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Articles 5581 - 5610 of 7869

Full-Text Articles in Civil and Environmental Engineering

Dynamical Behavior Of A Slightly Alluvial Basin Due To Concentrated Turbulence, Takashi Nishigaki, Kensuke Baba Mar 1991

Dynamical Behavior Of A Slightly Alluvial Basin Due To Concentrated Turbulence, Takashi Nishigaki, Kensuke Baba

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

This paper is concerned with theoretical analyses and numerical evaluations based on the wave propagation theory to find dynamic characteristics of an alluvial basin locally situated on a half spatial bedrock due to concentrated loadings on the free surface. The method presented herein is derived from the Aki and Larner's method by releasing the assumption of the repeated irregularities, so that the wave field having localized irregularities can be evaluated. The numerical analyses show that the amplification effects are obvious on the free surface inside the alluvial sediment and the subsurface structure influences the seismic behavior observed on the surface.

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Effect Of Local Soil Stratigraphy On Microtremor Measurements, George Bouckovalas, Ioanna Krikeli Mar 1991

Effect Of Local Soil Stratigraphy On Microtremor Measurements, George Bouckovalas, Ioanna Krikeli

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

The method of microtremors has been recently applied for the microzonation of the town of alamata, in southern Greece. Results from this study are evaluated in comparison with predictions of seismic ground response obtained by 1-D wave propagation analyses. Predominant periods of microtremor are considerably lower than estimated fundamental ground periods. It is shown that a small part of the observed differences in due to soil non-linearity in connection with the small strain amplitudes induced by microtremors. The largest part appears to be due to geologic factors, namely the existence of rigid soil layers within the soft soil above the …

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Effects Of Local Soil Conditions In The 1986 Kalamata Earthquakes, George A. Athanasopoulos Mar 1991

Effects Of Local Soil Conditions In The 1986 Kalamata Earthquakes, George A. Athanasopoulos

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

Seismic ground response analyses and simplified determinations of fundamental periods of soil profiles were conducted for nine sites of the Greek coastal city of Kalamata which was struck by two destructive small epicentral distance earthquakes in September of 1986. The response analyses were performed by using the computer program LUSH here as the fundamental periods were determined by applying simplified methods suggested in recent literature. The dynamic soil properties needed in all calculations were obtained by in-situ and laboratory testing. The results of all analyses showed differentiation of response from site to site in terms of both frequency content and …

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Evaluation Of Soil Amplification At Smart1 Array, Taiwan, Mansour Niazi Mar 1991

Evaluation Of Soil Amplification At Smart1 Array, Taiwan, Mansour Niazi

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

In a recent compilation and analysis of nearly 750 accelerograms, we studied six pairs of triaxial accelerograms recorded digitally at two neighboring sites underlain by rock and soil, respectively. The distance between the two sites, both located south of the SMART1 array in northeast Taiwan, is approximately 2 km. The epicentral distances are less than 80 km. For each component, we computed the ratios of peak and spectral amplitudes recorded at the soil site to that of the rock site, for three peak parameters and 23 spectral ordinates. The mean estimates of the soil amplification for the peak parameters range …

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Session 8: Opening Remarks, Ricardo Dobry Mar 1991

Session 8: Opening Remarks, Ricardo Dobry

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

No abstract provided.

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Pseudo- Three-Dimensional Analysis Of Cyclic Deformation Of Ground Subject To Seismic Liquefaction, Ikuo Towhata, M. D. Shafiqui Islam Mar 1991

Pseudo- Three-Dimensional Analysis Of Cyclic Deformation Of Ground Subject To Seismic Liquefaction, Ikuo Towhata, M. D. Shafiqui Islam

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

A Numerical tool was developed to evaluate the effects of differential movement which occurs at the ground surface during earthquakes. A special emphasis is placed on liquefaction of subsoils. A complicated three-dimensional analysis was avoided by using a pseudo-three-dimensional method of finite element analysis which runs on an element mesh of the ground surface topography as seen from the sky. The present analysis takes into account the nonlinear stress-strain behavior of soils, the ground softening due to pore pressure development, and the irregularity in the topography. The proposed method was applied to several cases in which buried pipelines were damaged …

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Seismic Response Of Deep Soil Profiles In The New Madrid Seismic Zone, William E. Manrod Iii, James E. Beavers, M. Joe Hunt Mar 1991

Seismic Response Of Deep Soil Profiles In The New Madrid Seismic Zone, William E. Manrod Iii, James E. Beavers, M. Joe Hunt

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

Geotechnical and geophysical investigations are being performed at a site which is located within 60 km of the epicenter of the 8.7 magnitude New Madrid February 7, 1812 earthquake. The exploration is being performed to determine the seismic response of the soil profile and to evaluate the liquefaction potential of the site. Permanent downhole instrumentation for seismic monitoring will be installed.

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General Report Session 9: Seismology: Predicting Strong Ground Motion For Design, Pierre-Yves Bard Mar 1991

General Report Session 9: Seismology: Predicting Strong Ground Motion For Design, Pierre-Yves Bard

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

The 14 papers of the session may be divided (somewhat artificially, of course) in three main subgroups: - a significant number (5) deal with the whole process of predicting strong ground motion for design, starting from geological / tectonic considerations and ending at a quantitative estimate of some ground motion parameters (peak acceleration, response spectrum,. .. ), either on a regional or national scale for zoning purposes (9.17, 9.24), or at a specific site for the design of some specific structures (papers 9.10, 9.13), or finally from a methodological point of view ( 9.13, 9.24, 9.26). - the 7 papers …

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Session 8: Co-Chairman's Report, John G. Anderson Mar 1991

Session 8: Co-Chairman's Report, John G. Anderson

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

No abstract provided.

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Site Amplification Effects In The Ubaye Valley (France): Measurements And Modeling, Denis Jongmans, Michel Campillo Mar 1991

Site Amplification Effects In The Ubaye Valley (France): Measurements And Modeling, Denis Jongmans, Michel Campillo

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

Local soil conditions can yield to significant variations in ground motion generated by earthquakes. During the last two decades, these amplification effects have been observed by numerous authors for well-documented earthquakes. On the other hand, theoretical models and numerical techniques have been proposed to physically understand site effects. However, few comparisons have been made between observations and theoretical results for well-known 2D structures (sediment-filled valleys). The aim of this paper is to present a study of the response of a valley in the French Alps. The structure (Ubaye valley) was chosen for its moderate dimensions (500 meters wide and 65 …

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Soil Amplification Based On Array Observation In Chiba, Japan, Lin Lu, Tsuneo Katayama, Fumio Yamazaki Mar 1991

Soil Amplification Based On Array Observation In Chiba, Japan, Lin Lu, Tsuneo Katayama, Fumio Yamazaki

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

The amplification characteristics of earthquake ground motion were investigated based on the Chiba Array observation records. The amplification of peak acceleration occurred mostly at the top soft layer and is similar for the three ground motion components. The ensemble Fourier spectrum ratio and coherence function were calculated and the amplification can be clearly seen in them. The drop of the coherence function at natural frequencies was discussed. The Fourier spectrum ratio and coherence function were also obtained using the smoothing procedure and were compared with those of the ensemble. Microtremor was measured at 11 points corresponding to the location of …

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General Report Session 8: Soil Amplification During Earthquakes And Microzonation, J. Carl Stepp Mar 1991

General Report Session 8: Soil Amplification During Earthquakes And Microzonation, J. Carl Stepp

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

No abstract provided.

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Study Of Site Response At Memphis Due To A Large New Madrid Earthquake, Shahid Ahmad, Hemand Desai, Elsa Stara-Gazetas Mar 1991

Study Of Site Response At Memphis Due To A Large New Madrid Earthquake, Shahid Ahmad, Hemand Desai, Elsa Stara-Gazetas

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

The influence of geological and geotechnical factors on potential ground motions in Memphis due to a 65km distant hypothetical M=7 New Madrid earthquake has been investigated. From the study of the seismotectonic environment and the seismicity of the region, the characteristics of the "design earthquake" are selected. A seismological model of the radiation/attenuation of the earthquake source and of the generated waves is used to generate synthetic bedrock ("hard rock") accelerograms, which are then propagated through a deep deposit of "soft-rock" to obtain input base excitations for the near-surface soil profiles. A representative soil profile for Memphis is selected from …

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A Novel Method For Synthesizing Acceleration Time History With Consideration Of Earthquake Environment, He Yang Mar 1991

A Novel Method For Synthesizing Acceleration Time History With Consideration Of Earthquake Environment, He Yang

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

A new method for generating earthquake time histories compatible with the rock response spectrum as the result of seismic hazard analysis will be presented in this paper. It is suggested that the base bank, which is composed of recorded ground motions with different response spectrum characteristics, should be used to select the initial solution. And then, modifying it iteratively to match the target spectrum. In this way, the earthquake environment could be considered.

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Application Of Fuzzy Set Theory In Option Of Response Spectra, Zhou Xiyuan, Su Jingyu Mar 1991

Application Of Fuzzy Set Theory In Option Of Response Spectra, Zhou Xiyuan, Su Jingyu

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

In order to consider the fuzziness of seismic intensity indecated by zoning map and seismic code in seismic design of structure, an innovative method in option of design spectrum in consideration of fuzziness of regional seismic hazard and site condition is presented herein. The solution of the problem can be divided into two steps: 1. to define and establish a fuzzy set for predicting and judging regional seismic hazard and site condition by applying fuzzy mathematics; 2. further to find out fuzzy vector of design spectrum depending on the fuzzy set of regional seismic hazard and site condition by applying …

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Session 9: Discussions And Replies, Multiple Authors Mar 1991

Session 9: Discussions And Replies, Multiple Authors

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

No abstract provided.

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Earthquake Damage Done At Right Angles To Epicentral Direction, Makoto Nasu Mar 1991

Earthquake Damage Done At Right Angles To Epicentral Direction, Makoto Nasu

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

In order to make clear the structures of grounds which are liable to induce earthquake damage, the relations between seismic deformation of various objects and the structures of the grounds under them, and the intersectional angles between the epicentral direction and their longitudinal axes and between the epicentral direction and the deformational directions have been investigated on the basis of many examples of such damage. Various objects such as embankments on heterogeneous grounds, for example, grounds including inclined soft soil layer or made of soft soil layer with inclined bottom, or various objects straddling soft and hard grounds, are Liable …

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Fault Induced Ground Deformations And Their Effect On Structures, Luis E. Vallejo, Mahiru Shettima Mar 1991

Fault Induced Ground Deformations And Their Effect On Structures, Luis E. Vallejo, Mahiru Shettima

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

In the United States and in many other regions of the world, structures such as earth dams are built in areas very close to strike-slip faults. For the safe design of these and other types of structures, geotechnical engineers need a reliable estimate of the ground deformations that fault movement will induce at the site of the proposed structures. In this study, the vertical ground deformations induced by the movement of one strike-slip fault segment is estimated with the use of Linear Elastic Fracture Mechanics (LEFM) theory. The ground deformations estimated using this theory and the deformations experienced by the …

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Geological And Seismicity Evaluation Of Srinagarind Dam, S. Klaipongpan, V. Chakramanont, J. Pinrode, P. Chittrakarn Mar 1991

Geological And Seismicity Evaluation Of Srinagarind Dam, S. Klaipongpan, V. Chakramanont, J. Pinrode, P. Chittrakarn

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

In April of 198 3, a sequence of earthquakes were recorded by the National Seismic Network where the epicenters were located in the upper reaches of the Srinagarind Reservoir. A detailed evaluation of these earthquakes has been initiated since that time. Network of micro seismic instruments have also been installed in the region in order to establish the capability of higher resolution for seismic parameters and allow the greater understanding of the mechanism of the activity. After seven years of monitoring and data collecting, analyses of the results have been performed. Results obtained from the evaluation of overall characteristic seismicity, …

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Guerrero Accelerograph Array: Status And Selected Results, J. G. Anderson, A. Mendez, R. Quaas, J. N. Humphrey, R. Castro, S. K. Singh Mar 1991

Guerrero Accelerograph Array: Status And Selected Results, J. G. Anderson, A. Mendez, R. Quaas, J. N. Humphrey, R. Castro, S. K. Singh

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

This paper summarizes the history and rational for installation of the Guerrero accelerograph array. The array is producing unprecedented quantities of high quality digital strong motion data. Recent research using the array data has included studies on attenuation, site effects, scaling of spectra with magnitude, the ratio of vertical to horizontal accelerations, and the source of the September 19, 1985 earthquake.

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Prediction Of Characteristics Of Surface Wave For Earthquake Resistant Design, S. Nakamura, I. Suetomi Mar 1991

Prediction Of Characteristics Of Surface Wave For Earthquake Resistant Design, S. Nakamura, I. Suetomi

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

Surface waves are not considered directly in the current earthquake resistant design code of the underground lineal structure, because a method for estimating the surface wave as input motion is not established. A procedure for calculating the expected value of peak ground displacement from bedrock motion is presented in this paper; the bedrock motion is converted to Love Nave spectra by the method proposed by the authors, and Love wave spectra is converted to peak ground displacement by the method proposed newly in this paper. Input motions of the underground transmission line is estimated as an example case to compare …

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Seismic Risk Analysis For A Site Along The Gorda Segment Of The Cascadia Subduction Zone, Ronald C. Chaney, Guy Conversano, Gary Carver, David N. Lindberg, Frank Bickner Mar 1991

Seismic Risk Analysis For A Site Along The Gorda Segment Of The Cascadia Subduction Zone, Ronald C. Chaney, Guy Conversano, Gary Carver, David N. Lindberg, Frank Bickner

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

A seismic risk evaluation was conducted on a site near Eureka, California. The site was subject to potential earthquake loading from a number of sources. These sources were: (1) Mendocino Fracture Zone, (2) Gorda Segment of the Cascadia Subduction Zone, (3) Little Salmon thrust fault under the site, (4) Mad River Fault Zone, and (5) Intra plate west - Gorda Plate. The geology of thrust faults in Northern California is examined along with that of the Mendocino Fracture Zone, and the southern section (Gorda Segment) of the Cascadia subduction zone. A trench log showing a splay of the Little Salmon …

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Subsurface Conditions In Memphis And Shelby County, Tennessee, T. S. Chang, K. W. Ng, H. Hwang, C. S. Lee Mar 1991

Subsurface Conditions In Memphis And Shelby County, Tennessee, T. S. Chang, K. W. Ng, H. Hwang, C. S. Lee

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

Investigation of subsurface conditions in the Memphis and Shelby County area, located within 100 miles south of the New Madrid seismic zone, was conducted by studying the soil data of more than 8,500 boring logs in the study area. These soil boring logs were collected from government agencies and private geotechnical companies so that the overall subsurface investigation was feasible and affordable. The subsurface conditions were presented in the standardized format of representative soil logs in accordance with a grid system applied to the study area. The results of the subsurface investigation are essential for regional seismic study such as …

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Array Processing Of Rayleigh Waves For Shear Structure, T. G. Barker, J. L. Stevens Mar 1991

Array Processing Of Rayleigh Waves For Shear Structure, T. G. Barker, J. L. Stevens

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

Site response to earthquakes is strongly dependent on shallow shear wave velocity structure β(z), and evidence suggests that soil strength and liquefaction potential depends on it as well. We have determined β(z) at several sites by inversion of dispersion data from Rayleigh waves recorded on linear arrays of geophones using artificial sources. Improved methods have been developed for extracting phase and group velocities that lead to significantly more stable and accurate inversion results.

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Session 10: Discussions And Replies, Multiple Authors Mar 1991

Session 10: Discussions And Replies, Multiple Authors

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

No abstract provided.

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Dispersion Characteristics Of Elastic Waves In Saturated Soils, Shiming Wu, Longzhu Chen Mar 1991

Dispersion Characteristics Of Elastic Waves In Saturated Soils, Shiming Wu, Longzhu Chen

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

Based on the wave equations established by the authors, the dispersion characteristics of elastic waves in saturated soils are analyzed and verified by laboratory test and seismic survey in the field. The results can be used for determination of physical and mechanical parameters of saturated soils, such as, Poisson's ratio, depth for first appearance of full saturation, porosity and unit weight by measurement of wave velocities.

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Generalized Rayleigh Waves In Layered Solid-Fluid Media, Hua Hui Tan Mar 1991

Generalized Rayleigh Waves In Layered Solid-Fluid Media, Hua Hui Tan

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

A finite-element method for the propagation of Rayleigh-type waves in layered solid-fluid media is presented. The method uses displacement as the only parameter to describe the solid and the fluid motions. A penalty function method and a selective integration technique are employed to change the elastic coefficient matrix of fluid from singular to nonsingular. Results obtained from the proposed method agree well with those obtained from available analytical solutions. The method can be used to study the propagation of Rayleigh-type waves in a two-dimensional, irregular solid-fluid system.

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Investigation Of Stress Waves Reflection Problems From A Free Surface By Dynamical Photoelasticity Method, I. Ch. Kostin Mar 1991

Investigation Of Stress Waves Reflection Problems From A Free Surface By Dynamical Photoelasticity Method, I. Ch. Kostin

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

No abstract provided.

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Leak Detection In Large Storage Tanks Using Seismic Boundary Waves, M. Kashi, K. Maser, A. Sotoodehnia Mar 1991

Leak Detection In Large Storage Tanks Using Seismic Boundary Waves, M. Kashi, K. Maser, A. Sotoodehnia

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

This paper describes a field evaluation of a technique for detecting leaks in large above ground storage tanks. The technique detects leaking tank products in the foundation material by sensing anomalies in seismic boundary waves transmitted across the tank bottom. The evaluation consisted of three steps: (1) investigation of surface (Rayleigh) wave anomalies due to surface soil saturation in linear arrays; (2) evaluation of boundary waves propagated across the bottom of typical tanks; and (3) a surface (Rayleigh) wave experiment using tomography to locate velocity changes due to surface soil saturation. The results of these tests have shown that boundary …

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Three Dimensional Wave Propagation Due To Pile Driving, S. Savidis, A. Mitakidis Mar 1991

Three Dimensional Wave Propagation Due To Pile Driving, S. Savidis, A. Mitakidis

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

A very economical and efficient method to construct pile foundations or sheet walls is given by the driving of the pile itself in the case of prefabricated piles or of the steel-sheet pipe for concrete piles in situ and also by the driving of the sheet piles in the case of sheet walls. In spite of its efficiency this method underlies, because of environment protection reasons to certain restrictions that concern the influence of the produced shock waves during the driving procedure to neighboring buildings and constructions. For the theoretical calculation of this influence at first the free-field response of …

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