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Articles 5071 - 5100 of 7869

Full-Text Articles in Civil and Environmental Engineering

Behavior And Damage Of Dams Under The 1993 Big Earthquakes In Japan, Tomoya Iwashita, Akira Nakamura, Nario Yasuda Apr 1995

Behavior And Damage Of Dams Under The 1993 Big Earthquakes In Japan, Tomoya Iwashita, Akira Nakamura, Nario Yasuda

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

By analyses of the acceleration records at dams during the two big earthquakes which hit in Hokkaido of Japan in 1993, the maximum acceleration at damsite rock, the maximum acceleration amplification ratios at crest and the natural periods of dam bodies were evaluated and were compared the results with empirical equations. Damage to the dams was described, and the mechanism of the deformations was examined.

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Some Aspects Of Liquefaction Assessment Of Duncan Dam, V. S. Pillai, R. A. Stewart, H. D. Plewes Apr 1995

Some Aspects Of Liquefaction Assessment Of Duncan Dam, V. S. Pillai, R. A. Stewart, H. D. Plewes

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

A comprehensive program of field, laboratory and analytical investigations was carried out to assess the potential for liquefaction of the foundation soils and seismic stability of Duncan Dam. Duncan Oam is located on Duncan River in southeastern British Columbia, Canada. The 39 m high zoned earthfill dam is founded on a thick sequence of sands, silts and gravels. The liquefaction studies were carried out in two phases between 1988 and 1992 to characterize in detail the engineering properties of the foundation soils; and to assess its potential for triggering liquefaction, and the post liquefaction stability and deformation of the dam …

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Earthquake-Induced Lateral Displacement Of A Landfill, Tzyy-Shiou Chang, Bao-Zhu Wei, Kuo-Ping Chang, Kenneth M. Hall Apr 1995

Earthquake-Induced Lateral Displacement Of A Landfill, Tzyy-Shiou Chang, Bao-Zhu Wei, Kuo-Ping Chang, Kenneth M. Hall

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

In the wake of stability failure of the Kettleman Hills Waste Repository on March 19, 1988, the stability of landfill mass in earthquake-prone areas has become an important issue in the community. Based on a proposed landfill site in the Memphis, Tennessee area, this paper studies behaviors of landfills under various landfill and earthquake conditions (height and slope angle of the landfill, average unit weight of the landfill refuse, and peak acceleration and time duration of bedrock motion) by calculating lateral displacements induced by a design earthquake. Results indicate that lateral displacement of a landfill is proportional to the slope …

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Ground Motion Amplification Using Microseisms, John M. Ferritto Apr 1995

Ground Motion Amplification Using Microseisms, John M. Ferritto

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

This paper discusses the use of microseism measurement as a tool to predict local site amplification. Systems analysis techniques can be applied to the microseism data to validate site properties used in wave propagation analysis. Spectral ratio was found to be inversely related to peak rock velocity for soft sites. Microseisms can be used on a normalized basis to extend spatial response information.

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Seismic Response Of A Linear, 2-D Model Of The Marina District, Bin Zhang, A. S. Papageorgiou Apr 1995

Seismic Response Of A Linear, 2-D Model Of The Marina District, Bin Zhang, A. S. Papageorgiou

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

The recorded response of the Marina District of the City of San Francisco to an aftershock of the 1989 Loma Prieta earthquake is simulated using a two-dimensional model of the sedimentary deposits. Even though the response of the Marina is truly three-dimensional, the two-dimensional model successfully captures some important aspects of the response and consequently may be useful for predicting strong ground motion in the Marina District for engineering applications.

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Use Of Microtremors For The Estimation Of Ground Vibration Characteristics, Mehedi A. Ansary, Mitsuyoshi Fuse, Fumio Yamazaki, Tsuneo Katayama Apr 1995

Use Of Microtremors For The Estimation Of Ground Vibration Characteristics, Mehedi A. Ansary, Mitsuyoshi Fuse, Fumio Yamazaki, Tsuneo Katayama

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

Short-period micro tremor array observation is conducted at five sites in the Tokyo Metropolitan area of Japan. The Fourier spectra of horizontal and vertical components show variations in time, but their ratio is stable for different time instants. The characteristics of the amplitude ratio are similar to that of Rayleigh wave and the period correspond to the peak ratio correspond to the predominant period of the sites for shear wave propagation. A parametric study for two-layered models reveals that the peaks for Rayleigh wave and shear wave are close for the ground having large impedance ratio. The F-K spectrum analysis …

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Effect Of Building Configuration On Seismic Response Parameters, A. S. Elnashai, M. M. Soliman Apr 1995

Effect Of Building Configuration On Seismic Response Parameters, A. S. Elnashai, M. M. Soliman

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

To contribute to the available information on the inelastic performance of irregular structures, the investigation of four building characteristics on it seismic response was initiated. These characteristics are column height, beam-to-column capacity, stiffness distribution in elevation and set-backs and non-symmetric elevation configuration. The parametric study presented in the paper is intended to be more indicative than comprehensive, since simplifications in the modeling of structures were necessary.

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Discussions And Replies — Session Vii, Multiple Authors Apr 1995

Discussions And Replies — Session Vii, Multiple Authors

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

No abstract provided.

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Influence Of Ground Motion Variability On Design Spectra In Areas Of Low To Moderate Seismicity, Z. A. Lubkowski, J. W. Pappin Apr 1995

Influence Of Ground Motion Variability On Design Spectra In Areas Of Low To Moderate Seismicity, Z. A. Lubkowski, J. W. Pappin

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

This paper examines the sensitivity of uniform hazard response spectra to the variability of the ground motion attenuation in areas of low to moderate seismicity. The variabilities of a number of published attenuation relationships are examined. Many of these relationships show that the standard deviation tends to increase as the natural period increases and some show a tendency for the standard deviation to reduce as the earthquake magnitude increases. These published works tend to be derived from earthquake data for areas of high seismicity and therefore the paper includes a critical review of what values of standard deviation are appropriate …

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Discussions And Replies — Session Viii, Multiple Authors Apr 1995

Discussions And Replies — Session Viii, Multiple Authors

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

No abstract provided.

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On Association Of Seismic Lineaments And Stress Patterns Of The Southeastern United States: Criteria Of Failure, A. A. Nowroozi Apr 1995

On Association Of Seismic Lineaments And Stress Patterns Of The Southeastern United States: Criteria Of Failure, A. A. Nowroozi

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

It is generally agreed that shallow focus, low magnitude, crustal earthquakes are caused by a sudden frictional movement on preexisting faults, and that the orientation of the faults may be delineated by locations of past earthquakes. The spatial distribution of a large number of epicenters in the Southeastern region of the United States may be interpreted in terms of many linear patterns. These patterns indicate weak fracture zones which are conveniently called seismic lineaments. Orientations of the seismic lineaments are mostly NE-SW, NW-SE and N-S within the Piedmont and Coastal Plain Provinces, but they are nearly N-S, and NE-SW within …

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Site Dependent Ground Response For The City Of Patras, Greece, G. A. Athanasopoulos Apr 1995

Site Dependent Ground Response For The City Of Patras, Greece, G. A. Athanasopoulos

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

Results of a preliminary study of seismic ground response at different sites of the coastal city of Patras, in Southern Greece, are presented. At each site equivalent linear 1-D response analyses were conducted by using the finite element program LUSH 2. Values of dynamic properties of soils were obtained from either cross-hole tests or empirical correlations. The 'rigid base' excitation was selected as to best simulate the expected bedrock motions in Patras from local and distant earthquakes. The results of the analyses indicate a strong differentiation of seismic site response when moving from the coastal region of the city to …

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Observed Surface Breakage Due To Strike-Slip Faulting, C. A. Lazarte, J. D. Bray Apr 1995

Observed Surface Breakage Due To Strike-Slip Faulting, C. A. Lazarte, J. D. Bray

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

This paper presents observations from field studies and physical model tests to investigate the response of soil deposits to strike-slip bedrock faulting. The study is relevant to developing mitigation technique against fault-induced damage in structures located near potentially active faults. Observations of ground rupture patterns in alluvial materials following the 1992 Landers earthquake are presented. Particularly important are the observations of significant deformation away from the main trace, the width of the shear zone, and the effects of the surficial geology on the fault expression. Preliminary results from small-scale model tests simulating strike-slip rupture are also presented. The tests results …

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Discussions And Replies — Session Ix, Multiple Authors Apr 1995

Discussions And Replies — Session Ix, Multiple Authors

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

No abstract provided.

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Analysis Of Inclined Shear Waves In Vertical Bluffs, S. A. Ashford, N. Sitar Apr 1995

Analysis Of Inclined Shear Waves In Vertical Bluffs, S. A. Ashford, N. Sitar

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

The effect of inclined shear waves on the seismic response of vertical bluffs is analyzed using the generalized hyperelement. The bluffs are modeled as a stepped halfspace in the frequency domain. It is shown that the response, normalized as a function of slope height (H) divided by wavelength (λ), is amplified for waves travelling into the slope and attenuation for waves travelling away from the slope. This amplification can be as much as twice the amplification for vertically propagating waves. The results of the analysis suggest that wave orientation and inclination in relation to the slope may need to be …

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R-Wave Dispersion Analysis In Transversely Isotropic Stratum, Shiming Wu, Lizhong Wang Apr 1995

R-Wave Dispersion Analysis In Transversely Isotropic Stratum, Shiming Wu, Lizhong Wang

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

With dynamic stiffness of elastic half-space, the Rayleigh wave dispersion in transversely isotropic soil is analyzed by Finite-layer and Semi-infinite layer method. Only is matrix eigenvalue involved, avoiding the calculation procedure encountered in analytical method. Two examples prove the deduction correctly and show that soil anisotropy influences dispersion dramatically. It is possible to study soil anisotropy and characteristics of its dynamical responses from its surface wave dispersion.

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The Effect Of The Produced Vibrations By The Urban Electric Train On The Fillings Of Pumiceous Soils, E. Padilla Apr 1995

The Effect Of The Produced Vibrations By The Urban Electric Train On The Fillings Of Pumiceous Soils, E. Padilla

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

The paper presents the results of a study realized in Guadalajara, capital city of the State of Jalisco, in Mexico, in which it proves that the vibrations produced by the operation of the urban electric train were one of the causes of settlements presented in a habitational zone. These settlements produced very several damages to more of 30 houses. To obtain this conclusion, geotechnical studies, dynamic characterization of subsoil and laboratory tests that included the use of a shake table were realized. With the information analysis, were obtained settlement predictions between 0.035 y 0.135 m.

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Vibrations Caused By Pile Driving, P. J. Moore, J. R. Styles, Wing-Hing Ho Apr 1995

Vibrations Caused By Pile Driving, P. J. Moore, J. R. Styles, Wing-Hing Ho

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

Ground vibrations caused by impact were measured at two sites; one consisting of sand and the other of clay. Measurements were made at various radial distances from the impact location. The impact was produced by a weight falling either on to a plate or on to a rod partly driven into the ground, the latter case simulating pile driving on a small scale. When expressed in terms of scaled energy, the measured peak particle velocities were in reasonable agreement with some of the published data for clay sites but the agreement was poorer for sand sites. Several theoretical expressions were …

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Sliding Base Isolation System For Unreinforced Buildings, M. Tehranizadeh Apr 1995

Sliding Base Isolation System For Unreinforced Buildings, M. Tehranizadeh

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

The Concept of isolating structures from the effects of ground shaking has been discussed for many years. Its practical application was delayed until the successful development has been made. One of the easiest and lowest cost of base isolation system is the sliding or pure friction type that can be used for unreinforced forced masonry bearing wall building. This type of building are very common in different parts of Iran. Preliminary studies have indicated that the represented system for small buildings situated in the seismic region works very well.

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Screening Of Rayleigh Waves By Open Trenches, E. Conte, G. Dente Apr 1995

Screening Of Rayleigh Waves By Open Trenches, E. Conte, G. Dente

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

This paper presents results of a numerical study on the effectiveness of open trenches in reducing the ground vibration caused by propagating Rayleigh waves. The analysis is performed in the frequency domain and under conditions of plane strain using the Boundary Element Method. The soil is modelled as a homogeneous isotropic linear elastic half space. In order to represent the screening effect due to the installation of the barrier, the index ER is introduced. ER is defined as the ratio of the rate of energy transmission over the area to be protected in the presence of the trench and that …

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Evaluation Of Man-Made Ground Vibrations, Xian Jian Yang Apr 1995

Evaluation Of Man-Made Ground Vibrations, Xian Jian Yang

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

The evaluation method of the man-made ground vibration and its formula are reviewed in the paper. The author's formula presented the possibility to solve the Vibration in near source due to the body wave from varied sources. The ground Vibration sources, such as traffic, pile driving etc. and the effects of the embedded source are involved as well. The parameters of the soil energy attenuation and the geometrical attenuation presented have been examined by National Standard Committee of CHINA in 1994. The case histories on varied testing site and vibrating effects are described.

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Discussions And Replies — Session Xii, Multiple Authors Apr 1995

Discussions And Replies — Session Xii, Multiple Authors

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

No abstract provided.

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A New Scenario Earthquake For Southern California Based On The January 17, 1994, Northridge Earthquake, W. W. Hays Apr 1995

A New Scenario Earthquake For Southern California Based On The January 17, 1994, Northridge Earthquake, W. W. Hays

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

Prior to the M 6.8 Northridge, California, earthquake, the two principal scenarios for Southern California were based on a recurrence of a great earthquake (M 8.25) on the San Andreas Fault system and a moderate earthquake (M 6.5) on the Newport-Inglewood fault zone. Like the January 17, 1994, Northridge earthquake, the new scenario event--a blind thrust fault beneath Los Angeles--is expected to generate very high levels of ground shaking (acceleration, velocity, displacement, spectral response) in the epicentral region, trigger ground failure over a wide area; cause extensive damage to the built environment; and test all aspects of the earthquake risk …

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Solid Waste Landfill Performance During The 1994 Northridge Earthquake, A. J. Augello, J. D. Bray, R. B. Seed, N. Matasovic, E. Kavazanjian Jr. Apr 1995

Solid Waste Landfill Performance During The 1994 Northridge Earthquake, A. J. Augello, J. D. Bray, R. B. Seed, N. Matasovic, E. Kavazanjian Jr.

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

The performance of 22landfills in the Los Angeles area during the January 17, 1994 Northridge earthquake has been investigated. Observations of damage at these landfills indicate that the overall performance of solid waste landfills was encouraging. None of the surveyed landfills showed any signs of major damage. However, one geosynthetic-lined landfill experienced two tears in the geomembrane liner. Most landfills within 30 km of the zone of energy release experienced some form of cracking in the soil cover. Beyond approximately 40 km from the zone of energy release, little to no damage was observed.

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The Performance Of Hillside Fills During The Northridge Earthquake, David J. Mcmahon, Alan Kropp, Jonathan P. Stewart, Jonathon D. Bray Apr 1995

The Performance Of Hillside Fills During The Northridge Earthquake, David J. Mcmahon, Alan Kropp, Jonathan P. Stewart, Jonathon D. Bray

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

Many hillside fills located in the Santa Monica, Santa Susana, and San Gabriel Mountains were damaged during the 1994 Northridge Earthquake. While no deaths have been attributed to fill movement, on the order of tens of millions of dollars in property damage was caused by fill movements which typically involved less than about 7.5cm (3 inches) of localized displacement. Some of the damage was induced by permanent deformations of underlying native materials, but most appears to have resulted from ground failure or ground shaking phenomena associated directly with the fill materials. These phenomena include cyclic compaction, lurching, and amplification of …

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Canlex (Canadian Liquefaction Experiment): A One Year Update, P. K. Robertson, B. R. List, B. A. Hofmann Apr 1995

Canlex (Canadian Liquefaction Experiment): A One Year Update, P. K. Robertson, B. R. List, B. A. Hofmann

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

The Canadian Geotechnical engineering community has embarked on a major study regarding the liquefaction of sand entitled The Canadian Liquefaction Experiment (CANLEX) through a collaborative effort of industry, engineering consultants and university participants, with the support of the Natural Sciences and Engineering Research Council of Canada (NSERC). The study is examining the characterization of sand for dynamic and static liquefaction. The project was started in 1993 and is expected to last at least 3 years with equal funding by both industry and NSERC for a total of about C$1.8M. This paper provides a brief progress report on the Project. Three …

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Numerical Modelling Approaches For The Analysis Of Earthquake Triggered Landslides, H. Modaressi, D. Aubry, E. Faccioli, C. Noret Apr 1995

Numerical Modelling Approaches For The Analysis Of Earthquake Triggered Landslides, H. Modaressi, D. Aubry, E. Faccioli, C. Noret

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

Different numerical approaches for the analysis of earthquake triggered landslides are studied. Improved simplified models are developed and their performance for evaluating the response of natural slopes subjected to earthquakes is studied. Using more sophisticated numerical techniques the influence of several factors such as the hydro mechanical behavior assumptions, 1D vs. 2D geometry, and the input motion are assessed. 2D computations have shown that the kinematics of the slope motion is largely affected by the geometry of the slope. As far as the soil behavior is concerned, the results indicate that introduction of progressive yielding in the soil model provides …

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Worldwide Advances In Seismic Zonation, W. W. Hays Apr 1995

Worldwide Advances In Seismic Zonation, W. W. Hays

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

Seismic zonation is the process that integrates the hazard, policy, and built environments to produce maps that divide a geographic region into smaller areas or zones which can be used by community decision makers to answer the question, "Where is the best location to locate and build a specific structure." Seismic zonation maps have been produced by almost every country in the world with the most rapid advances occurring after 1968.

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National Geotechnical Experimentation Sites (Nges), R. D. Woods Apr 1995

National Geotechnical Experimentation Sites (Nges), R. D. Woods

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

The cost of and time required for site characterization in preparation for field experimentation often exceeds the cost and time of performing the experiment. For this reason alone, there is a need for well characterized field experimentation sites. The additional advantage of being able to compare measurements of so1l and rock parameters by new methods with measurements of the same parameters by other methods in well-known materials is very beneficial to the geotechnical community. Finally, the need to perform full scale earth structure experiments dictates a need for well characterized and user friendly sites where large experiments can be performed. …

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Simple Physical Models For Foundation Dynamics, John P. Wolf Apr 1995

Simple Physical Models For Foundation Dynamics, John P. Wolf

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

As an alternative to rigorous boundary-element solutions, simple physical models can be used to determine e.g. the interaction force-displacement relationship (dynamic stiffness) of foundations and the seismic effective foundation input motion. Translational and rotational cones and their corresponding lumped-parameter models together with simple one-dimensional wave patterns in the horizontal plane allow surface, embedded and pile foundations even for a layered site to be analyzed and thus form a major step towards developing a strength-of-materials approach to foundation - vibration analysis. The analysis can mostly be performed directly in the time domain. The physical models provide physical insight which is often …

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