Blar i Institutt for konstruksjonsteknikk på forfatter "Leira, Bernt Johan"
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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, ... -
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 ... -
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 ... -
Impact of Hydrodynamic Interaction Between Pontoons on Global Responses of a Long Floating Bridge Under Wind Waves
Xiang, Xu; Viuff, Thomas; Leira, Bernt Johan; Øiseth, Ole (Chapter, 2018)The hydrodynamic interaction between floating bridge pontoons and its impact on the bridge global responses are investigated in the current study. The global model for end-anchored floating bridge for Bjørnefjord crossing ... -
Long-term extreme response analysis of a long-span pontoon bridge
Giske, Finn-Idar Grøtta; Kvåle, Knut Andreas; Leira, Bernt Johan; Øiseth, Ole (Journal article; Peer reviewed, 2018)For the assessment of extreme load effects needed in design of marine structures, a full long-term analysis is recognized as the most accurate approach. However, due to the very large number of structural response analyses ... -
Long-term extreme response analysis of marine structures using inverse SORM
Giske, Finn-Idar Grøtta; Leira, Bernt Johan; Øiseth, Ole (Chapter; Peer reviewed, 2017)In this paper the first order reliability method (FORM) found in connection with structural reliability analysis is first used in an inverse manner to efficiently obtain an approximate solution of the full long-term extreme ... -
Long-term stochastic extreme response analysis of floating bridges
Giske, Finn-Idar Grøtta; Leira, Bernt Johan; Øiseth, Ole (Journal article; Peer reviewed, 2017)For the assessment of extreme responses needed in design of marine structures, a full long-term analysis is recognized as the most accurate approach. However, due to the very large number of structural response analyses ... -
Methods for Preliminary Analysis of Floating Bridge Structures
Viuff, Thomas; Leira, Bernt Johan; Øiseth, Ole; Xu, Xiang (Chapter, 2016) -
Model uncertainty assessment for wave- and current-induced global response of a curved floating pontoon bridge
Viuff, Thomas Hansen; Xiang, Xu; Øiseth, Ole Andre; Leira, Bernt Johan (Peer reviewed; Journal article, 2020)The present paper provides a comparison between the numerical and experimental response for a generic floating pontoon bridge structure, thereby also serving to quantify the inherent uncertainties associated with both types ... -
Software-to-Software Comparison of End-Anchored Floating Bridge Global Analysis
Viuff, Thomas Hansen; Xiang, Xu; Leira, Bernt Johan; Øiseth, Ole Andre (Peer reviewed; Journal article, 2020)Several computer programs exist to handle general multipurpose offshore structural analysis of slender structures subjected to wave loading, although they have not been developed with the specific purpose of floating bridge ... -
Stochastic Modelling of Wave Loads on Floating Bridges: Efficient Calculation of Cross-Spectral Densities
Giske, Finn-Idar Grøtta; Leira, Bernt Johan; Øiseth, Ole (Chapter, 2016)