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Articles 571 - 600 of 1220
Full-Text Articles in Civil and Environmental Engineering
Soil Dynamics Course Speakers, Ahmed Elgamal, Shamsher Prakash
Soil Dynamics Course Speakers, Ahmed Elgamal, Shamsher Prakash
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Meet Our Authors, Multiple Authors
Meet Our Authors, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Soil Dynamics Short Course, Ahmed Elgamal, Shamsher Prakash
Soil Dynamics Short Course, Ahmed Elgamal, Shamsher Prakash
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Cooperating Organizations, Multiple Members
Cooperating Organizations, Multiple Members
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Paper Review Committee, Multiple Members
Paper Review Committee, Multiple Members
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
San Diego Committee, Multiple Members
San Diego Committee, Multiple Members
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Steering Committee, Multiple Members
Steering Committee, Multiple Members
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
General Report — Session 7, Jorge F. Meneses, Ioannis Anastasopoulos
General Report — Session 7, Jorge F. Meneses, Ioannis Anastasopoulos
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
General Report — Session 8, Tara C. Hutchinson, Scott M. Olson
General Report — Session 8, Tara C. Hutchinson, Scott M. Olson
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Soil Improvement Techniques For Mitigation Of Seismic Hazards - An Overview, Ram Prasad Sharma
Soil Improvement Techniques For Mitigation Of Seismic Hazards - An Overview, Ram Prasad Sharma
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
If seismic hazards are deemed to be unacceptably high because of poor soil conditions, it is often possible to achieve improved seismic performance through the use of one or more soil improvement techniques. Poor performance is the result of inadequate strength, low stiffness, or insufficient drainage. Many improvement techniques have been evolved over the years, mostly through trial and error, aimed at improving at least one of these properties. When selecting one or more mitigation methods, it is important to consider the effectiveness of the improvement approach for the particular situation at hand, cost, environmental consequences, regulatory requirements, and technical …
Threshold Shear Strain For Cyclic Degradation Of Three Clays, Kentaro Tabata, Mladen Vucetic
Threshold Shear Strain For Cyclic Degradation Of Three Clays, Kentaro Tabata, Mladen Vucetic
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Cyclic threshold shear strain, γt, is small cyclic shear strain amplitude above which soil properties significantly change with the number of cycles, N, and below which such changes are for all practical purposes negligible. To date, three cyclic threshold shear strains have been experimentally verified: for cyclic settlement (cyclic compression), for residual cyclic pore water pressure, and for cyclic stiffening. Subject of the paper is testing of fourth cyclic threshold shear strain for cyclic degradation, γtd. When fully saturated soil is subjected in undrained conditions to moderate or large cyclic strain-controlled loading, its secant shear modulus, …
Residual Strength Of Liquefied Sand: Laboratory Vs. Field Measurements, Julián Sandoval, Pedro De Alba, Thomas P. Ballestero, Barry K. Fussell
Residual Strength Of Liquefied Sand: Laboratory Vs. Field Measurements, Julián Sandoval, Pedro De Alba, Thomas P. Ballestero, Barry K. Fussell
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Determining the residual strength of liquefied sand is essential for estimating post-earthquake stability of vulnerable earth structures, or calculating runout of liquefaction flow slides. Current practice is to select values from a database of back-calculated residual strengths from failure case histories, which have been related to representative penetration test resistance numbers in the failed materials. Given the uncertainties involved, it is desirable to compare the field data with laboratory tests under controlled conditions. This paper describes residual strength measurements for a uniform fine sand using two recently-developed tests designed to impose large strains and strain rates: a modified triaxial test …
Large Scale Model Test For Pile-Supported Wharf In Liquefied Sand, Wen-Jong Chang, Jyh-Fang Chen, Hsing-Chuan Ho
Large Scale Model Test For Pile-Supported Wharf In Liquefied Sand, Wen-Jong Chang, Jyh-Fang Chen, Hsing-Chuan Ho
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Pile-supported wharf is a general option in port design to provide lateral resistance and bearing capacity under both static and dynamic loadings. In situ large-scale physical modeling using surface wave generator was performed to study the dynamic soil-structure interactions in pile-supported wharves and to serve as a prototype for in situ monitoring station. A wharf model consisting of 2 steel pipe piles welded on a steel slab was installed on a reconstituted underwater embankment. Due to screening of stress wave, the two piles are subjected to different loading conditions. Data reduction procedures were developed to analyze coupled shear strain-pore pressure …
Sphere Penetration Experiments In Vertically Vibrated Sand, Nicolas Denies, Jean Canou, Jean-Noël Roux, Alain Holeyman
Sphere Penetration Experiments In Vertically Vibrated Sand, Nicolas Denies, Jean Canou, Jean-Noël Roux, Alain Holeyman
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The paper concerns vibrodriving and vibrocompaction processes applied to granular soils and presents experiments able to characterize the behaviour of sand subjected to vertical vibration. Soil degradation phenomena arising during vibro-driving are first described and the vibro-fluidization of dry granular matter is discussed. The paper concentrates on the shear strength degradation of vibrated dry granular soils. Vertical vibration is then particularly investigated. The volume change during vertical vibration is described and the sand behaviour during vibration is also discussed. One focuses on the influence of the acceleration on the dry density after vibration. Finally, new sphere penetration experiments (SPE) based …
Multi-Modal Synthesis And Variable Modulus Effects In Resonant Column Tests By Random Excitations, Jeramy C. Ashlock, Ronald Y. S. Pak
Multi-Modal Synthesis And Variable Modulus Effects In Resonant Column Tests By Random Excitations, Jeramy C. Ashlock, Ronald Y. S. Pak
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
To extend current measurement and data synthesis techniques for resonant column testing, random vibration transfer functions measured using a modified 6 inch (152.4 mm) diameter Drnevich free-free resonant column device are evaluated against viscoelastic theories of homogeneous and heterogeneous soil models. By means of the transfer function approach, it is found that the first four resonant peaks of the soil column response can be captured experimentally with some instrumental adaptations. By calibration against theoretical transfer functions, the ability to characterize the modulus and damping properties of the soil samples over a broad range of frequencies is demonstrated. As a generalization …
Influence Of Densification Method On Some Aspects Of Undrained Silty Sand Behavior, Mehmet Murat Monkul, Jerry A. Yamamuro
Influence Of Densification Method On Some Aspects Of Undrained Silty Sand Behavior, Mehmet Murat Monkul, Jerry A. Yamamuro
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Different specimen preparation methods such as moist tamping, dry funnel deposition, slurry deposition, dry air pluviation have been reported in the literature to investigate the undrained behavior of silty sands. Similarly, different means have been used to densify the soils prepared with such methods. Ongoing research shows that the change in undrained behavior (e.g. change in initial peak deviator stress and instability angle) due to different deposition densities is significantly affected by the densification technique utilized within a particular deposition method. It is believed that those variations are closely related with changes in the initial soil fabric that is achieved …
Attenuation Of Traffic Induced Ground Borne Vibrations Due To Heavy Vehicles, Ozgur L. Ertugrul, Deniz Ulgen
Attenuation Of Traffic Induced Ground Borne Vibrations Due To Heavy Vehicles, Ozgur L. Ertugrul, Deniz Ulgen
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Traffic induced vibrations, which are transmitted through the ground, may interfere with the proper operation of vibration sensitive equipments and cause nuisance on local population. Influence of these vibrations on surrounding buildings and sensitive devices play an important role on acceptance of the projects. In this study, main objective is the estimation of ground-borne vibration levels due to operation of heavy vehicles at two different sites where soil type and stratification significantly differs. For this purpose, site specific vibration surveys are conducted. A series of dynamic finite element modeling analyses are performed to predict actual vibration records at measurement points. …
Dynamic Analysis Of Piles Under Lateral Harmonic Vibration, Mahmoud Ghazavi, Ahmad Dehghanpour
Dynamic Analysis Of Piles Under Lateral Harmonic Vibration, Mahmoud Ghazavi, Ahmad Dehghanpour
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper presents a new mathematical approach for the analysis of harmonically vibrating horizontal, linear, elastic uniform pile. The soil properties may vary from layer to layer. No separation is allowed at the soil-pile interface. The pile is modeled as a number of cylindrical segments connected by rigid nodes. The length of each segment is chosen such that the effects of the soil inhomogenity are accounted for. The governing differential equation for an arbitrary pile segment is obtained and solved. According to the pile support types such as pinned, fixed and free conditions, first an arbitrary appropriate value for either …
Influence Of Dislocations On Bumps Occurrence In Deep Mines, Petr P. Prochazka
Influence Of Dislocations On Bumps Occurrence In Deep Mines, Petr P. Prochazka
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The problem of bumps occurrence in deep mines during longwall mining appears to be one of the most serious in the design of engineering of mining. They are caused for various reasons, but basically it is an aftermath of accumulated energy, which is released under some unfavorable conditions. In this paper the influence of given dislocations and their slope in a coal seam are studied based on free hexagon method. This method belongs to a set of discrete element methods and enables one to define and calculate stresses in natural way along the interfacial boundaries of adjacent particles (elements). Since …
State Of The Art And Practice (Soap) Speakers, Multiple Authors
State Of The Art And Practice (Soap) Speakers, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Spouse Program, Sally Prakash
Spouse Program, Sally Prakash
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Vibrations Due To Dynamic Compaction, M. Ayşen Lav, Ercan Yüksel, Faruk Karadoğan
Vibrations Due To Dynamic Compaction, M. Ayşen Lav, Ercan Yüksel, Faruk Karadoğan
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Ground vibrations due to dynamic compaction (DC), at a harbor site were measured to investigate whether the magnitude of vibrations were unacceptably strong to cause any damage to or increase existing damage on the surrounding structures experienced August 17, 1999 Kocaeli, Gölcük earthquake (M~7.4). The site is located in city of Kocaeli at the seaside of The Port of Derince. It was a reclaimed land formed with Hereke limestones. The measured data included vibrations induced by the tamping energy of DC both at the vicinity of nearby structures and within the DC site. The site was surrounded by a shallow …
Evaluation Of Iranian Code No.2800 For Seismic Resistant Design Of Near Source Buildings Based On Real Record Of Iran, Kaveh Andisheh, Gholamreza Ghodrati Amiri
Evaluation Of Iranian Code No.2800 For Seismic Resistant Design Of Near Source Buildings Based On Real Record Of Iran, Kaveh Andisheh, Gholamreza Ghodrati Amiri
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In this paper characteristics of near-field earthquakes and difference of ground motion response key parameters in these earthquakes, based on real records of Iran are presented and efficiency of Iranian seismic building code for design of buildings subjected to near-field earthquakes is evaluated. The equivalent static method to calculate the lateral earthquake force exerted on buildings, is common and extensively used. Iranian code of practice for seismic resistant design of buildings, Standard No.2800-05, uses V= (ABI /R)*W relationship to calculate this lateral force. Where A (=design basis acceleration over the bedrock) and B (=the amplification factor) are related to earthquake, …
Experimental And Numerical Study Of Topographic Site Effect On A Hill Near Tehran, Mohammad Khandan Bakavoli, Ebrahim Haghshenas
Experimental And Numerical Study Of Topographic Site Effect On A Hill Near Tehran, Mohammad Khandan Bakavoli, Ebrahim Haghshenas
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper compares the experimental study of seismic response of a hill site near Tehran and numerical modeling of the test site using a hybrid finite-boundary element code named HYBRID. Both longitudinal and transversal profiles of the hill have been instrumented using Guralp CMG-6TD seismological stations and some hours of ambient noise were recorded. The H/V ratios for each station were calculated and the amplification patterns and corresponding frequencies of each station have been extracted. Then the two profiles has been modeled numerically and excited by vertically incident SV ricker waves with different fundamental frequencies. The medium is assumed to …
Seismic P-Wave Polarization In The Context Of On-Site Early Warning System, Anton Zaicenco, Sharlie Huffman, Iain Weir-Jones
Seismic P-Wave Polarization In The Context Of On-Site Early Warning System, Anton Zaicenco, Sharlie Huffman, Iain Weir-Jones
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Design of an on-site seismic early warning system for critical facilities, based on P-wave detection, requires knowledge of local seismicity, analysis of strong-motion records, and local geological settings. The scope of current paper is to present an efficient and reliable methodology for P-wave detection and discrimination. It is tolerant to the environmental, traffic and other types of noise at the location of the critical facility. The basic idea that is exploited in the proposed algorithm is the degree of P-wave polarization, which is obtained with Karhunen- Loève transform of the orthogonal triaxial records. A system consisting of borehole sensor array …
Selection Of Ground Motion Records For Two Dam Sites In Oregon, Kenji Yamasaki, Andy Vessely, Chris Carpenter
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 …
The Limitations Of Equivalent Linear Site Response Analysis Considering Soil Nonlinearity Properties, S. M. Mir Mohammad Hosseini, M. Asadolahi Pajouh, F. Mir Mohammad Hosseini
The Limitations Of Equivalent Linear Site Response Analysis Considering Soil Nonlinearity Properties, S. M. Mir Mohammad Hosseini, M. Asadolahi Pajouh, F. Mir Mohammad Hosseini
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Seismic site effect has been a major issue in the field of earthquake engineering due to the large local amplification of the seismic motion. This paper presents the importance of an appropriate soil behavior model to simulate earthquake site response and gives a critical overview of the field of site response analysis. Some of the well known site response analysis methods are summarized and discussed. The objective of this paper is to investigate the influences of nonlinearity on the site response analysis by means of a more precise numerical model. In this respect, site responses of four different types of …
Weak Motion Linear Soil Amplification At Aegion, Greece, And Comparison With Seismic Design Codes, Olga-Joan Ktenidou, Dimitris Raptakis, Kyriazis Pitilakis
Weak Motion Linear Soil Amplification At Aegion, Greece, And Comparison With Seismic Design Codes, Olga-Joan Ktenidou, Dimitris Raptakis, Kyriazis Pitilakis
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
We use 473 weak motion surface records from a relatively soft soil site (CORSSA) and 81 from a relatively stiff soil site (DIM) in conjunction with downhole records obtained in rock in order to study linear seismic soil amplification in Aegion, Greece. We estimate peak ‘soil-to-outcrop’ amplification factors in the time domain for the two sites through linear regression of PGA values. We view the results derived from these very weak motion records as indicative of the entire linear elastic range based on the large dataset size. We compare the peak horizontal soil amplification factors we derive from records with …
Artificial Neural Network Model For Prediction Of Liquefaction Potential In Soil Deposits, F. Farrokhzad, A. J. Choobbasti, A. Barari
Artificial Neural Network Model For Prediction Of Liquefaction Potential In Soil Deposits, F. Farrokhzad, A. J. Choobbasti, A. Barari
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
With the increase in population, the evaluation of liquefaction is becoming more important for land use planning and development. In soil deposits under undrained condition, earthquakes induce cyclic shear stresses, may lead to soil liquefaction. Artificial neural network (ANN) is one of the, artificial intelligence (AI) approaches that can be classified as machine learning. Simplified methods have been practiced by researchers to assess nonlinear liquefaction potential of soil. In order to address the collective knowledge built up in conventional liquefaction engineering, an alternative general regression neural network model is proposed in this paper. To meet this objective, a total of …
Cpt-Based Comparative Mapping Of Liquefaction Hazard For Large Areas, Johann Facciorusso, Marco Uzielli, Giovanni Vannucchi
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 …