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Articles 5611 - 5640 of 7869

Full-Text Articles in Civil and Environmental Engineering

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

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

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

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

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Current Trends In Design And Analysis Of Paper Machine Foundations, Alex Sy, W. E. Mckevitt Mar 1991

Current Trends In Design And Analysis Of Paper Machine Foundations, Alex Sy, W. E. Mckevitt

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

Current trends in the design and dynamic analysis of paper machine foundations to ensure satisfactory performance are presented in this paper. Space frame foundations for modern high speed paper machines are governed by the requirements to meet stringent alignment/deflection tolerances and dynamic stiffness requirements specified by the machine manufacturer. The current design approach considers the complete machine-foundation-soil interaction. The dynamic response analysis is commonly conducted using a suitable finite element computer code in which the soil is modelled by equivalent springs. Damping is also included in the response calculation. Appropriate stiffness and damping parameters to model the foundation soil or …

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Damage Criteria For Small Amplitude Ground Vibrations, K. Rainer Massarsch, Bengt B. Broms Mar 1991

Damage Criteria For Small Amplitude Ground Vibrations, K. Rainer Massarsch, Bengt B. Broms

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

European codes and recommendations have been reviewed with respect to critical vibration levels, causing damage to buildings. It was found that the variation of the vibration threshold levels was large between the different codes. A rational approach to assess the damage caused by ground vibrations is proposed, based on wave propagation theory. The wave length appears to be the most important parameter. The damage potential was found to be greatest when the length of the propagating wave is equal to or shorter than the length of the building. The wave length can be determined from the frequency and wave propagation …

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Session 11: Discussions And Replies, Multiple Authors Mar 1991

Session 11: 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 Characteristics Of Crusher Supporting Structures, P. Srinivasulu, B. Sivarama Sarma, N. Lakshmanan Mar 1991

Dynamic Characteristics Of Crusher Supporting Structures, P. Srinivasulu, B. Sivarama Sarma, N. Lakshmanan

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

Ring granulator type crushers are installed in many coal handling plants over framed type supporting structures either in steel or reinforced concrete. The causes of excessive vibrations commonly reported from these installations are discussed. The paper describes, in particular, the nature and magnitudes of exciting forces to be considered for the safe design of supporting structures for such machinery. Two practical examples are illustrated - one involving an elevated steel structure and another reinforced concrete framed structure, the latter supporting multiple crushers on the same floor. Pertinent conclusions are drawn for the benefit of future designers of such installations.

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Dynamic Characteristics Of Soils In Calculation Of Vibrations Of Foundations For Machines With Periodical, Pulse And Random Loads, Vadim M. Platesky Mar 1991

Dynamic Characteristics Of Soils In Calculation Of Vibrations Of Foundations For Machines With Periodical, Pulse And Random Loads, Vadim M. Platesky

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

The paper deals with the results of the exper1mental studies performed by the author on the foundations 0.5, 2.4 and 25 sq. m in area under periodical, Pulse and random dynamic loads. Some formulas are given to determine dynamic characteristics of soils. Methods and devices for field dynamic tests of soils are described. The results of the proposed relationship check are given.

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Dynamic Considerations In The Design Of Paper Machine Foundations, J. P. Lee Mar 1991

Dynamic Considerations In The Design Of Paper Machine Foundations, J. P. Lee

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

The design of modern paper machine foundation should consider machine frame supporting foundation and underlying soil as an integrated system. For smooth operation of the machine, quality of paper and economic reasons, a dynamic analysis of the machine system should be performed. This paper discusses three most important factors in the dynamic analysis of a paper machine: (1) Soil-structure interaction effect, (2) frequency analysis, and (3) force-response analysis.

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Ground Vibration Isolated By Silo And Pile Barriers, Xian-Jian Yang Mar 1991

Ground Vibration Isolated By Silo And Pile Barriers, Xian-Jian Yang

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

Based on the model, field test and theory research, this paper puts forward the design method of ground vibration isolated by silo and pita barriers, the practical engineering calculation and the remained problems in this respect. It is pointed out that although the diameter of pile is much smaller than that L/δ shielded wave length (Woods 1978), the ground wave motion can be effectively shielded so long as the proper pile distance is to be selected. This makes it possible that the silo and pile (as well as the pile of other form and material) barriers can be used in …

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Ground Vibration Isolation Using Gas Cushions, K. Rainer Massarsch Mar 1991

Ground Vibration Isolation Using Gas Cushions, K. Rainer Massarsch

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

A new ground vibration isolation method is described, which uses inflated, flexible cushions. The isolation cushions have therefore a low impedance and act as vibration reflectors in the ground. Practical aspects, such as the production of the gas cushions screen, the installation method and the gas-tightness of the gas cushions are discussed. The screen can be installed to great depth, using the well-proven slurry trench technique. After installation, the trench is filled with a self-hardening cement-bentonite grout, which creates a plastic, water-tight protection layer around the cushions and assures the long term stability of the screen. The gas cushion screen …

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Integrated Analysis Of Turbomachinery Frame-Foundation-Soil Interaction, Madhira R. Madhav, N. G. R. Iyengar, S. Kathiroli Mar 1991

Integrated Analysis Of Turbomachinery Frame-Foundation-Soil Interaction, Madhira R. Madhav, N. G. R. Iyengar, S. Kathiroli

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

For the smooth functioning of turbomachines, the design of the rotor, the bearings, the supporting structure, and the foundation should be carried out as an integrated system. The frequency domain method in conjunction with FEM is chosen for the analysis. The modified influence matrix boundary condition method is applied to reduce the number of equations to be solved. Results for 4 idealized cases are compared. It is shown that the interaction effects are significant in the lowest frequency domain.

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Pile Driving Analysis: Two-Phase Finite Element Approach, P. Hölscher Mar 1991

Pile Driving Analysis: Two-Phase Finite Element Approach, P. Hölscher

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

The pile-driving process is analysed using the dynamic finite element program SATURN. The soil is modelled as a two-phase (skeleton and water) axi-symmetric continuum. The elasto-plastic behaviour of the skeleton is considered. Energy dissipation due to radiation, plastic deformation and water-skeleton friction is taken into account. The importance of permeability of the soil, its strength and its dilatancy are outlined. The soil resistance under the toe is strongly influenced by the low compressibility of the water. The results of the simulations show that the non-linear soil behaviour around the pile toe cannot be simulated satisfactorily using a single phase material. …

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Pile Driving Criteria For Construction Near An Historic Dam, L. P. Jedele Mar 1991

Pile Driving Criteria For Construction Near An Historic Dam, L. P. Jedele

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

The construction of a new road included a bridge crossing a river. The location of the bridge crossing was about 300 feet (91.5 meters) downstream from an historic dam. Prior to construction, concerns were raised about vibrations which might be generated from construction activities, especially pile driving for the new bridge abutments, and their potential effect on the integrity of the dam. As a result, a vibration study was conducted on the dam, prior to construction, to assess the vibrations generated from normal operation of the dam and from a simulated pile driving operation. Based on the simulated pile driving …

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

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

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

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

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Prediction Of Vibrations Of Footings For Highly Sensitive Devices, Werner Palloks, Werner Heidrich, Stephan Achilles Mar 1991

Prediction Of Vibrations Of Footings For Highly Sensitive Devices, Werner Palloks, Werner Heidrich, Stephan Achilles

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

When planning foundations for devices sensitive to vibrations the planned location should be investigated for vibrations. These investigations have to include the existing sources in the vicinity as for instance street or rail traffic as well as exciting devices to be installed at the same building site like compressor stations or other machines. The present paper shows a procedure to estimate the vibrations at the planned locations for sensitive devices. The procedure includes investigations of the dynamic soil properties, the decrease of the vibrations with distance, and the transfer functions of rigid footings. It takes into consideration stochastic excitation as …

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Simple Design Methods For Vibration Isolation By Wave Barriers, Tahmeed M. Ai-Hussaini, Shahid Ahmad Mar 1991

Simple Design Methods For Vibration Isolation By Wave Barriers, Tahmeed M. Ai-Hussaini, Shahid Ahmad

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

Rectangular wave barriers (open or infilled trenches) are frequently used in engineering practice to reduce the ground vibrations caused by propagating surface (Rayleigh) waves of relatively small wave lengths. This paper presents models involving simple algebraic formulas for the design of rectangular wave barriers in homogeneous soil deposits. Both vertical and horizontal ground vibrations are considered. An extensive parametric investigation was conducted using a direct boundary element method algorithm. Simple models based on the key dimensionless parameters that control the vibration screening effectiveness were then developed. The utility of such models is established through comparisons with rigorous numerical solutions and …

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Turbogenerator Foundation Analysis Under Wide-Range (Seismic In Particular) Excitation, Igor Andrianov, Vladimir Sedin Mar 1991

Turbogenerator Foundation Analysis Under Wide-Range (Seismic In Particular) Excitation, Igor Andrianov, Vladimir Sedin

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

Dynamics of turbogenerator foundation under wide-range (seismic in particular) excitation is being investigated. It is rather simple to get a solution for low- and high- frequency vibrations in case of a ribbed plate resting on elastic subgrade. As for practical purposes, it is a solution for intermediate parameter values that is of solution. It is shown here that the difficulties could be overcome by two-point fade-approximant method.

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Ground Failure During Loma Prieta Eq - Downtown Santa Cruz, Alan Kropp, Michael Thomas Mar 1991

Ground Failure During Loma Prieta Eq - Downtown Santa Cruz, Alan Kropp, Michael Thomas

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

Ground failure occurred in numerous locations in the downtown Santa Cruz area during the Lorna Prieta Earthquake. These failures included liquefaction, lateral spreading and lurch cracking. Mapping of many of these features was made within three days of the earthquake, before heavy rains obscured much of the surface evidence. Data from a United States Geological Survey study of liquefaction potential in Santa Cruz has been examined. In addition, subsurface information has been collected from several downtown subsurface exploration studies. A comparison has been made between areas where ground failure was predicted and where it occurred during the Lorna Prieta Earthquake. …

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Lifeline And Geotechnical Aspects Of The 1989 Loma Prieta Earthquake, T. D. O'Rourke, H. E. Stewart, T. E. Gowdy, J. W. Pease Mar 1991

Lifeline And Geotechnical Aspects Of The 1989 Loma Prieta Earthquake, T. D. O'Rourke, H. E. Stewart, T. E. Gowdy, J. W. Pease

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

This paper provides an overview of areas in San Francisco which were affected by soil liquefaction and significant ground deformation as a result of the Loma Prieta earthquake. The distribution of pipeline system damage is examined, and comparisons are made between 1989 and 1906 patterns of water supply damage. Special attention is given to the Marina to illustrate how the natural site conditions and artificial fills contributed to soil liquefaction and buried pipeline damage of both the water and gas distribution networks. Finally, the liquefaction potentials of natural beach and sand bar deposits, land-tipped fill, and hydraulic fill are evaluated …

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Liquefaction Of Soils In The 1989 Loma Prieta Earthquake, Raymond B. Seed, Michael F. Riemer, Stephen E. Dickenson Mar 1991

Liquefaction Of Soils In The 1989 Loma Prieta Earthquake, Raymond B. Seed, Michael F. Riemer, Stephen E. Dickenson

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

The Loma Prieta Earthquake of October 17, 1989 was the most costly single natural disaster in U.S. history, resulting in losses of $7 to $9 billion, and claiming 63 lives. These damages were concentrated mainly at a number of distinct sites comprising a relatively small fraction of the affected region, as local site conditions and related geotechnical factors exerted a major influence on damage patterns and loss of life in this catastrophic event. This paper discusses one of these geotechnical factors, the widespread occurrence of soil liquefaction during the earthquake, as well as the associated damages and the resulting lessons …

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Prediction Of Loma Prieta Earthquake And Creation Of Awareness About It In Society, Arun Bapat Mar 1991

Prediction Of Loma Prieta Earthquake And Creation Of Awareness About It In Society, Arun Bapat

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

Prediction of earthquake as an exercise of academic interest is one activity. Creation of awareness about seismic disaster and its mitigation is more broad base social activity. It is necessary that the predicted seismic event is likely to occur, people in the vulnerable seismic area should be told about the utility of macroseismic, short-term reliable earthquake precursors, which could be observed by common man. The happenings involving both the above cases for Loma Prieta earthquake are discussed.

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Site Stratigraphy And Its Effects On Soil Amplification In The Greater Oakland Area During The October 17, 1989 Loma Prieta Earthquake, J. David Rogers Mar 1991

Site Stratigraphy And Its Effects On Soil Amplification In The Greater Oakland Area During The October 17, 1989 Loma Prieta Earthquake, J. David Rogers

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

No abstract provided.

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The Loma Prieta Earthquake: Implications Of Structural Damage, S. A. Mahin Mar 1991

The Loma Prieta Earthquake: Implications Of Structural Damage, S. A. Mahin

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

The Loma Prieta earthquake provides a wealth of information on the seismic response of a wide variety of structures over a large metropolitan area. Soil amplification at sites distant from the epicenter contributed significantly to the substantial damages developed during the earthquake. Because of the large shaken area, the earthquake provides much useful information for all those interested in earthquake engineering. Structural damages resulting from the earthquake are reviewed herein with emphasis on buildings and bridges. Implications for modern design and retrofit methods are highlighted. Emphasis is placed on the need to carefully consider soil conditions, to treat the structure …

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A Study On Pile Forces Of A Pile Group In Layered Soil Under Seismic Loadings, Hasegawa Masayuki, Nakal Shoichi Mar 1991

A Study On Pile Forces Of A Pile Group In Layered Soil Under Seismic Loadings, Hasegawa Masayuki, Nakal Shoichi

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

Characteristics of pile forces under seismic loadings are discussed from view points of the inertial interaction due to the mass effect of a superstructure and the kinematic interaction due to the resistance effect of piles against soil motions. A typical building supported on a pile group embedded in a layered soil, which has two- and four layer profiles, is chosen for studying the pile forces which imply the shearing force and bending moment. The earthquake response analysis is performed in accordance with the substructure method, in which the group effect of piles in the layered soil is appropriately included by …

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Characteristics Of Vertical Ground Motions Recorded During The Lorna Prieta Earthquake, Marshall Lew Mar 1991

Characteristics Of Vertical Ground Motions Recorded During The Lorna Prieta Earthquake, Marshall Lew

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

A study of a limited number of vertical ground motion acceleration-time histories recorded during the Loma Prieta earthquake of October 17, 1989 has been made. It has been found that maximum vertical ground motions may be greater than the horizontal ground motions in the near vicinity of the fault rupture zone. The limited records suggest that there is more spectral energy at very short structural periods in the vertical ground motions as compared with the horizontal ground motions. At longer periods, the vertical energy is significantly less, however, there is an increasing trend for very long structural periods.

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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 Mar 1991

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 …

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Contributed Papers: Discussions And Replies, T. Kagawa Mar 1991

Contributed Papers: Discussions And Replies, T. Kagawa

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

No abstract provided.

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Ground Motion Characteristics Of The San Francisco Bay Area Detected By Microtremor Measurements, T. Ohmachi, Y. Nakamura, T. Toshinawa Mar 1991

Ground Motion Characteristics Of The San Francisco Bay Area Detected By Microtremor Measurements, T. Ohmachi, Y. Nakamura, T. Toshinawa

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

Microtremor measurement was done mainly in the damaged areas in San Francisco and Oakland after the 1989 Loma Prieta earthquake. The observation areas were (1) the Marina District, (2) Cypress Street, (3) the Embarcadero, and (4) South of Market District. Predominant frequency (Fp) and amplification factor (Ap) obtained from a spectral ratio between horizontal and vertical components were evaluated for each observation cite. Difference in the degree of damage in the areas (1) and (4) was coincident with difference in Ap and Fp. Significant difference could not be found in Ap and Fp between the areas (2) and (3).

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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 Mar 1991

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. …

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Liquefaction And Surface Settlement In The Marina District, D. Rosidi, W. B. Wigginton Mar 1991

Liquefaction And Surface Settlement In The Marina District, D. Rosidi, W. B. Wigginton

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

This paper evaluates the liquefaction potential of sands within the Marina District. Three types of underlying potentially liquefiable soil deposits are studied: (A) Hydraulic fill, (B) Artificial fill, and (C) Strawberry Island and other modern beach deposits. A liquefaction analysis for each of these deposits is conducted. It is suggested that a Peak Ground Acceleration (PGA) of approximately 0.1g is needed in the Marina District to initiate liquefaction. Relations between PGA and thickness of liquefiable soil, as well as potential surface settlement are presented. These relationships are useful for the study of expected performance of the Marina District in future …

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

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

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

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

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