Blar i NTNU Open på forfatter "Øiseth, Ole"
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Aerodynamic Stability of a Suspension Bridge with an Aluminum Girder - Wind Tunnel Testing and Numerical Predictions
Bang, Daniel; Ekern, Erlend (Master thesis, 2020)Verdens første hengebru med brukasse i aluminum vurderes konstruert for fjordkryssingen av Langenuen. Ved å bruke aluminumim istedenfor stål, oppstår det utfordringer blant annet med tanke på aerodynamisk stabilitet. Denne ... -
Aerodynamic Stability of a Suspension Bridge with an Aluminum Girder - Wind Tunnel Testing and Numerical Predictions
Ekern, Erlend; Bang, Daniel (Master thesis, 2020)Verdens første hengebru med brukasse i aluminum vurderes konstruert for fjordkryssingen av Langenuen. Ved å bruke aluminumim istedenfor stål, oppstår det utfordringer blant annet med tanke på aerodynamisk stabilitet. Denne ... -
ALE-VMS methods for wind-resistant design of long-span bridges
Helgedagsrud, Tore Andreas; Bazilevs, Yuri; Mathisen, Kjell Magne; Øiseth, Ole (Peer reviewed; Journal article, 2019)For unsteady aerodynamics, the Arbitrary Lagrangian-Eulerian Variational Multi-Scale (ALE-VMS) formulation for incompressible flows has proven an accurate and powerful method. In this paper we present an overview of some ... -
An enhanced forced vibration rig for wind tunnel testing of bridge deck section models in arbitrary motion
Siedziako, Bartosz; Øiseth, Ole; Rønnquist, Anders (Journal article, 2017)This paper presents a new experimental setup for the aerodynamic section model testing of bridge decks. The rig is designed to move a section model in arbitrary motion in a wind tunnel to imitate the motions of such scaled ... -
An enhanced identification procedure to determine the rational functions and aerodynamic derivatives of bridge decks
Siedziako, Bartosz; Øiseth, Ole (Journal article, 2018)Development of time-efficient and reliable methods for estimating the aeroelastic properties of bridge decks is of major importance for bridge engineers to make wind tunnel testing more productive and less expensive. This ... -
Code-to-Code Verification of End-Anchored Floating Bridge Global Analysis
Viuff, Thomas; Xiang, Xu; Leira, Bernt Johan; Øiseth, Ole (Chapter, 2018)A code-to-code comparison of the dynamic characteristics of an end-anchored floating pontoon bridge is presented for two commercial software commonly used in the offshore industry, i.e. SIMO-RIFLEX and ORCAFLEX. Furthermore, ... -
Computational and experimental investigation of free vibration and flutter of bridge decks
Helgedagsrud, Tore Andreas; Bazilevs, Yuri; Mathisen, Kjell Magne; Øiseth, Ole (Journal article; Peer reviewed, 2018)A modified rigid-object formulation is developed, and employed as part of the fluid–object interaction modeling framework from Akkerman et al. (J Appl Mech 79(1):010905, 2012. https://doi.org/10.1115/1.4005072) to simulate ... -
Covariance-driven stochastic subspace identification of an end-supported pontoon bridge under varying environmental conditions
Kvåle, Knut Andreas; Øiseth, Ole; Rønnquist, Anders (Journal article, 2017)The Bergsøysund Bridge is currently being extensively monitored with accelerometers, anemometers, wave radars and GNSS sensors. By applying Covariance-driven Stochastic Subspace Identification (Cov-SSI), the modal parameters ... -
Dynamic behaviour of existing and new railway catenary systems under Norwegian conditions
Nåvik, Petter Røe (Doctoral theses at NTNU;2016:298, Doctoral thesis, 2016)This thesis concerns the dynamic behaviour of railway catenary systems, particularly Norwegian systems. The aim of this PhD study is to increase the knowledge of the dynamic behaviour of these systems. This includes analyses ... -
Dynamic Response of a Floating Bridge Structure
Viuff, Thomas; Leira, Bernt Johan; Øiseth, Ole; Xiang, Xu (Chapter; Peer reviewed, 2016)A theoretical overview of the stochastic dynamic analysis of a floating bridge structure is presented. Emphasis is on the wave-induced response and the waves on the sea surface are idealized as a zero mean stationary ... -
Effects of wave directionality on extreme response for a long end-anchored floating bridge
Viuff, Thomas; Leira, Bernt Johan; Xiang, Xu; Øiseth, Ole (Journal article; Peer reviewed, 2019)Reliable design codes are of great importance when constructing new civil engineering concepts such as floating bridges. Previously only a scarce number of floating bridges have been built in rough wave conditions and ... -
Efficient computation of cross-spectral densities in the stochastic modelling of waves and wave loads
Giske, Finn-Idar Grøtta; Leira, Bernt Johan; Øiseth, Ole (Journal article; Peer reviewed, 2017)A new method is presented for efficient calculation of auto- and cross-spectral densities in the stochastic modelling of ocean waves and wave loads. As part of the short-term response analyses, the method may contribute ... -
Estimation of the dynamic response of a slender suspension bridge using measured acceleration data
Petersen, Øyvind Wiig; Øiseth, Ole; Lourens, Eliz-Mari (Journal article; Peer reviewed, 2017)Suspension bridges with very long spans and slender designs are susceptible to large-amplitude dynamic excitation. Monitoring systems installed on bridges can provide measurement data (e.g. accelerations) and therewith ... -
Estimation of the full-field dynamic response of a floating bridge using Kalman-type filtering algorithms
Petersen, Øyvind Wiig; Øiseth, Ole; Nord, Torodd Skjerve; Lourens, Eliz-Mari (Journal article; Peer reviewed, 2018)Numerical predictions of the dynamic response of complex structures are often uncertain due to uncertainties inherited from the assumed load effects. Inverse methods can estimate the true dynamic response of a structure ... -
Evaluation of mast measurements and wind tunnel terrain models to describe spatially variable wind field characteristics for long-span bridge design
Lystad, Tor Martin; Fenerci, Aksel; Øiseth, Ole (Journal article; Peer reviewed, 2018)The quality of the information about the wind field characteristics is crucial for accurately predicting the structural response of a long-span bridge subjected to dynamic wind loads. In this paper, in situ mast measurements ... -
Experiences from the five-year monitoring of a long-span pontoon bridge: What went right, what went wrong and what?s next?
Kvåle, Knut Andreas; Øiseth, Ole; Rønnquist, Anders (Journal article; Peer reviewed, 2019)The Bergsøysund Bridge is a 930-metre-long end-supported pontoon bridge located in Norway, and has been the target of a five-year-long, extensive monitoring program. Herein, we will describe the unique structural characteristics ... -
Flutter Analysis of Twin-Deck Configurations for a Suspension Bridge Crossing the Sulafjord
Sivertsen, Eva Anita; Strehl, Henriette Sofie Høgstedt (Master thesis, 2021)Prosjektet "Ferjefri E39" inkluderer et forslag om å krysse Sulafjorden med en hengebro med dobbelt-kassetverrsnitt. Den dype fjorden som omgis av et komplekst terreng er opphavet for behovet om et enkelt spenn på 2800 m. ... -
Flutter Analysis of Twin-Deck Configurations for a Suspension Bridge Crossing the Sulafjord
Sivertsen, Eva Anita; Strehl, Henriette Sofie Høgstedt (Master thesis, 2021)Prosjektet "Ferjefri E39" inkluderer et forslag om å krysse Sulafjorden med en hengebro med dobbelt-kassetverrsnitt. Den dype fjorden som omgis av et komplekst terreng er opphavet for behovet om et enkelt spenn på 2800 m. ... -
Flutter derivatives from free decay tests of a rectangular B/D?=?10 section estimated by optimized system identification methods
Andersen, Michael Styrk; Øiseth, Ole; Johansson, Jens; Brandt, Anders (Journal article; Peer reviewed, 2018) -
Full long-term extreme response analysis of marine structures using inverse FORM
Giske, Finn-Idar Grøtta; Leira, Bernt Johan; Øiseth, Ole (Journal article; Peer reviewed, 2017)An exact and an approximate formulation for the long-term extreme response of marine structures are discussed and compared. It is well known that the approximate formulation can be evaluated in a simplified way by using ...