Seismic Behavior Of Asphaltic Concrete Core Dams,
2010
Tarbiat Moallem University, Iran
Seismic Behavior Of Asphaltic Concrete Core Dams, Ali Ghanbari, Mohsen Mojezi, Meysam Fadaee
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In current years the use of asphaltic concrete core dams are increased especially in some areas with shortage of clayey materials. These dams also have less earth work in comparison with clay core dams. Despite of many advantages of this kind of dam in compression of other types, the behavior of these dams against earthquakes and seismic condition isn't clearly specified. In this research using CA2 program (Finite difference Code) Some numerical studies about the behavior of asphaltic concrete core dams with various height and slopes to understand the influence of dam geometry on behavior of these dams under earthquake …
Seismic Performance Evaluation Of A Submarine Gas Pipeline,
2010
URS, Los Angeles, CA
Seismic Performance Evaluation Of A Submarine Gas Pipeline, Wolfgang H. Roth, C. B. Crouse, Ethan M. Dawson, Bei Su
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Analyses were conducted on the seismic performance of a proposed offshore gas flowline, which connects a manifold in 830-m water depth to a riser platform in shallow waters of the outer continental shelf. Climbing a 10-degree continental slope, the flowline will be installed on the seafloor underlain by deep carbonate sediments of sands and silty clays. Two types of analyses were performed for a critical segment of the flowline, where it traverses a narrow ridge flanked by two deep submarine canyons: (1) probabilistic analyses using simplified empirical methods; and (2) deterministic 2D and 3D analyses with FLAC using a nonlinear, …
Stability Analysis Of Flood Protection Embankments And Riverbank Protection Works,
2010
Water Resources Department, India
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 …
The Effects Of Canyon Topography On Dynamic Stress Distribution In Earth Dams,
2010
Iran University of Science and Technology, Iran
The Effects Of Canyon Topography On Dynamic Stress Distribution In Earth Dams, Maryam Malekian, Amirata Taghavi, Mohammad Hassan Baziar, Shirin Salemi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Limitations of computer storage capacity and high costs have generally restricted the use of numerical methods to two-dimensional dynamic analyses of earth dams. However, differences in canyon topographies in which the earth dams have been built may cause various constraining effects. Comparison between results of plane strain and three-dimensional dynamic analyses may reflect the site effects especially in narrow canyons. Consequently, considering the geometry of canyon, one may choose an appropriate method of dynamic analysis. This paper presents the effect of different canyon geometries on amount and distribution of induced dynamic stresses in plane strain and in three-dimensional analyses. These …
The Stability And Deformation Limit State Corresponding To The High Road Embankments Close To A Bridge,
2010
Technical University of Civil Engineering, Romania
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,
2010
International Institute of Earthquake Engineering and Seismology (IIEES), Iran
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 …
A Parametric Study On Soil-Pile Kinematic Interaction In Layered Soils,
2010
University of Catania, Italy
A Parametric Study On Soil-Pile Kinematic Interaction In Layered Soils, Daniela Ardita, Michele Maugeri, Ernesto Motta, Erminia Raciti
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In pile-foundation seismic design, until a few years ago, only inertial loads applied by the overstructure at the pile cap were taked into account, neglecting the dynamic interaction. So, good approaches to evaluate inertial interaction effects have been developed, but not for kinematic interaction. Modern national and international codes require to take into account the dynamic soil-pile-ovestructure interaction (inertial and kinematic), without giving any information about kinematic interaction evaluation criteria. In this work a practical method based on the Winkler foundation model is applied to analyse the seismic response of single piles. The analysis is focused on a single pile …
A Simple Numerical Tool For Dynamic Soil-Structure Interaction Analyses Including Non-Linear Behaviour Of Both Structure And Foundation,
2010
Politecnico di Milano, Italy
A Simple Numerical Tool For Dynamic Soil-Structure Interaction Analyses Including Non-Linear Behaviour Of Both Structure And Foundation, R. Figini, C. T. Chatzigogos, R. Paolucci
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In this paper a simple model to take into account dynamic non-linear soil-structure interaction is presented: it consists of a 1 degree-of-freedom (dof) superstructure and a 3 dof macro-element foundation. Both the superstructure and the soil-foundation system exhibit a non-linear behaviour. In particular the superstructure is characterized by an elastic perfectly plastic behaviour, while the foundation macro-element encompasses the two sources of non-linearity that arise in the soil-foundation interface: a) the one due to the irreversible elastoplastic soil behaviour (material non-linearity) and b) the one due to possible foundation uplift (geometric non-linearity). The global model thus entails the following features: …
A Simplified Approach For The Evaluation Of Kinematic Pile Bending,
2010
University of Catania, Italy
A Simplified Approach For The Evaluation Of Kinematic Pile Bending, Francesco Castelli, Valentina Lentini, Michele Maugeri
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
There are two sources of loading of the pile by the earthquake: “inertial” loading of the pile head caused by the lateral forces imposed on the superstructure, and “kinematic” loading along the length of the pile caused by the lateral soil movements developed during the earthquake. Seismic codes prescribe that piles have to be designed for soil deformations arising from the passage of seismic waves which impose curvatures and thereby lateral strains on the piles along their whole length. Accepting these lines, the new Italian seismic normative (NTC, 2008) specify that kinematic effects should be taken into account in the …
An Analytical Solution For Pile-Soil-Pile Interaction With Unequal Embedded Lengths Under Vertical Harmonic Vibrations,
2010
K. N. Toosi University of Technology, Iran
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,
2010
Isfahan University of Technology, Iran
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,
2010
University of Bologna, Italy
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 …
Analytical Method For Seismic Bearing Capacity Of Stone-Column Reinforced Shallow Foundations,
2010
Islamic Azad University, Iran
Analytical Method For Seismic Bearing Capacity Of Stone-Column Reinforced Shallow Foundations, Javad Nazari Afshar, Mahmoud Ghazavi, Khashayar Hemmati
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Stone-columns is a useful method for increasing bearing capacity and reducing settlement of foundation soil subjected to structure loading. For stone-column construction, 15 to 35 percent of weak soil volume is usually replaced with stone-column material. Such columns may be constructed with various diameters, lengths, and center-to-center distances. This paper presents a simple method to determine the seismic bearing capacity of stone-column reinforced shallow foundation. For this purpose, a simple failure surface is assumed to characterize the failure stage of the stone column and soil materials using the concept of lateral active and passive earth pressures. The well known Mononobe-Okabe …
Computational Modeling Of A Large Pile Group Under Lateral Load,
2010
University of California, San Diego, La Jolla, CA
Computational Modeling Of A Large Pile Group Under Lateral Load, Jinchi Lu, Ahmed Elgamal, Charles Sikorsky, Thomas Shantz
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The lateral load resistance of pile foundations is critically important to the design of structures that may be subjected to earthquakes. This paper presents computational modeling results of the response of a large pile group system under lateral load. The open-source platform OpenSees is employed to conduct a nonlinear 3-dimensional finite element analysis. The piles are modeled by beam-column elements, and rigid beam-column elements are used to model the pile size (diameter). In order to facilitate the pre- and post-processing phases, a recently developed user interface OpenSeesPL is employed. Distribution of load within the pile group is presented and the …
Variability In Earthen Levee Seismic Response Due To Time-History Selection,
2010
The University of Michigan, Ann Arbor, MI
Variability In Earthen Levee Seismic Response Due To Time-History Selection, Adda Athanasopoulos-Zekkos
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In seismic slope stability analyses the single most important input parameter is the ground motion. Time-history selection is a challenging engineering problem since the variability in ground motion characterization is in part due to the complexity of the mechanisms that result in a seismic event taking place and the path and soil conditions from the origin of the seismic event to the location of interest. In this study, the effect of key ground motion parameters to the dynamic response of earthen levees is investigated. Specifically, the effect on the induced cyclic shear stress ratio (CSR) and/or seismically induced Newmark-type, permanent …
1d Dynamic Non-Linear Numerical Analysis Of Earth Slopes: The Role Of Soil Ductility And Time-Sensitiveness,
2010
Politecnico di Milano, Italy
1d Dynamic Non-Linear Numerical Analysis Of Earth Slopes: The Role Of Soil Ductility And Time-Sensitiveness, Claudio Giulio Di Prisco, Federico Pisanò
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The mechanical response of dry granular slopes subjected to dynamic perturbations is tackled from a theoretical/numerical viewpoint. A 1D geometrical/numerical scheme is adopted to analyze infinitely long strata: the dynamic activation of shallow translational failure mechanisms (as well as the displacement performance far from collapse) is analyzed by means of a self-made FEM code. The soil mechanical behavior is described by means of a simplified viscoplastic one-dimensional constitutive model, capable of reproducing both ductile (hardening) and brittle (softening) mechanical responses. The dependence of numerical results on the soil “time-sensitiveness”, as well as the differences between viscoplasticity and standard rate-independent plasticity, …
Layers Heights Randomness Effect On Seismic Response Of A Site In Algiers (Algeria),
2010
Université Paris-Est, France
Layers Heights Randomness Effect On Seismic Response Of A Site In Algiers (Algeria), M. Badaoui, M. K. Berrah, A. Mebarki
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper deals with the stochastic seismic analysis of a site in the city of Algiers (Algeria), which is composed by superposed layers over an elastic halfspace. Layers heights are assumed to be random variables with a lognormal distribution, which is suitable for strictly non-negative random variables. The analysis is carried out via Monte Carlo simulations coupled to the stiffness matrix method. A parametric study is conducted do derive the stochastic behavior of the extreme ground acceleration, its response spectrum and the transfer function. The soil height coefficient of variation is varied from 0 (corresponding to the homogeneous case) to …
Displacement Design Spectrum Model Accounting For Non-Linear Site Effects,
2010
University of Hong Kong, Hong Kong
Displacement Design Spectrum Model Accounting For Non-Linear Site Effects, Hing-Ho Tsang, M. Neaz Sheikh, Srikanth Venkatesan, Nelson T. K. Lam
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Displacement design response spectrum is an essential component for the currently-developing displacement-based seismic design and assessment procedures. This paper proposes a new and simple method for constructing displacement design response spectra on soft soil sites. The method takes into account modifications of the seismic waves by the soil layers, giving due considerations to factors such as the level of bedrock shaking, material non-linearity, seismic impedance contrast at the interface between soil and bedrock, and plasticity of the soil layers. The model is particularly suited to applications in regions with a paucity of recorded strong ground motion data, from which empirical …
Uniform Hazard Response Spectra Of Korea Considering Uncertainties In Ground Properties,
2010
University of California, Los Angeles, CA
Uniform Hazard Response Spectra Of Korea Considering Uncertainties In Ground Properties, Dong-Yeop Kwak, Duhee Park, Bang Woong Shin, Kwangkyun Kim
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The seismic site coefficients derived deterministically are often used with ground motion parameters determined by probabilistic seismic hazard analysis in construction of the design response spectrum. There is, therefore, an inherent incompatibility between two approaches. New methods have been developed to resolve this incompatibility by developing probabilistic seismic site coefficients. In such approaches, the uncertainties in the properties of the ground were not systematically accounted for due to lack of measurements of the ground. In this study, an integrated probabilistic seismic hazard analysis which can quantify the nonlinear seismic site effects and account for the uncertainties in soil properties is …
Multidisciplinary Study Of Seismic Wave Amplification In The Historical Center Of Rome, Italy,
2010
Institute of Radioprotection and Nuclear Safety (IRSN), France
Multidisciplinary Study Of Seismic Wave Amplification In The Historical Center Of Rome, Italy, Fabian Bonilla, Anna Chiara Giacomi, Francesca Bozzano, Luca Lenti, Celine Gélis, Salvatore Martino, Jean-François Semblat
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Assessment of potential strong ground motion within the city of Rome is crucial to preserve its millenary monumental heritage and protect its large urban settlements. Rome is located at a distance of some tens of kilometers from the central Apennines seismogenic zone, where earthquakes of tectonic origin and of a magnitude of up to 7.0 are expected. The geological bedrock is mainly represented by high - consistency fine grained marine sedimentary deposits Pliocene to lower Pleistocene aged and named Monte Vaticano Unit. An upper Pleistocene – Holocene succession of fluvial deposits partially fill the paleo-valley of the Tiber river and …
