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A Hybrid Modeling Of Soil Structure Interaction Problems, Celso Romanel, Tribikram Kundu Mar 1991

A Hybrid Modeling Of Soil Structure Interaction Problems, Celso Romanel, Tribikram Kundu

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

A hybrid method is proposed in this research for dynamic soil-structure interaction analysis of embedded structures within a multilayered elastic half-space. A near field region, containing the structure and a portion of soil surrounding it, is modeled by finite elements while the far field formulation is obtained through the classical wave propagation theory based on the assumption that the actual scattered wave fields can be represented by a set of line sources located at a depth corresponding to the center of mass of the structure under investigation. Traction reciprocity between the two regions is satisfied exactly while displacement continuity across …

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Seismic Behaviour Of Bridges Considering Soil-Structure Interaction, S. K. Thakkar, D. K. Mazumdar, P. R. Bose Mar 1991

Seismic Behaviour Of Bridges Considering Soil-Structure Interaction, S. K. Thakkar, D. K. Mazumdar, P. R. Bose

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

The soil-structure interaction has significant effect on seismic response of bridges in many situations. The choice of soil springs for response determination is an important consideration. This paper presents a comparative assessment of the seismic response of bridge substructure by four different types of frequency independent soil springs namely, Beredugo-Novak, Wolf, Bycroft-Parmelee and Terzaghi. The variation of equivalent weighted damping and equivalent seismic coefficient is also studied. The Terzaghi's soil springs obtained by modulus of subgrade reaction approach are most flexible as compared to others. The responses are seen to be comparable with springs other than Terzaghi. The equivalent damping …

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Soil-Structure Interaction Effects Based On Recorded Strong Motions During Earthquakes, Kosta Talaganov, Misko Cubrinovski Mar 1991

Soil-Structure Interaction Effects Based On Recorded Strong Motions During Earthquakes, Kosta Talaganov, Misko Cubrinovski

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

Presented in this paper are the results of the analyses of dynamic soil-structure interaction effects based on recorded strong motions during Montenegro (Yugoslavia) earthquake of April 15, 1979. Acceleration time histories have been recorded by strong motion instruments installed at foundation level of structures located in the epicentral area, founded in different soil conditions including stiff, medium and soft soils. Applying substructure technique from known motions at foundation level of structures, corresponding free field motions were computed. By comparison of computed free field motions and recorded motions at foundation level, dynamic soil-structure interaction effects, in different soil conditions and levels …

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Liquefaction Potential Prediction By Multiple Stage Multifactorial Evaluation, Limin Zhang, Ting Hu Mar 1991

Liquefaction Potential Prediction By Multiple Stage Multifactorial Evaluation, Limin Zhang, Ting Hu

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

Factors affecting liquefaction are analyzed. Qualitative factors along with liquefaction itself are conceived to be of fuzziness the common methods cannot deal with. A new method – the Multiple-Stage Multifactorial Evaluation is introduced to evaluate the liquefaction potential of sand which can take into account not only the factors considered by the common methods but also these qualitative factors which otherwise cannot be considered by the explicit mathematic evaluation methods and can treat each factor according to its importance to liquefaction. Tests with the method show a higher correct evaluation rate over other methods. Conclusion is drawn about the liquefaction …

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Liquefaction Fragilities For Buried Lifelines, Jose A. Pires, A. H.-S. Ang, I. Katayama Mar 1991

Liquefaction Fragilities For Buried Lifelines, Jose A. Pires, A. H.-S. Ang, I. Katayama

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

For buried structures, such as conduits and underground pipes, liquefaction induced forces will depend on the volume of soil surrounding the structure that will liquefy. Here, a methodology to calculate the probability of the onset of liquefaction at a given depth in a soil deposit is extended to assess the probability that a specified volume of soil will liquefy when liquefaction occurs at a given depth in the deposit. To account for the variability of soil properties with depth, the soil deposit is divided into horizontal layers and the volume of liquefied soil in each layer is calculated as the …

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A Comparison And Study On Artificial Boundaries: Conceptual Aspects, Zifa Wang Mar 1991

A Comparison And Study On Artificial Boundaries: Conceptual Aspects, Zifa Wang

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

The paper first analyzes the characteristics of various artificial boundaries (similarity and dissimilarity) and the derivation conditions of the boundaries. The problems involved in applying the artificial boundary in numerical computation and the solution to the problem are also discussed in the paper.

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Dynamic Response Of Flexible Foundations On Multilayered Medium, Wang Fuming Mar 1991

Dynamic Response Of Flexible Foundations On Multilayered Medium, Wang Fuming

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

The dynamic response of flexible strip-foundations placed on a viscoelastic multi-layered medium under conditions of plane strain and subjected to harmonic excitation is studied in this paper. A semi-analytic model is developed to determine the dynamic flexibility matrix of the medium, and the spline finite element method is employed to treat the foundation. The two methods are appropriately combined through equilibrium and compatibility considerations at the soil-foundation interface. Numerical results describing the influence of the non-homogeneity of the soil medium on the compliance are presented, and the effects of the relative stiffness Kr on the foundation response are briefly discussed.

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Response Of Pile Under Dynamic Loading, Somnath Bandyopadhyay Mar 1991

Response Of Pile Under Dynamic Loading, Somnath Bandyopadhyay

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

The need for a better understanding of soil pile interaction problem under dynamic loading especially in a nonlinear soil medium has always been felt by engineers. This paper presents a PC based Finite Element I Finite Difference analysis of a Three Dimensional soil pile interaction problem in Elasto Plastic soil under transient and periodic dynamic loading. Assuming separation of variable is permitted method of Finite Element has been used over space and then the solution proceeds over time by explicit integration. Numerical experimentation with a 3 x 3 x 3 model offers a stable response which (qualitatively) with Green's function …

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Study On Dynamic Characteristics Of A Pile Group Foundation, Takuji Kobori, Kenji Miura, Masaaki Nakazawa, Katsuichiro Hijikata, Yuji Miyamoto, Takafumi Moroi, Yoshinao Kobayashi Mar 1991

Study On Dynamic Characteristics Of A Pile Group Foundation, Takuji Kobori, Kenji Miura, Masaaki Nakazawa, Katsuichiro Hijikata, Yuji Miyamoto, Takafumi Moroi, Yoshinao Kobayashi

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

The earthquake response of a structure on group of piles is investigated. The test model, which is employed in this study, is a foundation on four piles. Three conditions are prepared for examination of the contact effects of the foundation bottom and the backfilling effects on dynamic characteristics of the foundation on the piles. Forced vibration tests are carried out for ascertaining the impedance functions as the inertial interaction, and earthquake observations for the earthquake input motion as the kinematic interaction. On the basis of the test and the observation results, the correlation analyses are executed for examining the applicability …

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A Variational Formulation For Classical Models Of The Slope Stability With Earthquake Effect, Petr Koudelka, Petr Procházka Mar 1991

A Variational Formulation For Classical Models Of The Slope Stability With Earthquake Effect, Petr Koudelka, Petr Procházka

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

The paper deals with an extension of application of the Method of Apriori Integration to a model of a general slope, which is partly homogeneous and which is loaded also by the earthquake effect. The most dangerous direction of the power effect of the vibration is shown and for this direction the change of safety factor is discussed. The effect of reduced shear strength is included.

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Automated Slope Stability Analysis Of Zoned Dams, P. K. Basudnar, Yudhbir Dhawan, R. K. Dhawan Mar 1991

Automated Slope Stability Analysis Of Zoned Dams, P. K. Basudnar, Yudhbir Dhawan, R. K. Dhawan

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

The study pertains to the pseudo-static stability analysis of zoned dams with geologic discontinuities in the foundation. Sequential unconstrained minimization technique in conjunction with Janbu's generalized procedure of slices has been used for finding the critical slip surface and the corresponding minimum factor of safety. The method has been found to be quite efficient in solving such problems.

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Session 7: Discussions And Replies, Multiple Authors Mar 1991

Session 7: Discussions And Replies, Multiple Authors

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

No abstract provided.

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Response Of Earth Dam With Underground Concrete Cut-Off Wall, Wanhong Li, Wenshao Wang Mar 1991

Response Of Earth Dam With Underground Concrete Cut-Off Wall, Wanhong Li, Wenshao Wang

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

The response of earth dam with underground concrete cut-off wall during construction, at normal operation and under earthquake action has been evaluated and some interesting research' results such as seismic permanent displacement are obtained. A new nonlinear dynamic model of cohesionless soils, consisting of unclosed hysteresis loop, moving back bone curve and static loading curve, is presented. Shear stress ratio controlled cyclic triaxial tests and ultrasonic shear wave velocity tests have been performed to measure the parameters of the model. The shear resistance at sand/concrete interface has been studied by making tests in a torsional shear testing device.

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Response Of Earth Dams In Canyons Subjected To Asynchronous Base Excitation, Panos Dakoulas, Humayun Hashmi Mar 1991

Response Of Earth Dams In Canyons Subjected To Asynchronous Base Excitation, Panos Dakoulas, Humayun Hashmi

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

A mathematical solution is presented for steady-state lateral response of earth and rock fill dams in canyons subjected to asynchronous excitation consisting of obliquely incident SH waves. The dam is idealized with a 2-dimensional shear wedge and the canyon is considered rectangular and consisting of flexible rock. A parametric study is undertaken to investigate the influence of (a) the angle of incidence, (b) the impedance ratio and (c) the canyon narrowness on the steady-state response, by considering in a simplifying way the effects of the dam-canyon interaction. The results demonstrate that the above factors may have a significant effect on …

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The Study Of Xintan Landslide's Sterescopic Monitoring In The Changjiang River Three Gorges, Zhu Ruigeng, Lu Wenxing, Kia Yuanyou Mar 1991

The Study Of Xintan Landslide's Sterescopic Monitoring In The Changjiang River Three Gorges, Zhu Ruigeng, Lu Wenxing, Kia Yuanyou

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

This paper emphatically introduces a new landslide’s stereoscopic monitoring system that was builded in Xintan slope after failed. The movement in the underground different level can be decided through monitoring of surface by the system. The system can provide a basis to master the slope gliding regulartion so that a new prediction method may be worked out in the future.

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Attenuation Of Ground Vibration On Saturated Silt Clay And Rock Bases, Xian-Jian Yang Mar 1991

Attenuation Of Ground Vibration On Saturated Silt Clay And Rock Bases, Xian-Jian Yang

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

By actual measuring and theory analysis, this paper obtains the saturated water mass density and shear modulus of saturated soil , and also the major factor affecting near source attenuation by the mteration of soil skeleton and water , the later also being the major factor affecting far source attenuation. The paper inquiries into the affect of the depth of underground water on the wave propagation. For rock base, as the wave velocity of rock body wave is high and the body wave attenuation much faster than the surface wave does, so the near source attenuated generally faster than the …

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Application Of Fuzzy Set Theory In Option Of Response Spectra, Zhou Xiyuan, Su Jingyu Mar 1991

Application Of Fuzzy Set Theory In Option Of Response Spectra, Zhou Xiyuan, Su Jingyu

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

In order to consider the fuzziness of seismic intensity indecated by zoning map and seismic code in seismic design of structure, an innovative method in option of design spectrum in consideration of fuzziness of regional seismic hazard and site condition is presented herein. The solution of the problem can be divided into two steps: 1. to define and establish a fuzzy set for predicting and judging regional seismic hazard and site condition by applying fuzzy mathematics; 2. further to find out fuzzy vector of design spectrum depending on the fuzzy set of regional seismic hazard and site condition by applying …

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Leak Detection In Large Storage Tanks Using Seismic Boundary Waves, M. Kashi, K. Maser, A. Sotoodehnia Mar 1991

Leak Detection In Large Storage Tanks Using Seismic Boundary Waves, M. Kashi, K. Maser, A. Sotoodehnia

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

This paper describes a field evaluation of a technique for detecting leaks in large above ground storage tanks. The technique detects leaking tank products in the foundation material by sensing anomalies in seismic boundary waves transmitted across the tank bottom. The evaluation consisted of three steps: (1) investigation of surface (Rayleigh) wave anomalies due to surface soil saturation in linear arrays; (2) evaluation of boundary waves propagated across the bottom of typical tanks; and (3) a surface (Rayleigh) wave experiment using tomography to locate velocity changes due to surface soil saturation. The results of these tests have shown that boundary …

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Three Dimensional Wave Propagation Due To Pile Driving, S. Savidis, A. Mitakidis Mar 1991

Three Dimensional Wave Propagation Due To Pile Driving, S. Savidis, A. Mitakidis

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

A very economical and efficient method to construct pile foundations or sheet walls is given by the driving of the pile itself in the case of prefabricated piles or of the steel-sheet pipe for concrete piles in situ and also by the driving of the sheet piles in the case of sheet walls. In spite of its efficiency this method underlies, because of environment protection reasons to certain restrictions that concern the influence of the produced shock waves during the driving procedure to neighboring buildings and constructions. For the theoretical calculation of this influence at first the free-field response of …

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Use Of Rayleigh Modes In Interpretation Of Sasw Test, N. Gucunski, R. D. Woods Mar 1991

Use Of Rayleigh Modes In Interpretation Of Sasw Test, N. Gucunski, R. D. Woods

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

The Spectral-Analysis-of-Surface-Waves (SASW) method is a seismic method for measuring in situ elastic moduli of layered systems, like soils or pavements. The inversion process associated with SASW can be an ambiguous task in certain cases, because a field dispersion curve needs to be matched with an unknown path through a family of theoretically defined curves for an assumed profile. A study of the influence of soil stratification on participation of higher Rayleigh modes in surface wave propagation included the evaluation of theoretical dispersion curves, modal shapes and rates of energy transmission in the horizontal direction. Wave propagation due to oscillations …

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Predicting Vibrations Of Soil And Buildings Excited By Machine Foundations Under Dynamic Loads, Mark Svinkin Mar 1991

Predicting Vibrations Of Soil And Buildings Excited By Machine Foundations Under Dynamic Loads, Mark Svinkin

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

This paper presents a new method that predicts the vibrational effects on existing soil, building and equipment from a designed machine foundation when it will be installed at a specific site. The method requires development of certain experimental data at an industrial site and subsequent computerized data reduction. The results are complete vibro-records at the locations of interest. The basic prerequisite of the suggested method is an experimental determining of impulse responses of soil and structures. The use of this response gives to an engineer a chance to consider heterogeneity and multiformity of soil properties. The accepted assumptions have been …

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The Optimization Principles Of The System "Mass Blast-Protected Structure", Yugeni Borisov, Boris Pishkin Mar 1991

The Optimization Principles Of The System "Mass Blast-Protected Structure", Yugeni Borisov, Boris Pishkin

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

The real work is ideological result of the investigations, which have been carried out for 25 years, on structural dynamics under the seismo-explosive loads, induced by industrial and experimental blasts, simulating natural earthquakes, and on the optimization parameters of drill explosive works in the mining quarrels.

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On The Site Amplification Characteristics In San Francisco Bay Region Due To The 1989 Loma Prieta Earthquake Type Loadings, Kesuke Baba, Yutaka Inoue, Takashi Nishigaki Mar 1991

On The Site Amplification Characteristics In San Francisco Bay Region Due To The 1989 Loma Prieta Earthquake Type Loadings, Kesuke Baba, Yutaka Inoue, Takashi Nishigaki

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

A large earthquake occurred in the Santa Cruz mountains, California, on 17 October 1989, and many structures and facilities in the San Francisco Bay region suffered fatal damage from the seismic motion. In order to evaluate the ground amplification characteristics in the region, the practical method of representing the seismic wave field may be necessary. This paper is concerned with a theoretical analysis and numerical evaluation based on the wave propagation theory to find the dynamic characteristics of the slightly sedimental basin around the San Francisco Bay due to the Loma Prieta earthquake type excitations. Numerical examples of this system …

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General Report Session 5: Soil-Structure Interaction Under Dynamic Loading, E. Kausel, J. Roesset, A. H. Hadjian, J. Bielak, G. R. Martin Mar 1991

General Report Session 5: Soil-Structure Interaction Under Dynamic Loading, E. Kausel, J. Roesset, A. H. Hadjian, J. Bielak, G. R. Martin

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

No abstract provided.

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Aspects Of Seismic Analysis And Design Of Rockfill Dams, George Gazetas, Panos Dakoulas Mar 1991

Aspects Of Seismic Analysis And Design Of Rockfill Dams, George Gazetas, Panos Dakoulas

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

Theoretical methods for estimating the dynamic response and predicting the performance of modern rockfill dams subjected to strong earthquake shaking are reviewed. The focus is on methods accounting for nonlinear material behavior, for 3-Dimensional canyon geometry, and asynchronous base excitation. It is shown that both strong nonlinearities and lack of coherence in the seismic excitation tend to reduce the magnitude of the deleterious "whip-lash" effect computed for tall dams built in rigid-wall narrow canyons. Particular emphasis is accorded to Concrete-Faced Rockfill dams and a case study involving an actually designed dam in a narrow canyon points to some potential problems …

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Classification Of Analysis Methods For Dynamic Soil-Structure Interaction, John P. Wolf Mar 1991

Classification Of Analysis Methods For Dynamic Soil-Structure Interaction, John P. Wolf

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

The various methods to perform soil-structure-interaction analysis are classified. The first classification uses as criterion the behavior (linear or nonlinear) of the structure and of the unbounded soil. The second classification distinguishes between the direct method and the substructure method, which do not necessarily lead to identical results. Within each method, however, the various procedures are mathematically equivalent. In the substructure method the dynamic stiffness representing the interaction forces of the unbounded soil is determined based on the boundary element method in the time or frequency domain. In the latter case various so-called realizations in the time domain are distinguished …

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Geotechnical Lessons Learned From Mexico And Other Recent Earthquakes, Emilio Rosenblueth, Efrain Ovando Mar 1991

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 …

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A Cyclic Shear-Volume Coupling And Pore Pressure Model For Sand, Peter M. Byrne Mar 1991

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 …

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Lnsitu Measurement Of Damping Of Soils, W. P. Stewart, R. G. Campanella Mar 1991

Lnsitu Measurement Of Damping Of Soils, W. P. Stewart, R. G. Campanella

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

The Seismic Cone Penetration Test (SCPT) has been shown to give reasonable results for insitu measurements of shear wave velocity, and this paper extends this work to include measurements of damping. The relevant equations of motion are described, factors affecting amplitude decay are discussed, and the nature of damping is summarized. Consideration is given to some of the practical aspects of pre-processing of signals. Three methods of damping calculation are presented. The first two, attenuation coefficient and modified SHAKE methods, require the application of amplitude corrections, which is not straight-forward, give variable results, and indicate negative damping in a clayey …

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Mechanical Properties Of Cemented Sands Based On Inter-Particle Contact Behavior, Anil Misra, Ching S. Chang Mar 1991

Mechanical Properties Of Cemented Sands Based On Inter-Particle Contact Behavior, Anil Misra, Ching S. Chang

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

The mechanical properties of cemented sands are modelled using a micromechanical approach. The derived model accounts for the packing structure, the particle properties and the contact properties.

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