2021 |
Ansari Y, Kouretzis G, Sloan SW, 'Physical modelling of lateral sand-pipe interaction', Geotechnique, 71 60-75 (2021)
© 2019 This paper presents a series of physical modelling tests performed to measure the resistance developing during lateral dragging of a rigid pipe buried in loose to very den... [more]
© 2019 This paper presents a series of physical modelling tests performed to measure the resistance developing during lateral dragging of a rigid pipe buried in loose to very dense dry sand. The experiments were performed in a small-scale prototype developed to model sand-pipe interaction during relative ground movement episodes while accurately controlling the density and uniformity of sand around the pipe. Digital imaging and particle image velocimetry equipment are integrated with the rig, so as to track the evolution of the failure surface developing in sand with increasing pipe displacements. Auxiliary components of the rig allow investigation of the effects of pipe kinematic constraints and embedment method on the results obtained. Accordingly, the measurements obtained with the developed prototype are compared against results from similar studies, with the intention of shedding some light on the scatter observed in published data, and on the provisions from different pipe stress analysis guidelines. It is shown that current simplified methods may underestimate the lateral reaction developing on pipes in very dense sand beds, and analysis models built around these methods may under-predict pipe strains. To alleviate this, a modified expression is proposed for estimating the peak reaction of lateral elastoplastic soil springs, and an upper bound of this reaction is provided for design purposes.
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2020 |
Zheng C, Gan S, Kouretzis G, Luan L, Ding X, 'Dynamic analysis of an axially loaded pile embedded in elastic-poroelasitc layered soil of finite thickness', International Journal for Numerical and Analytical Methods in Geomechanics, 44 533-549 (2020) [C1]
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2020 |
Wu J, Kouretzis G, Suwal L, Ansari Y, Sloan SW, 'Shallow and deep failure mechanisms during uplift and lateral dragging of buried pipes in sand', Canadian Geotechnical Journal, 57 1472-1483 (2020) [C1]
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2020 |
Luan L, Zheng C, Kouretzis G, Ding X, 'Dynamic analysis of pile groups subjected to horizontal loads considering coupled pile-to-pile interaction', Computers and Geotechnics, 117 (2020) [C1]
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2020 |
Luan L, Ding X, Zheng C, Kouretzis G, Wu Q, 'Dynamic response of pile groups subjected to horizontal loads', Canadian Geotechnical Journal, 57 469-481 (2020) [C1]
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2020 |
Luan L, Zheng C, Kouretzis G, Ding X, Poulos H, 'A new dynamic interaction factor for the analysis of pile groups subjected to vertical dynamic loads', Acta Geotechnica, 15 3545-3558 (2020) [C1]
© 2020, Springer-Verlag GmbH Germany, part of Springer Nature. ¿his paper presents an analytical method for calculating the steady-state impedance factors of pile groups of arbitr... [more]
© 2020, Springer-Verlag GmbH Germany, part of Springer Nature. ¿his paper presents an analytical method for calculating the steady-state impedance factors of pile groups of arbitrary configuration subjected to harmonic vertical loads. The derived solution allows considering the effect of the actual pile geometry on the contribution of pile-soil-pile interaction to the response of the group, via the introduction of a new dynamic interaction factor, defined on the basis of soil resistance instead of pile displacements. The solution is first validated against a published solution for single piles that accounts for the effect of pile geometry on the generated ground vibrations. Accordingly, we show that the derived soil attenuation factor agrees well with existing solutions for pile groups in the high frequency range, but considerable differences are observed in both the stiffness and damping components of the computed impedance when the relative spacing between piles decreases. Numerical results obtained for typical problem parameters suggest that ignoring pile geometry effects while estimating the contribution of pile-soil-pile interaction in the response may lead to inaccurate results, even for relative large pile group spacings.
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2020 |
Zheng C, Cai Y, Luan L, Kouretzis G, Ding X, 'Horizontal vibration of a rigid strip footing on viscoelastic half-space', INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS, 45 325-335 (2020)
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2020 |
Wang K, Zhuang Y, Kouretzis G, Sloan SW, 'Shakedown analysis of ballasted track structure using three-dimensional finite element techniques', Acta Geotechnica, 15 1231-1241 (2020) [C1]
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2020 |
Gan S, Zheng C, Kouretzis G, Ding X, 'Vertical vibration of piles in viscoelastic non-uniform soil overlying a rigid base', Acta Geotechnica, 15 1321-1330 (2020) [C1]
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2020 |
Zheng C, Gan S, Kouretzis G, Ding X, Luan L, 'Vertical vibration of a large diameter pile partially-embedded in poroelastic soil', Soil Dynamics and Earthquake Engineering, 139 (2020) [C1]
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2020 |
Zheng C, Kouretzis G, Luan L, Ding X, 'Kinematic response of pipe piles subjected to vertically propagating seismic P-waves', ACTA GEOTECHNICA, (2020)
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2020 |
Zheng C, Luan L, Kouretzis G, Ding X, 'Vertical vibration of a rigid strip footing on viscoelastic half-space', International Journal for Numerical and Analytical Methods in Geomechanics, 44 1983-1995 (2020) [C1]
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2019 |
Dehghanpoor A, Thambiratnam D, Chan T, Taciroglu E, Kouretzis G, Li Z, 'Coupled Horizontal and Vertical Component Analysis of Strong Ground Motions for Soil-Pile-Superstructure Systems: Application to a Bridge Pier with Soil-Structure Interaction', JOURNAL OF EARTHQUAKE ENGINEERING, (2019)
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2019 |
Salimi Eshkevari S, Abbo AJ, Kouretzis G, 'Bearing capacity of strip footings on layered sands', Computers and Geotechnics, 114 (2019) [C1]
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2019 |
Luan L, Zheng C, Kouretzis G, 'Simplified three-dimensional analysis of horizontally vibrating floating and fixed-end pile groups', INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS, 43 2585-2596 (2019) [C1]
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2019 |
Eshkevari SS, Abbo AJ, Kouretzis G, 'Bearing capacity of strip footings on sand over clay', CANADIAN GEOTECHNICAL JOURNAL, 56 699-709 (2019) [C1]
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2019 |
Zheng C, He R, Kouretzis G, Ding X, 'Horizontal vibration of a cylindrical rigid foundation embedded in poroelastic half-space', Computers and Geotechnics, 106 296-303 (2019) [C1]
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2019 |
Lester AM, Kouretzis GP, Sloan SW, 'Finite element modelling of prefabricated vertical drains using 1D drainage elements with attached smear zones', Computers and Geotechnics, 107 235-254 (2019) [C1]
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2019 |
Luan L, Zheng C, Kouretzis G, Cao G, Zhou H, 'Development of a three-dimensional soil model for the dynamic analysis of end-bearing pile groups subjected to vertical loads', INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS, 43 1784-1793 (2019) [C1]
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2019 |
Zhao Z, Kouretzis G, Sloan SW, Gao Y, 'Effect of geometric nonlinearity on the ultimate lateral resistance of piles in clay', Computers and Geotechnics, 105 110-115 (2019) [C1]
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2018 |
Zheng C, Ding X, Kouretzis G, Liu H, Sun Y, 'Three-dimensional propagation of waves in piles during low-strain integrity tests', GEOTECHNIQUE, 68 358-363 (2018) [C1]
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2018 |
Kelly RB, Sloan SW, Pineda JA, Kouretzis G, Huang J, 'Outcomes of the Newcastle symposium for the prediction of embankment behaviour on soft soil', Computers and Geotechnics, 93 9-41 (2018) [C1]
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2018 |
Ansari Y, Kouretzis G, Sloan SW, 'Development of a prototype for modelling soil-pipe interaction and its application for predicting uplift resistance to buried pipe movements in sand', CANADIAN GEOTECHNICAL JOURNAL, 55 1451-1474 (2018) [C1]
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2017 |
Ding X, Zheng C, Liu H, Kouretzis G, 'Resistance of inner soil to the horizontal vibration of pipe piles', Journal of Engineering Mechanics, 143 (2017) [C1]
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2017 |
Zheng C, Liu H, Ding X, Kouretzis G, 'Resistance of inner soil to the vertical vibration of pipe piles', SOIL DYNAMICS AND EARTHQUAKE ENGINEERING, 94 83-87 (2017) [C1]
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2017 |
Kouretzis G, Pineda J, Krabbenhøft K, Wilson L, 'Interpretation of vane shear tests for geotechnical stability calculations', Canadian Geotechnical Journal, 54 1775-1780 (2017) [C1]
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2017 |
Zhao Z, Kouretzis G, Sloan S, Gao Y, 'Ultimate lateral resistance of tripod pile foundation in clay', Computers and Geotechnics, 92 220-228 (2017) [C1]
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2017 |
Zheng C, Liu H, Ding X, Kouretzis GP, Sloan SW, Poulos HG, 'Non-axisymmetric response of piles in low-strain integrity testing', GEOTECHNIQUE, 67 181-186 (2017) [C1]
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2016 |
Kouretzis GP, Gourvenec SM, 'Editorial: Recent developments in pipeline geotechnics', CANADIAN GEOTECHNICAL JOURNAL, 53 V-V (2016)
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2016 |
Liu H, Zheng C, Ding X, Kouretzis GP, Sloan SW, 'A revised solution for the horizontal vibration of an end-bearing pile in viscoelastic soil', INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS, 40 1890-1900 (2016) [C1]
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2016 |
Zheng C, Kouretzis GP, Ding X, Liu H, Poulos HG, 'Three-dimensional effects in low-strain integrity testing of piles: analytical solution', CANADIAN GEOTECHNICAL JOURNAL, 53 225-235 (2016) [C1]
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2016 |
Zheng C, Liu H, Ding X, Kouretzis GP, Sheng D, 'Three-Dimensional Effects in Low-Strain Integrity Testing of Large Diameter Pipe Piles', JOURNAL OF ENGINEERING MECHANICS, 142 (2016) [C1]
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2015 |
Kouretzis GP, Karamitros DK, Sloan SW, 'Analysis of buried pipelines subjected to ground surface settlement and heave', CANADIAN GEOTECHNICAL JOURNAL, 52 1058-1071 (2015) [C1]
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2015 |
Zheng C, Liu H, Kouretzis GP, Sloan SW, Ding X, 'Vertical response of a thin-walled pipe pile embedded in viscoelastic soil to a transient point load with application to low-strain integrity testing', Computers and Geotechnics, 70 50-59 (2015) [C1]
© 2015 Elsevier Ltd. This paper presents an analytical method to compute the dynamic response of a thin-walled pipe pile due to a vertical transient point load acting on its head.... [more]
© 2015 Elsevier Ltd. This paper presents an analytical method to compute the dynamic response of a thin-walled pipe pile due to a vertical transient point load acting on its head. Inspired from challenges faced during the interpretation of low-strain integrity tests on pipe piles, the proposed method moves beyond the widely used one-dimensional wave theory to consider the asymmetric nature of the problem, and stress wave propagation along both the vertical and circumferential directions. Coupling of pipe pile-viscoelastic soil vibration is considered via modeling the outer and inner soil as a series of infinitesimally thin layers in perfect contact with the pile, and their low-strain properties are directly introduced in the solution. The methodology is validated against numerical results, before discussing the mechanisms governing the dynamic response of the pipe pile-soil system to the impact load, with emphasis on the vertical velocity measured at a hypothetical receiver placed on the pile head. Additional results from a parametric analysis are used to provide insights on the accurate estimation of the arrival time of the receiving wave, and the optimal location of the receiver.
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2015 |
Kouretzis GP, Ansari Y, Pineda J, Kelly R, Sheng D, 'Numerical evaluation of clay disturbance during blade penetration in the flat dilatometer test', Géotechnique Letters, 5 91-95 (2015)
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2015 |
Zhang X, Sheng D, Kouretzis GP, Krabbenhoft K, Sloan SW, 'Numerical investigation of the cylinder movement in granular matter', Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 91 (2015) [C1]
© 2015 American Physical Society. We investigate numerically the mechanisms governing horizontal dragging of a rigid cylinder buried inside granular matter, with particular emphas... [more]
© 2015 American Physical Society. We investigate numerically the mechanisms governing horizontal dragging of a rigid cylinder buried inside granular matter, with particular emphasis on enumerating drag and lift forces that resist cylinder movement. The recently proposed particle finite element method is employed, which combines the robustness of classical continuum mechanics formulations in terms of representing complex aspects of the material constitutive behavior, with the effectiveness of discrete element methods in simulating ultralarge deformation problems. The investigation focuses on the effect of embedment depth, cylinder roughness, granular matter macromechanical properties, and of the magnitude of the cylinder's horizontal displacement on the amplitude of the resisting forces, which are discussed in light of published experimental data. Interpretation of the results provides insight on how the material flow around the cylinder affects the developing resistance, and a mechanism is proposed to describe the development of a steady-state drag force at large horizontal movements of the cylinder.
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2015 |
Kouretzis GP, Ansari Y, Pineda J, Kelly R, Sheng D, 'Numerical evaluation of clay disturbance during blade penetration in the flat dilatometer test', Geotechnique Letters, 5 91-95 (2015) [C1]
This paper presents a study on the amplification of horizontal soil stresses during flat dilatometer test (DMT) blade penetration based on three-dimensional total and effective st... [more]
This paper presents a study on the amplification of horizontal soil stresses during flat dilatometer test (DMT) blade penetration based on three-dimensional total and effective stress numerical analyses, while considering stress-flow coupling and large deformations. The focus here is on saturated clays, and the effect of soil stress history on the horizontal stress index is discussed in detail. The obtained results appear to be in good agreement with published and new field data, leading to the proposal of two new expressions for estimating the overconsolidation ratio and the earth pressure coefficient at rest directly from flat dilatometer tests in estuarine clays.
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2015 |
Zheng C, Kouretzis GP, Sloan SW, Liu H, Ding X, 'Vertical vibration of an elastic pile embedded in poroelastic soil', Soil Dynamics and Earthquake Engineering, 77 177-181 (2015) [C1]
© 2015 Elsevier Ltd. We present an analytical study on the vertical vibration of an elastic pile embedded in poroelastic soil. The poroelastic soil is divided into a homogeneous h... [more]
© 2015 Elsevier Ltd. We present an analytical study on the vertical vibration of an elastic pile embedded in poroelastic soil. The poroelastic soil is divided into a homogeneous half-space underlying the pile base and a series of infinitesimally thin independent layers along its shaft. The dynamic interaction problem is solved by extending a method originally proposed for an embedded rigid foundation. The validity of the derived solution is verified via comparison with existing solutions. Arithmetical examples are used to demonstrate the sensitivity of the vertical pile impedance to the relative rigidity of the two soil parts.
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2014 |
Kouretzis GP, Krabbenhøft K, Sheng D, Sloan SW, 'Soil-buried pipeline interaction for vertical downwards relative offset', Canadian Geotechnical Journal, 51 1087-1094 (2014) [C1]
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2014 |
Kouretzis GP, Andrianopoulos KI, Sloan SW, Carter JP, 'Analysis of circular tunnels due to seismic P-wave propagation, with emphasis on unreinforced concrete liners', COMPUTERS AND GEOTECHNICS, 55 187-194 (2014) [C1]
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2014 |
Ansari Y, Kouretzis GP, Sheng D, 'An effective stress analysis of partially embedded offshore pipelines: Vertical penetration and axial walking', COMPUTERS AND GEOTECHNICS, 58 69-80 (2014) [C1]
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2014 |
Kouretzis GP, Sheng D, Wang D, 'Numerical simulation of cone penetration testing using a new critical state constitutive model for sand', Computers and Geotechnics, 56 50-60 (2014) [C1]
A new perspective on the numerical simulation of cone penetration in sand is presented, based on an enhanced critical state model implemented in an explicit-integration finite ele... [more]
A new perspective on the numerical simulation of cone penetration in sand is presented, based on an enhanced critical state model implemented in an explicit-integration finite element code. Its main advantage, compared to similar studies employing simpler soil models, is that sand compressibility can be described with a single set of model parameters, irrespective of the stress level and the sand relative density. Calibration is based on back-analysis of published centrifuge experiments, while results of the methodology are also compared against independent tests. Additional analyses are performed to investigate sand state effects on cone penetration resistance, in comparison with empirical expressions from the literature. © 2013 Elsevier Ltd.
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2014 |
Hambleton JP, Kouretzis GP, Sloan SW, 'Introduction to the CGSE Special Issue of Australian Geomechanics', Australian Geomechanics, 49 1-2 (2014) [C3]
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2014 |
Kouretzis GP, Sheng D, Wang D, 'Numerical simulation of CPT cone penetration in sand', Applied Mechanics and Materials, 553 416-421 (2014) [C1]
Numerical simulation of cone penetration in sand is performed by means of a computationally efficient critical state model implemented in an explicit-integration finite element co... [more]
Numerical simulation of cone penetration in sand is performed by means of a computationally efficient critical state model implemented in an explicit-integration finite element code. Its main advantage, compared to other published studies employing simpler soil models such as the Drucker-Prager, is that sand compressibility can be described with a single set of model parameters, irrespective of the stress level and the sand relative density. Calibration of the constitutive model is based on back-analysis of published centrifuge tests results, and consequently the predictions of the numerical methodology are compared against independent tests. Additional analyses are performed for proposing a new simplified formula to correlate the cone penetration resistance with the in situ sand relative density. © (2014) Trans Tech Publications, Switzerland.
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2014 |
Kouretzis G, Ansari Y, Pineda J, Sheng D, 'Experimental and numerical investigation of rate and softening effects on the undrained shear strength of Ballina clay', Australian Geomechanics Journal, 49 51-57 (2014) [C1]
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2013 |
Kouretzis GP, Sheng D, Sloan SW, 'Sand-pipeline-trench lateral interaction effects for shallow buried pipelines', Computers and Geotechnics, 54 53-59 (2013) [C1]
A large-deformation numerical methodology is applied to simulate the interaction effects for a pipeline installed in a trench backfilled with loosely deposited dry sand, focusing ... [more]
A large-deformation numerical methodology is applied to simulate the interaction effects for a pipeline installed in a trench backfilled with loosely deposited dry sand, focusing on shallow buried pipelines subjected to lateral displacements relative to the surrounding soil. Based on the backfill-pipeline deformation mode under shallow embedment conditions, described in previous experimental studies, analyses are performed while considering only the critical state shear strength parameters of the backfill. The numerical methodology is validated against experimental full-scale test measurements from the literature, for pipelines buried in uniform dry loose and medium sand. Parametric analyses are performed to generate approximate formulas and charts for calculating (i) the maximum force on the pipeline and (ii) the minimum trench dimensions to eliminate interaction with the surrounding natural ground. Application of the proposed approach in the prediction of independent full-scale test results for a pipeline embedded in a shallow trench demonstrates its effectiveness, and underlines the effect of trench dimensioning on the response of the pipeline. © 2013 Elsevier Ltd.
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2013 |
Kouretzis GP, Sloan SW, Carter JP, 'Effect of interface friction on tunnel liner internal forces due to seismic S- and P-wave propagation', SOIL DYNAMICS AND EARTHQUAKE ENGINEERING, 46 41-51 (2013) [C1]
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2011 |
Karamitros DK, Bouckovalas GD, Kouretzis G, Gkesouli V, 'An analytical method for the strength verification of buried steel pipelines at normal fault crossings', Soil Dynamics and Earthquake Engineering, 31 1452-1464 (2011) [C1]
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2011 |
Kouretzis G, Bouckovalas GD, Karamitros DK, 'Seismic verification of long cylindrical underground structures considering Rayleigh wave effects', Tunnelling and Underground Space Technology, 26 789-794 (2011) [C1]
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2007 |
Kouretzis GP, Bouckovalas GD, Gantes CJ, 'Analytical calculation of blast-induced strains to buried pipelines', INTERNATIONAL JOURNAL OF IMPACT ENGINEERING, 34 1683-1704 (2007) [C1]
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2007 |
Karamitros DK, Bouckovalas GD, Kouretzis GP, 'Stress analysis of buried steel pipelines at strike-slip fault crossings', SOIL DYNAMICS AND EARTHQUAKE ENGINEERING, 27 200-211 (2007) [C1]
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2006 |
Kouretzis GP, Bouckovalas GD, Gantes CJ, '3-D shell analysis of cylindrical underground structures under seismic shear (S) wave action', SOIL DYNAMICS AND EARTHQUAKE ENGINEERING, 26 909-921 (2006) [C1]
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2002 |
Bouckovalas GD, Kouretzis GP, Kalogeras IS, 'Site-specific analysis of strong motion data from the September 7, 1999 Athens, Greece earthquake', NATURAL HAZARDS, 27 105-131 (2002) [C1]
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2001 |
Bouckovalas GD, Kouretzis GP, 'Stiff soil amplification effects in the 7 September 1999 Athens (Greece) earthquake', SOIL DYNAMICS AND EARTHQUAKE ENGINEERING, 21 671-687 (2001) [C1]
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