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Articles 32221 - 32250 of 40030

Full-Text Articles in Engineering

Coupled Horizontal And Rocking Vibration Of Block Foundations, Sanjeev Kumar, Shamsher Prakash Apr 1995

Coupled Horizontal And Rocking Vibration Of Block Foundations, Sanjeev Kumar, Shamsher Prakash

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The computation of coupled response of block foundations subjected to a constant magnitude harmonic horizontal force or moment or both, is very important for the design of block foundations. Mathematical relationships for computing response of rigid block foundations using the elastic half-space method lite available but are not in an easily understandable format. More over relationships available for embedded foundation are for the case when both horizontal force and moment are acting on the foundation. To extract the solution for the case when either horizontal force or moment alone is acting from the existing relationships is extremely difficult, if not …

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General Report —Session Iii: Liquefaction And Ground Failure, Susumu Iai, R. H. Ledbetter, L. Figueroa, K. K. Muraleetharan, S. Yasuda Apr 1995

General Report —Session Iii: Liquefaction And Ground Failure, Susumu Iai, R. H. Ledbetter, L. Figueroa, K. K. Muraleetharan, S. Yasuda

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.

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General Report —Session Iv: Dynamic Earth Pressures And Seismic Design Of Earth Retaining Structures, Forrokh Nadim, S. Ihara, A. Pecker, E. A. Rafnsson Apr 1995

General Report —Session Iv: Dynamic Earth Pressures And Seismic Design Of Earth Retaining Structures, Forrokh Nadim, S. Ihara, A. Pecker, E. A. Rafnsson

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.

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Discussions And Replies — Session I, Multiple Authors Apr 1995

Discussions And Replies — Session I, Multiple Authors

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.

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Factors Affecting Vibration Induced Settlement, D. S. Kim, S. Drabkin Apr 1995

Factors Affecting Vibration Induced Settlement, D. S. Kim, S. Drabkin

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

In urbanized areas, vibration induced settlement on granular soils depends on vibration characteristics including vibration path and source, in-situ stress conditions, and soil properties. Quantitative laboratory assessment of settlement was extrapolated using parametric study of in-situ settlement of sands. It is shown that vibration amplitude should be monitored within the vulnerable soil layers or evaluated considering attenuation characteristics of soil. Combining the effects of influencing factors, the discussed model can be utilized to predict vibration induced settlement of structures on sand.

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Seismic Response On Full-Size Pile Group, Y. C. Han, G. C. W. Sabin Apr 1995

Seismic Response On Full-Size Pile Group, Y. C. Han, G. C. W. Sabin

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Seismic response of pile group is investigated in both theory and experiment. The dynamic experiments were conducted on a full-size pile group in linear vibration and nonlinear vibration respectively, and the impedances of group were determined using the boundary zone model with non-reflective interface. The theoretical and experimental results indicate that the response of pile group may be increased substantially with the nonlinearity of soil-pile system in a seismic event, and there is a pronounced increase in the horizontal seismic response of group with the pile-soil-pile interaction.

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Performance Of Landfills Under Seismic Loading, D. G. Anderson, E. Kavazanjian Jr. Apr 1995

Performance Of Landfills Under Seismic Loading, D. G. Anderson, E. Kavazanjian Jr.

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The record of performance of landfills in earthquakes is excellent. However, the advent of geosynthetic liner and cover systems has increased the susceptibility of modern landfills to seismically-induced instability and deformations. Analyses used to assess the performance of landfills in earthquakes include site response, limit equilibrium stability, and Newmark deformation analyses. Well documented case histories of the behavior of landfills subject to seismic loading are necessary to improve knowledge of the parameters required for these analyses and thereby enhance the reliability of seismic performance evaluations for landfills.

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Preface, Shamsher Prakash Apr 1995

Preface, Shamsher Prakash

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.

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Organizing Committee Meeting: Agenda And Minutes, Multiple People Apr 1995

Organizing Committee Meeting: Agenda And Minutes, Multiple People

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.

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Dynamic Geotechnical Comparative Testing Capability, W. Henke, R. Henke Apr 1995

Dynamic Geotechnical Comparative Testing Capability, W. Henke, R. Henke

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

A concept and preliminary design are presented for a special testing capability to be added to an existing large laboratory geotechnical testing chamber. The modified chamber is intended to allow, through comparative testing, the reasonably rigorous evaluation of methods for providing detailed information, for soil deposits, on in situ undegraded nonlinear inelastic shear stress vs strain characteristics needed for dynamic geotechnical earthquake engineering analyses. Basically, the added capability is to be a large resonant column-like torsional testing system that tests the entire chamber sample and allows access to the center of the sample for the testing of the method to …

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High Pressure Cyclic Triaxial Tests, Jianren Wang, Clay E. Sams, John D. Lawrence, Harry Johnson Apr 1995

High Pressure Cyclic Triaxial Tests, Jianren Wang, Clay E. Sams, John D. Lawrence, Harry Johnson

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Shear modulus and damping from high pressure (up to 500 psi) cyclic triaxial tests of soils are presented. The test results are compared with published models where low confining pressures were used. The apparatus and test setup for the high pressure tests are also discussed.

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Study On Cyclic Shear Strength Of Soils From Different Methods, Chi-Tso Chang, Jin-Hung Hwang Apr 1995

Study On Cyclic Shear Strength Of Soils From Different Methods, Chi-Tso Chang, Jin-Hung Hwang

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This paper compares the cyclic strengths of soils from different methods using intensive investigations at a recent alluvial site on the southwest Taiwan. Generally speaking, the cyclic shear strengths deduced from different methods exhibit the following trend: Block sample > Tube sample ↔ SPT -N (Standard Penetration Test) method > seismic Vs method > CPT-qc (Cone Penetration Test) method.

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Soil Damping And Its Use In Dynamic Analyses, A. K. Ashmawy, R. Salgado, S. Guha, V. P. Drnevich Apr 1995

Soil Damping And Its Use In Dynamic Analyses, A. K. Ashmawy, R. Salgado, S. Guha, V. P. Drnevich

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Soil response under dynamic loading has been modeled using linear-viscoelasticity for many decades. The definitions of various damping-related quantities are reviewed and the implications of their use in the analysis of continuous masses are given. The selection of an equivalent damping ratio as a parameter for modeling damping in most geotechnical applications is discussed together with the assumptions underlying the selection procedure. The techniques for damping determination using laboratory testing are summarized, emphasizing the influence that factors such as apparatus type, loading path, rate of loading, and strain level have on the measurement. Disturbance effects in samples recovered from the …

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Evaluation Of Bender Elements For Use With Coarse-Grained Soils, S. Nazarian, S. S. Baig Apr 1995

Evaluation Of Bender Elements For Use With Coarse-Grained Soils, S. Nazarian, S. S. Baig

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The feasibility of using piezo-ceramic bender elements for measuring shear modulus of coarse materials has been reported. If was found that moduli obtained from bender element are repeatable. The results in most cases compare favorably with those obtained by resonant column.

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Static Shear And Liquefaction Potential Of Sand, Chung-Jung Lee Apr 1995

Static Shear And Liquefaction Potential Of Sand, Chung-Jung Lee

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The state parameter, which describes the initial state of sand before shearing, combining with the concepts of critical stress ratio line and phase transform line are used to assess the characteristics of sand during shearing. The state parameter of each tested sample is determined after the steady state line is constructed, and then relations of characteristics of the cyclic deformation behavior and the state parameter of sand are discussed. The value of the lowest point, Sup1 on the CSR line in the p’ – q plot is related to ec for a specific sand. Once the stress path of …

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Effects Of Earthquake Induced Rates Of Shearing On Residual Soil Strength, Achilleas N. Parathiras Apr 1995

Effects Of Earthquake Induced Rates Of Shearing On Residual Soil Strength, Achilleas N. Parathiras

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The behavior of soils when sheared at high rates of displacement, such as those which may be induced by earthquakes, has been investigated by means of the ring shear apparatus. Plastic and non-plastic soils were tested normally and over-consolidated, remoulded and dry, submerged and non-submerged in water, in order to assess the effect which the stress history and the presence of water in the matrix and the environment of the sample have on its response upon fast shearing. It was concluded that two types of behavior exist which depend on the nature of each sample and the presence of water …

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Effect Of Fines Content On The Cyclic Undrained Behavior Of Sand, D. Erten, M. H. Maher Apr 1995

Effect Of Fines Content On The Cyclic Undrained Behavior Of Sand, D. Erten, M. H. Maher

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The influence of fines on the liquefaction potential of sandy soils has been studied by conducting isotropically consolidated stress controlled triaxial tests. Experimental results are compared with predictions using the theory developed by Nasser and Shokooh which is based on energy considerations. The theory determines the excess pore water pressure in terms of the number of cycles N, the dimensionless shear stress amplitude, and the initial and minimum values of the void ratio. The comparisons show good agreement between experimental data and model predictions for the pore water generation under cyclic loading for both loose and medium sands and medium …

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Cycle Plate Load Tests On Reinforced Sand, Swami Saran, B. V. K. Lavania, R. K. Sharma Apr 1995

Cycle Plate Load Tests On Reinforced Sand, Swami Saran, B. V. K. Lavania, R. K. Sharma

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This paper presents a set of results of laboratory scale model footing tests conducted to determine the cyclic load resistance of sand beds reinforced with horizontal sheets of geogrid. The test results indicate that the total settlement decreases and the bearing capacity increases, with the increase in size of reinforcements and number of layers. With the inclusion of reinforcing sheets, ·the coefficient of elastic uniform compression decreases slightly; but this decreased value is valid up to the increased bearing capacity of the reinforced sand bed. There is significant improvement in the damping capacity upon reinforcing the sand bed as indicated …

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Liquefaction Damage Of Sandy And Volcanic Grounds In The 1993 Hokkaido Nansei-Oki Earthquake, S. Miura, K. Yagi, S. Kawamura Apr 1995

Liquefaction Damage Of Sandy And Volcanic Grounds In The 1993 Hokkaido Nansei-Oki Earthquake, S. Miura, K. Yagi, S. Kawamura

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The 1993 Hokkaido Nansei-Oki Earthquake of magnitude 7.8 caused widespread and significant damage in south west area of Hokkaido, Japan. The soil liquefaction was induced at many locations, which resulted in considerable damage to structures, lifelines, and facilities. In order to evaluate their in-situ liquefaction strengths, the site investigation involved the conduct of standard penetration test (SPT) was performed at several key locations. A series of cyclic undrained triaxial tests was also carried out on soil samples taken from liquefied grounds. Test results showed that the mechanism of increase in the liquefaction strength due to the increase in relative density …

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Effect Of The Grain Size On The Energy Per Unit Volume At The Onset Of Liquefaction, J. Ludwig Figueroa, Adel S. Saada, Liqun Liang Apr 1995

Effect Of The Grain Size On The Energy Per Unit Volume At The Onset Of Liquefaction, J. Ludwig Figueroa, Adel S. Saada, Liqun Liang

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Recent exploratory work by the authors indicated the feasibility of relating the development of the pore water pressure leading to liquefaction of soils subjected to earthquake loading to the amount of unit energy imparted to the soil during the dynamic motion. This research also showed that regardless of the mode of stress application, sinusoidal or random, the unit energy needed to initiate liquefaction is nearly constant for a given effective confining stress and a specific relative density, demonstrating that the unit energy is independent of the shear strain amplitude. Data obtained during torsional shear tests on a given soil made …

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Co-Reporter's Remarks — Session Iii, B. O. Skipp Apr 1995

Co-Reporter's Remarks — Session Iii, B. O. Skipp

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.

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A Unified Procedure For Earth Pressure Calculations, Ashok K. Chugh Apr 1995

A Unified Procedure For Earth Pressure Calculations, Ashok K. Chugh

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

A unified procedure for calculating active and passive earth pressures on retaining structures for static and seismic (pseudostatic) loading conditions is presented. The procedure is based on the limit equilibrium method, uses the method of slices, and satisfies complete statics. Necessary equations for a typical slice are presented and a solution scheme for solving them is discussed. A sample problem is included to indicate convenience of use of the proposed procedure and accuracy of results obtained. The results are in terms of magnitude, direction, and location of lateral thrust on the wall; however, distribution of earth pressure along the wall …

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Study Of Seismic Base Isolation Of Bridge Considering Soil Structure Interaction, S. K. Thakkar, Rajesh Maheshwari Apr 1995

Study Of Seismic Base Isolation Of Bridge Considering Soil Structure Interaction, S. K. Thakkar, Rajesh Maheshwari

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

In this paper, a comprehensive study of seismic response of base isolated bridge is made by varying different parameters such as soil stiffness, embedment depth, hydrodynamic pressure and earthquake response spectrum. The object is to determine effect of soil-structure interaction on seismic response when isolation by elastomeric bearing is provided between superstructure and substructure. Elastomeric bearing is seen to be effective in reducing seismic response of substructure on rocky site. The increase in embedment depth also causes reduction in bending moments and shear forces in the substructure. The use of elastomeric bearing in place of Rocker-Roller bearing is seen to …

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Consistent Infinitesimal Finite-Element Cell Method: In-Plane Motion, John P. Wolf, Chongmin Song Apr 1995

Consistent Infinitesimal Finite-Element Cell Method: In-Plane Motion, John P. Wolf, Chongmin Song

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

To calculate the unit-impulse response matrix of an unbounded medium for use in a time-domain analysis of medium-structure interaction, the consistent infinitesimal finite-element cell method is developed. Its derivation is based on the finite-element formulation and on similarity. The limit of the cell width is performed analytically yielding a rigorous representation in the radial direction. The discretization is only performed on the structure-medium interface. Explicit expressions of the coefficient matrices for the in-plane motion of anisotropic material are specified. In contrast to the boundary-element formulation, no fundamental solution is necessary and equilibrium and compatibility on the layer interfaces extending from …

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Elasto-Plastic Seismic Response Analysis Of Earth Dams, A. N. Yiagos Apr 1995

Elasto-Plastic Seismic Response Analysis Of Earth Dams, A. N. Yiagos

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

A simplified and efficient numerical model is developed to perform the phenomenological elasto-plastic seismic response analysis of earth dams. The method is based on a two-dimensional Galerkin formulation of the equations of motion for the dam material, and accounts for the presence of water inside the dam. The soil skeleton nonlinear hysteretic response is modelled using an effective stress multi-yield function elasto-plastic constitutive model. The model is validated using actual transient ground motions as input and the computed responses are compared with the motions recorded at the respective sites. The ability of the model to simulate the occurrence of liquefaction …

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Seismic Stability Analysis Of A High Earth And Rockfill Dam, N. Deng, F. Ostadan, I. Arango, J. Marrone Apr 1995

Seismic Stability Analysis Of A High Earth And Rockfill Dam, N. Deng, F. Ostadan, I. Arango, J. Marrone

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Accumulation of knowledge on earthquake activity in California has lead to stronger ground motions being postulated for the evaluation of the seismic stability of dams. A recent regional seismicity study for a 555 ft high earth and rockfill dam in central California lead to a ground motion with peak ground acceleration (PGA) of 0.50g originating in a local fault system 3 miles from the dam site. This PGA is more than 6 times higher than the PGA=0.08g value originally adopted when the Dam was analyzed for seismic stability 20 years ago. Thus, as part of FERC Part 12 evaluation requirements, …

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Behavior And Damage Of Dams Under The 1993 Big Earthquakes In Japan, Tomoya Iwashita, Akira Nakamura, Nario Yasuda Apr 1995

Behavior And Damage Of Dams Under The 1993 Big Earthquakes In Japan, Tomoya Iwashita, Akira Nakamura, Nario Yasuda

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

By analyses of the acceleration records at dams during the two big earthquakes which hit in Hokkaido of Japan in 1993, the maximum acceleration at damsite rock, the maximum acceleration amplification ratios at crest and the natural periods of dam bodies were evaluated and were compared the results with empirical equations. Damage to the dams was described, and the mechanism of the deformations was examined.

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Earthquake-Induced Lateral Displacement Of A Landfill, Tzyy-Shiou Chang, Bao-Zhu Wei, Kuo-Ping Chang, Kenneth M. Hall Apr 1995

Earthquake-Induced Lateral Displacement Of A Landfill, Tzyy-Shiou Chang, Bao-Zhu Wei, Kuo-Ping Chang, Kenneth M. Hall

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

In the wake of stability failure of the Kettleman Hills Waste Repository on March 19, 1988, the stability of landfill mass in earthquake-prone areas has become an important issue in the community. Based on a proposed landfill site in the Memphis, Tennessee area, this paper studies behaviors of landfills under various landfill and earthquake conditions (height and slope angle of the landfill, average unit weight of the landfill refuse, and peak acceleration and time duration of bedrock motion) by calculating lateral displacements induced by a design earthquake. Results indicate that lateral displacement of a landfill is proportional to the slope …

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Effect Of Building Configuration On Seismic Response Parameters, A. S. Elnashai, M. M. Soliman Apr 1995

Effect Of Building Configuration On Seismic Response Parameters, A. S. Elnashai, M. M. Soliman

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

To contribute to the available information on the inelastic performance of irregular structures, the investigation of four building characteristics on it seismic response was initiated. These characteristics are column height, beam-to-column capacity, stiffness distribution in elevation and set-backs and non-symmetric elevation configuration. The parametric study presented in the paper is intended to be more indicative than comprehensive, since simplifications in the modeling of structures were necessary.

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Discussions And Replies — Session Vii, Multiple Authors Apr 1995

Discussions And Replies — Session Vii, Multiple Authors

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.

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