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Browsing NTNU Open by Author "Rønnquist, Anders"

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    • 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 ...
    • Assessment of the High-frequency Response in Railway Pantograph-Catenary Interaction Based on Numerical Simulation 

      Song, Yang; Rønnquist, Anders; Nåvik, Petter Juell (Peer reviewed; Journal article, 2020)
      The numerical model is a well-acknowledged tool to evaluate railway pantograph-catenary interaction performance. The current standard restricts most current simulation tools by a cut-off frequency of 20 Hz. This low-frequency ...
    • Conceptual form-finding in structural engineering 

      Luczkowski, Marcin (Doctoral theses at NTNU;2020:232, Doctoral thesis, 2020)
      The building industry is a growing industry, and it is expected to be expanding further in the near future. In the design, production and construction of new projects, the conceptual design is clearly the most creative ...
    • 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 ...
    • Damage Detection Applied to a Full-Scale Steel Bridge Using Temporal Momens 

      Svendsen, Bjørn Thomas; Frøseth, Gunnstein Thomas; Rønnquist, Anders (Peer reviewed; Journal article, 2020)
      The most common damages in existing highway and railway steel bridges are related to fatigue and are, as reported in the literature, found in the structural system of the bridge deck. This paper proposes a methodology for ...
    • Damping in Timber Structures 

      Labonnote, Nathalie (Doctoral Theses at NTNU, 1503-8181; 2012:263, Doctoral thesis, 2012)
      Key point to development of environmentally friendly timber structures, appropriate to urban ways of living, is the development of high-rise timber buildings. Comfort properties are nowadays one of the main limitations to ...
    • Development of an index for quantification of structural dynamic response in a railway catenary section 

      Nåvik, Petter Juell; Derosa, Stefano; Rønnquist, Anders (Peer reviewed; Journal article, 2020)
      In an attempt to quantify the amount of the dynamic reaction in a railway catenary system due to the dynamic action created by the interaction with the pantograph of the train, a catenary dynamic index (CDI) is developed. ...
    • 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 comparison of a railway catenary section upgrade by field measurement assessments 

      Nåvik, Petter Røe; Rønnquist, Anders (Journal article; Peer reviewed, 2017)
      The pantograph-catenary interaction is crucial for running trains on electrical railway lines. The coupled dynamic problem of an in space stationary system, the catenary system, and a system in motion, the pantograph, is ...
    • Dynamic optimization of railway catenary system by turning unwanted lumped-mass into tuned-mass 

      zhendong, liu; Stichel, Sebastian; Rønnquist, Anders (Chapter, 2017)
      The railway catenary is suspended to its supports with droppers, clamps and oth-er fittings. These lumped-masses are made light and small to minimize disturbances. The mass-es cannot be completely removed but can be adjusted ...
    • Evolution of load conditions in the Norwegian railway network and imprecision of historic railway load data 

      Frøseth, Gunnstein Thomas; Rønnquist, Anders (Journal article; Peer reviewed, 2018)
      This article describes historic load conditions in the Norwegian railway network to improve estimates of the remaining service life of bridges. Data on rolling stock, traffic and infrastructure throughout the history of ...
    • 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 ...
    • Global Buckling Reliability Analysis of Slender Network Arch Bridges: An Application of Monte Carlo-Based Estimation by Optimized Fitting 

      Rønnquist, Anders; Næss, Arvid (Chapter, 2017)
      Network arch bridges are extremely slender bridge structures with a very efficient 16 load-carrying structure. This configuration can carry loads that are several times greater 17 than traditional tied-arch bridges with ...
    • A heuristic wear model for the contact strip and contact wire in pantograph – Catenary interaction for railway operations under 15 kV 16.67 Hz AC systems 

      Derosa, Stefano; Nåvik, Petter Juell; Collina, Andrea; Bucca, Giuseppe; Rønnquist, Anders (Peer reviewed; Journal article, 2020)
      The sliding contact between the pantograph and catenary allows the correct operation of electric trains. However, this contact induces wear on both the components involved in the process, namely the contact strip on the ...
    • Indirect monitoring of vortex-induced vibration of suspension bridge hangers 

      Cantero, Daniel; Øiseth, Ole; Rønnquist, Anders (Journal article; Peer reviewed, 2017)
      Wind loading of large suspension bridges produces a variety of structural responses, including the vortex-induced vibrations of the hangers. Because it is impractical to monitor each hanger, this study explores the possibility ...
    • Influence line extraction by deconvolution in the frequency domain 

      Frøseth, Gunnstein Thomas; Rønnquist, Anders; Cantero, Daniel; Øiseth, Ole (Journal article; Peer reviewed, 2017)
      This paper proposes a new method for extracting static influence lines from measurements on bridges. The response of a structure is the convolution of the load and the influence line. Previous research has not embraced the ...
    • Long-term monitoring of wind field characteristics and dynamic response of a long-span suspension bridge in complex terrain 

      Fenerci, Aksel; Øiseth, Ole; Rønnquist, Anders (Journal article; Peer reviewed, 2017)
      Long-term monitoring data of wind velocities and accelerations on the Hardanger Bridge are used to investigate the relationship between the wind-loading and response processes. The extensive measurement system consisting ...
    • Numerical Evaluation of Modal Properties Change of Railway Bridges during Train Passage 

      Cantero, Daniel; Rønnquist, Anders (Journal article; Peer reviewed, 2017)
      During the passage of vehicles over a bridge, both systems (vehicle and bridge) are coupled together. This coupling is generally accounted for in vehicle-bridge interaction analyses. It is also commonly acknowledged that ...
    • On the use of experimental modal analysis for system identification of a railway pantograph 

      Nåvik, Petter Juell; Derosa, Stefano; Rønnquist, Anders (Peer reviewed; Journal article, 2020)
      This study investigates the use of experimental modal analysis to identify the modal properties of a railway pantograph system, including component behaviour within the system, for an extended frequency range in three main ...
    • One algorithm, two timber bridges built in Orkdal, Norway 

      Mork, John Haddal; Luczkowski, Marcin; Dyvik, Steinar Hillersøy; Manum, Bendik; Rønnquist, Anders (Chapter, 2017)
      The building industry is about to embrace mass customization. In recent years, iconic buildings have demanded a new way of approaching design and manufacturing. We, among others, believe that parametrization is key to fully ...

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