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Experimental Studies On The Dynamic Behavior Of Soft Clay Ground-Structures Supported By Friction Pile Foundations, N. Mori, T. Kondo Mar 1991

Experimental Studies On The Dynamic Behavior Of Soft Clay Ground-Structures Supported By Friction Pile Foundations, N. Mori, T. Kondo

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

Recently, structures are often sited on a soft ground. So, a friction pile and a floating foundation are considered a possible and promising one. The object of this paper is to study the dynamic behavior of soft clay ground-structure supported by friction pile foundation on the basis of the shaking table test. Major results are as follows; 1) the residual settlement of structure resulting from decreasing the bearing capacity of the ground, wh1ch 1s caused by the accumulation of the excess pore water pressure, is larger than that of ground without structures. 2) The initial shear stress is a main …

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Nonlinear Analysis Of Circular Plates On Nonlinear Foundation, Adel A. Mahmoud, Mohamed A. Nassar, Hazem M. Gheith Mar 1991

Nonlinear Analysis Of Circular Plates On Nonlinear Foundation, Adel A. Mahmoud, Mohamed A. Nassar, Hazem M. Gheith

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

Galerkin's procedure and the modified energy expression of Banerjee are used to obtain the central deflection of circular plates with linearly varying thicknesses, resting on a linear as well as a nonlinear elastic foundation. A new series formula for the deflection has been considered. The accuracy of the method has been tested for clamped plates with movable and immovable ends under uniform static patch loading. Graphical results are drawn for the central deflection for different end conditions, different plate thicknesses and different foundation properties. Comparison of the results are made with other known results and shows a good agreement in …

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Numerical Simulation Of Shaking Table Test By Nonlinear Response Analysis Method, Mamoru Kanatani, Koichi Nishi, Jun-Ichi Touma, Masayuki Ohnami, Hiroyuki Namita Mar 1991

Numerical Simulation Of Shaking Table Test By Nonlinear Response Analysis Method, Mamoru Kanatani, Koichi Nishi, Jun-Ichi Touma, Masayuki Ohnami, Hiroyuki Namita

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

In this paper we described the results or numerical simulation or shaking table test on two dimensional soil-structure interation system to verify an application or newly developed nonlinear response analysis method. This code was a so-called U-W analysis method based on the deformation theory or saturated porous material proposed by Biot and constitutive relations to simulate the nonlinear characteristics or soils were induced by the elasto-plastic theory. Input material constants or soil were decided by referring the data or popular soil element test. Because the properties or soil were heavily dependent on confining pressure, then static and dynamic soil tests …

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Peculiarities Of Soil Structure Interaction In Construction With Artificial Bases, Mark A. Klyachko, Alexander M. Uzdin Mar 1991

Peculiarities Of Soil Structure Interaction In Construction With Artificial Bases, Mark A. Klyachko, Alexander M. Uzdin

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

A technique is suggested to increase seismic resistance of constructions by using alternative artificial bases. Two types of artificial bases are considered: a (consolidated) soil pad and a pile foundation (with or without pile grating). Criteria have been established for the foundation parameters required depending upon the foundation versus construction stiffness ratio. The construction of a consolidated soil pad 3 m thick (h~3m) with deformation module E0 > 30MPa on soils, which are referred, according to the All-Union Building Standard Specifications (SNIP, 1982), to soil category III, is shown to reduce the level of surface accelerations by a factor of …

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Pile Foundation Harmonic Vibration Determined By Wave Difraction On Piles, V. Llyichev, A. Shlyakis Mar 1991

Pile Foundation Harmonic Vibration Determined By Wave Difraction On Piles, V. Llyichev, A. Shlyakis

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

The problems of the low pile foundation vibrations, dynamic loads affecting it together with the horizontal and vertical harmonic forces as well as the wave effect presented by the sum of the elementary harmonics for plane, longitudinal and transversal, horizontally and vertically polarized waves.

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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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Seismic Effect Evaluation For Underground Space & Structures, John G. Z. Q. Wang, Jun Xiong Li Mar 1991

Seismic Effect Evaluation For Underground Space & Structures, John G. Z. Q. Wang, Jun Xiong Li

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

It is stressed in this paper that in a strong earthquake the damages of all the underground structures, chambers or any sort of underground space differed quite a lot from that on the ground surface. Numerous evidences show ground motion attenuates immensely downward with depth. However, the earthquake resistance design for underground structures still ignores this fact and sticks to the criteria of ground structures. As a result, very conservative and exhausting design for underground engineering were caused. Through a series of investigations and based on the comparison between the ground damages and the underground damages of the same site, …

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Seismic Fluidization And Foundation Behavior, R. Richards Jr., M. Budhu, D. G. Elms Mar 1991

Seismic Fluidization And Foundation Behavior, R. Richards Jr., M. Budhu, D. G. Elms

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

Field observations of seismic settlements of foundations on granular soils due to shear flow rather than densification or liquefaction are explained in terms of the concept of seismic fluidization. The theory is briefly reviewed and used to derive seismic bearing capacity factors for shallow foundations from the standard static formulas. The reduction of bearing capacity as accelerations increase triggers incremental settlement whenever the ground acceleration exceeds some critical level whose value depends on the static design factor of safety. The total seismic settlement can be computed for a particular earthquake record by a modified sliding block approach or related to …

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Seismic Response Analysis Of Pile-Supported Structure: Assessment Of Commonly Used Approximations, Toyoaki Nogami, Reed L. Mosher, H. Wayne Jones Mar 1991

Seismic Response Analysis Of Pile-Supported Structure: Assessment Of Commonly Used Approximations, Toyoaki Nogami, Reed L. Mosher, H. Wayne Jones

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

The seismic response of a pile-supported structure is formulated by the approach developed by the first author. Using this formulation, some of the crude approximations frequently used in the seismic response analysis of a soil-pile-structure system are examined. Those involved in the analysis procedure are assessed under the linear elastic condition. A commonly used nonlinear soil model for the dynamic pile response analysis is also assessed. It is found that those approximations routinely used in the analysis procedure and numerical modelling can cause significant errors in the computed response of a pile-supported structure.

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Seismic Response Of Axially Loaded Pile Group, Takaaki Kagawa Mar 1991

Seismic Response Of Axially Loaded Pile Group, Takaaki Kagawa

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

This paper presents a numerically efficient procedure for evaluating seismic responses of an axially loaded pile group. This procedure was used to clarify the impact on pile-group responses of employing different levels of soil-pile compatibility conditions. This study clearly demonstrated that the limitations and shortcomings of adapting relaxed soil-pile compatibility conditions are not negligible for pile groups with relatively small spacing ratios and with soil stiffnesses constant or decreasing with depth.

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Seismic Response Of Floating Piles To Obliquely Incident Waves, Shahid Ahmad, S. M. Mamoon Mar 1991

Seismic Response Of Floating Piles To Obliquely Incident Waves, Shahid Ahmad, S. M. Mamoon

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

The response of single piles under vertically and obliquely incident SH, SV, and P waves is obtained using a hybrid boundary element (BEM) formulation. The piles are represented by compressible beam-column elements and the soil as a hysteretic viscoelastic half-space. A recently developed Green function corresponding to the dynamic Mindlin problem is implemented in the numerical formulation. Exact analytical solutions for the differential equations for the piles under distributed harmonic excitations are used. Treating the half-space as a three-dimensional elastic continuum, the interaction problem is formulated by satisfying equilibrium and displacement compatibility along the pile-soil interface. Solutions adopted for the …

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Soil Structure Interaction Analysis Of A Deeply Embedded Reactor Silo, Margaret Longstreth, Alan Appleford, Frederick F. Tajirian Mar 1991

Soil Structure Interaction Analysis Of A Deeply Embedded Reactor Silo, Margaret Longstreth, Alan Appleford, Frederick F. Tajirian

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

This paper reviews the seismic soil structure interaction (SSI) analysis performed for the Modular High Temperature Gas-cooled Reactor (MHTGR). The large depth to diameter ratio of the silo requires proper modeling of embedment and silo flexibility when evaluating the response of the structure to seismic loads. The carputer program SASSI was used to perform the three dimensional SSI analysis in order to take full advantage of embedment in reducing seismic response. Acceleration response spectra were computed for three soil sites at various points in the silo walls and internal vessels. The results demonstrated the effectiveness of embedment in reducing the …

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Soil-Pile-Structure Interaction During Liquefaction, Shoei Nomura, Yasuhiro Shamoto, Kohji Tokimatsu Mar 1991

Soil-Pile-Structure Interaction During Liquefaction, Shoei Nomura, Yasuhiro Shamoto, Kohji Tokimatsu

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

An analytical method is presented for evaluating dynamic response of soil-pile-structure system during soil liquefaction. The method consists of a modified Penzien's model combined with an effective stress analysis for free-field soil response and a horizontal subgrade reaction model which connects free field response with pile-structure response. Shaking table tests are conducted to study the effectiveness of the proposed procedure. A model sand deposit-pile-structure system is constructed in a large container which can permit shear deformation of the soil. Soil density, pile diameter, pile rigidity, and input motion are controlling variables in the tests. Analysis is made for both liquefied …

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Soil-Structure Interaction At The Waterfront, J. M. Ferritto Mar 1991

Soil-Structure Interaction At The Waterfront, J. M. Ferritto

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

The Navy, forced by its mission to locate at the waterfront, often on loose, saturated cohesionless soils, faces a severe liquefaction threat. Research has been in progress to evaluate the Princeton University Effective Stress Soil Model. This paper discusses that model and presents a validation example study comparing model predictions with a centrifuge experiment.

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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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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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Soil Dynamics In The Offshore, Vijay K. Puri, Shamsher Prakash Mar 1991

Soil Dynamics In The Offshore, Vijay K. Puri, Shamsher Prakash

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

Offshore structures are subjected to the action of wind, wave, sea storms, and earthquakes, and transmit dynamic loads to the underlying soils. This paper highlights the role of soil dynamics in the design of foundations for offshore structures. The motion characteristics associated with storm waves and earthquake loading are discussed. The necessity to consider earthquake load in addition to the environmental loads depending on the location of the offshore structure is discussed. The paper also presents the results of dynamic test on a single pile and a comparison of the observed and predicted response of the Pile.

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A Model For Predicting Liquefaction Induced Displacement, Peter M. Byrne Mar 1991

A Model For Predicting Liquefaction Induced Displacement, Peter M. Byrne

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

A simple model for predicting liquefaction induced displacement is presented. The method is based on a single-degree-of-freedom system that incorporates the post-liquefaction stress-strain response of sand. The key parameters are the residual strength and the limiting shear strain, and considerable data presently exists on these two parameters from correlation with SPT (N1)60 values. Based on this data, liquefaction induced displacements from the model are compared with both field and laboratory measurements. The model predictions are found to be in excellent agreement with the measurements and indicate that liquefaction induced displacements are very sensitive to the density or …

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Assessment Of Dynamic Properties Of Wushantou Dam, J. C. Chern, M. T. Wang, T. S. Lee Mar 1991

Assessment Of Dynamic Properties Of Wushantou Dam, J. C. Chern, M. T. Wang, T. S. Lee

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

Accurate assessment of material properties is essential for a meaningful evaluation of the dynamic behavior of a dam. Comprehensive studies using in- situ measurement and laboratory testing techniques coupled with back calculations of dam responses in recorded motion gives the following conclusions : (1) Response in good agreement with actual motion can be obtained by using appropriate analytical models and material properties; (2) a laboratory test may give reasonable result, but allowance should be made for the effects of strain level, sample disturbance and reconsolidation, especially in loose, non - cohesive soil; (3) in- situ shear wave velocity measurement is …

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Assessment Of Seismic Stability Of Dolphin Pool Slope Of John Hart Dam, J. K. Lou, P. M. Byrne, S. J. Garner, W. F. Marcuson Iii Mar 1991

Assessment Of Seismic Stability Of Dolphin Pool Slope Of John Hart Dam, J. K. Lou, P. M. Byrne, S. J. Garner, W. F. Marcuson Iii

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

The John Hart Dam is in a high seismic risk area. To ensure dam safety, the Dolphin Pool Slope portion of the dam had to be rebuilt. Extensive field investigations and laboratory testing were conducted to obtain representative soil strength parameters for seismic stability analyses and rehabilitation design. Back analysis of the performance of the Dolphin Pool Slope under a 1946 earthquake loading confirmed the strength parameters determined from the field investigation and laboratory testing. Seismic analyses indicated that large zones of the dam could be expected to liquefy under the Maximum Credible Earthquake and, because of uncertainties regarding the …

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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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Comparison Of 2-D And 3-D Dynamic Analysis Of Effective Stress Of Earth Dams, Xhou Jian, Zeng Guoxi, Wu Shiming Mar 1991

Comparison Of 2-D And 3-D Dynamic Analysis Of Effective Stress Of Earth Dams, Xhou Jian, Zeng Guoxi, Wu Shiming

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

Presented in this paper is a comparison between the results of 2-D and 3-D dynamic effective stress analyses of a hypothetical earth dam and two real tailing dams. The study is based on a method of rigorous nonlinear dynamic analysis by taking account the interaction of the fluid and soil phase of the material.

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Consideration Of Earthquake Damage To Earth Dam For Irrigation In Japan, Shigeru Tani Mar 1991

Consideration Of Earthquake Damage To Earth Dam For Irrigation In Japan, Shigeru Tani

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

There are many small earth dams for irrigation called "TAMEIKE" in Japan, Most of them were constructed before modern soil engineering were established on the basis of empirical techniques. Earthquakes in the past gave much damage to these earth dams. This paper surveys damage of earthquake for those remaining on records again, and as for Nipponkai-Chubu Earthquake, detailed investigations such as in-situ test, laboratory test, analysis were made to clarify causes of the damage to earth dams. From the result of survey, the following matters were found; i.e., large damages occur at a high rate on earth dams whose foundation …

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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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Dynamic Response Analysis Of Ash-Retention Dam And Its Earthquake-Resistant Improvement, Nenghui Li, Jiamo Zhu, Zhujiang Shen Mar 1991

Dynamic Response Analysis Of Ash-Retention Dam And Its Earthquake-Resistant Improvement, Nenghui Li, Jiamo Zhu, Zhujiang Shen

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

A nonlinear stress-strain static evaluation model and an equivalent visco-elastic dynamic evaluation model, which can simulate well the static and seismic behaviors of the ash deposit, as well as the methods for analyzing the dynamic response and for improving the earthquake-resistance of the ash-retention dam are presented and illustrated through a practical engineering project in the paper.

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Dynamic Response Of Earth Dam-Foundation System, Lin Gao, Guan Fei Mar 1991

Dynamic Response Of Earth Dam-Foundation System, Lin Gao, Guan Fei

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

A numerical procedure is proposed to analyze the seismic response of structure resting on layered medium. By this approach the effects of the dynamic soil-structure interaction (DSSI) upon the response of earth dam on multi-layered half space subjected to seismic ground motions are studied. The dynamic responses of earth dams on rigid base are also evaluated to compare with those on a flexible homogenous half space. It is noted that great differences may arise between the results of the two cases. To investigate the influence of the truncated size of foundation in horizontal direction on the dynamic response of the …

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Inelastic Seismic Response Of San Fernando And Santa Felicia Dams, Elsa Stara-Gazetas, Ricardo Dobry Mar 1991

Inelastic Seismic Response Of San Fernando And Santa Felicia Dams, Elsa Stara-Gazetas, Ricardo Dobry

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

A simplified method of inelastic seismic analysis of earth dams developed by the authors is used to study the response of the San Fernando and Santa Felicia dams to accelerograms recorded in the 1971 San Fernando Earthquake. The method involves two separate stages. In stage I, the dam is discretized into finite elements and is subjected to horizontal static inertia-like forces; its nonlinear deformation is computed using a plane strain code, while the applied horizontal forces are gradually increased until large enough strains develop in most elements of the dam. The results of this analysis are utilized to derive realistic …

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Modeling Of Observed Permanent Deformation At La Villita Dam, Mohamed Fadel Succarieh, Ahmed-Waeil M. Elgamal, Liping Yan Mar 1991

Modeling Of Observed Permanent Deformation At La Villita Dam, Mohamed Fadel Succarieh, Ahmed-Waeil M. Elgamal, Liping Yan

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

The observed behavior of La Villita dam in Mexico during five different earthquakes which have occurred in the period 1975-1985 is analyzed. Asymmetry observed in the recorded crest acceleration time histories is interpreted to be due to localized stick-slip behavior below the recording instrument. Yield acceleration associated with each stick-slip event can be inferred directly from these crest records. Values of observed average yield accelerations for the November 15, 1975 and September 19, 1985 earthquakes are used to predict the observed horizontal displacements during these earthquakes. Response of other soil systems involving stick-slip deformations during dynamic loading is also briefly …

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Nonstationary Stochastic Seismic Response Analysis For Earth And Rockfill Dams, Wu Zaiguang, Lin Gao, Han Guocheng Mar 1991

Nonstationary Stochastic Seismic Response Analysis For Earth And Rockfill Dams, Wu Zaiguang, Lin Gao, Han Guocheng

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

In this article, the time domain madal analysis technique for evaluating the nonstationary responses of linear systems is combined with the equivalent linearization approach for determining the stationary responses of nonlinear soil structures. A new analysis method is formed and the nonstationary responses of the earth and rockfill dam are calculated. The results from nonstationary analysis are compared with the ones from the stationary computations. The effectiveness of nonstationarity of input and output is investigated and the relevant conclusions are given.

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One- And Two-Dimensional Analysis Of Earth Dams, D. J. Elton, C. F. Shie, T. Hadj-Hamou Mar 1991

One- And Two-Dimensional Analysis Of Earth Dams, D. J. Elton, C. F. Shie, T. Hadj-Hamou

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

Earth dams may experience reduction in shear strength due to seismically induced pore pressures. Such reduction may be large enough to result in large deformations and eventual loss of the reservoir. While the analysis of embankment dams subject to earthquake loading is a complicated process, it is required for evaluation of seismic stability. In particular, the possibility of liquefaction in older, hydraulically-filled or otherwise poorly compacted dams during earthquakes presents a threat that must be addressed. This paper compares two methods of calculating the peak dynamic shear stress (critical to liquefaction evaluation) that occurs in an embankment during an earthquake. …

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