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2010

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Articles 2161 - 2190 of 5375

Full-Text Articles in Engineering

Seismic P-Wave Polarization In The Context Of On-Site Early Warning System, Anton Zaicenco, Sharlie Huffman, Iain Weir-Jones May 2010

Seismic P-Wave Polarization In The Context Of On-Site Early Warning System, Anton Zaicenco, Sharlie Huffman, Iain Weir-Jones

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

Design of an on-site seismic early warning system for critical facilities, based on P-wave detection, requires knowledge of local seismicity, analysis of strong-motion records, and local geological settings. The scope of current paper is to present an efficient and reliable methodology for P-wave detection and discrimination. It is tolerant to the environmental, traffic and other types of noise at the location of the critical facility. The basic idea that is exploited in the proposed algorithm is the degree of P-wave polarization, which is obtained with Karhunen- Loève transform of the orthogonal triaxial records. A system consisting of borehole sensor array …

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Selection Of Ground Motion Records For Two Dam Sites In Oregon, Kenji Yamasaki, Andy Vessely, Chris Carpenter May 2010

Selection Of Ground Motion Records For Two Dam Sites In Oregon, Kenji Yamasaki, Andy Vessely, Chris Carpenter

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

Internet-based USGS’s interactive deaggregation of probabilistic seismic hazard was used to identify principal sources of earthquake hazard at two dam sites in western Oregon. The dams are located in the western margin of the Pacific Northwest region of the United States where Cascadia Subduction Zone and shallow gridded crustal earthquakes are dominant sources of earthquake hazard. For each source, the magnitude, distance, and number of standard deviations (ε) were determined to develop target acceleration response spectra using ground motion prediction equations. The selection of ε for the gridded crustal earthquakes was different for the two sites; one site is in …

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The Limitations Of Equivalent Linear Site Response Analysis Considering Soil Nonlinearity Properties, S. M. Mir Mohammad Hosseini, M. Asadolahi Pajouh, F. Mir Mohammad Hosseini May 2010

The Limitations Of Equivalent Linear Site Response Analysis Considering Soil Nonlinearity Properties, S. M. Mir Mohammad Hosseini, M. Asadolahi Pajouh, F. Mir Mohammad Hosseini

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

Seismic site effect has been a major issue in the field of earthquake engineering due to the large local amplification of the seismic motion. This paper presents the importance of an appropriate soil behavior model to simulate earthquake site response and gives a critical overview of the field of site response analysis. Some of the well known site response analysis methods are summarized and discussed. The objective of this paper is to investigate the influences of nonlinearity on the site response analysis by means of a more precise numerical model. In this respect, site responses of four different types of …

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Weak Motion Linear Soil Amplification At Aegion, Greece, And Comparison With Seismic Design Codes, Olga-Joan Ktenidou, Dimitris Raptakis, Kyriazis Pitilakis May 2010

Weak Motion Linear Soil Amplification At Aegion, Greece, And Comparison With Seismic Design Codes, Olga-Joan Ktenidou, Dimitris Raptakis, Kyriazis Pitilakis

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

We use 473 weak motion surface records from a relatively soft soil site (CORSSA) and 81 from a relatively stiff soil site (DIM) in conjunction with downhole records obtained in rock in order to study linear seismic soil amplification in Aegion, Greece. We estimate peak ‘soil-to-outcrop’ amplification factors in the time domain for the two sites through linear regression of PGA values. We view the results derived from these very weak motion records as indicative of the entire linear elastic range based on the large dataset size. We compare the peak horizontal soil amplification factors we derive from records with …

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Artificial Neural Network Model For Prediction Of Liquefaction Potential In Soil Deposits, F. Farrokhzad, A. J. Choobbasti, A. Barari May 2010

Artificial Neural Network Model For Prediction Of Liquefaction Potential In Soil Deposits, F. Farrokhzad, A. J. Choobbasti, A. Barari

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

With the increase in population, the evaluation of liquefaction is becoming more important for land use planning and development. In soil deposits under undrained condition, earthquakes induce cyclic shear stresses, may lead to soil liquefaction. Artificial neural network (ANN) is one of the, artificial intelligence (AI) approaches that can be classified as machine learning. Simplified methods have been practiced by researchers to assess nonlinear liquefaction potential of soil. In order to address the collective knowledge built up in conventional liquefaction engineering, an alternative general regression neural network model is proposed in this paper. To meet this objective, a total of …

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Cpt-Based Comparative Mapping Of Liquefaction Hazard For Large Areas, Johann Facciorusso, Marco Uzielli, Giovanni Vannucchi May 2010

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 …

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Earthquake Induced Liquefaction Using Shake Table Test, S. R. Pathak, R. S. Dalvi, A. D. Katdare May 2010

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 …

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Estimation Of Seismic Compression In Dry Soils Using The Cpt, P. K. Robertson, Lisheng Shao May 2010

Estimation Of Seismic Compression In Dry Soils Using The Cpt, P. K. Robertson, Lisheng Shao

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

A popular method to evaluate earthquake induced settlements in dry sands is the approach proposed by Pradel (1998) which was based on standard penetration test (SPT) results and is only applicable to clean sands. A simple modification of the Pradel (1998) method is proposed based on cone penetration test (CPT) results and is extended to cover a wide range of unsaturated soils. A key parameter in the method by Pradel (1998) is the small strain shear modulus, Go, which can be estimated from the CPT or measured using the seismic CPT. The CPT can provide a continuous evaluation …

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Field Evidence And Laboratory Testing Of The Cyclic Vulnerability Of Fine-Grained Soils During The 1999 Kocaeli Earthquake, C. Guney Olgun, James R. Martin Ii, Atila Sezen May 2010

Field Evidence And Laboratory Testing Of The Cyclic Vulnerability Of Fine-Grained Soils During The 1999 Kocaeli Earthquake, C. Guney Olgun, James R. Martin Ii, Atila Sezen

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

Significant earthquake-induced settlements occurred in saturated fine-grained soils at the Carrefour Shopping Center in Turkey during the 1999 Kocaeli Earthquake (M=7.4). Most of the settlement was due to the undrained cyclic failure of silt/clay (ML/CL) and highplasticity clay (CH) strata within the subsoil profile. Each suffered about 1% vertical strain. Extensive laboratory testing on undisturbed samples from these silty and clayey strata has been performed to investigate this behavior. The laboratory testing included monotonic and cyclic simple shear tests, triaxial tests and conventional 1-D consolidation tests. Considerable pore pressure increases have been measured during cyclic simple shear test which was …

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Seismotectonic Contours Of Kashmir-Hazara Region And Seismological Aspects Of October 08, 2005 Earthquake, Syed Kazim Mahdi May 2010

Seismotectonic Contours Of Kashmir-Hazara Region And Seismological Aspects Of October 08, 2005 Earthquake, Syed Kazim Mahdi

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

During the wee hours of October 08, 2005, a devastating shallow focused (16.2 km) earthquake with moment magnitude of Mw 7.7 occurred in the Pakistan’s Kashmir Hazara Region. Its tremors were felt in a radius of over 1000 km with damages taking place in an area of 36000 sq km. More than 0.1 million people died and the rehabilitation of infrastructures damages are estimated to cost around five billion dollars. The Kashmir Hazara terrain is located on the NW margin of lesser Himalaya. The KHS is one of the bold tectonic scars which physically isolate this terrain from rest of …

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Static Load Induced Liquefaction, Steels Corners Road Embankment Failure, Mitchell W. Weber, Alexandre J. Bredikhin May 2010

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 …

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2d Fem Analysis Of Earth And Rockfill Dams Under Seismic Condition, Prabir K. Basudhar, N.S.V. Kameswara Rao, M. Bhookya, Arindam Dey May 2010

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 …

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An Empirical Predictive Relationship For Assessing The Seismic Stability Of Slopes, Jongwon Lee, Russell A. Green, Rachel Finch May 2010

An Empirical Predictive Relationship For Assessing The Seismic Stability Of Slopes, Jongwon Lee, Russell A. Green, Rachel Finch

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

The objective of the study presented herein is to develop an empirical predictive relationship for permanent relative displacements for use in assessing the seismic stability of slopes, dams, and/or embankments subjected to active shallow crustal earthquake motions. A total of 330 horizontal motions, recorded at rock sites during 29 earthquakes in active shallow crustal regions (e.g., western North America: WNA), were used in this study. For each motion, the permanent relative displacements were computed using the Newmark sliding block procedure for a suite of yield-accelerations: 0.01, 0.05, 0.10, and 0.20 g. The predictive relationship proposed herein was derived by performing …

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Effect Of Canyon Geometry And Ground Conditions On The Seismic Performance Of Tendaho Earthfill Dam In Ethiopia., Tensay G. Berhe, Wu Wei May 2010

Effect Of Canyon Geometry And Ground Conditions On The Seismic Performance Of Tendaho Earthfill Dam In Ethiopia., Tensay G. Berhe, Wu Wei

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

The seismic performance of earth dams is usually studied by two dimensional (2D) space. However, considerable judgment is required to estimate the overall three dimensional dynamic response of dams in a narrow canyon from plane strain analyses of individual sections of the dam. This is so because the plane strain analysis normally ignores the arching effect of the valley which is particularly relevant for dams in narrow valleys. Because of the arching action, the effect of the canyon geometry on the dynamic response of earth dams will be a stiffening of the system. The effect of the canyon geometry is …

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Seismic Slope Stability Of Reactivated Landslides — A Performance Based Analysis, Binod Tiwari, Michael Hillman, Keyur Ajmera, Beena Ajmera May 2010

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 …

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The Effects Of Canyon Topography On Dynamic Stress Distribution In Earth Dams, Maryam Malekian, Amirata Taghavi, Mohammad Hassan Baziar, Shirin Salemi May 2010

The Effects Of Canyon Topography On Dynamic Stress Distribution In Earth Dams, Maryam Malekian, Amirata Taghavi, Mohammad Hassan Baziar, Shirin Salemi

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

Limitations of computer storage capacity and high costs have generally restricted the use of numerical methods to two-dimensional dynamic analyses of earth dams. However, differences in canyon topographies in which the earth dams have been built may cause various constraining effects. Comparison between results of plane strain and three-dimensional dynamic analyses may reflect the site effects especially in narrow canyons. Consequently, considering the geometry of canyon, one may choose an appropriate method of dynamic analysis. This paper presents the effect of different canyon geometries on amount and distribution of induced dynamic stresses in plane strain and in three-dimensional analyses. These …

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Analytical Method For Seismic Bearing Capacity Of Stone-Column Reinforced Shallow Foundations, Javad Nazari Afshar, Mahmoud Ghazavi, Khashayar Hemmati May 2010

Analytical Method For Seismic Bearing Capacity Of Stone-Column Reinforced Shallow Foundations, Javad Nazari Afshar, Mahmoud Ghazavi, Khashayar Hemmati

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

Stone-columns is a useful method for increasing bearing capacity and reducing settlement of foundation soil subjected to structure loading. For stone-column construction, 15 to 35 percent of weak soil volume is usually replaced with stone-column material. Such columns may be constructed with various diameters, lengths, and center-to-center distances. This paper presents a simple method to determine the seismic bearing capacity of stone-column reinforced shallow foundation. For this purpose, a simple failure surface is assumed to characterize the failure stage of the stone column and soil materials using the concept of lateral active and passive earth pressures. The well known Mononobe-Okabe …

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Computational Modeling Of A Large Pile Group Under Lateral Load, Jinchi Lu, Ahmed Elgamal, Charles Sikorsky, Thomas Shantz May 2010

Computational Modeling Of A Large Pile Group Under Lateral Load, Jinchi Lu, Ahmed Elgamal, Charles Sikorsky, Thomas Shantz

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

The lateral load resistance of pile foundations is critically important to the design of structures that may be subjected to earthquakes. This paper presents computational modeling results of the response of a large pile group system under lateral load. The open-source platform OpenSees is employed to conduct a nonlinear 3-dimensional finite element analysis. The piles are modeled by beam-column elements, and rigid beam-column elements are used to model the pile size (diameter). In order to facilitate the pre- and post-processing phases, a recently developed user interface OpenSeesPL is employed. Distribution of load within the pile group is presented and the …

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Dynamic Response Of Pile Groups Embedded In Transversely Isotropic Media Using Hybrid Numerical Method, B. Ghadimi May 2010

Dynamic Response Of Pile Groups Embedded In Transversely Isotropic Media Using Hybrid Numerical Method, B. Ghadimi

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

In this paper, the dynamic response of pile groups embedded in 3-D homogeneous transversely isotropic media subjected to time-harmonic vertical and horizontal loading is investigated. The response of pile groups is calculated by a novel method. This method is less complicated than boundary elements method (BEM) used in the most previous studies in this field. In the method the pile groups is discretized to some beam-column elements and radiation discs. The radiation discs represent the propagation of wave from piles to the unbounded soil medium. By calculating the dynamic stiffness of radiation discs and setting with beam-column elements, the dynamic …

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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 May 2010

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 …

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Effects Of Recorded Free-Field Motion On The Response Of Buildings Considering Soil-Structure Interaction Effects, Fereidoun Amini, Masoud Shadlou May 2010

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 …

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Experimental Soil - Foundation - Bridge Pier Interaction : Towards A Reversal Of Capacity Design, Ioannis Anastasopoulos, Takis Georgarakos, Vasilis Drosos, George Gazetas May 2010

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. …

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Investigation Of Non-Uniform Pile Behaviour Under Torsional Harmonic Vibration, M. Ghazavi, M. Afzalirad May 2010

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 …

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Investigation Of Vibration Caused By Traffic And Railway Load, Hadži-Niković D. Gordana, Ćorić B. Stanko May 2010

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 …

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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 May 2010

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 …

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Seismic Behavior Of Batter Pile Foundation: Kinematic Response, Takashi Tazoh, Masayoshi Sato, Jiho Jang, Yoichi Taji, George Gazetas May 2010

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.

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Seismic Soil-Pile Interaction: Physical Processes And Analytical Models, Sanjeev Malhotra May 2010

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 …

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Soil-Structure Interaction Of Soft Clay Using Prefabricated Vertical Geodrains Under Seismic Stresses, Manish V. Shah, Arvind V. Shroff May 2010

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 …

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Design Of Bridges Against Seismic Faulting : Methodology And Applications, Ioannis Anastasopoulos, Takis Georgarakos, Rallis Kourkoulis, George Gazetas May 2010

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 …

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Diaphragm Walls Seismic Design According To The Eurocodes, José Matos E Silva May 2010

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 …

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