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2001

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Articles 871 - 900 of 1795

Full-Text Articles in Engineering

Evaluation Of The Shear Modulus In Models For Shallow-Foundation Dynamics Within The Elastic Domain, Jean-Louis Chazelas Mar 2001

Evaluation Of The Shear Modulus In Models For Shallow-Foundation Dynamics Within The Elastic Domain, Jean-Louis Chazelas

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

The aim of this presentation is to examine the relationship of the equivalent homogeneous shear moduli used in impedance models with stresses under the footing, through the use of scaled models in the centrifuge and an impact loading. The analysis of time and frequency vertical responses of footings reveals that reflections on the boundaries are negligible. The frequency response of a series of circular and square footings is shown to be rather easily-fitted with Wolf’s models for foundations on an infinite half-space with reasonably consistent parameters for masses, damping and shear moduli. The damping is nearly constant, yet significantly lower …

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The Observed Building Damage Associated With Fault Movement In 1999 Chi-Chi (Taiwan) Earthquake, H. W. Yang, S. M. Lin, Daniel Chu Mar 2001

The Observed Building Damage Associated With Fault Movement In 1999 Chi-Chi (Taiwan) Earthquake, H. W. Yang, S. M. Lin, Daniel Chu

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

The Chi-Chi earthquake caused severe damage of many buildings primarily due to surface faulting and ground shaking. It has been reported that about 10,000 buildings collapsed and 8000 buildings suffered varying degrees of damage. The observed damage to buildings resulted from many factors that include ground movement, acceleration, design code, and construction quality. The damage to buildings near the fault was attributed primarily to the ground movement. One observed phenomenon is that the damage in the up-lifted side (east side) of the rupture fault was much more severe than the opposing side (west side) of the fault mainly due to …

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Relevant Aspects Of Applying Soil Improvement Method For Liquefaction Mitigation — Case Study, Valtko Sesov, Kosta Talaganov Mar 2001

Relevant Aspects Of Applying Soil Improvement Method For Liquefaction Mitigation — Case Study, Valtko Sesov, Kosta Talaganov

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

This paper presents some experience gathered during the implementation of soil improvement in founding of a residential-business complex located in seismically prone area. The previously performed field and laboratory geomechanical tests proved that the geotechnical medium of the location was characterized by a high heterogeneity of soil materials with predominant presence of layers of low strength-deformability characteristics. A high underground water level and layers of fine-grained uniform sands susceptible to dynamic instability under seismic effects were observed. Such an unfavorable geotechnical situation of the given location imposed the need of improving of the natural foundation soil. The most favorable and …

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Earthquake Assessment Of Critical Structures For Route Us 60 Missouri, Ronaldo Luna, Genda Chen, Yulman Munaf, Huimin Mu, Shamsher Prakash, Paul Michael Santi, Tom Fennessey, Dave Hoffman Mar 2001

Earthquake Assessment Of Critical Structures For Route Us 60 Missouri, Ronaldo Luna, Genda Chen, Yulman Munaf, Huimin Mu, Shamsher Prakash, Paul Michael Santi, Tom Fennessey, Dave Hoffman

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

The Missouri Department of Transportation initiated a study of that segment of Route US 60 that has been officially designated as “emergency vehicle priority access”. The objectives were to establish a current subsurface and earthquake design geographic information systems (GIS) database for the designated US 60 corridor, and to conduct detailed earthquake assessments at two critical bridge sites along US 60. Databases have been established for current subsurface and earthquake data for the US Route 60 corridor in Butler, Stoddard and New Madrid Counties. These databases serve as the beginning of a larger regional or statewide database for future development …

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A Laboratory And Numerical Investigation On A Post-Seismic Induced Settlement In Southern Italy, Lucio Olivares, Francesco Silvestri Mar 2001

A Laboratory And Numerical Investigation On A Post-Seismic Induced Settlement In Southern Italy, Lucio Olivares, Francesco Silvestri

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

In the years following the Irpinia earthquake (1980), the old town of Bisaccia, located on a conglomerate hill overlaying a thick clay formation, experienced a slow subsidence revealed by topographic measurements. The paper summarizes the results of the numerical simulations of the effects of the Irpinia earthquake on the Bisaccia hill. The input data for the analyses were the acceleration records of the seismic event at the site and the geotechnical characterization obtained by dynamic and cyclic torsional tests on undisturbed clay shales. The analyses confirmed the hypothesis that the town subsidence was caused by a post-cyclic soil re-compression as …

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Geotechnical Characterization Of Success Dam For A Dam Safety Earthquake Engineering Evaluation, Matthew G. Allen, John S. Nickell, Steve G. Sherer Mar 2001

Geotechnical Characterization Of Success Dam For A Dam Safety Earthquake Engineering Evaluation, Matthew G. Allen, John S. Nickell, Steve G. Sherer

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

Success Dam, primarily a flood control and water conservation structure owned and operated by the US Army Corps of Engineers, lies in Seismic Zone 3. During construction of the dam, the impervious core trench was excavated to either weathered bedrock or older alluvium. However, the pervious outer zones of the embankment were constructed on existing in-situ materials, including recent alluvium, that were only minimally prepared. In 1992, the Corps of Engineers concluded that the state-of-practice allowed for a better understanding of the seismic response of the alluvial soils than was previously available, and a study to update the seismic stability …

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Analysis Of Some Downhole Acceleration Records From "Central De Abasto Oficinas" Site At Mexico City, Hernán Martínez-Carvajal, Víctor M. Taboada-Urtuzuástegui, Miguel P. Romo Mar 2001

Analysis Of Some Downhole Acceleration Records From "Central De Abasto Oficinas" Site At Mexico City, Hernán Martínez-Carvajal, Víctor M. Taboada-Urtuzuástegui, Miguel P. Romo

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

The surface and downhole accelerations records of “Central de Abasto Oficinas (CAO)” array at Mexico City, have been analyzed to determine the soil stiffness as a function of shear strain amplitude. The 09/10/95 seismic event (NS component) has been used for this purpose. The shear stress-strain histories have been evaluated directly from the field downhole acceleration records, employing a technique of system identification, and used to obtain the variation of shear modulus with shear strain amplitude. A shear-beam model, calibrated by the identified properties, is found to represent the site dynamic response characteristics. The results have been compared with values …

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Attenuation Of Peak Ground Acceleration With Distance Of The June 15, 1999, Tehuacán, México, Earthquake, Rudolfo B. Sancio, J. M. Mayoral, R. E. S. Moss, J. M. Pestana, R. B. Seed, J. D. Bray Mar 2001

Attenuation Of Peak Ground Acceleration With Distance Of The June 15, 1999, Tehuacán, México, Earthquake, Rudolfo B. Sancio, J. M. Mayoral, R. E. S. Moss, J. M. Pestana, R. B. Seed, J. D. Bray

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

A seismic event of moment magnitude 7.0 struck the central region of Mexico on June 15, 1999 at 15:41 hrs (local time) between the states of Puebla and Oaxaca. The epicenter of the earthquake was located approximately 20 km to the south-southeast of the town of Tehuacán, Puebla and 55 km to the northeast of Huajuapan de León, Oaxaca. A reconnaissance team consisting of a group of researchers from the University of California at Berkeley (UCB) and the Autonomous University of Mexico (UNAM) visited the area and gathered some preliminary information on the geotechnical aspects of this earthquake. This paper …

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Numerical Analysis Of Saturated Sand Under Dynamic Loads, Jae-Soon Choi, Inn-Joon Park, Soo-Il Kim Mar 2001

Numerical Analysis Of Saturated Sand Under Dynamic Loads, Jae-Soon Choi, Inn-Joon Park, Soo-Il Kim

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

In this study, the behavior of reclaimed soils including the effects of excess pore water pressure and the loss of strength under dynamic loads or earthquakes are investigated and simulated. The constitutive model based on the disturbed state concept (DSC) is introduced and DSC-DYN2D program is utilized in a numerical analysis. In the laboratory test, quasi-static and cyclic triaxial tests were carried out to determine parameters for the numerical analysis. Field tests were executed in Inchon International Airport with a 10 tons hydraulic hammer. In the field test, the data of dynamic loads and excess pore water pressure were measured …

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Non-Linear Modeling Of Dip-Slip Faults Using Applied Element Method, Pradeep Kumar Ramancharla, Kimiro Meguro Mar 2001

Non-Linear Modeling Of Dip-Slip Faults Using Applied Element Method, Pradeep Kumar Ramancharla, Kimiro Meguro

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

On observing the recent big earthquakes that have occurred in Turkey (M.7.4, 1999.8.17) and Taiwan (M.7.3, 1999.9.21), it is understood that the differential ground displacement is also responsible for the failure of structures. Now, it is understood that there is a need to channelize the research interests to study the failure propagating mechanism through the soil deposit. Numerous researchers have attempted to study this phenomenon through, experiments for understanding the effects of seismic fault mechanism and soil deposit parameters on surface deformation characteristics. However, from the widespread damage caused by the recent events, it is now clear that the earthquakes …

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Liquefaction Studies On Guaratuba Bay Erosion, Arinos Xavier Tavares Mar 2001

Liquefaction Studies On Guaratuba Bay Erosion, Arinos Xavier Tavares

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

The paper presents the studies conducted to explain the erosion process which occurred at the Guaratuba bay coast located in the South of Brazil [Tavares, 1989]. The subsoil in the area is composed mainly of be clean sand. The erosion occurred as a result of the liquefaction of the sandy subsoil and is described in the text. Several buildings, including the City Hall, and some streets near the affected area were sunk into the subsoil. The phenomenon took place on the 23rd of September of 1968. In the years of 1998, 1999 to March, 2000, new studies were performed to …

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Focal Mechanism Analyses Of The 1993, 1995 Northern Red Sea Sequences Activity, Abdulaziz A. S. Fayez, Nassir S. Al-Arifi Mar 2001

Focal Mechanism Analyses Of The 1993, 1995 Northern Red Sea Sequences Activity, Abdulaziz A. S. Fayez, Nassir S. Al-Arifi

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

On August 3rd, 1993, a sequence of earthquakes began in the central part of the Gulf of Aqaba, northern Red Sea at the Aragonese Deep. The largest event (MD = 5.5) on August 3rd had an origin time of 12:42:43.22 GMT, a latitude of 28.628° N and longitude 34.644° E. This event was followed by more than 15000 events greater than 2 magnitude with some felt earthquakes. On the same spot, another sequence of earthquakes began late 1995. The largest event (MD = 5.9) on November 22 had an origin time of 04:15:12.30 GMT, a latitude of 28.8° …

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General Report — Session 2: Wave Propagation, Engineering Vibrations And Solutions, Vibrations Of Machine Foundations, Blast, Traffic And Construction Vibrations, Vibration Absorption, M. Hesham El Naggar, D. K. Baidya, Dong-Soo Kim, George M. S. Manyando, Nii K. Allotey Mar 2001

General Report — Session 2: Wave Propagation, Engineering Vibrations And Solutions, Vibrations Of Machine Foundations, Blast, Traffic And Construction Vibrations, Vibration Absorption, M. Hesham El Naggar, D. K. Baidya, Dong-Soo Kim, George M. S. Manyando, Nii K. Allotey

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

No abstract provided.

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General Report — Session 4: Soil Amplification; Liquefaction And Ground Failures; Seismic Studies Of Loma Prieta, Northridge, Kobe, And Other Recent Earthquakes; Spatial Liquefaction, Vlad Perlea, J. Ludwig Figueroa, J. Scott Ellington, Anil Misra, S. M. Mir Mohammad Hosseini, Susumu Yasuda Mar 2001

General Report — Session 4: Soil Amplification; Liquefaction And Ground Failures; Seismic Studies Of Loma Prieta, Northridge, Kobe, And Other Recent Earthquakes; Spatial Liquefaction, Vlad Perlea, J. Ludwig Figueroa, J. Scott Ellington, Anil Misra, S. M. Mir Mohammad Hosseini, Susumu Yasuda

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

No abstract provided.

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The 1999 Athens (Greece) Earthquake: Energy And Duration- Related Response Spectral Characteristics Of Different Site Conditions, P. K. Koliopoulos, B. N. Margaris Mar 2001

The 1999 Athens (Greece) Earthquake: Energy And Duration- Related Response Spectral Characteristics Of Different Site Conditions, P. K. Koliopoulos, B. N. Margaris

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

An earthquake of September 7, 1999 (M5.9) has occurred in the Athens (Attika) area and was felt in almost all central Greece. The earthquake caused a lot of damage and extensive loss of life. The most damaged region is located within a distance of 10 km from the epicenter and numerous modem buildings and industrial facilities collapsed. The accelerograms, which have been recorded during the main event, are processed and compared with the empirical predictive relations proposed for Greece. For each record, the bracketed and significant duration as well as various energy-related measures are estimated. The correlation of these measures …

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General Report — Session 3: Engineering Seismology And Local Site Effects, Ronald C. Chaney, Dennis Hiltunen, Jonathan Stewart, Madan Karkee, Vladimir Sokolov Mar 2001

General Report — Session 3: Engineering Seismology And Local Site Effects, Ronald C. Chaney, Dennis Hiltunen, Jonathan Stewart, Madan Karkee, Vladimir Sokolov

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

No abstract provided.

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General Report — Session 8: Seismic Analysis And Retrofit Of Foundations Of Bridges And Other Sub-Structures, Seismic Retrofit Projects And Procedures In California, Ronaldo Luna, Genda Chen Mar 2001

General Report — Session 8: Seismic Analysis And Retrofit Of Foundations Of Bridges And Other Sub-Structures, Seismic Retrofit Projects And Procedures In California, Ronaldo Luna, Genda Chen

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

No abstract provided.

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General Report — Session 10: Case Histories Of Geotechnical Earthquake Engineering, Failures, And Geotechnical Analysis Of Recent Earthquakes, Jonathan D. Bray, Marshall Lew, Yung-Show Fang, H. W. Yang, Masayuki Hyodo, Shigeru Tani Mar 2001

General Report — Session 10: Case Histories Of Geotechnical Earthquake Engineering, Failures, And Geotechnical Analysis Of Recent Earthquakes, Jonathan D. Bray, Marshall Lew, Yung-Show Fang, H. W. Yang, Masayuki Hyodo, Shigeru Tani

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

No abstract provided.

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Deep Foundations In Liquefiable Soils: Case Histories, Centrifuge Tests And Methods Of Analysis, W. D. Liam Finn, T. Thavaraj Mar 2001

Deep Foundations In Liquefiable Soils: Case Histories, Centrifuge Tests And Methods Of Analysis, W. D. Liam Finn, T. Thavaraj

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

This paper describes the performance of pile foundations in liquefied soils. Two different aspects of pile response are considered, seismic response to earthquake shaking and response to lateral spreading when the liquefied ground is sloping. The case histories show that piles can be designed economically to resist large lateral displacements and that most of the reported examples of damage from lateral spreading involve weak piles with little reinforcement which were installed to control vertical settlements and were not designed to be moment resistant. A quasi-3-D continuum method is presented for dynamic effective stress response analysis of pile groups in liquefiable …

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Liquefaction Assessment And Lateral Spreading In Nantou, Taiwan, P. S. Lin, C. W. Chang, C. C. Hseih, S. Y. Lai, S. Y. Lin Mar 2001

Liquefaction Assessment And Lateral Spreading In Nantou, Taiwan, P. S. Lin, C. W. Chang, C. C. Hseih, S. Y. Lai, S. Y. Lin

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

On September 21, 1999, Taiwan was struck by an earthquake, called Chi-Chi earthquake, one of the largest in 100 years. The epicenter was located 12.5 km west of the Sun Moon Lake (Northern Latitude 23.85°) Eastern Longitude 120.78°), with focal depth of 8 km, and magnitude of Mw=7.6 (USGS). This earthquake caused heavy casualties and severe property damages around central Taiwan. It was found that this earthquake resulted in sand boiling, differential settlement on the ground and lateral spreading around part of the Maolou River bank in Nantou City. Field investigation, geological exploration and in situ tests, which …

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Seismic Design Of Mixed And Hazardous Waste Landfills, Edward Kavazanjian Jr., Neven Matasovic Mar 2001

Seismic Design Of Mixed And Hazardous Waste Landfills, Edward Kavazanjian Jr., Neven Matasovic

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

Due to the absence of federal criteria, seismic design and performance criteria for mixed and hazardous waste landfills are generally developed on a project-specific basis, supplemented by state and project-specific standards. In developing project-specific criteria, the federal Subtitle D standards for seismic design of municipal solid waste landfills are often used as a minimum standard for mixed and hazardous waste facilities. Seismic performance standards are also usually developed on a project-specific basis, employing either a “withstand without harmful discharge” or a “withstand without damage” performance standard, depending on the certainty of continuing aftercare. Quantitative criteria established to demonstrate compliance with …

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Risk Analysis In Geotechnical And Earthquake Engineering, State-Of-The-Art Practice Of Embankment Dams, D. N. D. Hartford Mar 2001

Risk Analysis In Geotechnical And Earthquake Engineering, State-Of-The-Art Practice Of Embankment Dams, D. N. D. Hartford

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

Despite a proliferation of papers on quantitative risk analysis for dams during the past twenty years, risk analysis has not found widespread application in dam safety practice. Recent experience suggests that, despite a great deal of enthusiasm in the 1990’s, the professional opinion concerning the usefulness of risk analysis in dam safety practice is almost as divided now as it was in the early 1980’s. This paper presents an account of the history and development of risk analysis ln dam safety practice in the field of geotechnical earthquake engineering since its inception in the early 1960’s to September 2000. Against …

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Investigation Of Seismic Soil-Footing Interaction By Large Scale Tests And Analytical Models, Ezio Faccioli, Roberto Paolucci, Guillermo Vivero Mar 2001

Investigation Of Seismic Soil-Footing Interaction By Large Scale Tests And Analytical Models, Ezio Faccioli, Roberto Paolucci, Guillermo Vivero

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

Recent experimental and analytical research on seismic behavior of shallow foundations is illustrated. The most significant results on the seismic bearing capacity of footings with pseudo-static approaches are reviewed first, including an analytical formula recently proposed for the new version of the “seismic” Eurocode 8. Afterwards, we present the salient experimental results of large-scale cyclic tests of a shallow foundation model (1m x 1m in plan) resting on a large volume of sand, with relative densities 45% and 85%, discussing them in detail. Under earthquake-like cyclic loading, with peak values close to the pseudo-static failure limit, significant permanent settlement and …

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Review Of Soil And Topography Effects In The September 7, 1999 Athens (Greece) Earthquake, George D. Bouckovalas, George Kouretzis Mar 2001

Review Of Soil And Topography Effects In The September 7, 1999 Athens (Greece) Earthquake, George D. Bouckovalas, George Kouretzis

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

The earthquake that hit Athens, Greece on September 7, 1999 was an unexpected disaster. It originated from a previously unknown seismotectonic structure, at about 18 km to the west of the historical center, and left behind 143 casualties, about 100,000 homeless and 100 totally collapsed buildings. On the other hand, it provided a number of reliable strong motion recordings and well-defined patterns of damage at sites with known geological and geotechnical conditions. Evaluation of this information shows that the very stiff soils of the Athens basin amplified seismic ground motion by an average of 40% compared to nearby outcropping soft …

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General Report — Session 5: Stability And Displacement Performance Of Slopes, Landfills, And Earth Dams Under Earthquakes, Donald G. Anderson, Allen M. Yourman, Hormoz Modaressi, Azm S. Al-Homoud, Robert C. Lo Mar 2001

General Report — Session 5: Stability And Displacement Performance Of Slopes, Landfills, And Earth Dams Under Earthquakes, Donald G. Anderson, Allen M. Yourman, Hormoz Modaressi, Azm S. Al-Homoud, Robert C. Lo

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

No abstract provided.

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General Report — Session 11: Seismic Zonation And Microzonation, Earthquake Risk Assessment, And Earthquake Risk Management, M. S. Power, G. Estrada, S. Zlatovic, L. Matesic, F. R. Bickner, C. Cardona, F. H. Swan Mar 2001

General Report — Session 11: Seismic Zonation And Microzonation, Earthquake Risk Assessment, And Earthquake Risk Management, M. S. Power, G. Estrada, S. Zlatovic, L. Matesic, F. R. Bickner, C. Cardona, F. H. Swan

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

No abstract provided.

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Disclaimer, Shamsher Prakash Mar 2001

Disclaimer, Shamsher Prakash

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

No abstract provided.

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Steering Committee, Shamsher Prakash Mar 2001

Steering Committee, Shamsher Prakash

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

No abstract provided.

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Organizing Committee, Shamsher Prakash Mar 2001

Organizing Committee, Shamsher Prakash

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

No abstract provided.

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Recent Studies On Seismic Centrifuge Modeling Of Liquefaction And Its Effects On Deep Foundations, Ricardo Dobry, Tarek Abdoun Mar 2001

Recent Studies On Seismic Centrifuge Modeling Of Liquefaction And Its Effects On Deep Foundations, Ricardo Dobry, Tarek Abdoun

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

The effects of liquefaction on deep foundations are very damaging and costly, and they keep recurring in many earthquakes. The first part of the paper reviews the field experience of deep foundations affected by liquefaction during earthquakes in the last few decades, as well as the main lessons learned. The second part of the paper presents results of physical modeling of deep foundations in the presence of liquefaction conducted mostly in the U.S. and Japan in the 1990’s, with emphasis on the work done by the authors and others at the 100 g-ton RPI centrifuge. Centrifuge models of instrumented single …

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