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On The Use Of Empirical Correlations For Estimating The Residual Undrained Shear Strength Of Liquefied Soils In Dam Foundations, David Rees Gillette May 2010

On The Use Of Empirical Correlations For Estimating The Residual Undrained Shear Strength Of Liquefied Soils In Dam Foundations, David Rees Gillette

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

Current practice (2009) for seismic analysis of embankment dams relies heavily on empirical correlations with penetration resistance (standard penetration test or cone penetration test) to predict the residual undrained shear strength of liquefied foundation materials. At least six such relationships have been published for the SPT alone, in different “formats.” Some apply a fines adjustment to the SPT blowcounts, but others do not; some express the predicted strength as a ratio with pre-earthquake effective overburden stress, whereas others predict it directly, without explicit consideration of overburden. For the foundations of embankment dams, the difference between the strength-ratio approach and prediction ...


Repair Of Landslide "Umka-Duboka" — Seismic Performance Assessment, Vlatko Sesov, Zeljko Zugic May 2010

Repair Of Landslide "Umka-Duboka" — Seismic Performance Assessment, Vlatko Sesov, Zeljko Zugic

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

The Umka-Duboko is a large active landslide in the depth of 10-26 m, created in marly clays, taking up the area of 1.8 sq.km. According to the fact that the new road facility corridor located at the right bank of Sava river, on the meandering apex, crosses the landslide in the length of 3 km the characteristic remediation design solution is given. In this paper is observed seismic performance of this project. The analysis of potential liquefaction in motorway embankment and seismic stability of slope retained by embankment and hydraulic structure were made. The necessity was despite the ...


Numerical Analysis Of Failure Of Rudramatha Dam Section During 26Th January, 2001, Bhuj Earthquake, Amit Srivastava, G. L. Sivakumar Babu May 2010

Numerical Analysis Of Failure Of Rudramatha Dam Section During 26Th January, 2001, Bhuj Earthquake, Amit Srivastava, G. L. Sivakumar Babu

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

On 26th January, 2001, the Kachchh region of Gujarat, India faced devastating earthquake of magnitude 7.6 (Mw) popularly known as “Bhuj” earthquake. Various man made facilities including earthen dams faced varying level of damages during the earthquake and one of the major causes of failure is attributed to wide spread liquefaction of foundation soil. In the present study, a typical Rudramata dam sections located in the Kachchh region is considered for the failure analysis using fully coupled nonlinear dynamic numerical code FLAC 5.0 with pore pressure generation capabilities under dynamic loadings. The analysis is performed using the ...


Seismic Analysis Of The Reservoir-Earth Dam-Pore Fluid System Using An Integrated Numerical Approach, Yanhui Han, Roger Hart May 2010

Seismic Analysis Of The Reservoir-Earth Dam-Pore Fluid System Using An Integrated Numerical Approach, Yanhui Han, Roger Hart

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

In this paper, an integrated numerical approach is proposed for analyzing the seismic response of the reservoir-earth dam-pore fluid system subjected to earthquake loading. The fluid-mechanical coupling approach is deployed to capture the fluid-solid matrix coupling effects automatically. A hysteretic damping constitutive law is adopted to follow the modulus reduction and damping ratio curves. The Finn-Byrne equation is used to represent the shear-induced volumetric strain behavior of liquefiable materials. The interaction between the reservoir water and the dam boundary is treated as a dynamically updated pressure boundary condition. The deconvolution is accomplished by the equivalent linear program SHAKE. An automatic ...


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

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

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

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


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

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

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

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


Dynamic Response Of Cantilever Retaining Walls Considering Soil Non-Linearity, Leuzzi Francesco, S. Foti, R. Lancellotta, G. Mylonakis May 2010

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 ...


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

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

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

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


Application Of Vertical Reinforcement For Performance Enhancement Of Reinforced Soil Under Seismic Loading, Binod Shrestha, Hadi Khabbaz May 2010

Application Of Vertical Reinforcement For Performance Enhancement Of Reinforced Soil Under Seismic Loading, Binod Shrestha, Hadi Khabbaz

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

Reinforced soils have been widely used in geotechnical structures as a result of their satisfactory performance and cost effectiveness. A number of investigations have been carried out to find out the seismic deformation modes of reinforced soil walls with conventional horizontal inclusions. This study puts forward a new concept of soil reinforcement, applying vertical reinforcement together with conventional horizontal reinforcement. A key difference between the general practice and after insertion of vertical reinforcement is that the latter not only provides passive resistance against shearing due to making intact layers but also increases the strength and stability of the reinforced soil ...


Effects Of Wall-Soil-Structure Interaction On Seismic Response Of Retaining Wall, Aditya Parihar, Navjeev Saxena, D. K. Paul May 2010

Effects Of Wall-Soil-Structure Interaction On Seismic Response Of Retaining Wall, Aditya Parihar, Navjeev Saxena, D. K. Paul

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

Retaining walls have suffered damages under past earthquakes. Usually the analyses do not consider the retained soil’s interaction with the wall, which takes place during dynamic conditions. The consideration makes the wall-soil system more flexible than the wall alone. The conditions of separation of wall (during interactions) again change the dynamic characteristics of the assumed wall-soil system that needs to be addressed. The paper presents a study on the behavior of the retaining wall under static as well as seismic conditions considering above aspects. The wall-soil interaction model incorporates the modeling of interface between them. The system is idealized ...


Numerical Simulation Of The Performance Of Cantilever Walls Subjected To Seismic Loading, Alberto Pettiti, Dominic Assimaki, Sebastiano Foti May 2010

Numerical Simulation Of The Performance Of Cantilever Walls Subjected To Seismic Loading, Alberto Pettiti, Dominic Assimaki, Sebastiano Foti

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

The design of flexible earth retaining structures against seismic loading is a challenging geotechnical problem, and it is typically conducted using pseudo-static approaches, which do not adequately represent the transient loading conditions of earthquake motions. Numerical analyses of designed walls with simplified material models showed high stresses in the structure when subjected to both dynamic and pseudo-static conditions, and a very large amount of reinforcement would be required to avoid the formation of plastic hinges. On the other hand, detailed simulations with inelastic material behaviour would yield more realistic estimations of the retaining structural response and improve the efficiency of ...


Seismic Analysis And Fragility Curves Of Gravity Waterfront Structures, Kalliopi Kakderi, Kyriazis Pitilakis May 2010

Seismic Analysis And Fragility Curves Of Gravity Waterfront Structures, Kalliopi Kakderi, Kyriazis Pitilakis

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

The aim of the study is to propose adequate fragility curves for waterfront/ retaining structures for ground shaking without the presence of liquefaction, using available data from past earthquakes’ damages in Europe and worldwide and numerical analysis of typical cases. Existing fragility curves and damage states are evaluated and their shortcomings and/or limitations are assessed. Typical waterfront structures, with different geometry, foundation soil conditions and seismic excitations, are studied using appropriate numerical modeling. The corresponding damage levels are estimated with respect to the induced residual displacements and the seismic response of the soil-structure system. Considering aleatory uncertainties of the ...


Seismic Analysis Of Retaining Wall Structures, Mohammadreza Abbasi Garavand, Alireza Saberi, Mona Salimi Ghezelbash May 2010

Seismic Analysis Of Retaining Wall Structures, Mohammadreza Abbasi Garavand, Alireza Saberi, Mona Salimi Ghezelbash

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

This paper describes 3-D finite element dynamic analysis of retaining wall structures with consideration of the soil-structure interaction. Purpose of this study is to reduce damages due to earthquake in such structures. For this reason, finite element program ANSYS has been used. The analysis data is based on 1995 Kobe earthquake report and the results have been verified with some retaining walls were damaged in that earthquake. To take into account the non-linearity of soil-structure surface, surface to surface contact element is used. One of the most important problems in dynamic analysis is modeling of infinite media. If hinge or ...


Seismic Fragility Analysis For Sheet Pile Wharves — Case Study Of The Hualien Harbor In Taiwan, Yung-Yen Ko, Ho-Hsiung Yang, Cheng-Hsing Chen May 2010

Seismic Fragility Analysis For Sheet Pile Wharves — Case Study Of The Hualien Harbor In Taiwan, Yung-Yen Ko, Ho-Hsiung Yang, Cheng-Hsing Chen

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

The seismic fragility curves represent the conditional probabilities that the structural damage meets or exceeds the specified damage states at various levels of the ground motion parameters, such as peak ground acceleration (PGA). In this study, the seismic fragility analysis for the sheet pile wharves of the Hualien Harbor in Taiwan was performed. The finite element analysis software PLAXIS was adopted for the nonlinear dynamic analysis. The time histories of several representative earthquake events that actually occurred in Taiwan, including the 1999 Chi-Chi Earthquake, were scaled to various PGA levels as the input motions. Then the seismic responses of the ...


Seismic Response Of Reinforced Soil Retaining Walls With Block Facings, Anitha Nelson, P. K. Jayasree May 2010

Seismic Response Of Reinforced Soil Retaining Walls With Block Facings, Anitha Nelson, P. K. Jayasree

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

Reinforced soil walls have become very popular in seismic areas owing to their flexible nature and cost effectiveness when compared to the conventional retaining structures. Although the use of reinforced soil walls with modular block facings and gabion facings is growing world wide at a rapid rate, the seismic response of these walls is yet to be analyzed. This paper discusses the response of these walls in terms of lateral facing deflection, reinforcement tensile force and crest surface settlement when subjected to seismic loading simulated by means of a variable amplitude harmonic vibration using the finite element analysis package, PLAXIS ...


Seismic Soil Pressures On Rigid Walls With Sloped Backfills, Guoxi Wu May 2010

Seismic Soil Pressures On Rigid Walls With Sloped Backfills, Guoxi Wu

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

Wood (1973) provided analytical solutions for the response of a rigid wall retaining elastic uniform soil backfill of finite length subjected to harmonic base excitation. Wu and Finn (1999) proposed a modified shear beam solution and derived closed-form formulations for computing dynamic soil pressures under harmonic loading. However, for rigid walls retaining sloped backfills, analytical solutions are not available for computing seismic soil pressures against the walls. In the current study, seismic soil pressures on rigid walls retaining 2H:1V (27°) sloped backfills have been computed using a total of eight acceleration time histories recorded in past large earthquakes. These ...


Seismic Lateral Earth Pressures On Retaining Structures, A. Murali Krishna May 2010

Seismic Lateral Earth Pressures On Retaining Structures, A. Murali Krishna

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

Various methods are available to estimate seismic earth pressures on soil retaining structures which cane be grouped to experimental, analytical and numerical methods. 1G model shaking table studies or high-g level centrifuge model shaking studies give some insight on the variation of seismic earth pressures along height of the retaining structure. In the simple analytical methods, M-O method based pseudo-static analysis is extensively used to evaluate seismic earth pressure variation and its probable resultant location. Pseudodynamic analysis method based analyses are also developed and are in progress for the same. Besides, these experimental and analytical methods, FEM or FDM based ...


A Comparison Of Local Site Conditions With Passive And Active Surface Wave Methods, Arif Mert Eker, Haluk Akgün, Mustafa Kerem Koçkar May 2010

A Comparison Of Local Site Conditions With Passive And Active Surface Wave Methods, Arif Mert Eker, Haluk Akgün, Mustafa Kerem Koçkar

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

This study encompasses dynamic soil characterization and seismic hazard mapping of the Plio-Quaternary and especially Quaternary alluvial sediments of the Çubuk district and its close vicinity that is situated towards the north of Ankara. The project site is located at a region which has a potential of being seriously affected by a possible earthquake occurring along the Çubuk Fault Zone that is thought to be a continuation of the Dodurga Fault Zone and a sub-fault belt of the North Anatolian Fault System that is one of the most prominent fault systems in Turkey with significant earthquake potential. Non-invasive seismic methods ...


An Upgrade Of The Microzonation Study Of The Centre Of Tirana City, Llambro Duni, Luljeta Bozo, Neki Kuka, Enkela Begu May 2010

An Upgrade Of The Microzonation Study Of The Centre Of Tirana City, Llambro Duni, Luljeta Bozo, Neki Kuka, Enkela Begu

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

An attempt was made in this paper to present an upgrade of the seismic microzonation of a part of the Tirana City. Some results of the previous, complete study performed in the late 80-s were used in this paper. The new aspect of this study is related to the probabilistic assessment of the ground motion parameters. Using gridded seismicity methodology, the PGA and the uniform response spectrum at the base rock corresponding to the 475-years return period were estimated. Based on them, five acceleration time histories are selected, which are later used to assess the response of the geotechnical models ...


Analysis Of Earthquake Site Response And Site Classification For Seismic Design Practices, Gloria M. Estrada May 2010

Analysis Of Earthquake Site Response And Site Classification For Seismic Design Practices, Gloria M. Estrada

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

In general, seismic provisions worldwide present different criteria for site classification, based on specific soil and rock properties, in order to determine representative design spectra for seismic design. On the other hand, results of site–specific analysis and seismic microzonation studies have shown not only the main properties of soil-rock profile that have marked influence on site response, but also site characteristics where it is necessary to carry out detailed and particular studies of earthquake ground response. This paper analyzes and compares site classification for seismic design of some seismic codes worldwide, with results of site-specific analysis and seismic microzonation ...


Characterization Of The Elastic Displacement Demand: Case Study - Sofia City, Ivanka Paskaleva, Mihaela Kouteva, Franco Vaccari, Giuliano F. Panza May 2010

Characterization Of The Elastic Displacement Demand: Case Study - Sofia City, Ivanka Paskaleva, Mihaela Kouteva, Franco Vaccari, Giuliano F. Panza

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

The results of the study on the seismic site response of a part of the metropolitan Sofia are discussed. The neo-deterministic seismic hazard assessment procedure has been used to compute realistic synthetic waveforms considering four earthquake scenarios, with magnitudes M=3.7, M=6.3 and M = 7.0. Source and site specific ground motion time histories are computed along three selected cross sections, making use of the hybrid approach, combining the modal summation technique and the finite differences scheme. Displacement and acceleration response spectra are considered. These results are validated against the design elastic displacement response spectra and displacement ...


Comparison Of Liquefaction Potential Evaluation Based On Different Field Tests, Syed M. Ali Jawaid May 2010

Comparison Of Liquefaction Potential Evaluation Based On Different Field Tests, Syed M. Ali Jawaid

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

The lowlands of India are vulnerable to possible future large earthquakes. The liquefaction strength is estimated using in-situ tests and the factor of safety against liquefaction by comparing the liquefaction strength with cyclic shear stress ratio developed in the deposit during an earthquake. Standard Penetration test (SPT) and Cone Penetration test(CPT) have been most commonly used in-situ tests for characterization of liquefaction resistance. In this study, liquefaction potential is evaluated based on SPT as well as CPT data obtained from the three different locations situated in alluvial lowlands. A large difference in factor of safety against liquefaction is found ...


Evaluating Seismicity Parameters Of Sanandaj, Iran Based On Instrumental Earthquakes, Kaveh Andisheh, Gholamreza Ghodrati Amiri, Motaza Taghizadeh May 2010

Evaluating Seismicity Parameters Of Sanandaj, Iran Based On Instrumental Earthquakes, Kaveh Andisheh, Gholamreza Ghodrati Amiri, Motaza Taghizadeh

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

The main goal of this paper is to evaluate the seismic parameters of Sanandaj, Iran. For this reason, at first, all the occurred instrumental earthquakes (1900-2006) in a radius of 200 km of Sanandaj city have been gathered. After elimination of the aftershocks and foreshocks, the main earthquakes were taken into consideration to calculate the seismic parameters by Gutenberg-Richter method, cumulative distribution functions, and Kijko-Sellevoll approach. This paper aims at estimation of seismicity parameters based on the seismic events and the relation between the cumulative frequency of earthquake occurrence and its magnitude. For this purpose the variable windows in time ...


Geotechnical And Seismic Risk Evaluation In Urban Areas, Piera Paola Capilleri, Michele Maugeri, Erminia Raciti May 2010

Geotechnical And Seismic Risk Evaluation In Urban Areas, Piera Paola Capilleri, Michele Maugeri, Erminia Raciti

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

Seismic and geotechnical hazard problems are widespread all over the world and they can cause natural disasters, damaging properties or causing human lives losses. Italian municipalities are not yet organised either to deal with the phenomena consequences, or to plan risk mitigation actions. A clear knowledge of the location and of the space and time evolution of the phenomena is needed for a vulnerability mitigation in the probably involved areas. Geo-hazard can be related with the consequences for exposed people and man made work by a microzonation. GIS technologies could play a crucial role in analysing large areas, but a ...


Geotechnical Preconditions For Skyscrapers Construction In Bulgaria And Seismic Risk Aspect, Chavdar V. Kolev, Martina G. Perikliyska May 2010

Geotechnical Preconditions For Skyscrapers Construction In Bulgaria And Seismic Risk Aspect, Chavdar V. Kolev, Martina G. Perikliyska

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

Parallel to the economic development of Bulgaria in the last nine – ten years there is a rapid raise in construction as well. This increase has been a good precondition for invest in some very high buildings with application of the newest technological achievements. These buildings are situated in the centrums of the largest Bulgarian cities: Sofia, Plovdiv, Varna and Bourgas. The Paper describes the geotechnical preconditions for construction of this type of buildings from seismic risk aspect. These preconditions are divided in four groups: geological, urban, technological and economical. The paper renders an account of the preconditions which are very ...


Gis-Based Identification Of Topographic Sites In Italy With Significant Ground Motion Amplification Effects, Vera Pessina, Emilia Fiorini, Roberto Paolucci May 2010

Gis-Based Identification Of Topographic Sites In Italy With Significant Ground Motion Amplification Effects, Vera Pessina, Emilia Fiorini, Roberto Paolucci

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

Surface topography can significantly affect earthquake ground motions, as suggested by many examples of unexpected damage suffered by buildings located on the top of hills, on ridges or along slopes. European and Italian seismic codes suggest topographic aggravation factors in the 1 – 1.4 range to be applied to seismic actions, depending not only on simple morphologic parameters (average slope angle, width and height of the relief) but also on the type of relief (isolated cliff or ridge) and on the location of the site relative to the relief. Furthermore, strongly irregular topographies should be dealt with by a specific ...


Preparation The Site Specific Spectrum For Civil Regions Of Zagross Mountains, Kaveh Andisheh, Seydeh Sara Hossini, Mortaza Taghizadeh May 2010

Preparation The Site Specific Spectrum For Civil Regions Of Zagross Mountains, Kaveh Andisheh, Seydeh Sara Hossini, Mortaza Taghizadeh

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

In this paper the site specific spectra for a region of the Zagros Mountains containing 5 cities in Kurdistan province of Iran is prepared. For this purpose, all the occurred earthquakes, containing both historical and instrumental events, in each 5 city have been gathered then main earthquakes was prepared by elimination the aftershocks, foreshocks, and the incorrect reported events from the data and main earthquakes were taken into consideration to calculate the seismic parameters by Kijko [2000] method considering uncertainty in magnitude and incomplete earthquake catalogue. All seismic sources of the region are modeled and recurrence relationship is established. After ...


The Meaning Of Eurocode 8 And Induced Seismicity For Earthquake Engineering In The Netherlands, J. W. R. Brouwer, T. Van Eck, F. H. Goutbeek, A. C. W. M. Vrouwenvelder May 2010

The Meaning Of Eurocode 8 And Induced Seismicity For Earthquake Engineering In The Netherlands, J. W. R. Brouwer, T. Van Eck, F. H. Goutbeek, A. C. W. M. Vrouwenvelder

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

The Netherlands is one of the few European countries where seismic loading is not a dominant part of the national codes. Only for very special structures, earthquakes are regarded as a separate loading case. Until now, Eurocode 8 (EC8) is not part of Dutch building laws nor is there an official Dutch translation. Tectonic seismicity mainly occurs in the southern part of The Netherlands. The Dutch code NEN 6702 has a zonation map which shows horizontal peak accelerations of 0.01g to 0.1g for a return period of 5000 years. However, this seismic zonation map is yet not coherent ...


Uniform Seismic Hazard Spectra Of Sanandaj, Iran, Kaveh Andisheh, Gholamreza Ghodrati Amiri, Seyed Ali Razavian Amrei May 2010

Uniform Seismic Hazard Spectra Of Sanandaj, Iran, Kaveh Andisheh, Gholamreza Ghodrati Amiri, Seyed Ali Razavian Amrei

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

This paper presents uniform seismic hazard spectra of Sanandaj city of Iran. Sanandaj is the administrative center of Kurdistan province, in which more than 500,000 people live in. A collected catalogue, containing both historical and instrumental events and covering the period from the 10th century BC to the year 2006, is used. Then seismic sources and The seismotectonic model of the considered region have been modeled within the radius of 200 km and recurrence relationship is established. After elimination of the aftershocks and foreshocks, the main earthquakes were taken into consideration to calculate the seismic parameters. For this purpose ...


Application Of High-Power Electrical Sparks For Dynamic Compaction Of Soil, Kh. A. Dzhantimirov, S. A. Rytov, S. A. Kryuchkov May 2010

Application Of High-Power Electrical Sparks For Dynamic Compaction Of Soil, Kh. A. Dzhantimirov, S. A. Rytov, S. A. Kryuchkov

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

The paper describes an electrical discharge technology, applied for soil compaction around a borehole, filled with hardening grout, in operations for erection of micropiles, cast piles, soil anchors and soil nails. The technology consists in that 150-250 microsecond long electrical sparks are generated with 6-second period in borehole. The sparks have 30-40 kJ energy, which is roughly of the same order of magnitude as a pile drop hammer. But a single electrical spark has 200-250 MW because of its short duration. Such pulses compact the contact layer of soil and thus increase bearing capacity of piles, anchors or soil nails ...