Blar i NTNU Open på forfatter "Frøseth, Gunnstein Thomas"
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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 ... -
Design of a monitoring system for a long-span suspension bridge: optimal sensor placement
Petersen, Øyvind Wiig; Øiseth, Ole Andre; Frøseth, Gunnstein Thomas (Chapter, 2020)The design of systems for structural health monitoring is an exercise that requires careful planning of optimal sensor locations. The number of possible locations usually outnumbers the number of available sensors, which ... -
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 ... -
Genetic algorithm for identifying train causing greatest fatigue damage in railway bridges
Bø, Anita; Knudsen, Nora (Master thesis, 2019)Den norske naturen, med sine mange fjell, daler og fjorder, gjør broer til viktige komponenter i landets jernbanenettverk. Jernbanebroene er påkjent av gjen- tatte dynamiske laster, som en følge av at tog kjører over ... -
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 ... -
Numerical Analysis of the Dynamic Response of Existing Railway Bridges.
Frøseth, Gunnstein Thomas (Master thesis, 2014)The railway is an important part of the infrastructure in todays society and there is a need to increase the capacity and verify the existing railway network to face the challenges of tomorrow. To meet todays and the future ... -
Operational Displacement Estimations of Railway Catenary Systems by Photogrammetry and the Integration of Acceleration Time Series
Frøseth, Gunnstein Thomas; Nåvik, Petter Juell; Rønnquist, Anders (Journal article, 2020) -
A robust line-tracking photogrammetry method for uplift measurements of railway catenary systems in noisy backgrounds
Jiang, Tengjiao; Frøseth, Gunnstein Thomas; Rønnquist, Anders; Fagerholt, Egil (Peer reviewed; Journal article, 2020)For electrical railways, contact wires are used to ensure stable and continuous power supply to trains operating on the infrastructure. One crucial design parameter used to control the catenary design is the vertical ... -
Updating of numerical models for enhanced dynamic assessment of existing structures - Analysing parameters for model updating of a riveted steel railway bridge, based on the sensitivity method
Akhtar, Annum Iftikhar; Abnar, Babæk (Master thesis, 2016)Updating a numerical model of a real structure is an important tool to enhance an existing model, such that it represents the structure more accurately. To assess the current state of a structure, and predict the remaining ...