Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Keyword
-
- Dynamic analysis (2)
- Soil-pile-structure interaction (2)
- Analysis (1)
- Coupling (1)
- Damping (1)
-
- Dynamic stiffness (1)
- Earthquake (1)
- Explosions (1)
- Flexibility (1)
- Foundation (1)
- Foundations (1)
- Ground motion (1)
- Impedance (1)
- Inertial force (1)
- Inhomogeneity (1)
- Laminar shear box (1)
- Lava flows (1)
- Liquefaction (1)
- Magmas (1)
- Natural period (1)
- Pile (1)
- Pile foundations (1)
- Pressure (1)
- Shaking table test (1)
- Soil-structure interaction (1)
- Spectrum ratio (1)
- Stiffness (1)
- Structural design. (1)
- Subgrade reaction (1)
- Table top structure (1)
- Publication
- Publication Type
Articles 271 - 300 of 358
Full-Text Articles in Geotechnical Engineering
Natural Frequency Of Vertical Foundation Vibrations Evaluated From In-Situ Impact Test, Mark R. Svinkin
Natural Frequency Of Vertical Foundation Vibrations Evaluated From In-Situ Impact Test, Mark R. Svinkin
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Local soil conditions play an important part in development of ground vibrations from machine foundations. A soil profile predominantly effects the natural frequencies of foundation vibrations. This paper presents a method for obtaining a pre-construction estimation of the natural frequency of damped vertical vibrations of foundations which will be built at a specific site for machines with dynamic loads. The method pertains principally to the relationship between foundation frequencies and the natural frequencies of the soil profiles at construction sites.
Proposal On Non-Linear Response Analysis Method In Frequency, Susumu Nakamura, Nozomu Yoshida
Proposal On Non-Linear Response Analysis Method In Frequency, Susumu Nakamura, Nozomu Yoshida
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The objective of this report is to propose a non-linear response analysis method in frequency domain based on the stress and strain relationship of soil in frequency domain. First of all, a new model for the strain and frequency dependent characteristics between shear modulus and damping constant with respect to the complex shear modulus is proposed, considering the following two characteristics; One is the similarity of stress-strain relationship between time domain and frequency domain. The other one is a non-stationary characteristics in frequency domain caused by non-linearity of soil. A new non-linear dynamic response analysis method in frequency domain is …
Numerical Simulation Of Active Fault Rupture Propagation Through Dry Soil, Dimitrios N. Loukidis, George Bouckovalas
Numerical Simulation Of Active Fault Rupture Propagation Through Dry Soil, Dimitrios N. Loukidis, George Bouckovalas
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Numerical simulation of fault rupture propagation through dry soil was performed using the finite difference code FLAC. A Mohr-Coulomb elasto-plastic constitutive model with strain softening was used to simulate soil behavior. The bedrock motion, prescribed at the bottom boundary of the mesh, was based on relevant seismological theories and observations. A total of 42 parametric analyses were performed where the shear strain rate and the plastic shear strain contours were used for localizing the rupture propagation as a shear band. Parametric analyses show that results are sensitive to the assumed soil type and dilatancy angle, but not to the soil …
Probabilistic Microzonation Of Urban Territories: A Case Of The Taipei City, Vladimir Sokolov, Chin-Hsuing Loh, Kuo-Liang Wen
Probabilistic Microzonation Of Urban Territories: A Case Of The Taipei City, Vladimir Sokolov, Chin-Hsuing Loh, Kuo-Liang Wen
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
An integrated approach for evaluating “site-dependent” seismic hazard in terms of ground-motion parameters, which are used for engineering purposes, is presented. The method is based on the probabilistic seismic hazard analysis in terms of Fourier acceleration spectra. A scheme that allows conversion of the Uniform Hazard Fourier spectra to “hazard-compatible” peak ground acceleration (PGA), and Uniform Hazard response spectra is described. The method has been applied for preliminary probabilistic microzonation of the Taipei basin (the Taipei city). The source, path and site effects are characterized separately on the basis of the analysis of large collection of ground-motion recordings obtained since …
Effect Of K0 On Liquefaction Strength Of Silty Sand, Shun-Ichi Sawada, Ryouichi Sakuraba, Naoki Ohmukai, Takeko Mikami
Effect Of K0 On Liquefaction Strength Of Silty Sand, Shun-Ichi Sawada, Ryouichi Sakuraba, Naoki Ohmukai, Takeko Mikami
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Authors measured K0-value in-situ using Self-boring lateral load tester (SBLLT) and Flat-diratometer (DMT). After that, a series of cyclic undrained torsional shear tests under the plane strain condition on anisotropically consolidated condition (K0-condition) has been performed using undisturbed tube sampling to investigate the relation between the liquefaction strength of isotropically consolidated condition (Rlisotropic) and K0-condition (RlK0). The result of these laboratory tests shows that the liquefaction strength defined as 7.5% shear strain in double amplitude of undisturbed silty sand is generally agreement between triaxial and torsional test with isotropically and …
Seismic Analysis Using Synthetic Wave Based On The Dislocation Model To Simulate Ground Motions In The Hyogoken-Nanbu Earthquake 1995, Hiroyuki Kimura, Hirokazu Takemiya
Seismic Analysis Using Synthetic Wave Based On The Dislocation Model To Simulate Ground Motions In The Hyogoken-Nanbu Earthquake 1995, Hiroyuki Kimura, Hirokazu Takemiya
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The Green function based on the kinematics dislocation model has been newly developed in association with the convolution scheme in time for source function and in space along rupture direction. Synthetic waves derived from this model are corresponding to the bedrock motion. The ground model is formed with 3D multi-thin layers and the soils are linear material. Inhomogeneous rupture mechanism in faults is considered in terms of multiple asperities gained from the inversion information. In the shallow soils, non-linearity governs the dynamic behavior of the ground. Waves propagate with amplifications and absorption through the soft soil according to the frequency …
Local Site Effects Of Transient Dynamic Characteristics Of Irregularly Layered Grounds, Takashi Akiyoshi, Kunihiko Fuchida, Shozo Shirinashihama
Local Site Effects Of Transient Dynamic Characteristics Of Irregularly Layered Grounds, Takashi Akiyoshi, Kunihiko Fuchida, Shozo Shirinashihama
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
To explain the heavily damaged area for Kobe earthquake in 1995, nonlinear response characteristics of 2D irregularly reclaimed soil layers of saturated and unsaturated soil are investigated by using the existing FE program for effective stress analysis. For numerical computations, a typical Kobe ground model and a reference ground model with the absorbing boundary conditions are used. In order to understand the local transient characteristics of grounds due to liquefaction, the time-dependent fundamental natural period are investigated as a key parameter. Main conclusions are that liquefaction changes the dynamic characteristics of the sites into the transient high-cut filters and also …
Compressional And Shear Waves Tests Through Upper Sheet Of Low Angle Thrust Fault, Ronald C. Chaney, David N. Lindberg, Jim Cooksley Jr., Frank Bickner, Gary L. Manhart, David Gervan
Compressional And Shear Waves Tests Through Upper Sheet Of Low Angle Thrust Fault, Ronald C. Chaney, David N. Lindberg, Jim Cooksley Jr., Frank Bickner, Gary L. Manhart, David Gervan
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Compressional and shear wave tests were conducted on the upper thrust sheet of the low angle Little Salmon thrust fault. The study was conducted on the campus of the College of the Redwoods. The campus is located approximately 8 miles south of Eureka and 24 miles north-northeast of Cape Mendocino and the Mendocino Triple Junction (MTJ) in Northern California. The MTJ is the point of transition from strike-slip faulting of the San Andreas transform system to low-angle reverse (thrust) faulting and folding associated with the convergent margin of the Cascadia Subduction Zone. The campus is located on the southwest limb …
Evaluation Of The Seismic Behavior On Sandy Ground With Built-Up Pore Water Pressures By Effective Stress Analysis, Jun'ichi Nishikawa, Hirochika Hayashi, Takuya Egawa, Shigeru Miwa, Takaaki Ikeda
Evaluation Of The Seismic Behavior On Sandy Ground With Built-Up Pore Water Pressures By Effective Stress Analysis, Jun'ichi Nishikawa, Hirochika Hayashi, Takuya Egawa, Shigeru Miwa, Takaaki Ikeda
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
It is important to consider the non-linear behavior of the soil in evaluating the seismic behavior of the ground during the large ground motion. Pore water pressures, in the order of 75% of the initial mean confining pressures, were observed at the liquefaction observation sites near the Lake Utonai in Hokkaido, Japan during the 1993 Kushiro-oki earthquake. In the current study, effective stress analysis and total stress non-linear analysis were carried out incorporating both strain-dependent non-linearity and non-linear built-up of pore pressures. The following conclusions were reached: (1) Seismic behavior of the ground, acceleration of the surface ground, transfer functions …
Seismic Response Of Deep Stiff Granular Soil Deposits, Lynn A. Salvati, Thomas M.-H. Lok, Juan M. Pestana
Seismic Response Of Deep Stiff Granular Soil Deposits, Lynn A. Salvati, Thomas M.-H. Lok, Juan M. Pestana
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Seismic site response analysis is of paramount importance for many problems in earthquake engineering and has been studied extensively over the last 50 years. More recently, the observed response of deep stiff soil profiles during seismic events has indicated the possibility of significant ground amplification. In this study, a new enhanced hysteretic constitutive model is used for the evaluation of dynamic site response of deep granular soil deposits. The constitutive laws are implemented in a finite element computer code, AMPLE2000. The response of two soil profiles to different earthquake records was calculated using the newly developed model implemented in AMPLE …
Site Effects Estimated From Microtremor Measurements At Selected Strong Motion Stations In Taiwan, Kohji Tokimatsu, Toru Sekiguchi
Site Effects Estimated From Microtremor Measurements At Selected Strong Motion Stations In Taiwan, Kohji Tokimatsu, Toru Sekiguchi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Microtremor measurements are conducted using arrays of sensors at six strong motion stations in Taiwan where the peak ground accelerations over 400 cm/s2 were recorded during the 1999 Chi-Chi earthquake. Shallow shear wave velocity profiles of these stations are estimated based on an inverse analysis of microtremor dispersion characteristics and H/V spectra. At Wufeng (TCU065) where building damage was the most extensive among others, a thick soft surface layer with a shear wave velocity less than or equal to about 200 m/s overlies a stiff layer with Vs greater than 400 m/s at a depth of about 30 m. …
The Crack Development Due To Liquefaction Of Sand Lenses During Earthquake Loading, S. M. Mir Mohammad Hosseini, F. Nateghi-A.
The Crack Development Due To Liquefaction Of Sand Lenses During Earthquake Loading, S. M. Mir Mohammad Hosseini, F. Nateghi-A.
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The failure of sand lenses during earthquake loadings has caused many damages to the ground and yet its mechanism has not been investigated extensively. In this paper the results of an analytical studies involving the mechanism of crack development of a sand lens due to liquefaction, are presented. A single loose and saturated sand lens embedded inside a stiff clay deposit, which will liquefy due to the earthquake loading, is modeled by finite element method. The principles of fracture mechanics were used and the soil behavior was considered as a non-linear elasto-plastic material. The computer package of NISA was used …
Predicting The Maximum And Distribution Of Displacements On Liquefaction-Induced Lateral Spreads, Alan F. Rauch, James R. Martin Ii
Predicting The Maximum And Distribution Of Displacements On Liquefaction-Induced Lateral Spreads, Alan F. Rauch, James R. Martin Ii
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Lateral spreading is the mostly horizontal movement of gently sloping ground due to liquefaction in shallow soil deposits. To assess the seismic hazards related to lateral spreading, estimates are needed of the maximum potential ground movement at these sites. One approach to this problem is to predict, using empirical models, the mean and standard deviation of the displacement magnitudes across the surface of a lateral spread. Then, using a probability density function, the maximum likely deformation at the site can be predicted with a suitable degree of conservatism. In the analysis described here, probability density functions are studied for modeling …
Spt Energy Transfer Measurements For Liquefaction Evaluations In The Northeast, Lawrence F. Johnsen, Stanley M. Bemben, Jon J. Jagello
Spt Energy Transfer Measurements For Liquefaction Evaluations In The Northeast, Lawrence F. Johnsen, Stanley M. Bemben, Jon J. Jagello
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Energy measurements were made during Standard Penetration testing at Northeast locations with 16 drilling rigs having various energy transfer mechanisms including automatic safety hammers, wire line safety hammers, rope and cathead safety hammers and donut hammers. The energy measurements were used to correct the field N values to the standard 60% reference energy transfer. Examples are provided to illustrate the significant effect which the energy transfer efficiency has when working with Building Codes. The uncertainty regarding the use of field N values as opposed to energy corrected N values when using the codes is discussed.
Experimental Study On Reduction Of The Horizontal Subgrade Reaction Due To Liquefaction, Hiroshi Kobayashi, T. Azuma, K. Tamura, T. Morimitsu, Gary L. Manhart, David Gervan
Experimental Study On Reduction Of The Horizontal Subgrade Reaction Due To Liquefaction, Hiroshi Kobayashi, T. Azuma, K. Tamura, T. Morimitsu, Gary L. Manhart, David Gervan
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
It is important to evaluate resistance strength of foundation and the subgrade reaction of soil surrounding the foundation during an earthquake when a bridge is constructed on liquefiable ground. In this study, we evaluated reduction coefficient of the horizontal subgrade reaction during liquefaction DE based on shaking table tests. We examined the influence of liquefaction resistance factor FL, subgrade shear strain amplitude and velocity of the ground on the reduction coefficient DE from the test results. We made model grounds varying relative soil density in a container, which was placed on a shaking table. A piston …
Dynamic Response Of Seabed Under Wave-Induced Loading, Maotian Luan, Dong Wang
Dynamic Response Of Seabed Under Wave-Induced Loading, Maotian Luan, Dong Wang
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In this paper, the characteristics of the development of effective stresses and pore water pressure in elastic or elasto-plastic seabed with time under a sequence of wave loading are studied by virtue of numerical finite element analyses. Compared with analytical solution for elastic problem, the numerical procedure proposed can deal with complicated situation of seabed and can predict residual pore pressure. For inelastic seabed, bounding-surface hypoplasticity model is employed to describe the nonlinear stress-strain relationship of sand under cyclic loading. The development pattern of pore pressure under undrained condition obtained from laboratory experiments is not necessary in the numerical simulation.
Cpt Evaluation Of Liquefaction Potential Using Neural Networks, Pradeep U. Kurup, Nitin K. Dudani
Cpt Evaluation Of Liquefaction Potential Using Neural Networks, Pradeep U. Kurup, Nitin K. Dudani
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The increasing popularity of the cone penetration test (CPT) for site investigations has led to several methods for predicting liquefaction potential from CPT data. This paper describes a feed-forward neural network model trained by back-propagation for predicting liquefaction potential. The model requires the following seven input variables: cone resistance, total vertical stress, effective vertical stress, earthquake magnitude, maximum horizontal acceleration at ground surface, the mean grain size D50, and the seismic shear-stress ratio. A total of ninety-six data sets from different sites around the world were used for training, and eighty-two data sets were used for testing and …
Liquefaction Studies On Silty Clays Using Cyclic Triaxial Tests, . Anubhav, N.S.V. Kameswara Rao
Liquefaction Studies On Silty Clays Using Cyclic Triaxial Tests, . Anubhav, N.S.V. Kameswara Rao
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Liquefaction of saturated soils during earthquake often had been a major cause of damage to structures. Since beginning the liquefaction studies were concentrated on sandy soils, as the sandy soils are known to be more susceptible to liquefaction. However, observations from some sites in China and Loma-Prieta earthquakes show that soils with high plastic fines are also susceptible to liquefaction. Isotropically consolidated undrained cyclic triaxial tests were conducted on undisturbed samples of silty clay soil and results of these tests are used to verify the methods based on SPT data. Slow cyclic tests were performed to investigate the development of …
The Cause Of Ground Fissures Radiating From The Footing Of A Bridge Pie Generated By The 1995 Great Hanshin Earthquake, Takashi Tazoh, Maysayoshi Sato, Hideyuki Mano
The Cause Of Ground Fissures Radiating From The Footing Of A Bridge Pie Generated By The 1995 Great Hanshin Earthquake, Takashi Tazoh, Maysayoshi Sato, Hideyuki Mano
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
After the 1995 Great Hanshin Earthquake, ground fissures were found to have radiated from the footing of a bridge pier. Simple experimental and numerical studies were carried out to investigate the cause of these fissures. This paper clarified that the ground fissures appeared not as a result of the force due to the lateral spreading of the liquefied soil acting to the back of the footing of the bridge pier, but due to the movement of the ground behind the riverbank toward the river caused by the collapse of the riverbank.
Geomorphological Criteria For Evaluating Liquefaction Potential Considering The Level-2 Ground Motion In Japan, Kazue Wakamatsu, Akio Yamamoto, Ichiro Tanaka
Geomorphological Criteria For Evaluating Liquefaction Potential Considering The Level-2 Ground Motion In Japan, Kazue Wakamatsu, Akio Yamamoto, Ichiro Tanaka
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In response to a bitter experience in the 1995 Hyogo-ken Nambu (Kobe) earthquake, the level-2 ground motion, extraordinarily strong shaking motion that would be caused by an earthquake directly under the area such as the 1995 earthquake, has been considered in seismic design of various kind of structures in Japan, in addition to the level-l general ground motion. Geomorphological criteria in the manual for zonation on liquefaction hazard issued by Land Planning Agency, which have been used a qualitative estimate of liquefaction potential were demanded to keep up with the above-mentioned trend of the time. The purpose of this study …
3-D Modeling Of Liquefaction Phenomenon Using Distinct Element Method, N. Ravichandran, Kimiro Meguro
3-D Modeling Of Liquefaction Phenomenon Using Distinct Element Method, N. Ravichandran, Kimiro Meguro
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Liquefaction is one of the most important, complex and controversial topics in geotechnical earthquake engineering. Since Niigata earthquake in 1964, it has been popularly recognized that the liquefaction induced ground failures cause severe damage to the built environment. To take measures against such damage, understanding the mechanism of liquefaction and its associated phenomena from macroscopic and microscopic viewpoints is very important. There are two approaches, which are experimental and numerical ones, to study them. Although discussion from the macroscopic viewpoints can be done by experiments, it is not so easy to perform experiment to obtain microscopic information on liquefaction and …
Liquefaction Analysis Of A Petroleum Tank-Ground-Pile Ring System In Reclaimed Ground Near Seashore, A. Yashima, F. Zhang, K. Sawada, R. Uzuoka
Liquefaction Analysis Of A Petroleum Tank-Ground-Pile Ring System In Reclaimed Ground Near Seashore, A. Yashima, F. Zhang, K. Sawada, R. Uzuoka
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In this paper, liquefaction analysis (LIQCA2D, LIQCA3D) of a petroleum tank-ground-foundation system is conducted using a dynamic finite element-finite difference method. The nonlinearity of the ground is simulated with a kinematic hardening elastoplastic model, which has been verified by a series of hollow cylindrical torsional shear tests and been proved that it can well predict the behaviors of soils such as the liquefaction strength curve, the stress-strain relation as well as the effective stress paths during cyclic loading. In the numerical analyses, an FEM-DEM analytical method is adopted to the soil-water coupled analysis. The petroleum tank is built on a …
Modeling Uncertainty In Seismic Stability And Earthquake Induced Displacement Of Earth Slopes Under Short Term Conditions, Azm S. Al-Homoud, Wisam W. Tahtamoni
Modeling Uncertainty In Seismic Stability And Earthquake Induced Displacement Of Earth Slopes Under Short Term Conditions, Azm S. Al-Homoud, Wisam W. Tahtamoni
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Different models were developed for evaluating the probabilistic three-dimensional (3-D) stability analysis of earth slopes and embankments under earthquake loading using both the safety factor and the displacement criteria of slope failure. These models are formulated and incorporated within a computer program (PTDDSSA). The probabilistic models evaluate the probability of failure under seismic loading considering the different sources of uncertainties involved in the problem. A sensitivity analysis was conducted on the different parameters involved in the developed models by applying those models to a well-known landslides (Congress Street) under different levels of seismic hazard. The hypocentral distance and earthquake magnitude …
Model Tests On Mitigation Of Liquefaction-Induced Subsidence Of Dike By Using Embedded Sheet-Pile Walls, Taka-Aki Mizutani, Ikuo Towhata
Model Tests On Mitigation Of Liquefaction-Induced Subsidence Of Dike By Using Embedded Sheet-Pile Walls, Taka-Aki Mizutani, Ikuo Towhata
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Several earthquakes in the 1990’s revealed the problem of significant subsidence of river dikes induced by subsoil liquefaction. Although soil improvement is the most reliable solution to avoid the onset of liquefaction, the substantial length of liquefaction-prone dikes together with the economical reasons does not allow this solution. It is aimed, therefore, to mitigate the subsidence to a certain extent so that a fatal flooding is avoided. The present study examines the possibility of installing sheet pile walls at toes of river dikes. Shaking table tests were conducted for this purpose and the effects of sheet pile walls were studied. …
Seismic Response Of Normally Consolidated Cohesive Soils In Gently Inclined Submerged Slopes, Giovanna Biscontin, Juan M. Pestana, Farrokh Nadim, Knut Andersen
Seismic Response Of Normally Consolidated Cohesive Soils In Gently Inclined Submerged Slopes, Giovanna Biscontin, Juan M. Pestana, Farrokh Nadim, Knut Andersen
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The geological profile of submerged slopes on the continental shelf typically includes soft cohesive soils with layer thicknesses ranging from a few meters to tens or hundreds of meters. The response of these soils in simple shear tests is largely influenced by the presence of an initial consolidation shear stress, inducing anisotropic stress-strain-strength properties which depend also on the direction of shear. In this paper, a new simplified effective-stress-based model describing the behavior of normally to lightly overconsolidated cohesive soils is used in conjunction with a one-dimensional seismic site response analysis computer code to illustrate the importance of accounting for …
Effects Of Vertical Seismic Accelerations On Slope Displacements, Armando Lucio Simonelli, Pietro Di Stefano
Effects Of Vertical Seismic Accelerations On Slope Displacements, Armando Lucio Simonelli, Pietro Di Stefano
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The behaviour of earth slopes under seismic conditions can be effectively studied by evaluating the suffered displacements, which are key parameters in the recent performance design approaches (Pianc/PTCII/WG34, 2001). Different methodologies have been developed to evaluate displacements (Whitman, 1993). Slope instabilities caused by yielding due to seismic inertial forces can be studied by methods based on the well-known model of a rigid block sliding on a plane surface (Newmark 1965). These methodologies utilise accelerometric time histories which allow to take into account the real characteristics of the seismic motion (Simonelli and Viggiani 1995). Displacement analyses are traditionally performed adopting only …
Definition Of Seismic Hazard Degree Of Dams And Their Territories, Armenia, Styopa Karapetyan, Tamara Babayan, Levon Manukyan
Definition Of Seismic Hazard Degree Of Dams And Their Territories, Armenia, Styopa Karapetyan, Tamara Babayan, Levon Manukyan
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The work is devoted to define the seismic hazard degree of four dams of Armenia: Azat, Tavshoot, Haldioom, and Joghaz. The problem required the execution of major geological-geophysical, seismological, tool and theoretical researches. Such studies of the dams in Armenia were carried out for the first time, on the complex of methods designed by us. All research was reduced to a solution of the primary problem, i.e. definition of expected maximum horizontal accelerations (EMHA) of seismic vibrations on the altitude of the investigated dams with compiling of the corresponding epyuras of the distribution of accelerations. For obtaining epyuras the values …
Seismic Stability And Rehabilitation Analysis Of A Hydraulic Fill Dam, Selami O. Tezcan, Shobha K. Bhatia, Stefan Fiegle
Seismic Stability And Rehabilitation Analysis Of A Hydraulic Fill Dam, Selami O. Tezcan, Shobha K. Bhatia, Stefan Fiegle
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper focuses on the seismic stability analysis of a hydraulic fill dam built in the mid-1920’s. The material properties of the dam were characterized using data from soil borings, standard penetration, cone penetration and shear wave velocity tests. An effective stress analysis approach was used for the analysis. A finite difference code, Fast Lagrangian Analysis of Continua (FLAG), provided static and dynamic shear stresses, excess pore water pressures, and deformations. The results obtained from the effective stress analyses are compared to the results of liquefaction potential analyses based on SPT and CPT data. For seismic excitation, a real acceleration-time …
Effects Of Ground Improvement And Armored Embankment To The Displacements Of The Seawalls And Back Fill During Earthquake, Marmoru Kanatani, Hitoshi Tochigi, Tadashi Kawai, Hiroyuki Ishikawa
Effects Of Ground Improvement And Armored Embankment To The Displacements Of The Seawalls And Back Fill During Earthquake, Marmoru Kanatani, Hitoshi Tochigi, Tadashi Kawai, Hiroyuki Ishikawa
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Large shaking table tests of the caisson type seawalls under various conditions were conducted in order to investigate the effects of the armored embankment and the improvement of sandy seabed and backfill by densification to the deformation of the seawalls during earthquake. Main results obtained from the shaking table tests were as follows : (1) Seaward horizontal displacement and tilting of the caisson were drastically reduced by the existence of the armored embankment in front of the caisson. (2) Improvement of the sandy seabed by densification method just under the rubble mound was much effective to reduction of the displacements …
Seismic Analysis Of A Partially-Buried Drinking Water Reservoir, Sri T. Srithar, Upul D. Atukorala
Seismic Analysis Of A Partially-Buried Drinking Water Reservoir, Sri T. Srithar, Upul D. Atukorala
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper describes the details of the seismic analyses undertaken to retrofit the Kersland drinking water reservoir in Vancouver, British Columbia, Canada. The reservoir has a storage capacity of about 67 million litres, measures approximately 100 m by 150 m, and is partially buried. The walls are supported by above-ground soil berms. Seismic upgrading of the reservoir required an assessment of the loads imposed on the perimeter walls of the reservoir due to the design seismic event. The problem of soil-structure and structure-fluid interaction during seismic loading is complex, and could significantly increase the lateral forces on the reservoir wall. …