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Articles 32431 - 32460 of 40025
Full-Text Articles in Engineering
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 Ix: Geotechnical Analysis Of Recent Earthquakes, Walter W. Hays, C. Rojahn, A. Ansal
General Report —Session Ix: Geotechnical Analysis Of Recent Earthquakes, Walter W. Hays, C. Rojahn, A. Ansal
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 Xi: Engineering Vibrations And Solutions, K. Rainer Massarsch, C. Madshus, A. Bodare
General Report — Session Xi: Engineering Vibrations And Solutions, K. Rainer Massarsch, C. Madshus, A. Bodare
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.
Disclaimer, Multiple Authors
Disclaimer, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Proceedings, Shamsher Prakash
Proceedings, Shamsher Prakash
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Table Of Contents, Multiple Authors
Table Of Contents, Multiple Authors
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.
Conference Photos, Multiple People
Conference Photos, Multiple People
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Concluding Session, Shamsher Prakash
Concluding Session, Shamsher Prakash
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.
Simple Shear Versus Direct Shear Tests On Interfaces During Cyclic Loading, K. Fakharian, E. Evgin
Simple Shear Versus Direct Shear Tests On Interfaces During Cyclic Loading, K. Fakharian, E. Evgin
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
An apparatus capable of direct shear type and simple shear type testing of interfaces between soil and structural materials is developed. A series of monotonic and cyclic tests are conducted at the interfaces between dry sand and a rough surface under constant normal stress conditions with both methods. The test results indicate that the peak and residual shear strengths obtained from direct shear and simple shear are approximately the same. However, the simple shear box permits separate measurements of shear deformation of the sand mass and also sliding at the contact surface.
High Strain Rate Testing Of Unsaturated Sands Using A Split-Hopkinson Pressure Bar, G. E. Veyera, C. A. Ross
High Strain Rate Testing Of Unsaturated Sands Using A Split-Hopkinson Pressure Bar, G. E. Veyera, C. A. Ross
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
High strain rate tests were conducted on specimens of three different sands at saturations varying from dry to 100% using a Split-Hopkinson Pressure Bar. Compacted specimens were subjected to undrained uniaxial confined compression at approximate strain rates of 1000/s and 2000/s by an approximate square wave input of 225 MPa with a pulse length of 250 µs. The stress-strain curves show an initially steep portion which appears to be strain rate independent. Beyond this, slopes are about the same up to the lock-up strain, an abrupt change in slope, indicating an increase in stiffness. The effect of increasing saturation is …
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 …
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 …
Stress Dependence Of Sand Stiffness, D. C. F. Lo Presti, M. Jamiolkowski, O. Pallara, V. Pisciotta, S. Ture
Stress Dependence Of Sand Stiffness, D. C. F. Lo Presti, M. Jamiolkowski, O. Pallara, V. Pisciotta, S. Ture
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The stress dependence of the Young's modulus of two sands was studied with a computer controlled triaxial apparatus, capable of giving reliable measurements of the stiffness even at very small strains ≈ 0.001 %. It was therefore possible to determine the Young's modulus of the sands for a wide strain range, from very small to very large, up to 20 %. The tested sands were: a uniform fine quartz sand not containing fines (Toyoura sand- TOS), and a well graded coarse to medium carbonatic, crushable sand containing about 2% of fines (Quiou sand - QS). The specimens were reconstituted in …
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 …
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. …
Verification Of An Elasto-Piastic Earthquake Analysis Procedure, A. Anandarajah
Verification Of An Elasto-Piastic Earthquake Analysis Procedure, A. Anandarajah
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
An effective stress based, finite element procedure of modeling earthquake soil and soil-structure interaction problems is described. Elasto-plastic constitutive models are used to describe the stress-strain behavior of soils. A fully-coupled finite element formulation is employed, which allows the pore pressure build-up and dissipation to be modelled simultaneously. Undrained behavior is modelled as a special case of this general formulation. In a previous study, the procedure was used to perform a “before the event” prediction of the liquefaction behavior of a 10-meter thick saturated sand deposit subjected to an earthquake loading. In the present paper, the predictions are compared with …
Dynamic Properties Of A Granular Soil, F. Rodriguez-Roa, G. Palma
Dynamic Properties Of A Granular Soil, F. Rodriguez-Roa, G. Palma
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The variation of the Dynamic Shear Modulus, G, and Damping Ratio, D, in a coarse grained alluvial soil from the Santiago area, Chile, is analyzed when changes occur in its grain size distribution, degree of compaction, confining pressure, magnitude of the cyclic deviator stress, and number of applied loading loops. Using statistical techniques it was possible to determine the degree of influence of each one of such factors in the magnitude of G and D. Further, the experimental error derived from laboratory tests measurements could be evaluated. The Hyperbolic Model shows a better performance than the Ramber-Osgood Model when theoretical …
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 …
Soil-Pile-Structure During Liquefaction On Centrifuge, Masayoshi Sato, Yasuhiro Shamoto, Jian-Min Zhang
Soil-Pile-Structure During Liquefaction On Centrifuge, Masayoshi Sato, Yasuhiro Shamoto, Jian-Min Zhang
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Larger scale dynamic centrifuge modeling has been used to examine the behavior of a soilpile-structure system during earthquake-induced liquefaction. The model consisting of a 3 x 3-pile supported structure and a saturated sand deposit was constructed in a laminar container with the inside dimensions of 74-cm length, 50-cm height and 34-cm width. Test results show that liquefaction occurred only within a finite zone in the saturated sand deposit subjected to a strong input shaking that corresponds to a maximum earthquake acceleration of 0.3 g induced probably in actual ground, which agrees well with the results of earthquake damage investigation; moreover, …
Preliminary Investigation Of A Buried Pipe Excited By An Earthquake, Hubert K. Law, Hon-Yim Ko, Jun Tohda, Liming Li, Takeshi Hamada
Preliminary Investigation Of A Buried Pipe Excited By An Earthquake, Hubert K. Law, Hon-Yim Ko, Jun Tohda, Liming Li, Takeshi Hamada
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The consequence of a devastating earthquake is usually a result of fires, which are caused by breakage of gas pipelines and lack of water supply from damaged water pipelines. The seismic response of a buried pipe was studied using the geotechnical centrifuge facility at the University of Colorado, Boulder. Ottawa sand labeled F-75 was used to model the ground, which was contaminated in a rigid container with inside dimensions of 48 in. long, 12 in. wide and 9 in. deep. A 4-foot long micro PVC pipe having a 1/4-inch-inside diameter and a 5/16-inch-outsIde diameter was used to model a prototype …
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, …