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Articles 10591 - 10620 of 13031

Full-Text Articles in Engineering

A Study Of Lateral Bearing Capacity Of Pile By Dynamic Test, Guang-Yun Gao, Xian-Jian Yang, Yi-Dai Liu Apr 1995

A Study Of Lateral Bearing Capacity Of Pile By Dynamic Test, Guang-Yun Gao, Xian-Jian Yang, Yi-Dai Liu

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

In order to improve the knowledge of the Lateral Loading behavior of artificially drilled cast-in-place concrete piles, the full-scale lateral static and dynamic loading tests of eleven piles had been carried out by the authors in Louyang, China. In this paper, the principle of laterally dynamic pile test is discussed. The results of the static and dynamic tests performed in the light of different diameter piles are analyzed comparatively. It is found that the critical loads defined by the dynamic testing are almost identical with results of the static testing ones. Thus we come to a conclusion that the lateral …

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Large Amplitude Settlements Of Oil Storage Tanks, Medhat A. Haroun, Yunxia Wang, Wajdi Abou-Lzzeddine, Nicolino Mode Apr 1995

Large Amplitude Settlements Of Oil Storage Tanks, Medhat A. Haroun, Yunxia Wang, Wajdi Abou-Lzzeddine, Nicolino Mode

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

The measured profile of large-amplitude settlements of an oil storage tank was analyzed by the finite element method. Both geometric and material nonlinearities were included in the finite element analysis. Stresses and deformations, based on available qualification criteria, were examined. The results showed that most criteria in use today for the tank shell and the bottom plate are overly conservative. The calculated response of the existing operational tank under the measured large-amplitude settlements confirmed such an observation.

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Effect Of Soil Properties On Foundation Settlements Under Earthquake Loading, M. Tehranizadeh Apr 1995

Effect Of Soil Properties On Foundation Settlements Under Earthquake Loading, M. Tehranizadeh

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

An analytical study is carried out to predict the immediate settlement of the structures during earthquake loadings. In this analysis a three dimensions mathematical model is used to investigate the behavior of the whole system consisting of soil -foundation and structure. The deformation of different points of the foundation as well as the other parts of the structure are calculated. The time acceleration record of Tabas earthquake was used as an earthquake type of loading. The effect of the main factors on the elastic settlement of the structure such as soil elastic modulus, foundation thickness, weight of the structure and …

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Discussions And Replies — Session V, Multiple Authors Apr 1995

Discussions And Replies — Session V, Multiple Authors

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

No abstract provided.

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Seismic Response Of Embankment Dams, L. Caldeira, P. Seco E Pinto, J. Bilé Serra Apr 1995

Seismic Response Of Embankment Dams, L. Caldeira, P. Seco E Pinto, J. Bilé Serra

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

This study is intended as a contribution towards a better understanding of the seismic response of embankment dams. Laboratory tests for the determination of static and dynamic mechanical properties of the material are described. A parametric study is performed varying the main source of earthquakes, the height of the dam, the type of the materials and the core position (central and upstream sloping core). The dynamic analyses have made possible the identification of hazard scenarios and particularly the evaluation of stability and residual deformation of the dams.

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Mine Tailings Deposition Practices, Liquefaction Potential And Stability Implications, D. S. Hallman, R. Dorey Apr 1995

Mine Tailings Deposition Practices, Liquefaction Potential And Stability Implications, D. S. Hallman, R. Dorey

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

Typical mine tailings characteristics resulting from different deposition practices are discussed. The potential for liquefaction of the tailings during seismic events is presented. A discussion of how the tailings deposition method can affect the liquefaction potential is included. Tailings dam construction techniques are reviewed and evaluated with respect to the tailings deposition method and liquefaction potential. A case history is presented to illustrate how the tailings dam construction method must be coordinated with the method of tailings deposition.

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Seismic Design Of Landfills For Ne United States, C. Soydemir Apr 1995

Seismic Design Of Landfills For Ne United States, C. Soydemir

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

Northeastern U.S. seismicity is briefly discussed and design earthquake is established for landfill projects in accordance with current federal regulations. Methods previously developed for embankment dams are reviewed relative to the seismic stability evaluation of solid waste landfills. Charts were developed to expedite bottom liner and cover system selection while meeting particular seismic design requirements.

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Model Parametric Studies Of The Earthquake Response Of The Embankment Dam, Hubert K. Law, Hon-Yim Ko Apr 1995

Model Parametric Studies Of The Earthquake Response Of The Embankment Dam, Hubert K. Law, Hon-Yim Ko

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

Several centrifuge model dams were tested with the conditions similar to those of O'Neill Forebay Dam, California to examine the structural behavior under seismic excitation. A few experiments were carried out to study the performance of the dam, whose geometry was still the same as O'Neill Dam, but the soil properties were altered by adding some gravel or increasing the compaction density. The results of either test clearly demonstrated a stiffer response to seismic excitation than the model with the original prototype material properties. Characteristics of O'Neil! Forebay Dam with different structural modifications were examined. These included construction of a …

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Backanalysis Of Deformations For Case Histories Involving Flow-Type Failures, John P. Sully, Américo Fernández, Sara Zalzman Apr 1995

Backanalysis Of Deformations For Case Histories Involving Flow-Type Failures, John P. Sully, Américo Fernández, Sara Zalzman

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

The results obtained from back analyses of two case histories of failures of small earth dams resulting from liquefaction of foundation soils are presented. The analyses have been performed in order to evaluate the deformation parameters used in a finite difference model (developed by Woodward-Clyde Associates), specifically those relevant to the liquefied soil layer. For both case histories, the final deformed shape of the earth dam is known and serves as a basis for comparing the results from the numerical study, in terms of the deformation moduli employed.

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Predicted And Observed Liquefaction Induced Deformations Of La Palma Dam, Hendra Jitno, Peter M. Byrne Apr 1995

Predicted And Observed Liquefaction Induced Deformations Of La Palma Dam, Hendra Jitno, Peter M. Byrne

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

The paper presents a prediction of liquefaction induced deformation of La Palma dam due to the 1985 Chilean earthquake using a simplified pseudo-dynamic procedure. The procedure is essentially an extension of Newmark's method from a rigid-plastic single degree of freedom to a flexible multi degree of freedom system. It takes into account both the effects of the inertia forces from the earthquake and the softening of the liquefied soil. The results show that the predicted displacements are in general agreement with field observations both in terms of magnitude and pattern of deformations.

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Effect Of Canyon Shape On Longitudi-Vibration Of Earth Dam, Zhi-Ying Xu Apr 1995

Effect Of Canyon Shape On Longitudi-Vibration Of Earth Dam, Zhi-Ying Xu

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

In this paper, the effects of narrow and sloping canyons on the longitudinal dynamic response of earth dams is investigated by a simplified method for 3-D dynamic analysis. Analytical results for earth dams with several width to height ratios are compared with the results of plane strain solutions for comparable sections. For an embankment in a triangular valley with a width to height ratio of 1~2 and subjected to earthquake motions, the computed max. accelerations at the midsection were about 30 to 50% higher in a simplified 3-D response analysis than in a plane strain analysis. On the other hand …

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Transient Seismic Response Of Irregular Sites, Hirokazu Takemiya, Maher Adam, Shingo Yasui Apr 1995

Transient Seismic Response Of Irregular Sites, Hirokazu Takemiya, Maher Adam, Shingo Yasui

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

Presented is the transient seismic response of alluviums with due account for the configuration and the size in view of incident wave type and the length, besides the stiffness contrast to the underlain far extending base. The BEM-FEM hybrid computation is taken in order to give a clear interpretation to the seismic wave scattering and propagation. Parametric studies are performed aiming at acquiring the relevant soil amplification which is useful information for the structural design on irregular site.

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Seismic Microzonation Of The City Of Puebla, Mexico, F. J. Chavez-Garcia, J. Cuenca, J. Lermo, H. Mijares Apr 1995

Seismic Microzonation Of The City Of Puebla, Mexico, F. J. Chavez-Garcia, J. Cuenca, J. Lermo, H. Mijares

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

We gathered information concerning the seismic response of the city of Puebla including: surface geology and hydrology, bore-hole data, damage information for two destructive earthquakes, and earthquake records in four strong motion instruments that have operated in the city. Additional data was obtained from three experiments: microtremor measurements in 39 points within the urban zone; installation and operation of a temporal digital seismograph network; a small scale refraction experiment. Consideration of all data together allows to draw a coherent picture of site effects in the urban zone. Based on these results, we propose a preliminary seismic microzonation map for the …

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Effect Of Built Environment On "Free-Field" Motion For Very Soft, Urbanized Sites, Pierre-Yves Bard, Armand Wirgin Apr 1995

Effect Of Built Environment On "Free-Field" Motion For Very Soft, Urbanized Sites, Pierre-Yves Bard, Armand Wirgin

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

A preliminary numerical investigation is presented on the long distance effects of soil-structure interaction for important buildings located on soft soils. A simple 20 model is considered, with homogeneous rectangular buildings resting on a single, horizontal, soft layer overlying a much stiffer half-space, impinged by SH waves. Computations are made for different parameter sets, in order to analyze the respective effects of the main parameters: clay layer thickness and frequency, building size, and spacing between buildings. For realistic building properties, wave diffraction related with soil- structure interaction is shown to alter the "free-field" surface motion up to distances of at …

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Site Specific Seismic/Geologic Hazards Risk Zoning, F. R. Bickner, D. N. Lindberg, R. C. Chaney Apr 1995

Site Specific Seismic/Geologic Hazards Risk Zoning, F. R. Bickner, D. N. Lindberg, R. C. Chaney

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

A site specific risk zoning study was conducted on a Junior College Campus near Eureka, California, USA to evaluate the potential seismic/geologic hazards due to the presence of a 1 km wide low angle thrust fault system. Issues addressed to determine the level of risk at any location on the campus include: land sliding, earthquake ground shaking, ground surface rupture and deformation, lateral spreading, liquefaction, differential settlement, and tsunamis. Based on these potential hazards, a micro-zonation model was developed based on 13 different zones and 5 levels of risk. Information for use in this model was collected using a combination …

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Seismicity Of Jordan And Conterminous Countries, Abdallah I. Husein (Malkawi), Robert Y. Liang, Osama Kh. Nusier Apr 1995

Seismicity Of Jordan And Conterminous Countries, Abdallah I. Husein (Malkawi), Robert Y. Liang, Osama Kh. Nusier

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

An up-to-date seismic hazard maps for Jordan and conterminous areas have been developed based on probabilistic approach. Such maps are intended to show the Peak Ground Acceleration (PGA) with 90% probability of not being exceeded in a life time of 50, 100, and 200 years, respectively. The computer program FRISK was used for estimating the PGA. A suitable attenuation equation reported in the literature, along with up-to-date earthquake catalogue including all the earthquake events that occurred in Jordan and neighboring countries, were considered in this study. Altogether, ten seismic zones as potential of earthquake activities are identified in the assessment …

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The Amplification Of Seismic Waves In Tehran, S. M. Mir Mohammad Hosseini Apr 1995

The Amplification Of Seismic Waves In Tehran, S. M. Mir Mohammad Hosseini

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

Vibrations of the bedrock due to earthquakes are transferred to the ground level via different soil layers. The arrived waves in the ground surface which affect the superstructures are usually stronger than those induced in the bedrock, depending on the geological and geotechnical characteristics of the soil layers. In this paper the influence of different geotechnical parameters of a site on the amplification of earthquake waves are investigated using the mathematical equations of wave’s propagation in a visco-elastic half-space medium. A special computer software was used to analyze the geotechnical data of a site in the western part of Tehran. …

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Third International Conferences On Recent Advances On In Geotechnical Earthquake Engineering And Soil Dynamics, Multiple Authors Apr 1995

Third International Conferences On Recent Advances On In Geotechnical Earthquake Engineering And Soil Dynamics, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Past Proceedings: Third International Conference On Recent Advances In Geotechnical Earthquake Engineering And Soil Dynamics, St. Louis (1995), Multiple Authors Apr 1995

Past Proceedings: Third International Conference On Recent Advances In Geotechnical Earthquake Engineering And Soil Dynamics, St. Louis (1995), Multiple Authors

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

No abstract provided.

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Soil-Response Analyses For The 1990 South-East Sicily Earthquake, M. Maugeri, S. M. Frenna Apr 1995

Soil-Response Analyses For The 1990 South-East Sicily Earthquake, M. Maugeri, S. M. Frenna

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

In spite of relative low, magnitude comparing with the historical destructive earthquake of the region, South-East Sicily was damaged by the 13/12/1990 earthquake, with estimated magnitude of 5.4; in the town of Augusta and Lentini even concrete buildings had severely damaged. The present paper deals with results from analytical soil amplification studies using actual soil profiles from Augusta site. To investigate dynamic soil behavior, field test as cross-hole and down hole were performed, and laboratory test as resonant column and cyclic triaxal tests were executed. Results indicate that, when using proper laboratory and field measurements of soil properties, one-dimensional soil …

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Elastic Wave Propagation In Inhomogeneous Media Due To Surface Shock Loading, D. S. Shridhar, V. S. Chandrasekaran Apr 1995

Elastic Wave Propagation In Inhomogeneous Media Due To Surface Shock Loading, D. S. Shridhar, V. S. Chandrasekaran

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

Wave propagation due to shock loading on the surface of elastic inhomogeneous half-space is considered. The shock loading is applied over a circular area in the form of suddenly applied vertical and shear stress. The analysis makes use of semi-analytical finite element formulation and explicit time integration technique. Extrapolation algorithm is employed for modelling the transmitting boundaries. Details of numerical procedure adopted are given and results of typical analysis are presented and discussed.

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Finite Element Method For Love Wave Dispersion In Soils, T. D. Xia, S. M. Wu Apr 1995

Finite Element Method For Love Wave Dispersion In Soils, T. D. Xia, S. M. Wu

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

The secular equation of Love wave is conducted by using combined finite element method and semi-infinite element method (or analytical method) in this paper. The formulation of calculating displacement distributions is also generated. The soils can be more complicate than analytical method. The results indicate that the presented method is more advantageous than analytical method. Some numerical examples are employed to illustrate its applicability and corresponding accuracy.

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Elastic Models Of Rock Due To Explosion Pressures, Sanga Tangchawal Apr 1995

Elastic Models Of Rock Due To Explosion Pressures, Sanga Tangchawal

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

Basic theories of wave pulse initiated from conventional blasting were reviewed. Mechanics of various stress wave forms of explosion pressure were proved. A new suggested solution of displacement potential by Rinehart instead of Sharpe or Duvall's suggestion, was used to find the optimum solution. From the mathematical research models, in which they were written as a package program in C language and used Microsoft visual basic as user interface, they proved that a typical cylindrical charge explosion in a bench may take on some of the characteristics of a concentrated charge explosion.

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Experimental And Numerical Investigation On Vibration Screening By In-Filled Trenches, S. Ahmad, J. Baker, J. Li Apr 1995

Experimental And Numerical Investigation On Vibration Screening By In-Filled Trenches, S. Ahmad, J. Baker, J. Li

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

In-filled concrete and soil-bentonite trenches have been used in practice for many years as wave barriers to reduce transmission of moderate to high frequency ground vibrations generated by machine foundations or traffic. An experimental investigation on the influence of various geometrical and material parameters on vibration screening effectiveness of in-filled barriers has been conducted. The experimental data are compared with numerical (BEM) Solutions as well as with design formulas of Ahmad and Al-Hussaini (1991).

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Dynamic Tests Of Foundations With Explosives, V. K. Lekarkin, A. G. Wilfand, D. D. Akhmedov, F. F. Zekhniev, B. B. Zukhurdinov Apr 1995

Dynamic Tests Of Foundations With Explosives, V. K. Lekarkin, A. G. Wilfand, D. D. Akhmedov, F. F. Zekhniev, B. B. Zukhurdinov

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

The dynamic tests results of bearing capacity of bases disposed of foundation on the tampered out trenches in subsiding soils fulfilled by means of explosions are represented. The main principles are stated which concern the dynamical lasting methods of the "soil-structure" system in subsiding soils by the modelled seismic load fulfilled by means of explosions; the principles concern the analysis of results of dimensions. The functional scheme and the description of work of the device for automatic controlling the seismic explosive load are represented.

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Control Of Vertical Nonlinear Vibrations Of Foundations, M. Abdel-Rohman, H. Al-Sanad Apr 1995

Control Of Vertical Nonlinear Vibrations Of Foundations, M. Abdel-Rohman, H. Al-Sanad

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

Sandy soil behaves nonlinearly which affects on the vibration of machine foundations. In order to control the foundation response, damping can be introduced using tuned mass dampers. It is shown the foundation nonlinear vertical response using two different dynamic soil models, and the control of the response by linking linear or nonlinear tuned mass dampers to the foundation.

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Northridge (California) Earthquake: Unique Ground Motions, Mehmet Celebi Apr 1995

Northridge (California) Earthquake: Unique Ground Motions, Mehmet Celebi

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

The Northridge (California) earthquake of 17 January 1994 generated numerous strong-motion records that are unique because they have: (a) very high peak accelerations and (b) long-duration pulses. Using digitized data available to date, the significant aspects of the strong-motions are preliminarily reviewed and their impact on earthquake engineering are discussed.

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Performance Of Port Facilities During The Northridge Earthquake, K. K. Muraleetharan, S. V. Jagannath, K. Arulmoli, D. A. Thiessen Apr 1995

Performance Of Port Facilities During The Northridge Earthquake, K. K. Muraleetharan, S. V. Jagannath, K. Arulmoli, D. A. Thiessen

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

During the January 17, 1994, Northridge earthquake, two of the Port of Los Angeles' facilities called Berths 121-126 and Pier 300 sustained moderate damage. Lateral displacement of dikes up to five inches and liquefaction of hydraulic fills were observed. Several geotechnical analyses from simplified SPT -based method to sophisticated fully-coupled analyses are presented. Observed lateral displacements are predicted reasonably well by the fully-coupled analysis procedure and an intermediate analysis procedure which incorporates some results from a fully-coupled analysis in to a simplified Newmark-type deformation analysis. The potential for higher pore pressure generation underneath the dike compared to a level ground …

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Lessons Learned From Liquefaction And Lifeline Performance During San Francisco Earthquakes, T. D. O'Rourke, J. W. Pease Apr 1995

Lessons Learned From Liquefaction And Lifeline Performance During San Francisco Earthquakes, T. D. O'Rourke, J. W. Pease

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

This paper presents information about subsurface conditions, liquefaction-induced ground movements, and lifeline performance during the 1906 and 1989 earthquakes in San Francisco. Three sites of soil liquefaction and pipeline damage during both earthquakes are evaluated, including the Marina, South of Market, and Mission Creek areas. Important lessons are summarized about the effects of transient lateral shear strains on pipeline performance, post liquefaction consolidation, use of submerged fill thickness as a microzonation technique for predicting liquefaction severity and potential pipeline damage, the relationship between surface manifestations of liquefaction and subsurface geometry of deposits, and factors affecting the magnitude of lateral spread.

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Clay Behavior, Ground Response And Soil-Structure Interaction Studies In Mexico City, Miguel P. Romo Apr 1995

Clay Behavior, Ground Response And Soil-Structure Interaction Studies In Mexico City, Miguel P. Romo

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

This paper focuses on the most relevant results of recent investigations carried out on the behavior of Mexico City clays under dynamic loading, on the effects of soil site conditions and on the evaluation of the dynamic soil-structure interaction phenomenon. The paper shows the impact of these studies upon foundation engineering practice in earthquake-prone regions where clayey deposits exist, and advances simple, yet accurate, procedures to develop site-dependent, building-specific input motions for the design of structures in the Valley of Mexico. It discusses recent seismic observations that clarify the origin of the long coda observed in several records obtained in …

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