Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Missouri University of Science and Technology

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 13951 - 13980 of 33681

Full-Text Articles in Entire DC Network

Selection Of Ground Motion Records For Two Dam Sites In Oregon, Kenji Yamasaki, Andy Vessely, Chris Carpenter May 2010

Selection Of Ground Motion Records For Two Dam Sites In Oregon, Kenji Yamasaki, Andy Vessely, Chris Carpenter

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

Internet-based USGS’s interactive deaggregation of probabilistic seismic hazard was used to identify principal sources of earthquake hazard at two dam sites in western Oregon. The dams are located in the western margin of the Pacific Northwest region of the United States where Cascadia Subduction Zone and shallow gridded crustal earthquakes are dominant sources of earthquake hazard. For each source, the magnitude, distance, and number of standard deviations (ε) were determined to develop target acceleration response spectra using ground motion prediction equations. The selection of ε for the gridded crustal earthquakes was different for the two sites; one site is in …

Go to article

A Study On The Seismic Response Of Ground And Reinforced Concrete Buildings In Belgaum Region, India, L. Govindaraju, C. A. Madhusudhan, S. S. Quadri May 2010

A Study On The Seismic Response Of Ground And Reinforced Concrete Buildings In Belgaum Region, India, L. Govindaraju, C. A. Madhusudhan, S. S. Quadri

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

In the recent years, each unpredictable earthquake (for example Kobe, 1995; Taiwan, 1999; Kocaeli, 1999 and Bhuj, 2001) has revealed its own saga of destruction and failure of engineered structures. Therefore, regional variation in potential earthquake damage should be carefully assessed for better planning towards disaster mitigation. This requires assessment of the seismic ground motion parameters. The present study focus on the seismic response of ground and reinforced concrete buildings in Belgaum region (located in zone III, as per IS 1893–Part1: 2002) in Karnataka state. At present no strong motion records are available in this region and therefore, wavelet-based spectrum …

Go to article

Effective Stress V/S Total Stress Ground Response Analyses For A Typical Site In Chennai (India), R. Uma Maheswari, A. Boominathan, G. R. Dodagoudar May 2010

Effective Stress V/S Total Stress Ground Response Analyses For A Typical Site In Chennai (India), R. Uma Maheswari, A. Boominathan, G. R. Dodagoudar

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

This paper presents the results of ground response analyses carried out for a typical sandy site in Chennai city by equivalent linear and nonlinear total and effective stress approaches. The soil profile at the site consists of 26m thick sandy layer with SPT blow count increases from 16 to above 50 with depth. The shear wave velocity profile measured using field Multichannel Analysis of Surface Wave (MASW) test is found to increase from 170 m/s to 400 m/s at 26m depth. The equivalent linear ground response analysis was carried out using SHAKE2000. The nonlinear total and effective stress analyses were …

Go to article

Prediction Of Liquefaction Potential For Kolkata Region By Semi-Empirical Method, P. Bhattacharya, S. P. Mukherjee, Biswajit Das May 2010

Prediction Of Liquefaction Potential For Kolkata Region By Semi-Empirical Method, P. Bhattacharya, S. P. Mukherjee, Biswajit Das

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

The present study was carried out to propose a relationship between shear wave velocity and N-value for the deltaic region of Kolkata. The relationship was derived from shear wave velocity determined from Cross-Hole test and SPT carried out at Rajarhat, Kolkata. The derived relationship was applied to evaluate the liquefaction susceptibility in terns of factor of safety against liquefaction for the subsoil deposits explored at Rajarhat, Kolkata area and the factor of safety obtained from the derived correlations was compared with those determined from Seed & Idriss (1971) and Andrus and Stokoe (2000). The shear wave velocity method (Andrus & …

Go to article

Parametric Investigation Of Lateral Spreading In Free-Face Ground Formations, Alexandros Valsamis, George Bouckovalas, Vasiliki Dimitriadi May 2010

Parametric Investigation Of Lateral Spreading In Free-Face Ground Formations, Alexandros Valsamis, George Bouckovalas, Vasiliki Dimitriadi

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

Liquefaction-induced lateral spreading can cause extensive damage and even failure to foundations and earthworks resting inside or in the vicinity of the affected ground. The current practice for the evaluation of the ground surface displacement due to lateral spreading, is to rely upon a number of published empirical relations which are based on statistical analysis of field measurements. As an alternative, aimed to overcome a number of objective limitations related to the interpretation of field data, this article employs a numerical investigation to explore the main parameters affecting the anticipated maximum ground surface displacement and to quantify their effect in …

Go to article

Seismotectonic Contours Of Kashmir-Hazara Region And Seismological Aspects Of October 08, 2005 Earthquake, Syed Kazim Mahdi May 2010

Seismotectonic Contours Of Kashmir-Hazara Region And Seismological Aspects Of October 08, 2005 Earthquake, Syed Kazim Mahdi

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

During the wee hours of October 08, 2005, a devastating shallow focused (16.2 km) earthquake with moment magnitude of Mw 7.7 occurred in the Pakistan’s Kashmir Hazara Region. Its tremors were felt in a radius of over 1000 km with damages taking place in an area of 36000 sq km. More than 0.1 million people died and the rehabilitation of infrastructures damages are estimated to cost around five billion dollars. The Kashmir Hazara terrain is located on the NW margin of lesser Himalaya. The KHS is one of the bold tectonic scars which physically isolate this terrain from rest of …

Go to article

Some Seismological Characteristics Of Mw 6.5 Pishin-Ziarat October 29, 2008 Double Earthquake, Syed Kazim Mahdi May 2010

Some Seismological Characteristics Of Mw 6.5 Pishin-Ziarat October 29, 2008 Double Earthquake, Syed Kazim Mahdi

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

On October 29, 2008 two shallow focused earthquakes of Mw 6.5 struck the Pishin-Ziarat districts of Baluchistan in Pakistan. Both seismic events took place between 12 hours of each other with Intensity X and have been termed as Double Earthquake. The Earthquakes are located approximately 50 km northeast of the region of most intense damage from the Pakistan earthquake of May 30, 1935 (Mw 7.8), which is estimated to have killed 35,000 people. Field observations in the earthquake affected areas were undertaken field observations along previously mapped seismically active Gogai, Bibai and Kawas Tangi faults and study Seismological Characteristics such …

Go to article

Spt-Based Evaluation Of Soil Liquefaction Risk, Francesco Castelli, Valentina Lentini May 2010

Spt-Based Evaluation Of Soil Liquefaction Risk, Francesco Castelli, Valentina Lentini

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

The city of Catania in Sicily (Italy) been destroyed in the past by the 1169 earthquake with XI MCS intensity, the 1693 earthquake with X MCS intensity and the 1818 earthquake with VIII MCS intensity. The standard approach for the evaluation of the liquefaction susceptibility is based on the estimation of a safety factor between the cyclic shear resistance to liquefaction and the earthquake induced shear stress. The liquefaction potential index has been evaluated in the area of the Catania port, near Saint Giuseppe La Rena, that experienced liquefaction because of the 1693 and 1818 earthquake. The site under study …

Go to article

Probabilistic Evaluation Of Field Liquefaction Potential Using Relative State Parameter Index (ΞR), Yaser Jafarian, Mohammad H. Baziar, Alireza Sadeghi, Rouzbeh Vakili May 2010

Probabilistic Evaluation Of Field Liquefaction Potential Using Relative State Parameter Index (ΞR), Yaser Jafarian, Mohammad H. Baziar, Alireza Sadeghi, Rouzbeh Vakili

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

From the earliest studies of soil behavior under cyclic loading, it is found that the cyclic stress required for liquefaction onset is strongly affected by the relative density (Dr ) and initial effective overburden pressure of the soil. In this paper, relative state parameter index (ξR), which accounts for both relative density and effective stress, is used to evaluate the likelihood of liquefaction initiation in field condition. Two comprehensive databases of field case histories based on SPT and CPT are incorporated in the analyses. Logistic regression method is employed to derive a probabilistic expression that yields the …

Go to article

Effect Of Uplift Modelling On The Seismic Response Of Shallow Foundations, Liam Wotherspoon, Michael Pender May 2010

Effect Of Uplift Modelling On The Seismic Response Of Shallow Foundations, Liam Wotherspoon, Michael Pender

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

This paper presents the development and response of a numerical model for the representation of uplift and reattachment of shallow foundations using the Ruaumoko non-linear dynamic analysis software. Vertical loads carried by the foundation were used to control the rotational and horizontal characteristics, as the stiffness of all degrees of freedom must reduce as the footing progressively detaches from the underlying soil. This culminates in the representation of total uplift, where the foundation provides no stiffness in any degree of freedom until vertical loads become compressive again. Through extension of the capabilities of Ruaumoko, this response was able to be …

Go to article

Dynamic Winkler Modulus For Axially Loaded End-Bearing Piles, George M. Anoyatis, George E. Mylonakis May 2010

Dynamic Winkler Modulus For Axially Loaded End-Bearing Piles, George M. Anoyatis, George E. Mylonakis

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

The problem of dynamic pile-soil interaction and its modeling through the concept of a Dynamic Winkler Foundation are revisited. It is shown that depth-dependent Winkler springs and dashpots, obtained by dividing the complex-valued soil shear tractions and the corresponding displacements along the pile, may faithfully describe pile-soil interaction, contrary to common perception that the Winkler model is always approximate. A theoretical wave model is then derived for analyzing the response of axially loaded endbearing piles embedded in a homogeneous viscoelastic soil medium. Closed-form solutions are obtained for: (i) the displacement field in the soil and along the pile; (ii) the …

Go to article

Earthquake Input Motions And Seismic Site Response In A Centrifuge Test Examining Sfsi Effects, Henry B. Mason, Jonathan D. Bray, Katherine C. Jones, Zhiqiang Chen, Tara C. Hutchinson, Nicholas W. Trombetta, Benjamin Y. Choy, Bruce L. Kutter, Gregg L. Fiegel, Jack Montgomery, Roshani J. Patel, Robert D. Reitherman, Chandrakanth Bolisetti, Andrew S. Whittaker May 2010

Earthquake Input Motions And Seismic Site Response In A Centrifuge Test Examining Sfsi Effects, Henry B. Mason, Jonathan D. Bray, Katherine C. Jones, Zhiqiang Chen, Tara C. Hutchinson, Nicholas W. Trombetta, Benjamin Y. Choy, Bruce L. Kutter, Gregg L. Fiegel, Jack Montgomery, Roshani J. Patel, Robert D. Reitherman, Chandrakanth Bolisetti, Andrew S. Whittaker

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

This paper describes the ground motion selection process and reports observed seismic site response and SFSI effects during a dynamic centrifuge test (Test-1). The centrifuge test is the first in a series of tests examining the effects of SFSI in dense urban environments. The objective of Test-1 is to examine SFSI effects for two structures that are located a significant distance apart and essentially isolated. The model structures represent a three-story building founded on spread footings and a nine-story structure founded on a threestory basement. The structures are sited on a dry, dense bed of Nevada Sand. The centrifuge model …

Go to article

Designing Optimization For Some Eolian Power Unit Taking Into Account The Seismic Loads Influence, Dragos Vintila, Diana Tenea, Anton Chirica May 2010

Designing Optimization For Some Eolian Power Unit Taking Into Account The Seismic Loads Influence, Dragos Vintila, Diana Tenea, Anton Chirica

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

In the eastern part of the Romanian territory there are wind intensity conditions for some big eolian power units. From lithological point of view, the mentioned area is characterized by a loessial stratum of 3 up to over 20m deep which covers green shale rocks. The paper presents the designing consideration discussed in order to obtain the most economical foundation option. The corresponding calculus conclusions about the soil-structure interactions in seismic conditions are also revealed.

Go to article

Assessment Of Liquefaction-Induced Foundation Soil Deformations, K. Onder Cetin, Berna Unutmaz, H. Tolga Bilge May 2010

Assessment Of Liquefaction-Induced Foundation Soil Deformations, K. Onder Cetin, Berna Unutmaz, H. Tolga Bilge

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

Although there exist some consensus regarding seismic soil liquefaction triggering assessment of free field soil sites, estimating the liquefaction triggering potential beneath building foundations still stays as a controversial and a difficult issue. Assessing liquefaction triggering potential under building foundations requires the estimation of cyclic and static stress state of the soil medium. In the recent studies (e.g. Unutmaz 2008), the cyclic stress ratio corrected for Kα and Kσ effects under and adjacent to building foundations subjected to cyclic loading are to be estimated with the help of a series of 2-D and 3-D numerical simulations for different …

Go to article

Assessment Of Liquefaction Susceptibility Of Geological Units In The Area Of Gulf Of Corinth, Greece, George Papathanassiou, Sotiris Valkaniotis, Spyros Pavlides May 2010

Assessment Of Liquefaction Susceptibility Of Geological Units In The Area Of Gulf Of Corinth, Greece, George Papathanassiou, Sotiris Valkaniotis, Spyros Pavlides

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

The coastal area of Gulf of Corinth is characterized as medium to high seismicity zone since devastating earthquakes occurred during a 2500 years period. One of the most characteristic events is the 373 B.C. Eliki earthquake that triggered severe secondary effects including soil liquefaction and large scale landslides. The basic aim of this paper is the compilation of a map regarding the liquefaction susceptibility in the coastal area of Gulf of Corinth, Central Greece. In order to achieve this, we used data regarding the age and depositional process of sediments the value of peak ground acceleration (PGA) and the occurrence …

Go to article

Case Histories Of Widespread Liquefaction And Lateral Spread Induced By The 2007 Pisco, Peru Earthquake, Jorge F. Meneses, J. Alva, B. Cox, V. Moreno, M. Olcese, R. Sancio, J. Wartman May 2010

Case Histories Of Widespread Liquefaction And Lateral Spread Induced By The 2007 Pisco, Peru Earthquake, Jorge F. Meneses, J. Alva, B. Cox, V. Moreno, M. Olcese, R. Sancio, J. Wartman

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

Case histories of widespread liquefaction and lateral spread induced by the Mw 8.0, 2007 Pisco, Peru earthquake and observed during a post-earthquake GEER reconnaissance are presented. A long duration of the earthquake over 200 seconds and two phases of strong ground motion induced widespread liquefaction and lateral spread of sand coastal deposits and road embankments over a total length of approximately 100 km of coastal region. Six case histories of liquefaction are presented and discussed including a massive lateral spread of a marine terrace believed to be as large or even larger than that reported along the Shinano River …

Go to article

Cpt-Based Comparative Mapping Of Liquefaction Hazard For Large Areas, Johann Facciorusso, Marco Uzielli, Giovanni Vannucchi May 2010

Cpt-Based Comparative Mapping Of Liquefaction Hazard For Large Areas, Johann Facciorusso, Marco Uzielli, Giovanni Vannucchi

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

Liquefaction hazard mapping provides a useful tool for risk mitigation planning in seismic areas. Mapping for large areas is usually pursued by applying simplified criteria which rely on geological/lithological data and/or index properties of investigated soils, and in which local seismicity is not adequately considered (grade-1 methods). When a large number of in situ-tests and a reliable seismic hazard analysis are available, liquefaction hazard can be investigated by applying in-situ test-based methods accounting for seismic loading and the susceptibility of in-situ soil volumes (grade-2 methods). Advances in geotechnical earthquake engineering currently allow both deterministic and probabilistic evaluation of liquefaction potential …

Go to article

Dem Simulation Of Liquefaction-Induced Lateral Spreading, Usama El Shamy, Mourad Zeghal, Ricardo Dobry, Tarek Abdoun, Sabanayagam Thevanayagam, Ahmed Elgamal May 2010

Dem Simulation Of Liquefaction-Induced Lateral Spreading, Usama El Shamy, Mourad Zeghal, Ricardo Dobry, Tarek Abdoun, Sabanayagam Thevanayagam, Ahmed Elgamal

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

This paper reports the results of a model-based simulation of 1g shake table tests of sloping saturated granular deposits subjected to seismic excitations. The simulation technique utilizes a transient fully-coupled continuum fluid discrete particle model of the watersaturated soil. The fluid (water) phase is idealized at a macroscale using an Eulerian averaged form of Navier-Stokes equations. The solid particles are modeled at the microscale as an assemblage of discrete spheres using the discrete element method. The interphase momentum transfer is accounted for using an established relationship. Numerical simulations were conducted to investigate the liquefaction induced lateral spreading of a mild-sloped …

Go to article

Prediction Of Lateral Displacement Of Liquefaction Induced Ground Using Extreme Learning, Sarat Kumar Das May 2010

Prediction Of Lateral Displacement Of Liquefaction Induced Ground Using Extreme Learning, Sarat Kumar Das

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

Though various mechanistic based models are there for prediction of lateral displacement of ground, the statistical/ empirical methods based on the insitu data is most widely used. The artificial neural network method has been extensively used an alternate statistical method in different complex geotechnical engineering problems. Due to inherent difficulty of generalization in artificial neural network method, support vector machine, which is based on statistical learning algorithm is also being used. This paper describes use of extreme learning machine for prediction of large lateral displacement of liquefaction induced ground during an earthquake. Extreme learning machine is an artificial intelligence techniques …

Go to article

Seismic Analysis Of Saturated Sand Deposits With Silt Layers, Murat Tonaroglu, Kutay Ozaydın, S. Umit Dikmen May 2010

Seismic Analysis Of Saturated Sand Deposits With Silt Layers, Murat Tonaroglu, Kutay Ozaydın, S. Umit Dikmen

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

Liquefaction of saturated sands during earthquakes is known to be the cause of significant earthquake related damages, including loss of bearing capacity, lateral flow and spreading, slope failures. In recent earthquakes including the1999 Marmara Earthquake in Turkey, field observations have indicated that silt inclusions or silt layers in the sandy deposits can have significant effects on development of liquefaction. The objective of this work is to analytically study the behavior of saturated sand deposits with silt layers. For this purpose, a hypothetical soil profile in which silt layers exist has been selected. The selected profile was then modeled and analyzed …

Go to article

3d Analysis Of The Seismic Response Of Seven Oaks Dam, Lelio Mejia, Ethan Dawson May 2010

3d Analysis Of The Seismic Response Of Seven Oaks Dam, Lelio Mejia, Ethan Dawson

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

Procedures for the three-dimensional (3-D) dynamic analysis of earth dams have been available for over 25 years. However, additional case histories are needed to assess whether such procedures are capable of simulating the seismic response of dams in narrow canyons, and to further evaluate the effects of 3-D behavior on the response of such dams. This study was aimed at identifying the vibration characteristics of Seven Oaks Dam during the 2005 Yucaipa and 2001 Big Bear Lake earthquakes, and at evaluating the applicability of 3-D and 2-D numerical procedures to simulate the response of the dam. Accelerograms recorded on the …

Go to article

A Probabilistic Method For The Prediction Of Earthquake-Induced Slope Displacements, Simone Barani, Paolo Bazzurro, Fabrizio Pelli May 2010

A Probabilistic Method For The Prediction Of Earthquake-Induced Slope Displacements, Simone Barani, Paolo Bazzurro, Fabrizio Pelli

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

This work presents a probabilistic method for estimating earthquake-induced nonlinear slope displacements. This method is applicable to any kind of slope, embankment and earth/rockfill dam. When coupled with Probabilistic Seismic Hazard Analysis at the slope site, it produces estimates of the annual probability that a permanent deformation of the slope will be exceeded. The proposed method uses a set of 2D numerical analyses with non-linear constitutive relationships for the soil formations to establish a probabilistic relationship between one or more ground motion parameters and the permanent displacement at a specific location within the slope. The analyses, which are performed using …

Go to article

2d Fem Analysis Of Earth And Rockfill Dams Under Seismic Condition, Prabir K. Basudhar, N.S.V. Kameswara Rao, M. Bhookya, Arindam Dey May 2010

2d Fem Analysis Of Earth And Rockfill Dams Under Seismic Condition, Prabir K. Basudhar, N.S.V. Kameswara Rao, M. Bhookya, Arindam Dey

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

The paper pertains to the seismic analysis of earth and rockfill dams with the aid of MSC_ Nastran (Windows) package. After validation, the package has been used to investigate the dynamic response of Tehri Dam, located in the seismically active region of Himalayas. A 2D FEM analysis is adopted wherein the dam has been modeled as a linear, elastic, non-homogeneous material. The base acceleration data of the Bhuj Earthquake has been used as an input motion. Effect of Poisson’s ratio and the ratio of the canyon length to the height of the dam has been investigated and is reported. Acceleration-time …

Go to article

Static Load Induced Liquefaction, Steels Corners Road Embankment Failure, Mitchell W. Weber, Alexandre J. Bredikhin May 2010

Static Load Induced Liquefaction, Steels Corners Road Embankment Failure, Mitchell W. Weber, Alexandre J. Bredikhin

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

A simple, roadway widening became significantly more expensive when geologic conditions conspired to complicate the project. The widening was to be accomplished by the construction of a 25-foot wide and 15-foot high embankment. The embankment was located adjacent to a “wetland” area and pond. Fill placement begin and a height of 7 feet was reached when operations ceased for the week. Work began two days later. A 400-foot long scarp formed and the fill “moved” nearly 4 feet vertically and 1-foot laterally. An initial suspicion of settlement due to compression of peat was dismissed when no organic deposits were found …

Go to article

Soft Soil Effect On Soft Storey Response, Tahmeed M. Al-Hussaini, Kamruzzaman Khan May 2010

Soft Soil Effect On Soft Storey Response, Tahmeed M. Al-Hussaini, Kamruzzaman Khan

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

Multi-storied reinforced concrete frame (RCF) buildings with open first storey to provide parking space is common in Dhaka city, the capital of Bangladesh. Such buildings are likely to produce soft storey action when subjected to earthquake loadings. Bangladesh building code places Dhaka in a moderate earthquake zone with a zone coefficient (Z) value of 0.15. Several soft soil sites exist in the city, most of which have been created by filling up of low lands and water bodies without proper compaction. Such soft soil sites are likely to produce major site amplification effects during earthquakes. One-dimensional wave propagation using the …

Go to article

A Review Of Seismic Lrfd (Load-And-Resistance Factor Design) Method For Mse (Mechanically Stabilized Earth) Walls, Fransiscus S. Hardianto, Kim M. Truong, John E. Sankey May 2010

A Review Of Seismic Lrfd (Load-And-Resistance Factor Design) Method For Mse (Mechanically Stabilized Earth) Walls, Fransiscus S. Hardianto, Kim M. Truong, John E. Sankey

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

The introduction of AASHTO’s LRFD (load-and-resistance factor design) method for the design of MSE (mechanically stabilized earth) walls in 2004 has gradually replaced conventional state-of-the-practice seismic ASD (allowable stress design) method in some states, and by FHWA mandate should completely replace the ASD method by 2010. Limit equilibrium analyses based on Mononabe- Okabe (M-O) pseudo-static method had been the standard method of estimating the seismic external thrust and inertia force for MSE walls. Considering the flexible nature of MSE walls that allow deformation without compromising structural integrity, in the LRFD method, the displacement based pseudo-static method that was developed from …

Go to article

Discussions On Dynamic Interaction Between Piles And Large Particle Rockfill, Yohsuke Kawamata, Scott A. Ashford May 2010

Discussions On Dynamic Interaction Between Piles And Large Particle Rockfill, Yohsuke Kawamata, Scott A. Ashford

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

A series of full-scale laterally loaded pile tests were conducted at the University of California, San Diego in 2007 in order to obtain a better understanding about pile-rockfill interaction for seismic design of port facilities. The project was composed of three experiments where the cyclic lateral loads were cyclically applied at the heads of the piles fully instrumented using a hydraulic actuator. Comparing the experimental and numerical results, assessments of p-y curves used for current design practice were performed. As a result, it was found that the soil pile springs currently used for design gave much lower lateral resistance than …

Go to article

Diaphragm Walls Seismic Design According To The Eurocodes, José Matos E Silva May 2010

Diaphragm Walls Seismic Design According To The Eurocodes, José Matos E Silva

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

Although one can think that it is very low the probability of a seism occurrence during the execution of an excavation in an urban lot protected by a diaphragm wall curtain, reality shows that whenever a seism occurs in an urban area several diaphragm walls will be affected by it. So it is advisable to consider the seismic action when designing a diaphragm wall curtain. The Eurocodes consider the seismic actions in Eurocode 8 (EC 8) and recommend the use of the Mononobe-Okabe method when dealing with soil retaining structures. The Eurocodes consider the possibility of each European country to …

Go to article

Effect Of Elastic And Inelastic Dssi On Seismic Demands Of Sdofs Structures, Esteban Sáez, Fernando López-Caballero, Arézou Modaressi-Farahmand-Razavi May 2010

Effect Of Elastic And Inelastic Dssi On Seismic Demands Of Sdofs Structures, Esteban Sáez, Fernando López-Caballero, Arézou Modaressi-Farahmand-Razavi

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

In general, under earthquake loading, the soil reaches the limit of its elastic behavior before the structural elements. Thus, an earthquake analysis approach assuming inelastic structural behavior under fixed base condition or with elastic dynamic soil-structure interaction (DSSI) hypothesis may be inadapted. This paper describes the investigation conducted in order to define the contribution of the pure elastic DSSI effects in the complete inelastic DSSI problem. With this purpose, a comparative analysis between elastic and inelastic soil behavior assumptions for two inelastic single-degree-of-freedom (SDOF) structures and two soils is carried out. The results point out that, in general, inelastic soil …

Go to article

Evaluation Of Deformation Behavior Of Quay Walls Under Earthquake Loading, Masoomeh Khodabakhshi, Mohammad Hassan Baziar May 2010

Evaluation Of Deformation Behavior Of Quay Walls Under Earthquake Loading, Masoomeh Khodabakhshi, Mohammad Hassan Baziar

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

Ports are often regional economic centers and important components of regional and local transportation lifeline systems. Because of these reasons, the downtime of the ports due to natural disaster such as an earthquake results in severe economic loss. Gravity quay walls are the most common type of construction for docks because of their durability, ease of construction and capacity to reach deep seabed levels. Past earthquakes demonstrated that the seismic behavior of port structures such as quay walls was significantly governed by the properties of soils. The 1995 Hyogoken- Nanbu (Kobe) Earthquake brought great damage to structures in the Port …

Go to article

First Prev Next Last