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Articles 31 - 60 of 358
Full-Text Articles in Geotechnical Engineering
General Report — Session 9: Model And Full Scale Tests Of Geotechnical Structures Including Centrifuge Tests, Bruce L. Kutter, S. P. Gopal Madabhushi
General Report — Session 9: Model And Full Scale Tests Of Geotechnical Structures Including Centrifuge Tests, Bruce L. Kutter, S. P. Gopal Madabhushi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Soil-Structure Interaction Effects On Elastic And Inelastic Structures, George Gazetas, George Mylonakis
Soil-Structure Interaction Effects On Elastic And Inelastic Structures, George Gazetas, George Mylonakis
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The paper presents a critical assessment of the currently prevailing view of structural engineers, as expressed in seismic codes, that the role of SSI is always beneficial for the design seismic forces developing in a structure. Using recorded strong ground motions and theoretical analyses it is shown that, in certain seismic and soil environments, an increase due to SSI in the fundamental period of a moderately flexible structure may have a detrimental effect on seismic demand, contrary to the conclusion drawn on the basis of idealized (“average”) code spectra. Using a simple 2-dof system and a number of actual ground …
Full-Scale Lateral Load Testing Of Deep Foundations Using Blast-Induced Liquefaction, Kyle M. Rollins, Scott A. Ashford, J. Dusty Lane
Full-Scale Lateral Load Testing Of Deep Foundations Using Blast-Induced Liquefaction, Kyle M. Rollins, Scott A. Ashford, J. Dusty Lane
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
To improve our understanding of the lateral load behavior of deep foundations in liquefied soil, a series of full-scale lateral load tests have been performed at the National Geotechnical Experimentation Site (NGES) at Treasure Island in San Francisco, California. The ground around the test piles was liquefied using explosives prior to lateral load testing. The goal of the project is to develop load-displacement relationships for bored and driven piles and pile groups in liquefied sand under full-scale conditions for improved and non-improved ground. The results of this investigation confirmed that controlled blasting techniques could successfully be used to induce liquefaction …
The Prediction Of Liquefaction Damages To A Large Span Bridge On Karoon River, Iran, S. M. Mir Mohammad Hosseini
The Prediction Of Liquefaction Damages To A Large Span Bridge On Karoon River, Iran, S. M. Mir Mohammad Hosseini
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Several damages have been imposed to bridges due to liquefaction of the soil layer in the position of their foundations. However, there is not a specific world - wide provisions for design of bridges in these conditions. In this paper the results of evaluating liquefaction potential and the consequence damages which is likely to happen for a large span bridge (Shirin-Shahr Bridge) to be constructed on the Karoon river (one of the main river in the south-western part of Iran) are presented. Since the liquefaction potential of a site depends not only on the geotechnical characteristics, but on the intensity …
Liquefaction And Ground Failure During The 1998 Adana (Turkey) Earthquake And Lab Model Simulations, Korhan Adalier
Liquefaction And Ground Failure During The 1998 Adana (Turkey) Earthquake And Lab Model Simulations, Korhan Adalier
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Although the June 27, 1998 Adana (Turkey) earthquake event was moderate in magnitude (5.9 on the Richter scale) and in the resulting damage, it contains significant valuable data for geotechnical earthquake engineering. The coincidence of the earthquake epicenter and the fault with a very vulnerable geological surface formation - thick alluvial deposits of Ceyhan River containing loose sand-silt layers, accounted for substantial thickness and area1 distribution of liquefied sediments. Consequently, liquefaction associated ground deformations such as lateral spreading, flow failures, ground fissures and extensional cracking, sand boils, ground subsidence and slope failures were widespread. This paper presents and analyses the …
Simplified Evaluation For Dynamic Layered Soils-Structure Interaction, Ga Zhang, Jian-Min Zhang
Simplified Evaluation For Dynamic Layered Soils-Structure Interaction, Ga Zhang, Jian-Min Zhang
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
An analytical method is presented or the evaluation of dynamic soil-structure response under a simpler condition where a structure is semi-buried in level ground of layered soils. Formulas are proposed to determine the lateral soil-wall displacement and corresponding earth pressures against the sidewalls of the structure during an earthquake. The key factors affecting the dynamic response of the soil-structure system are also discussed
Critical Acceleration And Seismic Displacement Of Vertical Gravity Walls By A Two Body Model, Constantine A. Stamatopoulos, Eleni G. Velgaki
Critical Acceleration And Seismic Displacement Of Vertical Gravity Walls By A Two Body Model, Constantine A. Stamatopoulos, Eleni G. Velgaki
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Under the assumption that as a result of earthquake loading the backfill behind a gravity wall reaches an active state, and with further increase in the earthquake acceleration the wall slides outwards, the soil-wall system consists of two bodies, each sliding along a different inclination: (a) the active soil wedge that slides with the inclination of least resistance in the backfill, and (b) the wall that slides along the soil-wall boundary at the base. This paper first gives the equation of motion of the 2-block sliding system described above that models the seismic response of vertical gravity walls retaining dry …
Seismic Displacements Of Rigid Retaining Walls, Yingwei Wu, Shamsher Prakash
Seismic Displacements Of Rigid Retaining Walls, Yingwei Wu, Shamsher Prakash
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Rigid retaining walls experience significant displacements during earthquakes. Several investigations have developed 1-D and 2-D models to predict displacements. A critical review of the state of the art shows that these model may not predict realistic displacement Wu (1999). A new 2-D model, which considers strain dependent soil stiffness and material damping, sliding and rocking motions, and practical field water conditions behind the wall as per Eurocode (1994) have been presented. Typical results are included. A comparison of prediction and performance of a centrifuge model has shown good agreement. This model represents a considerable advance over the existing solutions and …
Investigation Of Seismic Response Of Reinforced Soil Retaining Walls, Kianoosh Hatami, Richard J. Bathurst
Investigation Of Seismic Response Of Reinforced Soil Retaining Walls, Kianoosh Hatami, Richard J. Bathurst
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Dynamic response of a segmental (modular block) retaining wall system to recorded ground motions is investigated. The magnitude and characteristics of wall response are compared to those obtained under harmonic input base acceleration. The calculated maximum lateral displacement and reinforcement load of the segmental retaining wall mode1 subjected to a single frequency, harmonic input acceleration were considerably larger than the corresponding values obtained using a number of earthquake accelerograms with comparable predominant frequencies. It is concluded that the random characteristic of actual ground acceleration may partly explain the relatively good performance of reinforced-soil retaining wall systems that were designed without …
On The Seismic Earth Pressure Reduction Against Retaining Structures Using Lightweight Geofoam Fill, Hemanta Hazarika, Juichi Nakazawa, Hiroshi Matsuzawa, Dawit Negussey
On The Seismic Earth Pressure Reduction Against Retaining Structures Using Lightweight Geofoam Fill, Hemanta Hazarika, Juichi Nakazawa, Hiroshi Matsuzawa, Dawit Negussey
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A numerical analysis was carried out for a rigid retaining wall experiencing earthquake loading. The seismic forces acting on the wall was determined by simulating both sinusoidal load as well as the earthquake time history of an actual earthquake. At first considering that the backfill consists purely of sandy soils, the failure zone and the resulting earth pressure were calculated. After observing the failure zone of such backfill, the domain is substituted by lightweight Expanded Polystyrene (EPS) geofoam. The effect of replacing the sand with such lightweight materials on the developed seismic thrust is then examined. The results show that …
Displacement-Based Design Criteria For Gravity Retaining Walls In Light Of Recent Earthquakes, Donald Wotring, Glen Andersen
Displacement-Based Design Criteria For Gravity Retaining Walls In Light Of Recent Earthquakes, Donald Wotring, Glen Andersen
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In the last 20 years many large earthquakes have occurred giving the geotechnical community an abundance of data available for analysis. Richards and Elms (1979) developed a design method for gravity retaining walls based on finite displacements, in accordance with the Newmark (1965) sliding block analysis and the Franklin and Chang (1977) earthquake records analysis. Richards and Elms approximated an upper bound to Franklin and Chang’s curves with an expression that permits a designer to choose an allowable displacement to determine the required wall weight for a particular peak ground acceleration and peak ground velocity. A preliminary investigation of digitized …
Shaking Table Tests Of Seismic Pile-Soil-Pier Structure Interaction, Xiao Wei, Lichu Fan, Xiaoping Wu
Shaking Table Tests Of Seismic Pile-Soil-Pier Structure Interaction, Xiao Wei, Lichu Fan, Xiaoping Wu
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The limited strong earthquake database on structure and pile performance obstructs obtaining further progress in soil-pile structure interaction problem. Model test in laboratory is one of the best ways to expand the database of structure and pile performance during earthquake. In this paper, the problem of pile-soil-pier-structure interaction is investigated by shake table test approach, and on the development of the sandy box for SPSSI test is firstly introduced. Through free field test, the validation of the model container was evaluated by comparisons of soil acceleration records with those numerically calculated by SHAKE91. Secondly, four specimen to simulate friction pile …
Refining Historical Earthquake Data Through Modeling And Scale Model Tests, Jong-Rim Lee, In-Kil Choi, Jeong-Moon Seo, Yo-Yoon Cho
Refining Historical Earthquake Data Through Modeling And Scale Model Tests, Jong-Rim Lee, In-Kil Choi, Jeong-Moon Seo, Yo-Yoon Cho
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This study was performed for the reevaluation of historical earthquake records which occurred in Korea through tests and numerical analyses. For the scale model tests, static and cyclic lateral load tests on wooden frames that constitute a Korean ancient commoner’s house were conducted. Full-scale models of two types of frames were used for testing. Two 1:4 scale models were tested for rock and soil foundation conditions. Scaled real earthquake time histories were inputted for the tests. The peak ground acceleration (PGA) at the collapse of the house at the soil site was 0.25g, whereas PGA for moderate damage at the …
Reproduction Of Lateral Ground Displacements And Lateral-Flow Earth Pressures Acting On Pile Foundations Using Centrifuge Modeling, Masyoshi Sato, Masafumi Ogasawara, Takashi Tazoh
Reproduction Of Lateral Ground Displacements And Lateral-Flow Earth Pressures Acting On Pile Foundations Using Centrifuge Modeling, Masyoshi Sato, Masafumi Ogasawara, Takashi Tazoh
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Dynamic centrifuge model tests were conducted to simulate the seismically-induced displacements of sheet pile quay walls, in order to understand the mechanisms of lateral ground flow of liquefied soil and to evaluate the effects of the lateral-flow earth pressures acting on pile foundations. Two wall-structure-soil model systems were prepared in a laminar container with the inner dimensions of 31.5cm in the height, 47.5cm in the width and 80cm in the length. Shaking table tests were performed under a centrifuge acceleration of 30 g. The first model was designed to simulate the lateral ground flow displacements both during shakings and post …
Geotechnical Factors In Recent Earthquake-Induced Structural Failures In Greece, Aris C. Stamatopoulos, Constantine A. Stamatopoulos, Stavros G. Aneroussis
Geotechnical Factors In Recent Earthquake-Induced Structural Failures In Greece, Aris C. Stamatopoulos, Constantine A. Stamatopoulos, Stavros G. Aneroussis
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A review is made of geotechnical factors that played an important role in three recent earthquake-induced failures, two of which were deadly. The first two catastrophes concern two five-storey hotels that collapsed during the “Alkyonides earthquake” of 24 February 1981 (M=6.7) and the “Egion earthquake” of 15 June 1995 (M=6.2). The third failure is the collapse of a multi-storey factory caused by the “Athens earthquake” of 7 September 1999 (M=5.9). In the first two catastrophes, ground subsidence was estimated by two different methods and was found to be of the order of 0.13 to 0.46 m. These estimates are based …
The Behavior Of Retaining Walls Under 1999 Chi-Chi Earthquake, Yung-Show Fang, Tsang-Jiang Chen, Yu-Chih Yang, Cheng-Chieh Tang
The Behavior Of Retaining Walls Under 1999 Chi-Chi Earthquake, Yung-Show Fang, Tsang-Jiang Chen, Yu-Chih Yang, Cheng-Chieh Tang
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper reports failure of retaining structures related to the 1999 Chi-Chi earthquake. On September 21 of 1999, an earthquake with a magnitude of 7.3 on the Richter scale struck Taiwan. At the site near Tou-Sheh, overturning failure was observed on a 2.5 m-high gravity wall located near the epicenter. At the site near the Temple of Ten-thousand Buddha, a masonry wall constructed with cobble was damaged. Upper part of wall shifted outward about 0.2 m with respect to its lower part. At the site of Cinema-Culture Town, a gravity wall built on top of the Che-Lung-Pu fault was severely …
Soil Column Response And Liquefaction Analyses, Sanjeev Kumar
Soil Column Response And Liquefaction Analyses, Sanjeev Kumar
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper presents the procedure and results of soil column response (ground response) and liquefaction analyses performed for a site located in St. Charles, Missouri. Synthetic earthquake time histories were developed since recorded strong ground motion data for Central United States are not available. For ground response analysis, synthetic earthquake time histories and ground motions from two earthquakes in Canada were used. Synthetic time histories were generated using attenuation relationships for Central and Eastern United States. Liquefaction analysis was performed using the widely used simplified procedure which involves comparison of Cyclic Stress Ratio (CSR) and Cyclic Resistance Ratio (CRR).
Geotechnical Lessons Learnt From Neftegorsk Earthquake, Mark A. Klyachko
Geotechnical Lessons Learnt From Neftegorsk Earthquake, Mark A. Klyachko
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Under Neftegorsk (North Sakhalin) earthquake (1:04 a.m. local time, 05.28.95) 17 residential large-block houses were fully collapsed and killed almost everybody of inhabitants. Most of investigators explain this tragedy by poor construction. Other cause related to soil condition is under consideration. The author argues that “soil version” is more reasonable and significant than “construction version”. Neftegorsk is located on the sand deposits and just inundated sands, which were in basement of the 5-story buildings and had a liquefaction ability, could provoke a rapid inhomogeneous buildings settlements under vertical earthquake component. Thus, the absence of forehanded geotechical analysis under new seismic …
Effective Stress Analysis Of Pile Foundations Showing Various Damage Patterns In Liquefied Deposits During 1995 Hyogoken-Nambu Earthquake, Masanobu Miyazaki, Sadayuki Ishizaki, Kohji Tokimatsu
Effective Stress Analysis Of Pile Foundations Showing Various Damage Patterns In Liquefied Deposits During 1995 Hyogoken-Nambu Earthquake, Masanobu Miyazaki, Sadayuki Ishizaki, Kohji Tokimatsu
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Effective stress analysis is conducted for six buildings that suffered various patterns of damage during soil liquefaction in the 1995 Hyogoken-Nambu earthquake, in order to examine major causes of the damage as well as the effectiveness of the analytical procedure. A comparison of the computed result with the filed observation indicates that the effective stress analysis is capable of discriminating damaged from undamaged foundations as well as of estimating the damage portion and severity with a reasonable degree of reliability. The analytical result also shows that: (1) the damage to pile heads is mainly due to the inertia force from …
Near Source Strong Ground Motion Simulation For Kocaeli Earthquake (1999), Abdullah Can Zulfikar, Hirokazu Takemiya
Near Source Strong Ground Motion Simulation For Kocaeli Earthquake (1999), Abdullah Can Zulfikar, Hirokazu Takemiya
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A near field strong ground motion simulation was carried out due to fault rupturing in the Kocaeli Earthquake (1999). The ground motions are simulated by the convolution scheme in time for source function and in space along rupture direction with the layered soil Green's function method based on the kinematic dislocation model. The effects of the asperities in the fault rupturing are focused considering inhomogeneous rupture mechanism in terms of a multiple asperities. The synthetic motions based on the inversion information from the observed data are compared well with the YPT (Yarimca Petrochemical Complex) record of the Kocaeli Earthquake. The …
Soil Liquefaction And Ground Settlement In Chi-Chi Taiwan, Earthquake, Der-Her Lee, Chih-Sheng Ku, C. Hsein Juang
Soil Liquefaction And Ground Settlement In Chi-Chi Taiwan, Earthquake, Der-Her Lee, Chih-Sheng Ku, C. Hsein Juang
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper presents an investigation of soil liquefaction and ground settlement in the 1999 Chi-Chi, Taiwan, earthquake. The quake killed more than 2400 people and caused a great destruction to buildings, bridges, dams, highways and railways. One of the causes for heavy damages to the structures is soil liquefaction and ground settlement during the earthquake. Six sites that were observed to experience liquefaction are investigated through cone penetration testing (CPT), and the liquefaction potential of each site and the settlement of the liquefied soil strata are analyzed.
Damage From Collapsed Backfill Rock And Soils Behind Retaining Walls Caused By Earthquake Shaking, Chester A. Carville
Damage From Collapsed Backfill Rock And Soils Behind Retaining Walls Caused By Earthquake Shaking, Chester A. Carville
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The 17 January 1994 Northridge Earthquake caused extensive damage to thousands of buildings and condominiums throughout the San Fernando Valley. Not only to the buildings’ structure, but also to the foundations and subdrain systems. This author investigated and documented hundreds of cases where condominium units experienced similar symptoms of damage resulting from collapsed backfill rock and soils from the earthquake forces. A typical condominium building investigated was of three story construction with an 8 to 10 foot high retaining wall on three sides of the 4 to 10 unit building to contain the garages and utility rooms. Some building slabs …
Development Of Supreme Super High-Density Realtime Disaster Mitigation System For Gas Supply System, Yoshihisa Shimizu, Kenichi Koganemaru, Wataru Nakayama, Fumio Yamazaki
Development Of Supreme Super High-Density Realtime Disaster Mitigation System For Gas Supply System, Yoshihisa Shimizu, Kenichi Koganemaru, Wataru Nakayama, Fumio Yamazaki
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
With the 3,700 New SI sensors installed throughout its service area (3,100 km2), Tokyo Gas has started to develop its super high-density real-time disaster mitigation system "SUPREME" for gas supply systems. Immediately after an earthquake, seismic data from the New SI sensors is relayed to the main system where extremely precise estimates of the damage are made on the spot. Damage estimation consists of making an estimate of the surface distribution of seismic motion that takes account of the site amplification factor, and making an estimate of damage to the pipeline network that takes account of factors such …
Seismic Microzonation Of Central Khartoum, Sudan, Yahia E.-A. Mohamedzein, Jamal A. Abdalla, Ahmed M. Elsharief, Abu Bakr Abdelwahab, Elfatih O. Ahmed
Seismic Microzonation Of Central Khartoum, Sudan, Yahia E.-A. Mohamedzein, Jamal A. Abdalla, Ahmed M. Elsharief, Abu Bakr Abdelwahab, Elfatih O. Ahmed
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A preliminary seismic microzonation of Central Khartoum, Sudan is proposed. Khartoum, the capital of Sudan, is located at the confluence of White and Blue Niles. The city is heavily populated. The Central Khartoum with its high rise buildings is the center of governmental and business activities and is located on strip adjacent to the Blue Nile. Geological and geotechnical data indicated that the subsoil conditions at Central Khartoum are characterized by alluvial deposits underlain by Nubian Sandstone below a depth of 20 m. The alluvial deposits locally known as Gezira formations, consist of clays grading into silt and sand with …
Recent Studies On Seismic Analysis And Design Of Retaining Structures, Susumu Iai
Recent Studies On Seismic Analysis And Design Of Retaining Structures, Susumu Iai
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The studies on seismic analysis and design of retaining walls in the recent years have revolved around the wall performance in the near-source zones. Major developments include: (1) the conventional limit equilibrium approach is extended based on the multiple failure plane concept; (2) a set of design charts for evaluating residual horizontal displacement of a gravity wall on yielding foundation are developed based on the parametric effective stress analysis; (3) applicability of the effective stress analysis on the retaining wall performance is confirmed by the case history during Hyogoken-Nambu, Kobe, earthquake; (4) major earthquake motion parameters that govern the wall …
Dam Engineering — Earthquake Analysis, Pedro Simão Sêco E Pinto
Dam Engineering — Earthquake Analysis, Pedro Simão Sêco E Pinto
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The performance of dams subjected to earthquakes is addressed with particular emphasis of recent earthquakes. Analysis of dams stability during earthquakes by experimental and mathematical models is referred. Foundation studies for soil and rock materials are described and assessment of liquefaction potential is discussed. Selection of design earthquakes by deterministic and probabilistic criteria is presented. Also neotectonics and attenuation relations are described. Monitoring and dam safety during construction and operation are addressed. Reservoir induced seismicity and prototype dynamic tests are treated. Ageing effects and rehabilitation of dams are discussed. Benefits and concerns of dams are referred. Risk analysis is addressed. …
Co-Sponsors, Shamsher Prakash
Co-Sponsors, Shamsher Prakash
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Conference Schedule, Shamsher Prakash
Conference Schedule, Shamsher Prakash
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Citation (Kenji Ishihara), Multiple Participants
Citation (Kenji Ishihara), Multiple Participants
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Spouses Program, Multiple Participants
Spouses Program, Multiple Participants
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.