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Articles 2161 - 2190 of 4583

Full-Text Articles in Engineering

Static And Dynamic Response Analysis Of A High Rock-Fill Dam With A Clay Core, Gang Wang, Bing-Yin Zhang, Jian-Min Zhang Apr 2004

Static And Dynamic Response Analysis Of A High Rock-Fill Dam With A Clay Core, Gang Wang, Bing-Yin Zhang, Jian-Min Zhang

International Conference on Case Histories in Geotechnical Engineering

Stress strain analysis based on Biot’s consolidation theory is performed for Nuozhadu dam, which is a high rock-fill clay-core dam located in the Langcangjiang River in Yunnan province, China. Attention is mainly focused on arching effect and possibility of hydraulic fracturing of the core. Equivalent linear approach is employed to evaluate the seismic response of the dam under design earthquakes, and two empirical formulas relating residual shear and volumetric strain to cyclic stress and strain history are proposed to evaluate the permanent deformation. It is found that: 1) the modulus ratio of the clay in the core to rockfills around …

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Geotechnical Investigation Of The Hollóháza Landslide Case, I. Szabó, A. Szabó, T. Madarász Apr 2004

Geotechnical Investigation Of The Hollóháza Landslide Case, I. Szabó, A. Szabó, T. Madarász

International Conference on Case Histories in Geotechnical Engineering

Hollóháza is a little mountain village in North-East Hungary. Following a long wet period in 1999 the largest mass-wasting event of the 20th century occurred. The total volume of mobilized earth material was over 1.5 million m3. One major concern of problem management was that the value of the damaged infrastructure was less than the total costs of restoration and stabilization, while the natural potential of the settlement is outstanding. After investigating the causes of the landslide the cheapest effective solution had to be found. Hollóháza is surrounded with the residuals of a 4-6 km diameter volcanic caldera. The settlement …

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Stože Landslide – A Case History, Stanislav Lenart Apr 2004

Stože Landslide – A Case History, Stanislav Lenart

International Conference on Case Histories in Geotechnical Engineering

The paper describes the Stože landslide that occurred in western Slovenia in November, 2000. It presents the landslide particularities and laboratory tests results. A numerical analysis of the slope failure was performed. It indicated the important role of the ground water level, and the dependence of slope stability upon it. Special laboratory equipment, a large-scale shear cell, was constructed in order to test the landslide material and to indicate the roles of the water content and loading velocities on the residual shear strength of material. A testing method is presented. It was assumed that the behaviour of material with a …

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Landslide Stabilization At Missouri Route K Bridge Over Blackwater River, Scott M. Olson, Alan Miller, Kenneth M. Berry, Jay Bestgen Apr 2004

Landslide Stabilization At Missouri Route K Bridge Over Blackwater River, Scott M. Olson, Alan Miller, Kenneth M. Berry, Jay Bestgen

International Conference on Case Histories in Geotechnical Engineering

In May 2002, a landslide on the south bank of the Blackwater River damaged the Missouri Route K bridge that crosses it. A flood on the river triggered the landslide. Based on the field investigation and stability back-analysis, it appeared that the landslide actually consisted of two separate slides – a shallow slide triggered by rapid drawdown of the river and a deep slide triggered by artesian water pressures in a subsurface gravel layer. A rock berm that was keyed into the gravel was constructed to stabilize the slope. The rock toe berm was designed to resist both the shallow …

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Lessons Learned From A Full-Scale Dyke Failure Test, André R. Koelewijn, Gijs J. C. M. Hoffmans, Meindert A. Van Apr 2004

Lessons Learned From A Full-Scale Dyke Failure Test, André R. Koelewijn, Gijs J. C. M. Hoffmans, Meindert A. Van

International Conference on Case Histories in Geotechnical Engineering

A full-scale failure test has been performed on an old river dyke in the Netherlands, to determine its actual strength against failure due to the uplift mechanism and to validate the Van model for the stability analysis of dykes prone to uplift induced failure. The test has been a success and clearly showed the relevance and significance of the uplift mechanism. In combination with earlier verifications, the Van model was found to be suitable, which has already lead to significant reductions on dyke reinforcement projects. The large gap between the actual strength and the calculated strength was confirmed. This gap …

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Numerical Analyses Of The Performance Of The Drtijščica Earth Dam, Mojca Ravnikar Turk, Janko Logar Apr 2004

Numerical Analyses Of The Performance Of The Drtijščica Earth Dam, Mojca Ravnikar Turk, Janko Logar

International Conference on Case Histories in Geotechnical Engineering

A regulating dam named Drtijščica was constructed in 2002. This earth dam consists of a clay core, a random fill of silty and coarse material on the downstream side, and of rock fill on the upstream side. The crest length is 265m and the dam base thickness is 150 m. The height above the lowest foundation level is around 20 metres. The subsoil consists of a layer of loose, highly compressible clayeysilty material, three to five meters thick, overlying bedrock made of tectonically altered clayey shists and siltstones. During construction of the dam, settlements of the subsoil were measured at …

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Drake Lake Dam — A Performance Case History, Ted D. Bushell, William Butler, William H. Walton, Ravi Mathur Apr 2004

Drake Lake Dam — A Performance Case History, Ted D. Bushell, William Butler, William H. Walton, Ravi Mathur

International Conference on Case Histories in Geotechnical Engineering

Drake Lake Dam was constructed during the summer of 2000 as part of the development of the Jim Edgar/Panther Creek State Fish and Wildlife Area in Cass County, Illinois. The earthen dam on a natural soil foundation has a length of 450 feet and a height of 45 feet with 3H:1V upstream and downstream slopes. The dam has a principal spillway structure consisting of a cast-in-place concrete drop inlet tower, a 36-inch reinforced concrete pipe (RCP) outlet pipe, and an impact-basin-type energy dissipater/outlet structure. Construction of the earthen embankment began in July 2000 and ended in September 2000. During the …

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Construction Of Filled Hill For Downhill Ski Racing Complex In Moscow, Yu. Bagdasarov, V. Krutov, I. Popsuenko Apr 2004

Construction Of Filled Hill For Downhill Ski Racing Complex In Moscow, Yu. Bagdasarov, V. Krutov, I. Popsuenko

International Conference on Case Histories in Geotechnical Engineering

In 1997-2002 large scope soil excavations for construction of Business Center ‘Moscow-City’, Third Highway Circle and other large structures with deep foundations were carried out in Moscow. The soil excavated out of 180,000.00 m³ pits was dumped on a disposal site originally designed as a temporary soil storage site in the Southwestern suburbs of Moscow. Snow, ice and clots of frozen soil were left untouched and piling was effected over the frozen surface. This spoil heap was a mass of exceedingly wet sandy clay heterogeneous as to composition and density with low strength and deformation properties, including crushed concrete and …

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Seismogenic Landslides In Himalaya With Special Reference To Uttaranchal, Kishor Kumar, Dinesh Sati Apr 2004

Seismogenic Landslides In Himalaya With Special Reference To Uttaranchal, Kishor Kumar, Dinesh Sati

International Conference on Case Histories in Geotechnical Engineering

The continued compression between Indian and Asian continental plates which ultimately led to the collision of the two, is regarded as the most likely phenomenon responsible for the emergence of Himalaya. The stress build up across the strike of the orogen produced regional north-south compressional structures including two major tectonic boundaries/ discontinuities namely the Main Central Thrust (MCT) and the Main Boundary Thrust (MBT). In the mountain building process the seismic outbursts (earthquakes) and tectonic adjustments are indicators of strain release. In the last century, this region has experienced four major earthquakes measuring above 8 in the Richter Scale besides …

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Three Dimensional Dynamic Analysis Of Alborz Dam With Asphalt And Clay Cores, M. H. Baziar, C. M. Merrifield, Sh. Salemi, T. Heidari Apr 2004

Three Dimensional Dynamic Analysis Of Alborz Dam With Asphalt And Clay Cores, M. H. Baziar, C. M. Merrifield, Sh. Salemi, T. Heidari

International Conference on Case Histories in Geotechnical Engineering

Alborz rockfill dam with a clay core is under construction in North of Iran, an area of heavy rainfall. Because of the difficulties in the construction of a clay core in a wet area, an alternative for the watertight element (asphalt core) was considered. During the design of Alborz dam, a dynamic response analysis of the asphalt core was performed using two-dimensional modeling based on the equivalent linear method. Considering the shortage of study on the seismic behavior of asphalt core dams and also the high level of risk of earthquakes in Iran, it was necessary that the dynamic behavior …

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Analysis And Field Monitoring Of Slope Stability In Unsaturated Pyroclastic Soil Slopes In Napoli, Italy, Aldo Evangelista, Anna Scotto Di Santolo Apr 2004

Analysis And Field Monitoring Of Slope Stability In Unsaturated Pyroclastic Soil Slopes In Napoli, Italy, Aldo Evangelista, Anna Scotto Di Santolo

International Conference on Case Histories in Geotechnical Engineering

The hills rising in the urban area of Napoli (Italy ) are the products of eruptive activity in the volcanic areas of Campi Flegrei and Somma Vesuvio. The unsaturated pyroclastic cover, weathered and interbedded with paleosols , is frequently affected by instabilityphenomena that have slight thickness and extension. The observed landslides can be classified as complex phenomena: the movements start as a translational or rotational sliding or as a rock-fall and evolve as the debris flows. 90% of the cases occur during or after severe rainfalls. As is well known , the stability of slopes is affected by climatic conditions, …

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Numerical Assessment Of An Estimated Slip Surface, Locke Island Landslides, Columbia River, South-Central Washington State, Usa, Ashok K. Chugh, Robert L. Schuster, Peter M. Rohrer Apr 2004

Numerical Assessment Of An Estimated Slip Surface, Locke Island Landslides, Columbia River, South-Central Washington State, Usa, Ashok K. Chugh, Robert L. Schuster, Peter M. Rohrer

International Conference on Case Histories in Geotechnical Engineering

Results of slope stability analyses for an inferred slip surface in a landslide along the Columbia River in the State of Washington are presented. The numerical analyses were made using limit-equilibrium-based computer program SSTAB2 and a commercially available continuum-mechanics-based computer program, FLAC. For the known and best understood/estimated field conditions, results of SSTAB2 analyses indicate validity of the inferred slip surface. However, the same is not true with the results of FLAC. Reasons for the differences in results from the two essentially independent methods of analysis are discussed. Preference for use of one method over the other in studying occurrence …

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Dutch Dike Breach, Wilnis 2003, S. Van Baars Apr 2004

Dutch Dike Breach, Wilnis 2003, S. Van Baars

International Conference on Case Histories in Geotechnical Engineering

In August 2003, after a very dry and warm summer, one of the dikes along a canal in The Netherlands failed at night. Because of this dike breach, the water in the canal started to run into a housing quarter of the village Wilnis, which is about 30 km Southeast of Amsterdam. A local contractor immediately started to close off the canal. By the time this was finished, 600 houses were already half a meter under water. The 2000 residents were evacuated in the early morning. Almost all residents could return to their homes the same evening after the water …

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Slope Failure And Piping Potential Due To Root Decomposition In An Aged Embankment Dam, Ali M. Oskoorouchi, Philip J. Lane Apr 2004

Slope Failure And Piping Potential Due To Root Decomposition In An Aged Embankment Dam, Ali M. Oskoorouchi, Philip J. Lane

International Conference on Case Histories in Geotechnical Engineering

Lake Storey Embankment Dam originally built in 1929 to provide water for steam locomotives. This 133-acre public lake is located near Galesburg in Knox County, Illinois. The dam is a zoned embankment (with clay cores on each side of a concrete core wall, 12 inches thick), 51 ft high above the streambed, approximately 850 ft long, with a concrete free ogee spillway. Numerous minor to moderate damaged spots including a moderate size downstream slope failure have been detected during the dam inspection of Year 2000. This paper discusses the results of the investigation to identify the problems and the proposed …

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Comparison Of Soil Classification Methods Using Cpt Results, M. H. Baziar, M. Esna-Ashari, H. Saleh Zadeh Apr 2004

Comparison Of Soil Classification Methods Using Cpt Results, M. H. Baziar, M. Esna-Ashari, H. Saleh Zadeh

International Conference on Case Histories in Geotechnical Engineering

A series of cone penetration test were conducted in the southeast of Tehran to assess the liquefaction potential in this area. At the same time, after sounding of each cone penetration test, soil samples were also taken from different depths of boreholes to visually verify the soil classification. Seventy four samples from twenty boreholes were taken and their soil characteristics were obtained. To classify the soil layers, using recorded data, two various soil behaviour classification charts proposed by Robertson and Wride (1988), and Marr (1981) were examined which for some cases different results were obtained. In this paper validity of …

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Reduction Of Liquefaction Susceptibility Under Existing Structures By Permeation Grouting, Sami Arsoy, Akın Önalp Apr 2004

Reduction Of Liquefaction Susceptibility Under Existing Structures By Permeation Grouting, Sami Arsoy, Akın Önalp

International Conference on Case Histories in Geotechnical Engineering

1999 Izmit earthquake has shown that a vast number of buildings were built over liquefiable silty soils in Adapazari, Turkey. Most of these buildings have been classified as “moderately” damaged, and mitigation of the liquefaction risk has been made mandatory before these structures are reoccupied. A literature review revealed that low pressure permeation grouting has been used successfully for this purpose. The effectiveness of this method is investigated in this study through geophysical measurements before and after the soil improvement at four different sites in downtown Adapazari . The results of this study indicate that the shear wave velocity of …

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A Study On The Performance Of A Reinforced Dike Section With Geogrid During The Tottori-Ken Seibu Earthquake, Yasushi Sasaki, Takashi Fukuwatari, Tomoharu Tsuji, Seiji Kano, Shun-Ichi Sawada, Hideyasu Uekuma Apr 2004

A Study On The Performance Of A Reinforced Dike Section With Geogrid During The Tottori-Ken Seibu Earthquake, Yasushi Sasaki, Takashi Fukuwatari, Tomoharu Tsuji, Seiji Kano, Shun-Ichi Sawada, Hideyasu Uekuma

International Conference on Case Histories in Geotechnical Engineering

A dike section reinforced with geogrid against soil liquefaction was hit by a damaging earthquake in 2000. As the site condition of this dike section was anticipated to be liquefied by an earthquake, so it was decided to take remedial measures against possible damage. However, since the hinterland of this newly constructed dike section was a rural area, primary objective of the treatment design was set to avoid the stretching effect caused by the liquefaction. For this purpose, three sheets of geogrid were laid at the bottom of the embankment. It was detected that 85% length of the dike section …

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Geotechnical Earthquake Engineering For The Great River Bridge, Scott M. Olson, Thomas L. Cooling, Steven T. Hague Apr 2004

Geotechnical Earthquake Engineering For The Great River Bridge, Scott M. Olson, Thomas L. Cooling, Steven T. Hague

International Conference on Case Histories in Geotechnical Engineering

The proposed Great River Bridge is a 1400-foot long cable-stay structure that will be constructed over the Mississippi River between Desha County, Arkansas and Bolivar County, Mississippi. Including the bridge approach structures and approach embankments, the total structure length is approximately 23,500 feet. Seismic issues have controlled most of the structural design. Design ground motions for three typical subsurface profiles were developed and resulted in near-surface peak accelerations between 0.23 and 0.26g. Level ground liquefaction analyses indicated widespread liquefaction in an abandoned channel of the river and sporadic liquefaction elsewhere. Seismic slope stability and lateral spreading analyses indicated minor displacements …

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Estimation Of Phreatic Line Using Dimensional Analysis, D. R. Phatak, S. R. Pathak, K. C. Birid Apr 2004

Estimation Of Phreatic Line Using Dimensional Analysis, D. R. Phatak, S. R. Pathak, K. C. Birid

International Conference on Case Histories in Geotechnical Engineering

A new technique using dimensional analysis (D.A.) is presented here to draw profile of phreatic line through an earthen dam. A universal equation is formulated using D.A. to get numerous points on a steady-state phreatic surface. The prediction of phreatic line using D.A. is then compared with those of conventional methods by Kozeny, A. Casagrande, Stello and also with centrifuge model test results and large scale prototype field results to evaluate applicability of this equation. It has been observed that D.A. can predict the results reasonably well. Thus Dimensional Analysis method can prove to be an easy and sufficiently accurate …

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Propagation Characteristics Of Seismic Wave While Transiting Interlining In Soil Medium, Yang Xianjian, Gao Guangyun, Xu Hongyu Apr 2004

Propagation Characteristics Of Seismic Wave While Transiting Interlining In Soil Medium, Yang Xianjian, Gao Guangyun, Xu Hongyu

International Conference on Case Histories in Geotechnical Engineering

Based on the theory of wave and the Snell theorem, propagation characteristics of seismic wave, three kinds of elastic body waves, is studied when they pass through soil/elastic solid medium including elastic thin plan intercalation in half-space. The analytic solution of the amplitude rate is the rate of the amplitude of the wave behind the intercalation to that of the incident wave. Compared with the field data, the analytic results are beneficial, affected by soft clay stratum, at the Nankai District of Tianjin Municipality caused by the 1976 Tangshan earthquake (had a magnitude of 7.8). In this area, however, damage …

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Liquefaction Evaluations At The Savannah River Site. A Case History, M. R. Lewis, M. D. Mchood, I. Arango Apr 2004

Liquefaction Evaluations At The Savannah River Site. A Case History, M. R. Lewis, M. D. Mchood, I. Arango

International Conference on Case Histories in Geotechnical Engineering

Over the past decade, liquefaction assessments have been performed for many existing and planned critical facilities at the Department of Energy’s Savannah River Site (SRS). The assessments incorporated site-specific Cyclic Resistance Ratio (CRR) and Ks with the use of the cone penetration test (CPT). The SRS-specific CRR and Ks were developed from laboratory testing of carefully collected samples. Test results show SRS soils have increased liquefaction resistance of two to three times when compared to standard literature for Holocene-age deposits. This increase in strength can be attributed to many factors such as aging and overconsolidation. The purpose of this paper …

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Simulation Of Damage Associated To The 1999 Armenia Earthquake Using Ie-Riss System, Gloria Estrada, Juan Jaramillo Apr 2004

Simulation Of Damage Associated To The 1999 Armenia Earthquake Using Ie-Riss System, Gloria Estrada, Juan Jaramillo

International Conference on Case Histories in Geotechnical Engineering

IE-RISS is a sophisticated system developed by the consultant company INTEGRAL and EAFIT University, keeping in mind worldwide needs of understanding and managing earthquake risk. IE-RISS system analyzes earthquake risk through a probabilistic approach, taking into account detailed information about seismic hazard, soil properties and its associated earthquake ground response, and building characteristics. This tool allows the development earthquake disaster prevention programs through identification of critical zones or regions, definition of potential damage distribution and loss estimates. Quantification of damage associated to the 1999 Armenia earthquake in Colombia made possible to evaluate the validity and reliability of IE-RISS system in …

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A Step Into The Definition Of The Seismic Risk For The City Of Benevento (Italy), Filippo Santucci De Magistris, Anna D'Onofrio, Stefania Sica Apr 2004

A Step Into The Definition Of The Seismic Risk For The City Of Benevento (Italy), Filippo Santucci De Magistris, Anna D'Onofrio, Stefania Sica

International Conference on Case Histories in Geotechnical Engineering

This paper gives a contribution in the definition of the seismic hazard for the city of Benevento in Southern Italy, from a geotechnical engineering viewpoint. To pursue this goal, an extensive geotechnical characterization of the city subsoil was achieved collecting data available at the Department of Geotechnical Engineering, University of Napoli and Benevento municipal technical office. Attention was paid in defining strain dependent shear stiffness and damping ratio for the geomaterials present in the urban area. A new method to correct the Masing criteria was adopted. Numerical analyses were performed considering the subsoil as a continuous one-phase equivalent linear medium. …

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Problems Associated With The Assessment Of Local Site Effects Through A Multidisciplinary Integrated Study: The Case Of Fivizzano’S Town (Italy), Claudio Cherubini, Vittorio D’Intinosante, Maurizio Ferrini, Carlo Lai, Diego Carlo Lo Presti, Mario Luigi Rainone, Patrizio Signanini, Giovanna Vessia Apr 2004

Problems Associated With The Assessment Of Local Site Effects Through A Multidisciplinary Integrated Study: The Case Of Fivizzano’S Town (Italy), Claudio Cherubini, Vittorio D’Intinosante, Maurizio Ferrini, Carlo Lai, Diego Carlo Lo Presti, Mario Luigi Rainone, Patrizio Signanini, Giovanna Vessia

International Conference on Case Histories in Geotechnical Engineering

The evaluation of local site effects, by means of ground response analyses, is a very complex and difficult task, which requires a multidisciplinary approach. This is operative philosophy expressed by VEL Project (Valutazione degli Effetti Locali), sponsored by Tuscany Region, to the aim to seismic risk characterization in the main seismic areas (i.e. Garfagnana, Lunigiana, Amiata, Valtiberina and Mugello). One of the most important urban centres, involved in the multidisciplinary activity of the VEL project, is certainly the town of Fivizzano located nearby the city of Massa, which was strongly damaged during the earthquake of September 1920 (the strongest seismic …

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A Detailed Study On The Liquefaction-Induced Settlement Of Timber Houses During The 2000 Tottoriken-Seibu Earthquake, Susumu Yasuda, Takashi Hitomi, Takao Hashimoto Apr 2004

A Detailed Study On The Liquefaction-Induced Settlement Of Timber Houses During The 2000 Tottoriken-Seibu Earthquake, Susumu Yasuda, Takashi Hitomi, Takao Hashimoto

International Conference on Case Histories in Geotechnical Engineering

More than 100 timber houses settled and tilted due to liquefaction at a housing development during the 2000 Tottoriken-seibu earthquake in Japan. Among the damaged houses, 47 houses tilted more than 15/1000. Heavily tilted houses were necessary to restore to become horizontal after the earthquake, though several houses, that tilted slightly, were not necessary to restore. The authors studied the boundary of the angle of the restored and non-restored houses. According to the study by the authors, the critical angle of tilting to restore houses was about 10/1000. The authors studied soil conditions also, and found that groundwater level was …

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Environmental Geotechnics To Study A Historical Town, Filippo Ciuffi Apr 2004

Environmental Geotechnics To Study A Historical Town, Filippo Ciuffi

International Conference on Case Histories in Geotechnical Engineering

The present paper summarizes the original approach, the different stages and the most innovative results of an interdisciplinary research activity, carried out on the subsoil of a historical site, in a seismic area, in Italy: the old town of Potenza, capital of the Basilicata Region. The entire Research-work has been designed and implemented within a total period of about 3 years. The paper is divided into twelve paragraphs and is organized logically, so that the reader can follow the development sequence of the different, interdisciplinary activities, detailed in the “Research General Flow-Chart”. After the Introduction [paragraph 1.0.0], the Philosophical Approach …

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The New Resolution Of Foundations In Durres City, Luljeta Bozo Apr 2004

The New Resolution Of Foundations In Durres City, Luljeta Bozo

International Conference on Case Histories in Geotechnical Engineering

Albania is a country with strong earthquakes. There are observed some disastrous earthquakes in the cities of Durres, Vlora and Shkodra. Recently in the city of Durres are built many high – rise buildings in the low or bad soil-conditions. In this paper, we would like to present our experience in the calculation and constructions of foundations in this area with high seismic.

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Nonlinear Dynamic Behavior Of Pile Groups: Effects Of Plasticity Of Soil, B. K. Maheshwari, Kevin Z. Truman Apr 2004

Nonlinear Dynamic Behavior Of Pile Groups: Effects Of Plasticity Of Soil, B. K. Maheshwari, Kevin Z. Truman

International Conference on Case Histories in Geotechnical Engineering

The effects of material nonlinearity of soil on dynamic behavior of a single pile and pile groups are investigated. An advanced plasticity based soil model, HiSS, is incorporated in the finite element formulation. To simulate radiation effects, proper boundary conditions are used. The model and algorithm are verified with analytical results that are available for elastic and elasto-plastic soil models. Analyses are performed for seismic excitation as well as for loads applied on the pile cap and the effect of nonlinearity is investigated. Effects of spacing between piles are investigated. It was found that the effect of soil nonlinearity on …

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Liquefaction Susceptibility: Proposed New York City Building Code Revision, Robert Alperstein, Carl Costantino, Peter Edinger, Michael Greenman, Magued Iskander, Stephen K. Law, Sam Leifer, George Mylonakis, Sissy Nikolaou, Ray Sandiford, Thomas Thomann Apr 2004

Liquefaction Susceptibility: Proposed New York City Building Code Revision, Robert Alperstein, Carl Costantino, Peter Edinger, Michael Greenman, Magued Iskander, Stephen K. Law, Sam Leifer, George Mylonakis, Sissy Nikolaou, Ray Sandiford, Thomas Thomann

International Conference on Case Histories in Geotechnical Engineering

A simplified procedure is presented for evaluating liquefaction susceptibility of cohesionless saturated soils based on available technology. In 2001, a Committee of engineers working in the New York City (NYC) area was formed under the direction of the first Author, to review the liquefaction aspects of the 1995 New York City Building Code. The purpose was to gain consensus on a possible revision and augmentation of the exisiting regulations as part of the ongoing Code review by the Structural Engineers Association of New York (SEAoNY). This article summarizes the recommendations of the Committee, as compiled in 2002. The following topics …

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Displacement Of Bridge Abutment Under Earthquake Loading, Yulman Munaf, Shamsher Prakash Apr 2004

Displacement Of Bridge Abutment Under Earthquake Loading, Yulman Munaf, Shamsher Prakash

International Conference on Case Histories in Geotechnical Engineering

Bridge abutments may experience significant displacements during earthquakes. A two-dimensional model has been developed considering sliding and overturning displacement and 1) strain dependent soil stiffness and soil damping and 2) horizontal and vertical time dependent seismic load. The displacements are computed from the static equilibrium position where the seismic backfill force increments are considered for determining the active earth force acting behind the abutment wall. This means that the permanent displacement increment occurred if the acceleration acts towards the backfill and the abutment wall moves away from the backfill. The total displacement at the top of bridge abutment is calculated …

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