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Articles 121 - 150 of 432
Full-Text Articles in Geotechnical Engineering
Stability Analysis Of Flood Protection Embankments And Riverbank Protection Works, Rajib Kumar Goswami, Baleshwar Singh
Stability Analysis Of Flood Protection Embankments And Riverbank Protection Works, Rajib Kumar Goswami, Baleshwar Singh
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Frequent and widespread flooding is a major problem in Assam, which is a north-eastern state of India. The problem is caused mainly by the Brahmaputra river whose erratic riverbank erosion has been leading to general widening of channels and large-scale instability of banks. In the last century, the river has widened by more than 50% in several stretches causing serious threat to nearby urban centres apart from eroding several thousand hectares of fertile agricultural land including tea gardens. As of now, the width between outer banks ranges from as low as 1.2 km at some sections to as high as …
Stability Assessment And Suggestion For Control Measures Of A Potential Landslide Slope On Nh 94, Uttarakhand Himalaya, India, A. Ghosh, S. Sarkar, D. P. Kanungo, P. K. S. Chauhan, Zamir Ahmad
Stability Assessment And Suggestion For Control Measures Of A Potential Landslide Slope On Nh 94, Uttarakhand Himalaya, India, A. Ghosh, S. Sarkar, D. P. Kanungo, P. K. S. Chauhan, Zamir Ahmad
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
An unstable slope having few houses which were under distress was studied to arrive at suitable control measures. The slope has undergone subsidence at the road level and there are few houses down the road level which have developed major cracks. The study was focused on identification of causes, assessment of slope stability and suggestions for control measures. The study involved geological and geotechnical investigations, slope stability analysis and monitoring of movements. The paper highlights the field observations and results of the study.
Static And Dynamic Behavior Of Earthen Slopes In The Region Of Uttarkashi, India, Govardhan Bhat, Navjeev Saxena, S. K. Prasad
Static And Dynamic Behavior Of Earthen Slopes In The Region Of Uttarkashi, India, Govardhan Bhat, Navjeev Saxena, S. K. Prasad
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Earthen slopes experience considerable degradation in strength and stiffness during seismic activities. Past earthquakes have revealed the development of landslide and permanent movement of earth mass towards downstream. In this paper, a finite element analysis using GEOSLOPE on earthen slopes under static and dynamic loading due to earthquake has been carried out. The earthen slope is idealized as a plane strain two-dimensional model and base acceleration in the form of typical earthquake motion is represented as external loading. The performance of the slope including the stresses and displacements are analyzed. Further, the focus is on the determination of permanent displacement …
The Effect Of Geometry Changes On Sliding-Block Predictions, Constantine A. Stamatopoulos, Constantine Mavromihalis, Sarada Sarma
The Effect Of Geometry Changes On Sliding-Block Predictions, Constantine A. Stamatopoulos, Constantine Mavromihalis, Sarada Sarma
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The sliding-block model is often used for the prediction of permanent co-seismic displacements of slopes and earth structures. This model assumes motion in an inclined plane but does not consider the decrease in inclination of the sliding soil mass as a result of its downward motion, which is the usual state in the field. The paper studies the above effect and proposes an empirical equation correcting the predictions of the sliding-block model. The investigation is performed using the recently-developed multi-block model.
The Stability And Deformation Limit State Corresponding To The High Road Embankments Close To A Bridge, Anton Chirica, Dragos Vintila, Diana Tenea
The Stability And Deformation Limit State Corresponding To The High Road Embankments Close To A Bridge, Anton Chirica, Dragos Vintila, Diana Tenea
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The paper presents the analysis of a road embankment with variable height (between 4-10m) placed at Iassy, Romania, in the first year of service. It’s about access ledge at a bridge with total length of about 300m. At this time the embankment presents longitudinal cracks parallel with road axle, lateral knobs corresponding to each compacted layer, infiltrations through the backfill from the top (faulty pluvial system) and from the bottom (flooded foundation soil without drainage system). Foundation soil is a metastable clay. Triaxial tests type CKoD on stress loading paths have shown that this soil is sensitive to moistening at …
Using Recorded Earthquake Signals For Dynamic Analysis Of Masjed Soleiman Embankment Dam, M. Amel Sakhi, M. Jafari Davoodi
Using Recorded Earthquake Signals For Dynamic Analysis Of Masjed Soleiman Embankment Dam, M. Amel Sakhi, M. Jafari Davoodi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
There is a worldwide interest in the proper seismic design of embankment dams in high seismic hazard zones. The seismic behavior of embankment dams can be evaluated by in-situ dynamic tests (such as processing recorded earthquake signals on dam body), experimental methods (i.e. experiments using large shaking table, centrifuge tests) and numerical methods Using recorded earthquake signals on dam body is a powerful tool for researchers for dynamic analysis of embankment dams. In this research, recorded accelerograms are used to dynamic analysis of Masjed Soleiman embankment dam, the highest rockfill dam in Iran. Using recorded earthquake signals in the basement …
An Analytical Solution For Pile-Soil-Pile Interaction With Unequal Embedded Lengths Under Vertical Harmonic Vibrations, Mahmoud Ghazavi, Pedram Ravanshenas
An Analytical Solution For Pile-Soil-Pile Interaction With Unequal Embedded Lengths Under Vertical Harmonic Vibrations, Mahmoud Ghazavi, Pedram Ravanshenas
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Piles are normally constructed in groups such that they are located in the vicinity of each other. As a result, the response of piles is different from that of an isolated pile. In this paper, the interaction between two piles with unequal lengths in the group is investigated using an analytical solution. The elastic theory model and dynamic winkler model are use to characterise vertical isolated prismatic piles subjected to vertical harmonic vibrations. The results obtained for pile-soil-pile interaction from this solution account for unequal lengths for the two piles. In addition, it has been found that upon loading the …
Analysis Of Soil Nailed Walls Under Harmonic Dynamic Excitations Using Finite Difference Method, Alimohammad Sheikhbahaei, Amir M. Halabian, S. Hamid Hashemolhosseini
Analysis Of Soil Nailed Walls Under Harmonic Dynamic Excitations Using Finite Difference Method, Alimohammad Sheikhbahaei, Amir M. Halabian, S. Hamid Hashemolhosseini
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Soil nailing is an efficient method to stabilize different soil structures. The method has been extensively used for improving stability of slopes. The construction process of Soil nailed walls commonly involve three basic sections: excavation, nail installation and face stabilization. The nail bars are inserted into ground by either drilling or grouting and are usually arranged in both horizontal and vertical directions. Present research intends to understand Soil-nailed wall behavior under dynamic excitations. Employing finite difference method a three dimensional model has been developed in the proper finite difference code. Soil constitutive behavior for dynamic analyses is predicted taking into …
Analysis Of Tunnel Behaviour Under Seismic Loads By Means Of Simple And Advanced Numerical Approaches, Daniela Boldini, Angelo Amorosi, Fabrizio Palmisano
Analysis Of Tunnel Behaviour Under Seismic Loads By Means Of Simple And Advanced Numerical Approaches, Daniela Boldini, Angelo Amorosi, Fabrizio Palmisano
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In this paper different approaches aimed at investigating the dynamic behaviour of circular tunnels in the transverse direction are presented. The analysed cases refer to a shallow tunnel built in an ideal soft clayey deposit. The adopted approaches include one-dimensional (1D) numerical analyses performed modelling the soil as a single phase visco-elastic non-linear medium, the results of which are then used to evaluate the input data for selected analytical solutions proposed in the literature (uncoupled approach), and 2D fully coupled Finite Element simulations adopting visco-elastic and visco-elasto-plastic constitutive assumptions for the soil and the lining (coupled approach). The results are …
Effect Of Elastic And Inelastic Dssi On Seismic Demands Of Sdofs Structures, Esteban Sáez, Fernando López-Caballero, Arézou Modaressi-Farahmand-Razavi
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 …
Effect Of Liquefaction On Pile Shaft Friction Capacity, M. E. Stringer, S. P. G. Madabhushi
Effect Of Liquefaction On Pile Shaft Friction Capacity, M. E. Stringer, S. P. G. Madabhushi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Piled foundations are commonly used worldwide, and observed failures of these foundations during earthquakes has led to active research in this area. However, the way in which piles support axial loads during earthquakes is still not fully understood. In this paper, the results from centrifuge tests are presented which consider how axial loads are carried by piles during earthquake loading. It will be shown that the piles in dry soils mobilise additional shaft friction to carry the seismically induced axial loading. However, in the case of a pile group passing through a liquefiable soil layer and founded in a dense …
Evaluation Of Deformation Behavior Of Quay Walls Under Earthquake Loading, Masoomeh Khodabakhshi, Mohammad Hassan Baziar
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 …
Experimental Study On The Performance Of Reinforced Sand Beds Under Repeated Loads In Presence Of Water, S. Vijaya, S. Gangadhara
Experimental Study On The Performance Of Reinforced Sand Beds Under Repeated Loads In Presence Of Water, S. Vijaya, S. Gangadhara
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The performance and behavior of reinforced soil structure, both in the field and the laboratory are well documented. In the field situation, when the reinforced sand beds are used as a construction tool or as a ground improvement method, it is often the situation that they are subjected to the effect of water. In this study series of repeated load tests were conducted on mild steel square footing of 100mm size resting on a sand bed placed in a 500mm-dia, 390mm deep mild steel tank. Reinforcement location and spacing were selected based on optimization of previous research results. The sand …
Fem Modelling Of A 3d Soil-Pile System Under Earthquakes, Francesco Grassi, Maria Rossella Massimino
Fem Modelling Of A 3d Soil-Pile System Under Earthquakes, Francesco Grassi, Maria Rossella Massimino
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
During earthquakes seismic wave crossing through soft soil can lead to significant curvatures on pile foundations, which in turn lead to significant bending moments. These bending moments are commonly named “kinematic bending moments”, to be distinguished from the “inertial bending moments” due to horizontal forces transferred from superstructures to pile heads. Approaches to carefully evaluate inertial bending moments have been recently developed world-wide; but the evaluation of the kinematic bending moments is still questionable. In this paper a 3D soil-pile FEM system is analysed. The system is subjected to seismic input motions, applied at the base of the system, which …
Fixity Of Piles In Liquefiable Soils, Domenico Lombardi, Maria Giovanna Durante, Suresh R. Dash, Subhamoy Bhattacharya
Fixity Of Piles In Liquefiable Soils, Domenico Lombardi, Maria Giovanna Durante, Suresh R. Dash, Subhamoy Bhattacharya
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Recent researches have shown that piles are laterally unsupported in liquefiable soils during most strong earthquakes. If this unsupported length is significantly large, the high axial load on piles may make them more vulnerable to buckling instability. Calculation of buckling instability requires the full unsupported length of pile, which is the sum of pile length above the ground, pile length in the liquefied soil and a depth of fixity below the liquefied soil layer. In this paper, the length of fixity of pile foundations embedded in liquefiable soils has been investigated using a simple numerical method. The finite element program …
Influence Of Concentrated Mass On Pile Response Under Vertical Earthquake Excitation, Mahmoud Ghazavi, Amid Madhoushi
Influence Of Concentrated Mass On Pile Response Under Vertical Earthquake Excitation, Mahmoud Ghazavi, Amid Madhoushi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper presents an analytical solution to determine the kinematic and inertial response of a vertical pile embedded in a soil layer and subjected to vertical seismic excitation due to earthquake loading. The pile is assumed to have a circular cross section and perfectly connected to the soil. Also the soil stratum is assumed to be homogenous. The approach of Novak and his associates is used to derive the governing differential equation of the pile subjected to vertical harmonic vibrations. The kinematic response of the pile is first obtained considering stress free condition at the pile head and the ground …
Influence Of Soil Nonlinearities On Dynamic Soil-Structure Interaction, Ali Gandomzadeh, Luca Lenti, Maria Paola Santisi D’Avila, Fabian Bonilla, Jean-François Semblat
Influence Of Soil Nonlinearities On Dynamic Soil-Structure Interaction, Ali Gandomzadeh, Luca Lenti, Maria Paola Santisi D’Avila, Fabian Bonilla, Jean-François Semblat
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
For moderate or strong seismic events, the maximum strains can easily reach the elastic limit of the soil behavior. Considering soilstructure interaction, the nonlinear effects may change the soil stiffness at the base of the structure and the energy dissipation into the soil. To take into account the nonlinearity of the soil in the dynamic soil-structure interaction (DSSI), a 3D constitutive model, proposed by Iwan, is used to investigate DSSI in the framework of the Finite Element Method. The model accounts for the nonlinear hysteretic behavior of soils and only needs the shear modulus degradation curve to characterize the soil …
Lateral Response Of Bridge Pile Groups In Liquefiable Soil With Surface Non-Liquefiable Layer Using Shaking Table Test, Tang Liang, Ling Xianzhang, Xu Pengju, Gao Xia
Lateral Response Of Bridge Pile Groups In Liquefiable Soil With Surface Non-Liquefiable Layer Using Shaking Table Test, Tang Liang, Ling Xianzhang, Xu Pengju, Gao Xia
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper conducts a shaking table test study on seismic response of low-cap pile groups and bridge structure in liquefiable ground. The soil profile in the test consisted of the horizontal saturated sand layer overlaid the silty clay layer. The base was excited by three different El Centro earthquake events. The preliminary liquefaction characteristics of ground firstly were analyzed. The bending moment of the pile was mainly introduce in the note. There’s no doubt that the shaking table test provided the necessary groundwork to study lateral response of bridge pile groups in liquefiable soil with surface non-liquefiable layer.
Modeling The Influence Of Soil Structure Interaction On The Seismic Response Of A 5 Mw Wind Turbine, Ian Prowell, Ahmed Elgamal, Jinchi Lu
Modeling The Influence Of Soil Structure Interaction On The Seismic Response Of A 5 Mw Wind Turbine, Ian Prowell, Ahmed Elgamal, Jinchi Lu
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In order to capture more energy, wind turbines are rapidly growing in height and rotor size. This growth increases the likelihood that soil structure interaction effects may influence the structural dynamic response. Current 3 MW turbines tower over the landscape with an 80 meter hub height and a 90 meter rotor diameter. This paper models a full soil structure system for the National Renewable Energy Laboratory onshore 5 MW reference wind turbine with a hub height of 90 meter and a 126 meter rotor diameter. A detailed finite element model of the turbine is created, including a full three dimensional …
Non-Stationary Soil-Structure Interaction Analysis Of A Sdof System Subjected To Joint Horizontal And Vertical Seismic Excitations, Pranesh Chatterjee, Biswajit Basu
Non-Stationary Soil-Structure Interaction Analysis Of A Sdof System Subjected To Joint Horizontal And Vertical Seismic Excitations, Pranesh Chatterjee, Biswajit Basu
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In this paper a formulation has been presented to obtain the non-stationary response of a single degree of freedom system resting on a single layered soil medium and subjected to simultaneous horizontal and vertical seismic excitations. The wavelet based analytical technique using the modified Littlewood-Paley function has been adopted to characterize the seismic ground motions. Subsequently, the system equations have been solved in wavelet domain and closed form solutions for the response of the structure have been derived. The response has been calculated using wavelet based formulation and the traditional complex valued transfer function. A numerical example is also presented …
Numerical Modeling Of Soil-Pile Interaction In Liquefying Soils For A Water Crossing Bridge, Endi Zhai
Numerical Modeling Of Soil-Pile Interaction In Liquefying Soils For A Water Crossing Bridge, Endi Zhai
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A recent design of a water crossing bridge encountered potential liquefiable soils beyond the depth that our standard-of-practice simplified liquefaction evaluation method (NCEER, 1997, Youd et al., 2001) can apply. A field investigation including deep soil borings and cone penetration test soundings was performed and revealed that loose to medium dense sandy alluvial soils are about 80 feet thick below the mud line. To evaluate liquefaction susceptibility of deeply buried soils and liquefaction effect on the response of the abutment Cast-In-Steel-Shell (CISS) piles, nonlinear effective-stress numerical models were built that were fullycoupled with a pore pressure generation scheme. The excess …
Seismic Performance Assessment In Dense Urban Environments: Evaluation Of Nonlinear Building-Foundation Systems Using Centrifuge Tests, Zhiqiang Chen, Tara C. Hutchinson, Nicholas W. Trombetta, Henry B. Mason, Jonathan D. Bray, Katherine C. Jones, Chandrakanth Bolisetti, Andrew S. Whittaker, Benjamin Y. Choy, Bruce L. Kutter, Gregg L. Fiegel, Jack Montgomery, Roshani J. Patel, Robert D. Reitherman
Seismic Performance Assessment In Dense Urban Environments: Evaluation Of Nonlinear Building-Foundation Systems Using Centrifuge Tests, Zhiqiang Chen, Tara C. Hutchinson, Nicholas W. Trombetta, Henry B. Mason, Jonathan D. Bray, Katherine C. Jones, Chandrakanth Bolisetti, Andrew S. Whittaker, Benjamin Y. Choy, Bruce L. Kutter, Gregg L. Fiegel, Jack Montgomery, Roshani J. Patel, Robert D. Reitherman
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In dense urban areas, buildings are generally constructed in clusters, forming city blocks. New buildings are designed assuming their response is independent of adjacent buildings, which ignores potentially important structure-soil-structure-interaction (SSSI) effects. Although a few studies have revealed the significance of SSSI effects, validated simulation and design tools do not exist. In this paper, we present the results from the first in a series of centrifuge tests intended to investigate SSSI effects. Results herein are focused on the design and measured response of two model building-foundation systems placed on dense dry Nevada sand and tested at 55-g. The two models …
Seismic Performance Of Double Eps Geofoam Buffer Systems, Aurelian C. Trandafir, Steven F. Bartlett
Seismic Performance Of Double Eps Geofoam Buffer Systems, Aurelian C. Trandafir, Steven F. Bartlett
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper presents the results of a dynamic finite-element analysis addressing the effectiveness of a double expanded polystyrene (EPS) geofoam buffer system in reducing the peak seismic loads on a rigid, non-yielding retaining wall during an earthquake. A double EPS geofoam buffer system involves two vertical EPS panels, i.e., one EPS panel placed against the rigid wall face and another EPS panel installed at a specific distance away from the first panel in the backfill soil. Sensitivity analyses of the seismic performance of the double EPS geofoam buffer system in relation to the spacing between the EPS panels indicate that …
Seismic Performance Of Soil-Mix Panel Reinforced Ground, C. Guney Olgun, James R. Martin Ii
Seismic Performance Of Soil-Mix Panel Reinforced Ground, C. Guney Olgun, James R. Martin Ii
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Ground reinforcement methods such as stone columns, jet grouting, and soil mixing are commonly used to improve subsoil conditions for seismic mitigation. In most cases, the purpose of this improvement is for foundation support and/or liquefaction mitigation. Additional benefits of the improvement, such as possible reduction in seismic ground motions, are not explicitly considered in NEHRP/IBC code provisions for establishing site classification and seismic design motions. Such reductions, if present, can have significant payoff. Reduced seismic loads on the super structure result in lower seismic design levels and reduced construction costs. It is conceivable that the cost of ground improvement, …
Stiffness Coefficient In The Transition Zone Between Ballasted And Ballastless Track And Its Influence On Formation Stressing, Konstantinos Giannakos
Stiffness Coefficient In The Transition Zone Between Ballasted And Ballastless Track And Its Influence On Formation Stressing, Konstantinos Giannakos
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In this paper, a parametric investigation of the static and dynamic elasticity (stiffness coefficient) of the railway track and of the elastic pads of the fastenings is presented for the cases of Ballastless Track (Slab Track and Embedded Track), Transition Zone and Ballasted Track. Moreover, the influence of the variation of the static and dynamic elasticity on the acting forces on the track superstructure and substructure is investigated, a factor that is of decisive importance for the design of the Track layers and conclusions are drawn for the magnitude of the acting forces and of the mean pressure on formation …
The Effect Of Step Load Moving On The Surface Of A Cylindrical Cavity Using Neural Networks, Hamed Saeidi, Mansour Nikkhah-Bahrami
The Effect Of Step Load Moving On The Surface Of A Cylindrical Cavity Using Neural Networks, Hamed Saeidi, Mansour Nikkhah-Bahrami
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Potential functions and Fourier series method in the cylindrical coordinate system are employed to solve the problem of moving loads on the surface of a cylindrical bore in an infinite elastic and isotropic medium. The steady state dynamic equations of medium are uncoupled by applying potential functions. The medium responses are obtained by using an appropriate numerical method of Laplace transform inversion. The solution has an integral form; therefore, a feedforward backpropagation neural network is designed and trained using the response evaluated numerically in a finite set of random points to approximate stress and displacement components in the medium. It …
Numerical Modeling Of Buried Pipeline Crossing A Fault, Chaudhari Vasudeo Govind, Ramancharla Pradeep Kumar
Numerical Modeling Of Buried Pipeline Crossing A Fault, Chaudhari Vasudeo Govind, Ramancharla Pradeep Kumar
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Pipelines are common transportation means for oil and natural gas, which act as an important lifeline facility for any nation. Often the design of these pipelines is a difficult task because they commonly are installed underground passing through different types of soil media. Many of these existing pipelines run through the faulted area, which continuously exposed to considerable risk of failure due to movement along the fault. In this paper, a numerical study is carried out to understand stress development in buried pipeline subjected to fault motion with Mundra-Delhi pipeline as a case study. For this purpose, a 3D finite …
Response Spectrum Estimation Using Support Vector Machines, Jale Tezcan, Qiang Cheng, Lincoln Hill
Response Spectrum Estimation Using Support Vector Machines, Jale Tezcan, Qiang Cheng, Lincoln Hill
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This study investigates the applicability and efficiency of support vector machines for the problem of estimating the earthquake response spectra from the Fourier amplitude spectra of the ground motion acceleration. Two methods are commonly used for this purpose: time domain simulations, and the random vibration theory. The use of time domain simulations offers high accuracy at high computational cost, while the use random vibration theory, although not computationally intensive, requires knowledge of the statistical distribution of the response amplitudes. This study treats the task of estimating response spectra from the Fourier spectra as a nonlinear regression problem, and constructs a …
Analysis Of Aseismic Reliability Considering The Uncertainties Both Structural Parameters And Earthquake Loadings For The Gravity Type Earth-Retaining Wall, Zhiqiang Li, Jinbei Li, Yaping Kong
Analysis Of Aseismic Reliability Considering The Uncertainties Both Structural Parameters And Earthquake Loadings For The Gravity Type Earth-Retaining Wall, Zhiqiang Li, Jinbei Li, Yaping Kong
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A simple numerical deterministic approach for evaluating stochastic properties of structural systems with uncertain parameters under random seismic excitations (“double-random problem”) is presented. The method is based on the impulse response function method, the perturbation law and random central differential law. On the other hand, the equivalent linear model is used to account for the nonlinearity of soil. On the basis of the above random response analysis method, the aseismic reliability of earth-retaining wall is calculated and the analysis flow of dynamic reliability under the stationary random seismic action is also presented. From the above analysis, we can see that …
Dynamic Response Of Cantilever Retaining Walls Considering Soil Non-Linearity, Leuzzi Francesco, S. Foti, R. Lancellotta, G. Mylonakis
Dynamic Response Of Cantilever Retaining Walls Considering Soil Non-Linearity, Leuzzi Francesco, S. Foti, R. Lancellotta, G. Mylonakis
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
For many decades the analysis of earth retaining structures under dynamic or seismic conditions has been carried out by means of standard limit equilibrium (Coulomb, M-O) or elastic methods (Wood, Veletsos and Younan). These approaches are simplified, as they make use of considerable approximations which are often applicable only under particular conditions. A different and perhaps more realistic approach is possible using established computer codes, which integrate numerically the governing equations of the soil and wall media. Since these problems may involve significant levels of strain in the backfill, material non-linearity should be taken into account to realistically simulate the …