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Articles 23431 - 23460 of 33650
Full-Text Articles in Entire DC Network
Considerations To Damage Patterns In The Marina District During The Loma Prieta Earthquake Based On Rayleigh Wave Investigation, Kohji Tokimatsu, Shoei Nomura, Shinichi Kuwayama, Shuji Tamura, Akio Abe
Considerations To Damage Patterns In The Marina District During The Loma Prieta Earthquake Based On Rayleigh Wave Investigation, Kohji Tokimatsu, Shoei Nomura, Shinichi Kuwayama, Shuji Tamura, Akio Abe
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Rayleigh wave investigation is made in the Marina District to study geotechnical factors controlling the damage patterns in the Loma Prieta earthquake. A portable system has been developed for determining a Rayleigh wave dispersion curve based on the measurements of artificially induced ground vibration or microtremor. Five sites are selected along a line crossing the hydraulic fill zone in which structures and/or buried utilities were significantly damaged. An inverse analysis on the measured dispersion curves results in a cross section of shear wave velocity profiles in the District. Site amplification and liquefaction potential of each site are estimated and discussed …
Contributed Papers: Discussions And Replies, T. Kagawa
Contributed Papers: Discussions And Replies, T. Kagawa
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Investigation Of Sanitary Landfill Slope Performance During Strong Ground Motion From The Loma Prieta Earthquake Of October 17, 1989, Mervin E. Johnson, Joan Lundy, Marshall Lew, Monte E. Ray
Investigation Of Sanitary Landfill Slope Performance During Strong Ground Motion From The Loma Prieta Earthquake Of October 17, 1989, Mervin E. Johnson, Joan Lundy, Marshall Lew, Monte E. Ray
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper evaluates the performance of landfill slopes (refuse fill slopes) during strong ground motion from the October 17, 1989 Loma Prieta Earthquake (M7.1) that affected the Santa Cruz Mountains - San Francisco Bay region. The earthquake's occurrence in a highly populated area that contains the waste disposal sites for this large population offered a unique opportunity to review the performance of slopes on the landfills. Current state and federal regulations require the analysis of stability of landfills under seismic loading. To date, these evaluations have relied on gross simplified assumptions. This paper examines whether these assumptions are reasonably correct. …
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
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 …
Performance Of A Hazardous Waste And Sanitary Landfill Subjected To Loma Prieta Earthquake, Hari D. Sharma, Harish K. Goyal
Performance Of A Hazardous Waste And Sanitary Landfill Subjected To Loma Prieta Earthquake, Hari D. Sharma, Harish K. Goyal
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Loma Prieta Earthquake of October 17, 1989 caused severe damages in the San Francisco Bay Area. Field measurements made during the earthquake and analyses performed to date indicate that bedrock accelerations were amplified to 2 to 3 times in propagating through deep cohesive deposits. In view of this, the performance of a hazardous waste and sanitary landfill subjected to Loma Prieta Earthquake and founded on deep cohesive deposits was evaluated. Analyses indicate that the peak accelerations at the base of the refuse are slightly amplified in propagating through the refuse thicknesses of up to about 50 feet. For higher refuse …
Seismic Design Basis — The Uk Regulatory Position For New Nuclear Reactors, C. M. Patchett, R. J. Stubbs
Seismic Design Basis — The Uk Regulatory Position For New Nuclear Reactors, C. M. Patchett, R. J. Stubbs
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The purpose of this paper is to outline the seismic regulatory requirements relating to the site licensing of new nuclear power installations in the UK, and to describe the background and justification of the seismic design basis level for such installations. It outlines the potential seismic related hazards which should be covered, the factors which are considered important in establishing the level of hazard under consideration, and the techniques which could be used for hazard evaluation. In addition, the paper covers the level of uncertainty associated with the methodology and analytical techniques used in evaluating the seismic hazards.
General Report Session 5: Soil-Structure Interaction Under Dynamic Loading, E. Kausel, J. Roesset, A. H. Hadjian, J. Bielak, G. R. Martin
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.
The Liquefaction Sand Boils In The San Francisco Marina District During The 1989 Loma Prieta Earthquake, J. P. Bardet, M. Kapuskar
The Liquefaction Sand Boils In The San Francisco Marina District During The 1989 Loma Prieta Earthquake, J. P. Bardet, M. Kapuskar
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The paper presents and analyzes the observations of the sand boils that emerged in the Marina District after the Loma Prieta Earthquake of October 17, 1989. The sand boils left behind by liquefaction revealed an old lagoon, the periphery of which had experienced severe damage in the 1906 San Francisco earthquake. The buildings in the Marina District were damaged primarily as the liquefied ground spread laterally along the shoreline of the 1906 lagoon that was filled to host the 1915 Panama-Pacific International Exposition in San Francisco. The present work infers that the sand boils are not random phenomena but instrumental …
Validation Of A Piles Dynamic Analysis Computer Code Through In Situ Tests, R. Bonaz, A. Pecker, T. Duroy, M. Ralljaona, J. P. Touret
Validation Of A Piles Dynamic Analysis Computer Code Through In Situ Tests, R. Bonaz, A. Pecker, T. Duroy, M. Ralljaona, J. P. Touret
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In order to qualify the CLAPIFOU code, which computes the dynamic response of a pile foundation subjected to earthquake or harmonic forces, a test campaign was carried out on piles, to full scale, on pile groups of 2 x 1 piles and 2 x 3 piles on the Plancoet site. The purpose of the study is to compare the results of the experiments and the digital simulations with the computer code. The comparison is good but confirms the need for a good knowledge of the soil's characteristics.
Aspects Of Seismic Analysis And Design Of Rockfill Dams, George Gazetas, Panos Dakoulas
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 …
Assessment Of Liquefaction Potential And Post-Liquefaction Behavior Of Earth Structures: Developments 1981-1991, W. D. Liam Finn
Assessment Of Liquefaction Potential And Post-Liquefaction Behavior Of Earth Structures: Developments 1981-1991, W. D. Liam Finn
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Significant developments in procedures for evaluating liquefaction potential and the post-liquefaction behaviour of earth structures are reviewed for the period 1981-1991. Particular attention is paid to the re-valuation of the liquefaction induced slide in the San Fernando Dam following the 1971 earthquake. The findings of this study have had a major impact on engineering practice.
Classification Of Analysis Methods For Dynamic Soil-Structure Interaction, John P. Wolf
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 …
Constitutive Modelling Of Soils And Computation Of Earthquake Damage And Liquefaction, O. C. Zienkiewicz, M. Pastor, Y. M. Xie
Constitutive Modelling Of Soils And Computation Of Earthquake Damage And Liquefaction, O. C. Zienkiewicz, M. Pastor, Y. M. Xie
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
For realistic modelling oi deformation and collapse of soil structures, an accurate constitutive model for the soil materials is necessary. In this paper we shall show i) how such very successful models can be obtained by the use of generalized plasticity theory; ii) the modification of such models for semi-saturated behavior; and finally iii) How incorporation of such models into a two phase computer program allows the solution of complex problems. A possible mode of failure of the San Fernando dam is included. This paper is divided into three parts according to the above.
State Of The Art Papers: Discussion And Replies, Tzou-Shin Ueng
State Of The Art Papers: Discussion And Replies, Tzou-Shin Ueng
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Effects Of Soil-Structure Interaction For Structures Subjected To Earthquakes, A. S. Veletsos
Effects Of Soil-Structure Interaction For Structures Subjected To Earthquakes, A. S. Veletsos
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
An extended summary is presented of a state-of-the-art report on the subject matter. The report parallels one presented at the Fourth U. S. National Conference on Earthquake Engineering, in May 1990.
Field And Laboratory Determination Of Soil Properties At Low And High Strains, R. D. Woods
Field And Laboratory Determination Of Soil Properties At Low And High Strains, R. D. Woods
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Over the past quarter century many testing methods have been used to determine soil properties for dynamic analysis. Most methods had been established by the time of the writer's review (Woods, 1978), and since then, changes have been mostly evolutionary. Many field and laboratory techniques are represented in papers submitted to this conference and these are reviewed, but additional citations from literature in the intervening years has been included for completeness. No claim is made that all pertinent literature is included, but that most methods of field and laboratory testing methods are covered with representative citations.
Geotechnical Lessons Learned From Mexico And Other Recent Earthquakes, Emilio Rosenblueth, Efrain Ovando
Geotechnical Lessons Learned From Mexico And Other Recent Earthquakes, Emilio Rosenblueth, Efrain Ovando
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper describes the most relevant effects of the September 1985 earthquakes on Mexico City. It discusses the results of recent exploration and research on regional geology, local site conditions and site response analyses, basic soil properties, and observation of actual behavior of soil-foundation-structure systems. The paper shows the impact of these investigations upon new - building code requirements, on general design practice and on the specialist's perception of earthquake behavior of Mexico City's subsoil. Recent earthquakes recorded in and around Mexico City have contributed insight into some of the unresolved questions left after the experience of 1985. Damaging earthquakes …
Preface, Shamsher Prakash
Preface, Shamsher Prakash
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Disclaimer, Shamsher Prakash
Disclaimer, Shamsher Prakash
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Conference Schedule, Multiple Authors
Conference Schedule, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Welcoming Remarks, Joseph E. Minor
Welcoming Remarks, Joseph E. Minor
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Banquet Speeches And Remarks, Shamsher Prakash, Shiming Wu, Kenji Akino, John T. Park, Joseph H. Senne, Jeanne L. Senne
Banquet Speeches And Remarks, Shamsher Prakash, Shiming Wu, Kenji Akino, John T. Park, Joseph H. Senne, Jeanne L. Senne
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Errata, Multiple Authors
Errata, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
A Cyclic Shear-Volume Coupling And Pore Pressure Model For Sand, Peter M. Byrne
A Cyclic Shear-Volume Coupling And Pore Pressure Model For Sand, Peter M. Byrne
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A two parameter incremental shear-volume coupling equation is presented for sand. The equation is based upon experimental data and gives predictions that are in excellent agreement with data over a range of relative densities and stress conditions. Empirical expressions for the two parameters based on incorporated in a simple shear pore pressure element model and the predictions of the model are compared with both saturated undrained cyclic strain and cyclic load tests. It is found that, provided a threshold strain is incorporated, the model predictions are in very good agreement with the laboratory data over a wide range of stress …
An Estimation Of Dynamic Properties Of Soils From Block Vibration Tests, V. D. Miglani
An Estimation Of Dynamic Properties Of Soils From Block Vibration Tests, V. D. Miglani
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The paper presents departures that have to be made in the conduct of block vibration tests from the standard method and in the analysis of test data under unusual conditions. Disturbed soil condition under an edge of the block leads to occurrence of double peaks in amplitude versus frequency curves from vertical vibration test. Two methods have been devised to analyze such double peaks. The first method assumes a correlation between dynamic coefficients. The dynamic properties can be predicted from non-dimensional curves of correction factor versus ratio of effective base area. The second method assumes linear variation of coefficient of …
Behavior Of Geotextile Reinforced Soil Under Cyclic Loading, G. Venkatappa Rao, G. P. Singh, K. K. Gupta
Behavior Of Geotextile Reinforced Soil Under Cyclic Loading, G. Venkatappa Rao, G. P. Singh, K. K. Gupta
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The vast potential of geotextiles for separation (reinforcement in pavements and rail roads is yet to be fully exploited in India, despite the initial successful trials. This is partly due to the lack of sufficient test data on the behavior under repetitive loading of indigenous geotextiles. This paper reports typical triaxial test results on reinforced and unreinforced specimens before and after cyclic loading. The reinforcement used is a needle punched polypropylene geotextile manufactured in India. The results reported include strength before and after cyclic loading (cyclic loading under both drained and undrained conditions), modulus of resilience and plastic strain. Limited …
Cyclic Non-Linear Constitutive Equations For Sands, T. Doanh
Cyclic Non-Linear Constitutive Equations For Sands, T. Doanh
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A series of triaxial cyclic tests are performed on Hostun sand; each test undergoes several two-way, strain-controlled cyclic loadings under drained conditions. The purpose of these tests is to investigate the behavior of this sand under complex loadings. This paper extends the previous works during the last years, and aims at showing that the non-linear incremental constitutive equations can describe the behavior of saturated sand subjected to various stress loadings in drained conditions.
Cyclic Undrained Behavior Of Saturated Sand Under Monotonic Loading, Hiroshi Matsuzawa, Masahiro Sugimura
Cyclic Undrained Behavior Of Saturated Sand Under Monotonic Loading, Hiroshi Matsuzawa, Masahiro Sugimura
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In order to investigate undrained behavior of saturated sand, three types of undrained triaxial tests were performed for saturated Toyoura sand, i.e., cyclic loading test with (DTU-test) and without (DU-test) constant initial shear stress and tests in which constant rate axial strain and cyclic axial stress were applied to a specimen simultaneously (DCU-test). In DCU-tests, three types of failure were observed, i.e.; 1) perfectly liquefied in the case of relatively loose sand, 2) initially liquefied, but shear failure was induced after strength recovery for succeeding loading in the case of relatively dense sand, and 3) shear failure was induced without …
Degradation Of Saturated Clays After Cyclic Loading, Tamotsu Matsui, Mohamed A. Bahr, Nobuharu Abe
Degradation Of Saturated Clays After Cyclic Loading, Tamotsu Matsui, Mohamed A. Bahr, Nobuharu Abe
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper presents a part from a series of tests performed to evaluate the static shear behavior of normally consolidated and over-consolidated clays after cyclic loading effect. The results demonstrated that the static undrained stress-strain behavior of these types of clays was affected by their relative stiffness. Based on the equivalent over-consolidation hypothesis and the experimental results it was able to construct the shear characteristics degradation relationships for the normally consolidated clays. The predicted results were compared with the measured test data and their well agreement was confirmed.
Development Of Shear Modulus Reduction Curves Based On Lotung Downhole Ground Motion Data, C.-Y. Chang, Y. K. Tang, C. M. Mok, H. T. Tang, M. S. Power, J. C. Stepp
Development Of Shear Modulus Reduction Curves Based On Lotung Downhole Ground Motion Data, C.-Y. Chang, Y. K. Tang, C. M. Mok, H. T. Tang, M. S. Power, J. C. Stepp
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In this study, equivalent shear moduli (or shear-wave velocities) and their variations with shearing strain at the Lotung seismic experiment site were back-calculated from recorded downhole array ground motions. Ground motion data for various levels of shaking (peak ground surface accelerations ranging from 0.03g to 0.21g) recorded during seven earthquakes were used in the analyses. Results show that downhole array ground motion data can be used to infer in-situ dynamic soil properties over a wide strain range.