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Articles 4891 - 4920 of 7866
Full-Text Articles in Civil and Environmental Engineering
General Report —Session V: Soil Structure Interaction Under Dynamic Loading, A. H. Hadjian, T. Kobori, J. E. Luco, S. A. Savidis, Alex Sy
General Report —Session V: Soil Structure Interaction Under Dynamic Loading, A. H. Hadjian, T. Kobori, J. E. Luco, S. A. Savidis, Alex Sy
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
General Report—Session Vi: Stability Of Slopes And Earth Dams Under Earthquakes, Pedro Simao Seco E Pinto, Leslie Harder, Panos C. Dakoulas, Ashok Chugh, Hiroyuki Watanabe
General Report—Session Vi: Stability Of Slopes And Earth Dams Under Earthquakes, Pedro Simao Seco E Pinto, Leslie Harder, Panos C. Dakoulas, Ashok Chugh, Hiroyuki Watanabe
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
General Report— Session Vii: Soil Amplification During Earthquakes And Microzonation, Mehmet Celebi, G. R. Saragoni
General Report— Session Vii: Soil Amplification During Earthquakes And Microzonation, Mehmet Celebi, G. R. Saragoni
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
General Report —Session Viii: Seismology: Predicting Strong Ground Motion For Design, Bagher Mohammadioun, D. M. Rosa, M. I. Todorouska, Z. P. Liao
General Report —Session Viii: Seismology: Predicting Strong Ground Motion For Design, Bagher Mohammadioun, D. M. Rosa, M. I. Todorouska, Z. P. Liao
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
General Report —Session X: Wave Propagation In Soils, J. M. Roesset, G. Sanatana, I. S. Salinero
General Report —Session X: Wave Propagation In Soils, J. M. Roesset, G. Sanatana, I. S. Salinero
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
General Report — Session Xii: Machine Foundations And Model Tests, Vijay K. Puri, Toyoaki Nogami, Amir Kaynia
General Report — Session Xii: Machine Foundations And Model Tests, Vijay K. Puri, Toyoaki Nogami, Amir Kaynia
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Committees, Multiple Members
Committees, Multiple Members
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Conference Schedule, Multiple Authors
Conference Schedule, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Welcoming Remarks, Shamsher Prakash
Welcoming Remarks, Shamsher Prakash
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
List Of Participants, Multiple Participants
List Of Participants, Multiple Participants
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Three-Dimensional Cyclic Behaviour Of Interfaces, E. Evgin, K. Fakharian
Three-Dimensional Cyclic Behaviour Of Interfaces, E. Evgin, K. Fakharian
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A new apparatus is used to study the behavior of an interface between dry sand and a rough surface under three dimensional cyclic loading conditions. A simple shear type of soil container is utilized in the experiments to investigate the coupling effects of two orthogonal shear stresses acting on the interface. The significance of the results are discussed with reference to the behavior of axially-laterally loaded piles.
Dynamic Characteristics Of Comares Palace In The Alhambra, V. Cuellar, E. Kausel, J. L. Monte, J. M. Roesset, J. Valerio
Dynamic Characteristics Of Comares Palace In The Alhambra, V. Cuellar, E. Kausel, J. L. Monte, J. M. Roesset, J. Valerio
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper describes the geotechnical investigations that have been conducted to characterize the static and dynamic properties of the ground, the foundation and the structure's material of the Comares tower in the Alhambra palace. The Gmax values of the different materials were determined using seismic refraction, P-wave transmission tomography, cross-hole and down-hole tests. To obtain the variation of the shear moduli with strain amplitude surface wave and cyclic horizontal plate loading tests were performed in several trenches excavated in the immediate neighborhood. The analysis of the structure response to M = 5 earthquakes recently recorded at the top and …
Modelling Of Cyclic Behavior Of Sand In Large Range Of Strain Amplitudes, P. Y. Hicher, M. Kordjani
Modelling Of Cyclic Behavior Of Sand In Large Range Of Strain Amplitudes, P. Y. Hicher, M. Kordjani
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The aim of this paper is to show that it is possible to model the behavior of soils in a large range of strains (10-6 to 10-1), using an elastoplastic law with a unique set of parameters. A multimechanism law with a kinematic hardening was used to model the monotonous and cyclic behavior of sand.
Cyclic Testing Of Aggregates For Pavement Design, M. M. Zaman, Dar-Hao Chen, J. G. Laguros
Cyclic Testing Of Aggregates For Pavement Design, M. M. Zaman, Dar-Hao Chen, J. G. Laguros
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Two most commonly encountered aggregates that are used as subbases/bases of roadways in Oklahoma were selected and tested under cyclic loading to evaluate their Resilient Modulus (RM). Following the repeated triaxial RM testing, the specimens were subjected to the triaxial compression tests from which the parameters of cohesion (C), and friction angle (Φ) were obtained. A good statistical correlation was established between RM and C and Φ. The repeated triaxial RM testing procedure serves as a “conditioning” prior to the static triaxial compression and it simulates the loads imposed by the moving vehicle. The effects of conditioning on C and …
Nonlinear Cyclic Stress-Strain Relations Of Soils, K. Nakagawa, K. Soga
Nonlinear Cyclic Stress-Strain Relations Of Soils, K. Nakagawa, K. Soga
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A cyclic torsional shear testing system was developed to measure the dynamic properties of soils at a wide range of strain levels (10-4 ~ 1%). Use of proximity transducer and pneumatic actuator in a closed loop system enabled us to measure the deformation at very small strains. A new simple nonlinear model of G/Gmax = 1/(α+γβ) agreed well with the test results of various geologic materials. In this model, parameter a represents the strain at which the stiffness starts to decrease, and parameter α controls the rate of the stiffness degradation. Loose sands had larger α …
Subsequent Consolidation Of Clay Subjected To Undrained Cyclic Loading, Tej B. S. Pradhan, G. Imai, Y. Ueno, T. K. Dam
Subsequent Consolidation Of Clay Subjected To Undrained Cyclic Loading, Tej B. S. Pradhan, G. Imai, Y. Ueno, T. K. Dam
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper is mainly focused on two parts: (a) to clarify the mechanism of migration of excess pore water pressure in clay specimen and (b) subsequent consolidation behavior after the dissipation of excess pore water pressure accumulated due to undrained cyclic loading. A new technique to measure the pore pressure at the mid-height periphery of a triaxial specimen was developed. The effect of loading frequency and the stress level on the generation of excess pore pressure at the top, bottom and at mid-height of the specimen has been discussed. The variation of recompression index due to the dissipation of excess …
Random Displacement Modulus And Damping Determination, R. C. Chaney
Random Displacement Modulus And Damping Determination, R. C. Chaney
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Modulus and damping values were determined for both undisturbed and remolded silty sand specimens by cyclic triaxial methods utilizing both sinusoidal and random displacement stroke control. Remolded specimens were prepared at 3 different dry unit weights using a preparation technique that gave the same formation factor as the undisturbed specimen. Results indicated that the random displacement method tends to produce results which are similar to those obtained by the sinusoidal procedure at shearing strain levels less than 10-1 %. At shearing strain levels greater than 10-1 % the random displacement method gives lower modulus and higher damping ratio …
A New Method For Determining The Anisotropic Parameters Of Materials Under True Triaxial Cyclic Loading, Q. J. Yang, B. Shackel
A New Method For Determining The Anisotropic Parameters Of Materials Under True Triaxial Cyclic Loading, Q. J. Yang, B. Shackel
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In this paper a new approach to solving the basic equations of elastic cross-anisotropic stress and strain relationships is presented. The uniqueness of the equations is demonstrated and the conditions for their use are easily controlled in the true triaxial test equipment available in the laboratory. By this approximate solution the four anisotropic parameters of cross-anisotropic materials can be obtained. In addition, so-called fuzzy logic weighting factors are introduced to assess the differences among the observed principal deformations of samples tested. A computer program ANISOLV has been written to calculate the formulated parameters. Some typical examples are given to demonstrate …
Preshearing Effect On Effective Stress Paths, Q. J. Yang
Preshearing Effect On Effective Stress Paths, Q. J. Yang
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper presents a brief summary of the triaxial single and multi-level loading test technique to model the soils experiencing wind and/or wave kinds of load. Some important findings regarding the shear strength and pore pressure phenomenon in the repeated triaxial experiments are given. The method describing the stress path under single- and multi-level repeated stresses is established in detail. Based on a large number of the test results, some typical stress paths are presented m the effective deviation and normal stress space. The stress paths under single repeated stress at different effective ambient pressures have the same pattern and …
Changes Of Yield Stress Of Sand During Undrained Cyclic Loading, Y. Tanaka, K. Shirakawa
Changes Of Yield Stress Of Sand During Undrained Cyclic Loading, Y. Tanaka, K. Shirakawa
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In this study, the yield locus of sand being subjected to several cycles of undrained loading was investigated by using the triaxial testing device capable of measuring the acoustic emission, AE, of soil. The AE measurement indicates that the undrained shear on isotropically consolidated sand changes the shape of yield locus so as to have more kinematic hardening type of yield locus. More importantly, a change occurred in the size of yield locus, and the undrained loading has reduced the size of yield locus. Subsequent undrained cyclic loadings further reduced the size of yield locus so that there were some …
Maximum Moduli Of Sands Under Various Loadings, X. J. Zhang, M. S. Aggour
Maximum Moduli Of Sands Under Various Loadings, X. J. Zhang, M. S. Aggour
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Maximum moduli are the primary parameter in the determination of wave velocities in soils. They can be evaluated from either laboratory or field testing. In general, the excitation loadings used in laboratory and field testing are different. The resonant column apparatus was used to study the effect of loading type on the maximum moduli of sands. Sinusoidal, random and impulse loading were used. Sand specimens were tested either longitudinally or torsionally with one of the three types of loading at low strain levels, and the low-amplitude moduli were measured. Maximum moduli of the specimens were obtained from the low-amplitude moduli. …
Settlements Of Breakwater On Soft Seabed Ground Under Ocean Waves, J. Zhou, K. Yasuhara
Settlements Of Breakwater On Soft Seabed Ground Under Ocean Waves, J. Zhou, K. Yasuhara
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A procedure for predicting the wave induced excess pore water pressure and residual strain of clay using the results of cyclic triaxial tests on the reconstituted Ariake clay is described. Thereafter, the results of a numerical analysis by a 2-D dynamic effective stress FEM for a breakwater on a soft clay are presented.
Earth Pressure Variations Under Cyclic Surcharges, S. M. Mir Mohammad Hosseini
Earth Pressure Variations Under Cyclic Surcharges, S. M. Mir Mohammad Hosseini
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
There are a tremendous studies in literature about the earth pressure, most of them are concentrated on the static loading conditions. The problems of earth pressure under dynamic loadings are still the case of studies. In this paper the results of an experimental studies about variations of earth pressure at rest under different vertical cyclic loadings are presented. Cubical soil samples of 15 cm dimensions were subjected to vertical cyclic stresses and induced lateral pressure behind the rigid side walls of the soil were measured accurately. A dry and uniform sand was used and the samples were prepared by the …
Soil Property Determination For A Seismic Study, Kenneth M. Berry, Thomas L. Cooling, Stephen L. Mccaskie
Soil Property Determination For A Seismic Study, Kenneth M. Berry, Thomas L. Cooling, Stephen L. Mccaskie
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Static and dynamic soil property data were needed for input into the seismic retrofit design for the I-155 Mississippi River crossing located near the center of the New Madrid Seismic Zone. Soils consisted of recent river alluvium underlain by very dense soils of the Mississippi embayment. The field investigation consisted of conventional borings, downhole geophysical tests to measure shear wave velocity, and seismic piezo-cone soundings. SPT energy measurements were made at one boring to confirm hammer energy for liquefaction evaluation. This paper summarizes the data and provides site specific correlation of shear wave velocity vs. N-value from the seismic cone …
Modeling Of Volumetric Response Of Cemented Sand Under Cyclic Loading, Krishna R. Reddy
Modeling Of Volumetric Response Of Cemented Sand Under Cyclic Loading, Krishna R. Reddy
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper first describes cyclic tests which were conducted by Iwabuchi (1986) on both uncemented and cemented sands using a true triaxial apparatus. The paper then presents a thermodynamic or endochronic model which was used to predict the volumetric behavior of uncemented and cemented sands under cyclic loading conditions. The predicted results using the thermodynamic model and the test results using the true triaxial apparatus were found to be in good agreement.
Discussions And Replies — Session I, Multiple Authors
Discussions And Replies — Session I, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Efficiency Of An Energy-Dissipating Barrier, M. P. Luong
Efficiency Of An Energy-Dissipating Barrier, M. P. Luong
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The proposed paper describes some experimental procedures, used in (a) laboratory to recognize the energy-dissipating ability of soil and (b) in centrifuge to generate in-flight stress waves propagating through a centrifugal soil mass in order to investigate the efficiency of a stress wave mitigation barrier. The screening principle of this new type of energy-dissipating barrier has been suggested by the dissipative behavior of sandy soils, evidenced by infrared vibrothermography.
The Uplift Capacity Of Anchors Embedded In Loose Sand, Adam F. Bolt, Eugeniusz Dembicki
The Uplift Capacity Of Anchors Embedded In Loose Sand, Adam F. Bolt, Eugeniusz Dembicki
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The results of scale model tests of uplift capacity of shallow and deep anchors in loose fully saturated sands are presented. The anchors were subjected to static, cyclic and post cyclic loading. The parameters tested included the effects of embedment ratio, anchor shape, relative soil density, amplitude and number of cycles, and post cyclic response to loading. The factors influencing the behavior of the anchors are discussed.
Critical Acceleration Levels For Free Standing Bridge Abutments, K. L. Fishman, R. Richards Jr., R. C. Divito
Critical Acceleration Levels For Free Standing Bridge Abutments, K. L. Fishman, R. Richards Jr., R. C. Divito
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
An analytic procedure for predicting threshold accelerations for movement of gravity wall bridge abutments due to earthquake loading is described. The method draws on previous work related to the sliding mode of failure, and a newly developed theory on seismic reduction of bearing capacity. The main contribution of this paper is to present laboratory observations verifying mode of failure and critical acceleration levels predicted by this procedure for model retaining wall bridge abutments subjected to seismic excitation on a shaking table. Three different test series were performed with different interface conditions between the wall, and the bridge deck, soil foundation, …
Behaviour Of Saturated Sand Models Under Principal Stress Axes Rotation In Shake Table Tests, Eiji Yanagisawa, Fardin Jafarzadeh
Behaviour Of Saturated Sand Models Under Principal Stress Axes Rotation In Shake Table Tests, Eiji Yanagisawa, Fardin Jafarzadeh
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
One dimensional shake table tests were performed on saturated loose or medium dense Toyoura sand models, in order to study the response of level grounds during earthquakes and the nature of generated excess pore water pressure. 12 virgin models which prepared under identical condition, were subjected to cyclic and three different irregular shear stress patterns. It is shown that there is correlation between excess pore pressure ratio and developed shear strain, independent from applied shear stress histories and density of the models. Also, the relations of accumulated shear work as well as normalized shear work, per unit volume, are considered …