, Iran. For this reason, at first, all the occurred instrumental earthquakes (1900-2006) in a radius of 200 km of Sanandaj city have been gathered. After elimination of the aftershocks and foreshocks, the main earthquakes were taken into consideration to calculate the seismic parameters by Gutenberg-Richter method, cumulative distribution functions, and Kijko-Sellevoll approach. This paper aims at estimation of seismicity parameters based on the seismic events and the relation between the cumulative frequency of earthquake occurrence and its magnitude. For this purpose the variable windows in time …
Uniform Seismic Hazard Spectra Of Sanandaj, Iran,
2010
University of Kurdistan, Iran
Uniform Seismic Hazard Spectra Of Sanandaj, Iran, Kaveh Andisheh, Gholamreza Ghodrati Amiri, Seyed Ali Razavian Amrei
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper presents uniform seismic hazard spectra of Sanandaj city of Iran. Sanandaj is the administrative center of Kurdistan province, in which more than 500,000 people live in. A collected catalogue, containing both historical and instrumental events and covering the period from the 10th century BC to the year 2006, is used. Then seismic sources and The seismotectonic model of the considered region have been modeled within the radius of 200 km and recurrence relationship is established. After elimination of the aftershocks and foreshocks, the main earthquakes were taken into consideration to calculate the seismic parameters. For this purpose the …
Earthquake Induced Excess Pore Water Pressures In The Upper San Fernando Dam During The 1971 San Fernando Earthquake,
2010
Golder Associates Ltd., Canada
Earthquake Induced Excess Pore Water Pressures In The Upper San Fernando Dam During The 1971 San Fernando Earthquake, Abouzar Sadrekarimi, Timothy D. Stark
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The excess pore water pressure developed in the Upper San Fernando Dam during the 1971 San Fernando Earthquake has been evaluated in several studies. Almost all of these studies indicate large excess pore pressure ratios developed only in the upstream and downstream shells which are not consistent with the limited deformation of the dam and the piezometer responses during the earthquake. In this paper, the construction and field observations of the behavior of the Upper San Fernando Dam are reviewed and a simple approach involving Newmark’s (1965) and Makdisi-Seed’s (1978) permanent deformation and limit equilibrium slope stability analyses are used …
Vibro Replacement For Liquefaction Hazard Mitigation For Operational Storage Facility In Coronado, California, Usa,
2010
Hayward Baker Inc., Escondido, CA
Vibro Replacement For Liquefaction Hazard Mitigation For Operational Storage Facility In Coronado, California, Usa, Sunil Arora, Lisheng Shao
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Vibro replacement stone columns were installed for soil improvement for the construction of a 20,000-square-foot operational storage facility in Coronado, CA. The soil improvement program was conducted to meet seismic and static performance criteria for spread footings founded on improved soil. CPT testing was conducted before and after stone column construction to verify the vibro replacement program. Comparison between pre- and post-construction CPTs showed remarkable increase in the tip resistance in loose sand layers. Accounting for densification and shear reinforcement, the anticipated post-improvement liquefaction-induced settlement was reduced significantly.
Dynamic Earth Pressures And Earth Pressure Cell Measurements,
2010
Arup, London, U.K.
Dynamic Earth Pressures And Earth Pressure Cell Measurements, Yasir Ramzan Khokher, Gopal Madabhushi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Retaining Wall failures have frequently occurred during seismic events and have therefore been the subject of much research. The pseudo-static force designs, based on the Mononobe-Okabe earth pressure coefficient equations, have been adopted by most current design codes due to its simplicity and ease of use. However, it is clear that there are limitations attached with this approach and more research is required into how the earth pressures develop during seismic events. This paper investigates the seismic behaviour of sheet pile retaining walls using centrifuge testing facilities. In addition to using bending moment strain gauges on the wall, new generation …
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 …
Shaking Table Methodology And Instrumentation For Reinforced Soil Retaining Walls,
2010
GeoEngineering Centre at Queen’s-RMC, Kingston, Canada
Shaking Table Methodology And Instrumentation For Reinforced Soil Retaining Walls, Saman Zarnani, Richard J. Bathurst, W. Andy Take
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The paper describes a testing methodology, instrumentation array and example data interpretation for reduced-scale geosynthetic reinforced soil (GRS) wall models built on a large shaking table. The testing program is unique in the literature because of the large number of different instruments deployed and the use of Particle Image Velocimetry (PIV) analysis of imagery captured using a high speed camera. The models are instrumented with strain gauges and extensometers attached to the geogrid reinforcing layers, LVDTs attached to the facing panel, load cells at the wall toe, reinforcement-facing load measurement, and accelerometers in the backfill and along the facing. Example …
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 …
Monotonic And Cyclic Behavior Of Helical Screw Piles Under Axial And Lateral Loading,
2010
Ministry of Transportation & Infrastructure, Canada
Monotonic And Cyclic Behavior Of Helical Screw Piles Under Axial And Lateral Loading, Yasser Abdelghany, M. Hesham El Naggar
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The main objectives of this research paper are to: investigate the monotonic and cyclic behavior of helical pile foundation systems, develop new helical screw systems suitable for seismic retrofitting of existing foundations and new structures. The proposed new pile configurations proposed include: fiber reinforced polymer grouted helical screw piles (FRP-G-HSP); and reinforced grouted helical screw piles (RG-HSP) with steel fibers added to the grout. The research methodology involved conducting more than one hundred full scale field load tests on twenty three helical screw piles installed in cohesive soil and subjected to axial and lateral monotonic and cyclic loading in which …
