A Study On The Seismic Response Of Ground And Reinforced Concrete Buildings In Belgaum Region, India,
2010
Bangalore University, India
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 …
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 …
Effective Stress V/S Total Stress Ground Response Analyses For A Typical Site In Chennai (India),
2010
Indian Institute of Technology Madras, India
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 …
Evaluation Of Frequency Dependent Equivalent Linear Analysis,
2010
Hanyang University, Seoul, Korea
Evaluation Of Frequency Dependent Equivalent Linear Analysis, Chang-Gyun Jeong, Dong-Yeop Kwak, Duhee Park, Kwangkyun Kim
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
One dimensional equivalent linear site response analysis is widely used in practice due to the simplicity and ease of use. In the method, the dynamic soil properties are assumed to be independent of the loading frequency. To better simulate the nonlinear behavior, equivalent analysis methods that models the loading frequency dependence of the shear modulus and damping were developed. The backbone of the methods is the frequency-dependent shear strain curves. Various forms of the frequency-dependent shear strain curves were developed. However, the effect of the frequency - shear strain curves are not well known and documented. In this study, a …
Evaluation Of Local Site Conditions Using Ambient Seismic Noise Recordings: A Case Study From Ankara, Turkey,
2010
Gazi University, Turkey
Evaluation Of Local Site Conditions Using Ambient Seismic Noise Recordings: A Case Study From Ankara, Turkey, M. K. Koçkar, H. Akgün
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper aims to investigate the site response of the sediment characteristics and to perform seismic hazard studies in Ankara, Turkey through conducting short-period noise recordings of microtremor measurements at 352 project site locations on the Upper Pliocene to Pleistocene fluvial and particularly Quaternary alluvial and terrace sediments in the Ankara basin. The spectral ratios relative to a firm site reference station (SSR) and the spectral ratio between the horizontal and vertical components (HVSR) of the microtremor measurements at the ground surface have been used to estimate the fundamental periods and the amplification factors of the site. The results of …
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 …
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 …
Site Response Study Of Deep Soil Column In Lucknow, India,
2010
Indian Institute of Science, India
Site Response Study Of Deep Soil Column In Lucknow, India, P. Anbazhagan, Abhishek Kumar, T. G. Sitharam
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Earthquake activities in the many parts of world had shown the importance of local soil condition in the propagated wave motion. In this paper an attempt has been made to estimate site effects of deep soil column in Lucknow, Indo-Gangetic basin for scenario earthquakes at Himalayan plate boundary. Based on previous study, the synthetic ground motion has been generated using Stochastic Finite Fault model (FINSIM) for two scenario earthquakes at seismic gaps. One seismic gap called as western location/seismic gap is located about 307.88km from site and gives the peak ground acceleration of 0.11g at site. Another one is the …
Site Specific Seismic Analysis Of A Deep Stiff Soil Site,
2010
Indian Institute of Technology Madras, India
Site Specific Seismic Analysis Of A Deep Stiff Soil Site, S. Krishna Kumar, A. Boominathan
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Site specific analysis was carried out for a deep stiff soil site located near Ahmedabad, India. The site predominantly consists of sandy clay and silty sand layer in the top 30m with Vs varying from 430 to 750m/s. It is followed by a high plastic stiff clay layer cemented with sand and gravel with unusually high Vs above 1000m/s. The study region surrounded by 13 major faults has experienced several major earthquakes including the disastrous Bhuj earthquake (Mw=7.7). The seismic hazard level at the site was estimated by deterministic approach and the East Cambay fault with Mw of …
Site-Specific Response Analysis In The New Madrid Seismic Zone,
2010
Black & Veatch Corporation, Overland Park, KS
Site-Specific Response Analysis In The New Madrid Seismic Zone, Wei Zheng, Youssef Hashash, Mark M. Petersen, Andrew S. Whittaker
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A coal-fired power plant, Plum Point Energy Station, is being built in the city of Osceola, Arkansas, which is located in the New Madrid Seismic Zone (NMSZ). The project site is characterized as Site Class F, according to ASCE-7-05, because the soils at the site are prone to liquefaction. The depth of soil to rock is approximately 1 kilometer (km). A site-specific response study was required by the building code to determine the uniform hazard spectrum at the ground surface. The site-specific study included a probabilistic seismic hazard assessment to determine the Maximum Considered Earthquake (MCE) spectrum at an equivalent …
Topographic Site Effects Evaluation For The Monte Po Hill In The City Of Catania (Italy),
2010
University of Catania, Italy
Topographic Site Effects Evaluation For The Monte Po Hill In The City Of Catania (Italy), Antonio Ferraro, Salvatore Grasso, Michele Maugeri
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The Monte Po Hill is located in the North-eastern part of the city of Catania; this area is prone to high seismic risk due to the presence of several constructions, including a school, in the vicinity of a toe of a slope, characterized by precarious stability conditions. The study has regarded the evaluation of site effects in correspondence of the site, to which corresponds a different value of the Seismic Geotechnical Hazard. In the beginning of 2007 a seismic station has been also located into the school building, with the aim of recording seismic events. Seismograms obtained by the seismic …
A Note On The Effect Of Non-Plastic Fines On The Liquefaction And Reconsolidation Volumetric Strain Behaviour Of Sands,
2010
Indian Institute of Science, India
A Note On The Effect Of Non-Plastic Fines On The Liquefaction And Reconsolidation Volumetric Strain Behaviour Of Sands, T. G. Sitharam, B. V. Ravishankar, J. S. Vinod
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper discusses the influence of non- plastic fines on the liquefaction and reconsolidation volumetric strain behaviour of sand based on the strain controlled cyclic triaxial experimental results. The investigations were carried out on sand samples collected from earthquake-affected area of Ahmedabad city of Gujarat state in India. Laboratory investigations were conducted on clean sand (prepared from the natural sand) samples with varying amount of non-plastic fines. Experimental results highlight a considerable influence of non-plastic fines on the resistance to liquefaction and reconsolidation volumetric strains behaviour during cyclic loading.
Application Of General Regression Neural Networks (Grnns) In Assessing Liquefaction Susceptibility,
2010
Housing & Building Research Center, Egypt
Application Of General Regression Neural Networks (Grnns) In Assessing Liquefaction Susceptibility, Suzan S. Salem, Khalid El-Zahaby
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Liquefaction is considered among the most important hazards associated with earthquakes. The damage resulting from seismic liquefaction may be huge; thus, there always exists needs to mitigate the damage associated with such risks. One of the main problems challenging geotechnical engineers is how to assess the seismic liquefaction hazard. Statistical and probabilistic approaches for seismic liquefaction are currently available. In this paper, a general regression neural networks approach (GRNNs) has been used to assess the liquefaction hazard in Egypt. Thus, data from new locations can be analyzed using GRNNs to obtain the liquefaction risk associated with this new site. The …
Assessment Of Liquefaction Potential Relevant To Choice Of Type And Depth Of Foundations In Seismically Active Areas,
2010
University of Belgrade, Republic of Serbia
Assessment Of Liquefaction Potential Relevant To Choice Of Type And Depth Of Foundations In Seismically Active Areas, Hadži-Niković D. Gordana, Perković D. Ilija, Abolmasov Biljana
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
There is evidence of great increase of pore pressures in saturated sand soils during cyclic loading caused by earthquakes. These increased pore pressures can often increase to effective stresses in soil. Dependant on sand density, this can lead to a total loss of shear strength, liquefaction or greater deformability of soil. Emergence of liquefaction or great deformations within soil can cause significant damage or total destruction of constructions on the ground, even when they have been correctly designed. For this reason, it is very important to perform detailed geotechnical and seismic investigations of ground conditions and evaluate liquefaction potential for …
Assessment Of Liquefaction Susceptibility Of Geological Units In The Area Of Gulf Of Corinth, Greece,
2010
Aristotle University of Thessaloniki, Greece
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 …
Case Histories Of Widespread Liquefaction And Lateral Spread Induced By The 2007 Pisco, Peru Earthquake,
2010
Kleinfelder, San Diego, CA
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 …
Cyclic Instability Behaviour Of Sand-Silt Mixture Under Partial Cyclic Reversal Loading,
2010
University of New South Wales at Australian Defense Force Academy, Australia
Cyclic Instability Behaviour Of Sand-Silt Mixture Under Partial Cyclic Reversal Loading, Md. Abdul Lahil Baki, Sik-Cheung Robert Lo, Md. Mizanur Rahman
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Flow liquefaction is one of the most catastrophic failure phenomena in geotechnical engineering. It is a form of instability and can be observed during monotonic loading or cyclic loading. It is referred to as static instability/liquefaction for monotonic loading and cyclic instability for cyclic loading. To investigate the link between these behaviours, a number of stress controlled cyclic triaxial tests were carried out on loose sand-silt mixture under cyclic ‘reversal’ and ‘non-reversal’ loading condition. Cyclic reversal loading was partial reversal. Its peak-trough magnitudes were chosen in such a way that cyclic instability was triggered in compression side of the stress …
Dem Simulation Of Liquefaction-Induced Lateral Spreading,
2010
Southern Methodist University, Dallas, TX
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 …
Effect Of Density On Critical Depth Of Liquefaction In A Soil Deposit Containing Double Loose Sand Lenses,
2010
Amirkabir University of Technology, Iran
Effect Of Density On Critical Depth Of Liquefaction In A Soil Deposit Containing Double Loose Sand Lenses, S. M. Mir Mohammad Hosseini, Y. Pashang Pisheh, K. Shakiba Nia, N. Ganjian
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Large surface deformations due to liquefaction have been observed in many soil deposits which seem to feature good geotechnical characteristics. These deformations are often caused by the liquefaction of sand layers surrounded by clayey or silty soils called “sand lenses”. Liquefaction potential often decreases with increasing of depth. Hence, a specific depth of embedment of the lenses can be defined below which liquefaction would unlikely happen or the consequential surface deformation would be negligible. This depth is called critical depth. This research aims at studying the effects of the relative density of the sand within the lenses on the critical …
Effective Stress Based Numerical Assessment Of Liquefaction-Induced Landslide At Degirmendere Cape, Izmit Bay During Kocaeli (Izmit)-Turkey Earthquake,
2010
Middle East Technical University, Turkey
Effective Stress Based Numerical Assessment Of Liquefaction-Induced Landslide At Degirmendere Cape, Izmit Bay During Kocaeli (Izmit)-Turkey Earthquake, Sevinc Unsal Oral, Kemal Önder Çetin
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper presents the numerical assessment of seismically-induced slope instability observed at Degirmendere Cape, Izmit Bay during Kocaeli (Izmit)-Turkey earthquake. As is evident from the name of the site, Degirmendere Cape site is located at the north of Degirmendere, on a small intrusion into the Bay of Izmit. At Degirmendere Cape, there existed a municipality owned hotel and recreational areas. During the earthquake following slumping of the fill material, the site was unindated. All the recreational facilities as well as the municipality hotel were lost to Marmara Sea with its residents. Failure mechanism was attributed to fault rupture/seismically induced slope …
