Blar i Norwegian Geotechnical Institute (NGI) Digital Archive på forfatter "Kaynia, Amir M."
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A new method for estimation of critical speed for railway tracks on soft ground
Norén-Cosgriff, Karin; Berggren, Eric Gustav; Kaynia, Amir M.; Dam, Niels Norman; Mortensen, Niels (Peer reviewed; Journal article, 2018)This paper presents a new method, ETL (EBER Track Lab), which allows for estimation of critical speed from measurements from a running train at normal speeds. Hence, large distances can be covered in short time. The method ... -
Advantages and limitation of using 2-D FE modelling for assessment of effect of mitigation measures for railway vibrations
Norén-Cosgriff, Karin; Bjørnarå, Tore Ingvald; Dahl, Birgitte Misund; Kaynia, Amir M. (Peer reviewed; Journal article, 2019)This paper addresses mitigation measures against railway vibrations in soft soils by use of FE calculations. In order for calculation models to be used as design tools, it is essential that they are relatively easy to set ... -
Behavior and Critical Failure Modes of Strip Foundations on Slopes under Seismic and Structural Loading
Raj, Dhiraj; Singh, Yogendra; Kaynia, Amir M. (Peer reviewed; Journal article, 2019)This paper presents a numerical study on capacity envelopes of strip foundations placed on the top and the face of two typical soil slopes at different offset distances and subjected to earthquake effects using the ... -
Behavior of slopes under multiple adjacent footings and buildings
Raj, Dhiraj; Singh, Yogendra; Kaynia, Amir M. (Peer reviewed; Journal article, 2018)This article examines the response of soil slopes under adjacent embedded strip foundations, subjected to increasing vertical load due to the gravity load of buildings. The study also considers slopes under closely spaced ... -
Centrifuge study of p-y curves for vertical-horizontal static loading of piles in sand
Kaynia, Amir M.; Zhang, Ga; Lu, Wenjun (Peer reviewed; Journal article, 2020)Pile foundations for offshore structures are subjected to vertical-horizontal load combinations. The current design method separately analyzes horizontal and vertical responses of piles without considerations of the combined ... -
Characteristics of cyclic undrained model SANISAND-MSu and their effects on response of monopiles for offshore wind structures
Liu, Haoyuan; Kaynia, Amir M. (Peer reviewed; Journal article, 2021) -
Dynamic Field Data from Offshore Monopile Wind Turbines - Assessment of Natural Frequencies and Damping
Norén-Cosgriff, Karin; Kaynia, Amir M. (Chapter, 2020) -
Dynamic properties of lightweight foamed glass and their effect on railway vibration
Lenart, Stanislav; Kaynia, Amir M. (Peer reviewed; Journal article, 2019)Deformation properties of lightweight coarse grained material from recycled foamed glass have been determined from large-scale triaxial tests on prismatic specimens with dimensions 40 cm × 40 cm × 80 cm. Deformations were ... -
Earthquake Geotechnics in Offshore Engineering
Kaynia, Amir M. (Chapter, 2018)This paper presents a number of geotechnical issues encountered in earthquake design of offshore structures and subsea facilities. Parallel with construction of traditional structures such as jackets and gravity-based ... -
Earthquake response of monopiles and caissons for Offshore Wind Turbines founded in liquefiable soil
Esfeh, Pourya Kazemi; Kaynia, Amir M. (Peer reviewed; Journal article, 2020)Monopile has been the most widespread foundation type for Offshore Wind Turbines (OWTs) in shallow waters. Caisson (skirted) foundations have also been evaluated in some projects as an economical alternative. While the ... -
Effect of foundation type and modelling on dynamic response and fatigue of offshore wind turbines
Løken, Ingrid Bye; Kaynia, Amir M. (Peer reviewed; Journal article, 2019)This paper presents dynamic response and fatigue analyses of several bottom-mounted offshore wind turbine (OWT) models, simulated in the aero-hydro-servo-elastic simulation tool FAST. The distinction between the models is ... -
Effect of foundation type and modelling on dynamic response and fatigue of offshore wind turbines
Løken, Ingrid Bye; Kaynia, Amir M. (Peer reviewed; Journal article, 2019)This paper presents dynamic response and fatigue analyses of several bottom‐mounted offshore wind turbine (OWT) models, simulated in the aero‐hydro‐servo‐elastic simulation tool FAST. The distinction between the models is ... -
Effect of kinematic interaction on seismic response of offshore wind turbines on monopiles
Kaynia, Amir M. (Peer reviewed; Journal article, 2020)Interest in renewable energy over the past decade has motivated a remarkable research on offshore wind energy. Due to the environmental loading conditions in the early developments of offshore wind farms, the focus of the ... -
Effect of track defects on vibration from high speed train
Kaynia, Amir M.; Park, Joonsang; Norén-Cosgriff, Karin (Peer reviewed; Journal article, 2017)The response of railway tracks and trackside vibration are strongly governed by the quality of the track. Defects or non-homogeneities in the track/substructure/ground can remarkably increase the responses in the system, ... -
Estimation of natural frequencies and damping using dynamic field data from an offshore wind turbine
Norén-Cosgriff, Karin; Kaynia, Amir M. (Peer reviewed; Journal article, 2020)The dynamic characteristics of offshore wind turbines are heavily affected by environmental loads from wave and wind action and nonlinear soil behaviour. In the design of the monopile structures, the fatigue load due to ... -
Evaluation of effect of confinement on the collapse probability of reinforced concrete frames subjected to earthquakes
Øystad-Larsen, Nina; Erduran, Emrah; Kaynia, Amir M. (Peer reviewed; Journal article, 2017)Confinement of reinforced concrete members has repeatedly proven crucial when structures are exposed to strong ground motions. Yet, unconfined concrete is still widely used in developing countries with significant seismic ... -
FE simulation of steady state wave motion in solids combined with a PML approach
Park, Joonsang; Kaynia, Amir M. (Peer reviewed; Journal article, 2017)This study presents a finite element (FE) framework for simulation of steady state wave motion, combined with a so-called PML approach. The steady state wave motion of current interest are not only time-harmonic load but ... -
Finite element analysis of failed slope by shear strength reduction technique: a case study for Surabhi Resort Landslide, Mussoorie township, Garhwal Himalaya
Gupta, Vikram; Bhasin, Rajinder Kumar; Kaynia, Amir M.; Chauhan, Vipin Kumar; Saini, A.S.; Tandon, R.S.; Pabst, Thomas (Journal article, 2015) -
Fragility Assessment of Transportation Infrastructure Systems Subjected to Earthquakes
Argyroudis, Sotiris; Mitoulis, Stergios; Kaynia, Amir M.; Winter, Mike G. (Chapter, 2018)This paper provides a review of the different methodologies for the fragility assessment of critical transportation infrastructure subjected to earthquake excitations with emphasis placed on geotechnical effects. Available ... -
Fragility of transport assets exposed to multiple hazards: State-of-the-art review toward infrastructural resilience
Argyroudis, Sotiris; Mitoulis, Stergios A.; Winter, Mike G.; Kaynia, Amir M. (Journal article; Peer reviewed, 2019)Vulnerability is a fundamental component of risk and its understanding is important for characterising the reliability of infrastructure assets and systems and for mitigating risks. The vulnerability analysis of infrastructure ...