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Articles 8371 - 8400 of 10556
Full-Text Articles in Entire DC Network
Coupled Horizontal And Rocking Vibration Of Block Foundations, Sanjeev Kumar, Shamsher Prakash
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 …
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.
Factors Affecting Vibration Induced Settlement, D. S. Kim, S. Drabkin
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.
Seismic Response On Full-Size Pile Group, Y. C. Han, G. C. W. Sabin
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.
Soil Damping And Its Use In Dynamic Analyses, A. K. Ashmawy, R. Salgado, S. Guha, V. P. Drnevich
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 …
A Unified Procedure For Earth Pressure Calculations, Ashok K. Chugh
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 …
Study Of Seismic Base Isolation Of Bridge Considering Soil Structure Interaction, S. K. Thakkar, Rajesh Maheshwari
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 …
Discussions And Replies — Session Ix, Multiple Authors
Discussions And Replies — Session Ix, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
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.
Dynamics Of Rigid Foundations On Fluid-Saturated Soil, A. R. Khoee, A. M. Kaynia
Dynamics Of Rigid Foundations On Fluid-Saturated Soil, A. R. Khoee, A. M. Kaynia
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper presents a three-dimensional boundary element formulation for the steady-state dynamic analysis of fluid saturated porous media. The coupled differential equations are derived from the field equations by the application of the Fourier Transform. The boundary integral formulation is obtained by the weighted residual method and the associated fundamental solutions are obtained by the method developed by Kupradze. The boundary element model is used to obtain compliance functions of square rigid foundations bonded to the surface of a water-saturated half-space. The effect of the soil permeability on the variation of the compliance functions is also examined.
Seismic Vibration Of Nuclear Power Station Building, V. G. Bedniakov, S. S. Nefedov, N. S. Shvets
Seismic Vibration Of Nuclear Power Station Building, V. G. Bedniakov, S. S. Nefedov, N. S. Shvets
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Reactor Building is considered as a system with concentrated masses. The movement of the system is described with account of elastic component, shear and rotation of the base relatively foundation. Seismic excitation is described by set of accelerogramms. The equations of movement are solved using complex modal analysis. Natural frequencies are acceleration functions for masses of the system are defined.
A New Seismic-Geotechnical Strong Motion Approach, Francois E. Heuze, Tzou-Shin Ueng, Lawrence J. Hutchings, Stephen P. Jarpe, Paul W. Kasameyer
A New Seismic-Geotechnical Strong Motion Approach, Francois E. Heuze, Tzou-Shin Ueng, Lawrence J. Hutchings, Stephen P. Jarpe, Paul W. Kasameyer
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
We have developed a new approach to estimate site-specific strong motion due to earthquakes on specific faults or source zones. It combines seismologic and geotechnical studies. It entails obtaining records of small earthquakes at the site, both at the surface and downhole in bedrock, as well as performing geotechnical dynamic site characterization. This new approach has the dual result of providing an optimized definition of the dynamic geotechnical site properties and providing calculated free-field, strong motion estimates. The procedure is demonstrated at the Painter Street Bridge site in Rio Dell, CA, for which we provide a range of surface motions …
The Evolution Of Geotechnical Earthquake Engineering Practice In North America: 1954-1994, W. D. Liam Finn, R. H. Ledbetter, W. F. Marcuson Iii
The Evolution Of Geotechnical Earthquake Engineering Practice In North America: 1954-1994, W. D. Liam Finn, R. H. Ledbetter, W. F. Marcuson Iii
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper traces the evolution of geotechnical earthquake engineering practice in North America from 1954 to 1994. The development of the state-of-the-art has been shaped strongly by four areas of practice: assessment of seismic hazard, estimation of liquefaction potential, seismic response analysis of earth structures and seismic safety evaluation and remediation of existing dams with potentially liquefiable zones. Evolution of practice in each of these areas will be traced and the current state-of-the-art evaluated. Present capabilities in practice will be illustrated by examples from the areas of seismic response of dams, liquefaction potential and seismic safety evaluation and remediation of …
Simple Physical Models For Foundation Dynamics, John P. Wolf
Simple Physical Models For Foundation Dynamics, John P. Wolf
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
As an alternative to rigorous boundary-element solutions, simple physical models can be used to determine e.g. the interaction force-displacement relationship (dynamic stiffness) of foundations and the seismic effective foundation input motion. Translational and rotational cones and their corresponding lumped-parameter models together with simple one-dimensional wave patterns in the horizontal plane allow surface, embedded and pile foundations even for a layered site to be analyzed and thus form a major step towards developing a strength-of-materials approach to foundation - vibration analysis. The analysis can mostly be performed directly in the time domain. The physical models provide physical insight which is often …
Wave Propagation In The Ground And Isolation Measures, W. A. Haupt
Wave Propagation In The Ground And Isolation Measures, W. A. Haupt
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The first part of this report deals with wave propagation in the ground. Special attention is given to the radiation of waves from a source and on the effect of layering or continuous variation of the shear modulus in the soil on travelling waves. In the second part, vibration isolation measures are described, such as open or infilled trenches and rows of bore holes or piles. The results of different theoretical and experimental investigations are compared. Finally, recently developed isolation measures are presented.
Lessons Learned From Liquefaction And Lifeline Performance During San Francisco Earthquakes, T. D. O'Rourke, J. W. Pease
Lessons Learned From Liquefaction And Lifeline Performance During San Francisco Earthquakes, T. D. O'Rourke, J. W. Pease
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper presents information about subsurface conditions, liquefaction-induced ground movements, and lifeline performance during the 1906 and 1989 earthquakes in San Francisco. Three sites of soil liquefaction and pipeline damage during both earthquakes are evaluated, including the Marina, South of Market, and Mission Creek areas. Important lessons are summarized about the effects of transient lateral shear strains on pipeline performance, post liquefaction consolidation, use of submerged fill thickness as a microzonation technique for predicting liquefaction severity and potential pipeline damage, the relationship between surface manifestations of liquefaction and subsurface geometry of deposits, and factors affecting the magnitude of lateral spread.
Role Of In-Situ Testing In Geotechnical Earthquake Engineering, M. Jamiolkowski, D.C. F. Lopresti, O. Pallara
Role Of In-Situ Testing In Geotechnical Earthquake Engineering, M. Jamiolkowski, D.C. F. Lopresti, O. Pallara
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The available in situ testing techniques of special relevance in Geotechnical Earthquake Engineering are subject to a synthetic review in the light of the general framework of soil stress-strain behavior. Especial attention is devoted to the recent innovations and current capabilities of in situ testing methods to assess the shear modulus G and damping ratio D. The determination of the undrained steady state shear strength via penetration and seismic tests is also discussed.
Design And Behavior Of Tailings Dams Under Seismic Conditions, Jorge H. Troncoso
Design And Behavior Of Tailings Dams Under Seismic Conditions, Jorge H. Troncoso
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Seismic design of tailings dams in present times has to provide satisfactory solutions to fulfill environmental protection requirements and to assure proper behavior after closure and abandonment. The requirements to protect the environment include control of seepage and other forms of pollution of the air, waters and soils, under normal conditions, and also under the most extreme events which may be foreseen to occur. The worst possible form of pollution under such extreme conditions is a liquefaction failure involving breaching of the dam and flooding of the valleys downstream. The probability of occurrence of maximum events obviously increases with the …
Discussions And Replies — State-Of-The-Art, Multiple Authors
Discussions And Replies — State-Of-The-Art, Multiple Authors
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.
Microconcrete Subjected To Static And Dynamic Compression Loadings, Bassam Hwaija
Microconcrete Subjected To Static And Dynamic Compression Loadings, Bassam Hwaija
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The object of our paper is to consider the influence of the particularly important factor, and to achieve a model describing the behavior of the microconcrete. The specimens have been loaded in rates ranging from 0.0001 to 800 (1/s). The results are discussed available in the literature.
On Seismic Design Displacements Of Rigid Retaining Walls, Shamsher Prakash, Yingwei Wu, Eyjolfur Ami Rafnsson
On Seismic Design Displacements Of Rigid Retaining Walls, Shamsher Prakash, Yingwei Wu, Eyjolfur Ami Rafnsson
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Correlation of the dynamic displacement and significant factors are presented. Three computer programs (Rafnsson, 1991) have been modified to develop design charts. The wall dimension computed by static condition and related displacement under dynamic loading can be estimated from the computer programs. Twenty-one combinations of base soil and back fill, 5 different ground motions and 7 different heights of wall are used in the analyses to develop design charts. These will help the designer to predict the dynamic behavior of retaining walls and to optimize the design work. Furthermore, equations have been fitted to predict the displacement without using the …
Seismic Design Of Ribbed Foundation Plates, E. B. Koreneva
Seismic Design Of Ribbed Foundation Plates, E. B. Koreneva
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Circular foundation plates of variable thickness reinforced by ring ribs and resting on an elastic subgrade subjected to an action of seismic loads are investigated. Rigorous solutions of the posed problems are obtained.
Spectral Study Of Soil-Pile-Structure Interaction Based On Observed Data, Fan Lang Kong, Roger Ghanem
Spectral Study Of Soil-Pile-Structure Interaction Based On Observed Data, Fan Lang Kong, Roger Ghanem
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Spectral analysis and system identification algorithm are used to analyze a set of acceleration response records obtained from a shaking table test. The method is based on the linear discrete time systems theory, and the soil-pile system can be represented as a linear filter of a finite order with time-varying coefficients. The recorded ground motion at the pile tip is the input, and the motion at the different level along the pile and the structure is the output of the filter. Knowing the input and output, the time varying parameters of the filter can be determined by using the system …
Discussions And Replies — Session Vi, Multiple Authors
Discussions And Replies — Session Vi, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Longitudinal Waves In A Rod In An Elastic Medium, A. Bodare, I. K. Eriksson, K. Samuelsson
Longitudinal Waves In A Rod In An Elastic Medium, A. Bodare, I. K. Eriksson, K. Samuelsson
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The general equations for the propagation of longitudinal waves in an infinite cylindrical rod including the effect of a surrounding elastic medium have been derived in order to obtain the relationship between the circular frequency and the wave number. A comparison has then been made with the Smith model in order to investigate the limits of the model and to refine the expressions for the spring and damming constants.
Dispersion Of Longitudinal Waves Propagating In A Continuum With Randomly Perturbated Parameters, J. Náprstek
Dispersion Of Longitudinal Waves Propagating In A Continuum With Randomly Perturbated Parameters, J. Náprstek
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The author investigates the propagation of wave motion in a continuum the material parameters of which are random functions of longitudinal coordinate. The analysis is based on the theory of Markov processes and the subsequent solution on the respective Fokker-Planck-Kolmogorov equation. The fully deterministic response in the excitation point transforms into nonhomogeneous random process in the longitudinal coordinate with the growing distance. The quota of the deterministic component in overall response drops until it disappears completely. The model of uncorrelated imperfections (white noise) of the continuum is inacceptable, because it is at variance with the energy equilibrium law. The results …
Elastic Models Of Rock Due To Explosion Pressures, Sanga Tangchawal
Elastic Models Of Rock Due To Explosion Pressures, Sanga Tangchawal
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Basic theories of wave pulse initiated from conventional blasting were reviewed. Mechanics of various stress wave forms of explosion pressure were proved. A new suggested solution of displacement potential by Rinehart instead of Sharpe or Duvall's suggestion, was used to find the optimum solution. From the mathematical research models, in which they were written as a package program in C language and used Microsoft visual basic as user interface, they proved that a typical cylindrical charge explosion in a bench may take on some of the characteristics of a concentrated charge explosion.
Dynamic Shear Modulus And Damping Ratio Predicted By A Unified 3-D Critical State Bounding Surface Plasticity Model, John P. Wolf, Roger S. Crouch
Dynamic Shear Modulus And Damping Ratio Predicted By A Unified 3-D Critical State Bounding Surface Plasticity Model, John P. Wolf, Roger S. Crouch
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A unified 3-d critical state bounding surface plasticity model (gUTS) has been developed which is able to provide realistic simulations of the behavior of clays, silts and sands both in drained and undrained conditions over a wide range of monotonic and complex cyclic paths. A strong feature of this model is its ability to treat loose and dense states of the same material with a single set of material constants. The link between the two states is made by introducing an apparent normal consolidation line for sands and adopting a volumetric plastic strain hardening/softening model (similar to the critical state …
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 …