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Articles 3661 - 3690 of 4582
Full-Text Articles in Engineering
A Numerical Solution Of Wave Equation For Dynamic Compaction Of Soil, K. B. Agarwal, B. Siva Ram
A Numerical Solution Of Wave Equation For Dynamic Compaction Of Soil, K. B. Agarwal, B. Siva Ram
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
It is a known fact that any disturbance at the ground surface, like the one created by vibratory, compactors or by application of blast pressure on detonation of a foamed propellant, is transmitted into ground until it is weak enough to travel deeper and farther. The ground acceleration at various points, induces compaction. The transmission of vibrations due to such surface dynamic loads are governed by the equation of motion based on Newton's second law. The equation of motion is presented in Euiler's Coordinates using tensor notation and is solved for surface displacements due to surface dynamic loads. These loads …
Analysis Of Damping In Soil As Applied To Machine Foundations, B. M. Basavanna, M. S. Nagakumar
Analysis Of Damping In Soil As Applied To Machine Foundations, B. M. Basavanna, M. S. Nagakumar
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The parameters needed for the design of machine foundations are usually evaluated from the model block resonance test conducted at a given site. Sometimes it may not be possible to attain complete resonance and the test results may be limited to the ascending part of the response. In this paper the possible effect of damping on the values of the design parameters evaluated from the ascending part of response is examined and the nature of damping which gives realistic values of design parameters is presented.
Torsional Dynamic Response Of Embedded Footings, Peiji Yu, E. B. Wylle, F. E. Richart Jr.
Torsional Dynamic Response Of Embedded Footings, Peiji Yu, E. B. Wylle, F. E. Richart Jr.
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A computer program, originally prepared to evaluate stresses and displacements below an axisymmetric surface footing subjected to torsional loadings, has been modified to accommodate embedded footings. The material surrounding the footing can be considered as elastic, nonlinear inelastic or nonlinear inelastic including slip. Layered systems can also be treated. Good agreement was obtained in comparisons with published solutions for elastic systems, as obtained by the finite element method, and by an approximate method. In particular, comparisons were made for variations at maximum amplitude of rotation and dimensionless frequency at maximum amplitude of rotation as functions of the embedment ratio. The …
Earthquake Ground Motions At Soft Soil Sites, I. M. Idriss
Earthquake Ground Motions At Soft Soil Sites, I. M. Idriss
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
General Report, Loma Prieta Earthquake Sessions, Mary Ellen Hynes
General Report, Loma Prieta Earthquake Sessions, Mary Ellen Hynes
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Performance Of Concrete Faced Earthdam To Loma Prieta Earthquake, Sukhmander Singh, Nick Pal
Performance Of Concrete Faced Earthdam To Loma Prieta Earthquake, Sukhmander Singh, Nick Pal
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
As a result of the shaking from the Loma Prieta Earthquake of 1989, the concrete lining of an earth embankment suffered cracking at numerous locations on its upstream side and developed in its bed lining, crater-like pot-holes ranging in size up to 10 ft. in diameter. Field investigation and preliminary studies indicated the differential dynamic vibrations of the earth embankment and the concrete lining to be the cause of the cracking, and the liquefaction of the underlying stratum below the bottom of the reservoir to be the cause of the pot-holes formed as a result of the pore pressure bursting …
Source, Path And Site Effects On Loma Prieta Strong Motions, P. G. Somerville, N. F. Smith
Source, Path And Site Effects On Loma Prieta Strong Motions, P. G. Somerville, N. F. Smith
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The amplitudes of strong ground motions from the Loma Prieta earthquake recorded in the San Francisco and Oakland areas exceeded the levels predicted by standard empirical attenuation relations. Preliminary analysis of accelerograms having known trigger times suggests that the elevation of ground motion amplitudes in the distance range of approximately 40 to 100 km was due to critical reflections from the base of the crust. These reflections were large and occurred at relatively close range because of the deep focal depth of the earthquake and the strong velocity gradient at the base of the crust, and were enhanced by rupture …
System Identification And Seismic Performance Evaluation Of Earth Dams, H. S. Sayed, A. M. Abdel-Ghaffar, S. F. Masri
System Identification And Seismic Performance Evaluation Of Earth Dams, H. S. Sayed, A. M. Abdel-Ghaffar, S. F. Masri
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A system identification technique is developed to provide dynamic properties of earth dams from their seismic records. The technique is utilized to assess the capabilities and limitation of analytical models in terms of dynamic nonlinear constitutive relationships as well as damping. The technique is based on the least square method using Gaussian hypothesis. Earth dams are modeled as a three-dimensional nonhomogeneous visco-elasto-plastic soil structure. The forward problem is solved using a Galerkin-Ritz formulation in which the solution is expanded using basis function, which is selected to be the eigenmodes. The spatial variation of the excitation is considered by using global …
Performance Of A Hazardous Waste And Sanitary Landfill Subjected To Loma Prieta Earthquake, Hari D. Sharma, Harish K. Goyal
Performance Of A Hazardous Waste And Sanitary Landfill Subjected To Loma Prieta Earthquake, Hari D. Sharma, Harish K. Goyal
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Loma Prieta Earthquake of October 17, 1989 caused severe damages in the San Francisco Bay Area. Field measurements made during the earthquake and analyses performed to date indicate that bedrock accelerations were amplified to 2 to 3 times in propagating through deep cohesive deposits. In view of this, the performance of a hazardous waste and sanitary landfill subjected to Loma Prieta Earthquake and founded on deep cohesive deposits was evaluated. Analyses indicate that the peak accelerations at the base of the refuse are slightly amplified in propagating through the refuse thicknesses of up to about 50 feet. For higher refuse …
Testing Of Stressed State In The Structure-Base System Under Non-Stationary Dynamic Effects, Vyacheslav K. Musaev
Testing Of Stressed State In The Structure-Base System Under Non-Stationary Dynamic Effects, Vyacheslav K. Musaev
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Some aspects of practical realization of the finite element method (FEM) are considered for solving a two-dimensional (plane) dynamic problem of the theory of elasticity and plasticity. The results of the numerical solution of some problems for dynamic effects are presented. The comparison with the results of other methods is made.
Assessment Of Liquefaction Potential And Post-Liquefaction Behavior Of Earth Structures: Developments 1981-1991, W. D. Liam Finn
Assessment Of Liquefaction Potential And Post-Liquefaction Behavior Of Earth Structures: Developments 1981-1991, W. D. Liam Finn
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Significant developments in procedures for evaluating liquefaction potential and the post-liquefaction behaviour of earth structures are reviewed for the period 1981-1991. Particular attention is paid to the re-valuation of the liquefaction induced slide in the San Fernando Dam following the 1971 earthquake. The findings of this study have had a major impact on engineering practice.
Effects Of Soil-Structure Interaction For Structures Subjected To Earthquakes, A. S. Veletsos
Effects Of Soil-Structure Interaction For Structures Subjected To Earthquakes, A. S. Veletsos
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
An extended summary is presented of a state-of-the-art report on the subject matter. The report parallels one presented at the Fourth U. S. National Conference on Earthquake Engineering, in May 1990.
Geotechnical Lessons Learned From Mexico And Other Recent Earthquakes, Emilio Rosenblueth, Efrain Ovando
Geotechnical Lessons Learned From Mexico And Other Recent Earthquakes, Emilio Rosenblueth, Efrain Ovando
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper describes the most relevant effects of the September 1985 earthquakes on Mexico City. It discusses the results of recent exploration and research on regional geology, local site conditions and site response analyses, basic soil properties, and observation of actual behavior of soil-foundation-structure systems. The paper shows the impact of these investigations upon new - building code requirements, on general design practice and on the specialist's perception of earthquake behavior of Mexico City's subsoil. Recent earthquakes recorded in and around Mexico City have contributed insight into some of the unresolved questions left after the experience of 1985. Damaging earthquakes …
Disclaimer, Shamsher Prakash
Disclaimer, Shamsher Prakash
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.
Committees, Multiple Members
Committees, Multiple Members
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Banquet Speeches And Remarks, Shamsher Prakash, Shiming Wu, Kenji Akino, John T. Park, Joseph H. Senne, Jeanne L. Senne
Banquet Speeches And Remarks, Shamsher Prakash, Shiming Wu, Kenji Akino, John T. Park, Joseph H. Senne, Jeanne L. Senne
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Index, Multiple Authors
Index, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Author And Discussion Index, Multiple Authors
Author And Discussion Index, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Errata, Multiple Authors
Errata, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
A Cyclic Shear-Volume Coupling And Pore Pressure Model For Sand, Peter M. Byrne
A Cyclic Shear-Volume Coupling And Pore Pressure Model For Sand, Peter M. Byrne
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A two parameter incremental shear-volume coupling equation is presented for sand. The equation is based upon experimental data and gives predictions that are in excellent agreement with data over a range of relative densities and stress conditions. Empirical expressions for the two parameters based on incorporated in a simple shear pore pressure element model and the predictions of the model are compared with both saturated undrained cyclic strain and cyclic load tests. It is found that, provided a threshold strain is incorporated, the model predictions are in very good agreement with the laboratory data over a wide range of stress …
A Cyclic Triaxial Facility For Loading A Silty Clay, Matthew Raybould
A Cyclic Triaxial Facility For Loading A Silty Clay, Matthew Raybould
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A digital control servo-hydraulic triaxial test facility with full data acquisition has been developed at Nottingham University as part of the UK Science and Engineering Research Council initiative in earthquake engineering. This apparatus is currently being used to investigate the response of a coarse silt contaminated by kaolin clay to cyclic stress and strain. High quality deformation data is generated by on sample instrumentation and enables the stiffness at very low strain levels to be determined accurately. This paper describes the development of the facility and presents some results of the tests carried out to date.
Cyclic Load Resistance Of Vertically Reinforced Sand Subgrades, Vijay K. Puri, James A. Chae, Braja M. Das
Cyclic Load Resistance Of Vertically Reinforced Sand Subgrades, Vijay K. Puri, James A. Chae, Braja M. Das
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper presents the results of laboratory scale model footing tests which were conducted for determining the cyclic load resistance of sand subgrades reinforced with semi-flexible vertical elements. The tests were conducted in a sandbox having a length of 91.5 cm, width 15.25 cm, and height of 61.0 cm. Steel bars 1. 58 mm in diameter were used as reinforcing elements. Tests were also conducted by using rough reinforcing elements. The test results indicate that the value of coefficient of elastic uniform compression of the footing on sand increases with the provision of vertical reinforcement in the sand subgrade. Rough …
Cyclic Non-Linear Constitutive Equations For Sands, T. Doanh
Cyclic Non-Linear Constitutive Equations For Sands, T. Doanh
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A series of triaxial cyclic tests are performed on Hostun sand; each test undergoes several two-way, strain-controlled cyclic loadings under drained conditions. The purpose of these tests is to investigate the behavior of this sand under complex loadings. This paper extends the previous works during the last years, and aims at showing that the non-linear incremental constitutive equations can describe the behavior of saturated sand subjected to various stress loadings in drained conditions.
Degradation Behavior Of Normally Consolidated Clay Under Cyclic Loading Condition, Meei-Ling Lin, Jiang-Yuan Chen
Degradation Behavior Of Normally Consolidated Clay Under Cyclic Loading Condition, Meei-Ling Lin, Jiang-Yuan Chen
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The degradation behavior of soil may become important when considering the response of soft clay under cyclic loading condition. A nonlinear model was proposed by Idriss, et al. to account for the degradation behavior based on the controlled-strain test. By adopting a numerical procedure, the data obtained in controlled-stress cyclic triaxial test can be used to find the degradation parameter defined in the nonlinear degradation model proposed by Idriss, et al. A series of consolidated-undrained controlled-stress and controlled-strain cyclic triaxial tests were performed on laboratory manufactured normally consolidated soft clay samples. The relationship between degradation parameter and strain was determined …
Session 1: Discussions And Replies, Multiple Authors
Session 1: Discussions And Replies, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Downhole Seismic Cone Analysis Using Digital Signal Processing, R. G. Campanella, W. P. Stewart
Downhole Seismic Cone Analysis Using Digital Signal Processing, R. G. Campanella, W. P. Stewart
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In-situ measurement of the dynamic characteristics of surficial soils is becoming more common in geotechnical practice for prediction of ground surface motions from earthquake excitation and to evaluate foundations for vibrating equipment. Techniques for these measurements have been under development at the University Of British Columbia (U.B.C.) since 1980. The paper discusses many practical considerations with respect to equipment (sources, receivers, trigger, etc.) and procedures that can affect the interpretation and analysis of seismic cone results. A brief review is given of the cross-over method as used at UBC to determine interval shear velocity travel times from downhole seismic cone …
Dynamic Properties Of Saturated Coal Fly Ash, Pei-Ji Yu, Wei-Qin Qin
Dynamic Properties Of Saturated Coal Fly Ash, Pei-Ji Yu, Wei-Qin Qin
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The great part of fly ash produced by thermal power plants is either sluiced or filled in disposal areas in China. The dynamic properties of fly ash are important for solving geotechnical problems relating to fly ash mass under dynamic loadings. The high temperature during combustion makes fly ash nonplastic but pozzolanic. The nonplasticity causes the dynamic properties of sluiced and just compacted fly ash to be similar to ones of silts. The pozzolanic action causes obvious aging effect for compacted fly ash, by which an aging time of 180 days may increase maximum shear modulus by 75% to 400% …
Effects Of Hysteretic Shape On Dynamic Response, Per B. Selnes, Farrokh Nadim
Effects Of Hysteretic Shape On Dynamic Response, Per B. Selnes, Farrokh Nadim
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The parameters determined in laboratory tests for use in dynamic analyses are usually the secant modulus and the area of the hysteresis loop. The accuracy of this approach was studied for highly non-linear behavior through analytical solutions and numerical simulations of a single degree of freedom system. Only the effect of the shape of the hysteresis loop was studied, i.e. the stiffness and the area of the loop were kept constant independent of amplitude. The study shows that irregular hysteresis may cause a significant increase in the response of the system in higher frequencies compared to what would be expected …
In Situ And Laboratory Tests For The Evaluation Of Dynamic Geotechnical Properties Of A Cohesive Deposit In Florence, T. Crespellani, G. Vannucchi, A. Ghinelli
In Situ And Laboratory Tests For The Evaluation Of Dynamic Geotechnical Properties Of A Cohesive Deposit In Florence, T. Crespellani, G. Vannucchi, A. Ghinelli
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In order to determine dynamic parameters to use for seismic microzoning purposes in a new development area near Florence, the dynamic behavior of the alluvial silty clays situated in the upper 60 m of the deposit was experimentally investigated using geophysical surveys and cyclic laboratory tests. Previous studies on the geotechnical properties of the clays of Florence revealed that, in spite of some similarities in a comparison with other coeval clays described in the literature this soil exhibits a few anomalies, as e.g. higher variations between field and laboratory shear waves velocities and remarkable differences in the coefficients of the …