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Articles 21841 - 21870 of 33681
Full-Text Articles in Entire DC Network
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 …
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 …
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, …
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 …
Numerical Modelling Of Shear Wave Propagation In Centrifuge Models, S. P. Gopal Madabhushi
Numerical Modelling Of Shear Wave Propagation In Centrifuge Models, S. P. Gopal Madabhushi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Shear modulus of a soil layer increases with the effective confining stress. This results in a reduction in the propagation velocity of shear waves as they travel from the bed rock towards the soil surface. In a centrifuge model prototype stresses and strains are recreated at homologous points. Thus the effective confining stress and hence the shear modulus will vary with depth in a centrifuge model. This results in a change in the propagation velocity of the shear waves as they travel from the base of the container towards the soil surface. This change in the propagation velocity was investigated …
Dynamic Loading Induced Settlement Of Strip Foundation On Geogrid-Reinforced Clay, Braja M. Das, Eun C. Shin, Bang-Woong Shin, Bong-Jik Lee, Ki-Taek Jung
Dynamic Loading Induced Settlement Of Strip Foundation On Geogrid-Reinforced Clay, Braja M. Das, Eun C. Shin, Bang-Woong Shin, Bong-Jik Lee, Ki-Taek Jung
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Laboratory model tests to determine the load. The variation of the maximum permanent supported by geogrid-reinforced saturated clay and subjected to a low-frequency cyclic load are presented. In conducting the test, the foundation was initially subjected to an allowable static load. The cyclic load was then super-imposed over the static permanent settlement of a surface strip foundation settlement with the intensity of the static load and the intensity of the amplitude of the cyclic load are also presented.
Discussions And Replies — Session Ii, Multiple Authors
Discussions And Replies — Session Ii, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Liquefaction Potential Evaluation For The Messina Straits Crossing By Field And Laboratory Testing, F. Pelli, K. Tokimatsu, Y. Yoshimi, E. D' Appolonia
Liquefaction Potential Evaluation For The Messina Straits Crossing By Field And Laboratory Testing, F. Pelli, K. Tokimatsu, Y. Yoshimi, E. D' Appolonia
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The method adopted for the evaluation of the soil liquefaction potential in the Messina Straits, Italy, is presented and the results are discussed. The study was carried out for the design of three submerged floating tunnels linking Sicily to the Italian mainland. The method is based on a combined approach where field measurements are used to partly re-create the original soil fabric in the specimens for cyclic laboratory tests. The method is suitable for offshore investigations where recovery of truly undisturbed samples is hardly possible. The results show that in this way a much higher resistance to liquefaction is predicted …
Predicting Seismic Liquefaction Using Neural Networks, A. T. C. Goh
Predicting Seismic Liquefaction Using Neural Networks, A. T. C. Goh
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Neural networks have emerged as a powerful computational technique for modeling nonlinear multivariate relationships. The neural network is a product of artificial intelligence research. This paper examines the feasibility of using neural networks for assessing liquefaction potential, from actual field records. The paper starts with a brief overview of the basic architecture and concepts of neural networks. The application of the neural network methodology to evaluate seismic liquefaction potential is then presented.
Area Of Compaction To Prevent Uplift By Liquefaction, Yukihisa Tanaka, Hideo Komine, Jun-Ichi Tohma, Keizo Ohtomo, Hitoshi Tochigi, Hidenori Abo, Satoyuki Fukuda
Area Of Compaction To Prevent Uplift By Liquefaction, Yukihisa Tanaka, Hideo Komine, Jun-Ichi Tohma, Keizo Ohtomo, Hitoshi Tochigi, Hidenori Abo, Satoyuki Fukuda
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In this study, shaking table tests, upper seepage flow tests and numerical analyses were conducted to determine the condition of improvement by the compaction method, including the extent of area and the density, to prevent uplift of underground pipes by liquefaction. Based on the results of these investigations, a procedure to determine the improvement conditions was proposed.
Numerical Simulations Of Soil Liquefaction Using Stochastic Input Parameters, R. Popescu, J. H. Prevost, E. H. Vanmarcke
Numerical Simulations Of Soil Liquefaction Using Stochastic Input Parameters, R. Popescu, J. H. Prevost, E. H. Vanmarcke
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The influence of spatial variability of soil properties on the results of numerical simulations of dynamically induced pore water pressure is addressed. Random media of NSPT values are generated based on in situ test results. The soil geomechanical properties are evaluated at each location, function of the NSPT values, and finite element simulations of the behavior of a horizontally layered soil subjected to seismic loading are performed. The influence of : (1) assumed distribution of the underlying random variable, (2) scale of fluctuation, and (3) finite element mesh size are discussed in terms of predicted liquefaction index and …
Seismic Design Of Landfills For Ne United States, C. Soydemir
Seismic Design Of Landfills For Ne United States, C. Soydemir
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Northeastern U.S. seismicity is briefly discussed and design earthquake is established for landfill projects in accordance with current federal regulations. Methods previously developed for embankment dams are reviewed relative to the seismic stability evaluation of solid waste landfills. Charts were developed to expedite bottom liner and cover system selection while meeting particular seismic design requirements.
River Dike Failure In Japan By Earthquakes In 1993, M. Kaneko, J. Nishikawa, Y. Sasaki, M. Nagase, K. Mamiya
River Dike Failure In Japan By Earthquakes In 1993, M. Kaneko, J. Nishikawa, Y. Sasaki, M. Nagase, K. Mamiya
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Hokkaido, Japan was attacked by earthquakes of magnitude 7.8 twice in January and July, 1993. One is the Kushiro-Oki Earthquake and the other the Hokkaido Nansei-Oki Earthquake. River dikes were severely damaged by liquefaction of sand. The former caused liquefaction of subsided dike materials and the latter caused liquefaction of sand of the foundation bed. Relations between dimensional elements of dike and peat bed and stress relaxation within dike were analyzed. Old channels recently filled with sandy materials were distinguished from pointbar zones in ancient river bed covered with silty sediment, based on degree of damage due to liquefaction. Repairing …
Estimation Of Local Site Conditions In Kushiro City Based On Array Observation Of Microtremors, Kohji Tokimatsu, Hiroshi Arai
Estimation Of Local Site Conditions In Kushiro City Based On Array Observation Of Microtremors, Kohji Tokimatsu, Hiroshi Arai
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Possible use of short-period microtremors is explored for estimating the effects of subsurface soil conditions on the ground motion characteristics. For this purpose, microtremor measurements are conducted using arrays of sensors at two strong motion stations (Kushiro Japan Meteorological Agency and Kushiro Harbor, Hokkaido, Japan), which are located nearby but on different soils. Based on the F-k spectrum analysis of microtremors, dispersion curves of Rayleigh waves for the sites are determined. The inverse analysis of these dispersion curves results in shear wave velocity profiles down to a depth of 300 m. With these profiles, the spectrum ratio of ground surface …
Elastic Wave Propagation In Inhomogeneous Media Due To Surface Shock Loading, D. S. Shridhar, V. S. Chandrasekaran
Elastic Wave Propagation In Inhomogeneous Media Due To Surface Shock Loading, D. S. Shridhar, V. S. Chandrasekaran
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Wave propagation due to shock loading on the surface of elastic inhomogeneous half-space is considered. The shock loading is applied over a circular area in the form of suddenly applied vertical and shear stress. The analysis makes use of semi-analytical finite element formulation and explicit time integration technique. Extrapolation algorithm is employed for modelling the transmitting boundaries. Details of numerical procedure adopted are given and results of typical analysis are presented and discussed.
Finite Element Method For Love Wave Dispersion In Soils, T. D. Xia, S. M. Wu
Finite Element Method For Love Wave Dispersion In Soils, T. D. Xia, S. M. Wu
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The secular equation of Love wave is conducted by using combined finite element method and semi-infinite element method (or analytical method) in this paper. The formulation of calculating displacement distributions is also generated. The soils can be more complicate than analytical method. The results indicate that the presented method is more advantageous than analytical method. Some numerical examples are employed to illustrate its applicability and corresponding accuracy.
Discussions And Replies — Session X, Multiple Authors
Discussions And Replies — Session X, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Control Of Vertical Nonlinear Vibrations Of Foundations, M. Abdel-Rohman, H. Al-Sanad
Control Of Vertical Nonlinear Vibrations Of Foundations, M. Abdel-Rohman, H. Al-Sanad
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Sandy soil behaves nonlinearly which affects on the vibration of machine foundations. In order to control the foundation response, damping can be introduced using tuned mass dampers. It is shown the foundation nonlinear vertical response using two different dynamic soil models, and the control of the response by linking linear or nonlinear tuned mass dampers to the foundation.
Performance Of Shored Earth Retaining Systems During The January 17, 1994, Northridge Earthquake, Marshall Lew, Ebrahim Simantob, Martin B. Hudson
Performance Of Shored Earth Retaining Systems During The January 17, 1994, Northridge Earthquake, Marshall Lew, Ebrahim Simantob, Martin B. Hudson
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The performance of several temporary deep shored earth retaining systems during the January 17, 1994 Northridge earthquake in Southern California is documented. These shoring systems ranged from 30 to 70 feet in depth and were subjected to severe ground motions with little deflection or distress.
Performance Of Port Facilities During The Northridge Earthquake, K. K. Muraleetharan, S. V. Jagannath, K. Arulmoli, D. A. Thiessen
Performance Of Port Facilities During The Northridge Earthquake, K. K. Muraleetharan, S. V. Jagannath, K. Arulmoli, D. A. Thiessen
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
During the January 17, 1994, Northridge earthquake, two of the Port of Los Angeles' facilities called Berths 121-126 and Pier 300 sustained moderate damage. Lateral displacement of dikes up to five inches and liquefaction of hydraulic fills were observed. Several geotechnical analyses from simplified SPT -based method to sophisticated fully-coupled analyses are presented. Observed lateral displacements are predicted reasonably well by the fully-coupled analysis procedure and an intermediate analysis procedure which incorporates some results from a fully-coupled analysis in to a simplified Newmark-type deformation analysis. The potential for higher pore pressure generation underneath the dike compared to a level ground …
Microwave Detection Optimization Of Disbond In Layered Dielectrics With Varying Thickness, Stoyan I. Ganchev, Nasser N. Qaddoumi, Emarit Ranu, R. Zoughi
Microwave Detection Optimization Of Disbond In Layered Dielectrics With Varying Thickness, Stoyan I. Ganchev, Nasser N. Qaddoumi, Emarit Ranu, R. Zoughi
Electrical and Computer Engineering Faculty Research & Creative Works
The detection sensitivity optimization of air disbond in layered dielectric composites, using an open-ended rectangular waveguide, is studied both theoretically and experimentally. The sensitivity of the disbond detection is strongly influenced by the proper choice of parameters such as the operating frequency and the layered composite geometry (conductor backed or terminated by an infinite half-space of air). The capability of optimizing the measurement system parameters to detect and estimate the thickness of a disbonded layer independent of some changes in the thickness of the dielectric coating is also demonstrated. The impact of the parameters influencing detection optimization is theoretically investigated …
Interaction Buckling Of Flange, Edge Stiffener And Web Of C-Sections In Bending, Colin A. Rogers, R. M. Schuster
Interaction Buckling Of Flange, Edge Stiffener And Web Of C-Sections In Bending, Colin A. Rogers, R. M. Schuster
CCFSS Library (1939 - present)
No abstract provided.
Vertical Resolution Of A Seismic Survey In Stratigraphic Sequences Less Than 100 M Deep In Southeastern Kansas, Richard Daniel J. Miller, Neil Lennart Anderson, Howard Randall Feldman, Evan K. Franseen
Vertical Resolution Of A Seismic Survey In Stratigraphic Sequences Less Than 100 M Deep In Southeastern Kansas, Richard Daniel J. Miller, Neil Lennart Anderson, Howard Randall Feldman, Evan K. Franseen
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
A 400-m long, 12-fold high-resolution common depth point (CDP) reflection seismic profile was acquired across shallow converging Pennsylvanian strata in the Independence area of southeastern Kansas. One of the principal objectives was to determine practical vertical resolution limits in an excellent shallow seismic-data area with borehole control. The dominant frequency of the CDP stacked data is in excess of 150 Hz based on peak-to-peak measurements. Interference phenomena observed on stacked seismic data incorporated with models derived from log and drill-hole information suggest a practical vertical resolution limit of about 7 m, or one-third of the dominant wavelength. The data suggest …
Sks Splitting Beneath Southern California, Kelly H. Liu, Paul M. Davis, Stephen S. Gao
Sks Splitting Beneath Southern California, Kelly H. Liu, Paul M. Davis, Stephen S. Gao
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
Measurements of SKS phase splitting were obtained from nineteen seismic stations in southern California. The fast polarization directions are 53° at the southern end of the Great Valley, 82 ± 8° in the western Transverse Ranges and northern Peninsular Ranges, 95 ± 4° in Mojave Desert, and 70° on San Clemente Island. The splitting time ranges from 0.8 to 1.8 seconds, which is consistent with an anisotropic layer of 100 to 200 km thick for 4% anisotropy.