• 3D reconstruction of existing concrete bridges using optical methods 

      Popescu, Cosmin; Täljsten, Björn; Blanksvärd, Thomas; Elfgren, Lennart (Peer reviewed; Journal article, 2019)
      Routine bridge inspections usually consist of visual observations. These inspections are time-consuming and subjective. There is a need to identify new inspection techniques for infrastructure that reduce traffic disturbance, ...
    • A low-cost coastal buoy for ice and metocean measurements 

      Petrich, Christian; O'Sadnick, Megan Eileen; Kleven, Øystein; Sæther, Irina Vasiljeva (Peer reviewed; Journal article, 2019)
      Regionally, an ice cover in fjords of mainland Norway may form and break up repeatedly during winter. Due to relatively high water temperatures, the freeze-up process is expected to be related to freshwater-induced ...
    • A multi-level strategy for successively improved structural analysis of existing concrete bridges:examination using a prestressed concrete bridge tested to failure 

      Bagge, Niklas; Plos, Mario; Popescu, Cosmin (Journal article; Peer reviewed, 2018)
      This paper describes a multi-level strategy with increased complexity through four levels of structural analysis of concrete bridges. The concept was developed to provide a procedure that supports enhanced assessments with ...
    • An overview of trends and regional distribution of thermal ice loads on dams in Norway 

      Petrich, Christian; Arntsen, Bård (Chapter, 2018)
      Norway has over 3000 dams, over half of which are concrete dams [1]. Static ice loads are considered as part of dam design and during period safety review. They present a significant fraction of the total design load of ...
    • Assessment of RC walls with cut-out openings strengthened by FRP composites using a rigid-plastic approach 

      Popescu, Cosmin; Scmidt, Jacob W.; Goltermann, Per; Sas, Gabriel (Journal article; Peer reviewed, 2017)
      Building refurbishment works frequently require the cutting of new openings in concrete walls. Cutting new openings weakens the overall response of such elements, so they usually require strengthening. However, current ...
    • Axially Loaded RC Walls with Cutout Openings Strengthened with FRCM Composites 

      Sabau, Cristian; Popescu, Cosmin; Sas, Gabriel; Blanksvärd, Thomas; Täljsten, Björn (Journal article; Peer reviewed, 2018)
      Abstract: Upgrading existing buildings to new functional requirements may require new openings that can weaken the structure, prompting the need for strengthening. In such cases traditional strengthening solutions, such ...
    • Carbon Nanotube Spectrally Selective Solar Absorbers 

      Chen, Zhonghua; Nguyen, Quang Hong; Boström, Tobias (Peer reviewed; Journal article, 2015)
      The use of multi-walled carbon nanotubes (MWCNTs) as spectrally selective solar thermal absorbers (SSA) in solar thermal collectors is presented in this paper. CNT layers were coated by electrophoretic deposition (EPD) on ...
    • Common solutions and challenges to the traverse of sea ice by ships 

      Petrich, Christian; Sæther, Irina Vasiljeva (Peer reviewed; Journal article, 2015)
      The specific challenges of ship operations in sea ice-covered waters of the Arctic depend on factors including the purpose of the operation, the capabilities of the ship and equipment available, the degree of situational ...
    • Concrete walls with cutout openings strengthened by FRP confinement 

      Popescu, Cosmin; Sas, Gabriel; Blanksvärd, Thomas; Täljsten, Björn (Peer reviewed; Journal article, 2017)
      Redesigning buildings to improve their space efficiency and allow changes in use is often essential during their service lives to comply with shifts in living standards and functional demands. This may require the introduction ...
    • Effect of Confinement with FRCM Composites on Damaged Concrete Cylinders 

      Gonzalez-Libreros, Jaime; Sabau, Cristian; Sneed, Lesley H.; Sas, Gabriel; Pellegrino, Carlo (Journal article; Peer reviewed, 2017)
      Confinement of axially loaded concrete members in existing structures is required when a change in use is expected or when there is a need to upgrade the structure to meet current design standards. In addition, after unusual ...
    • Effect of Oil Pollution and Ice Formation on Microbial Community of Seawater from Ofotfjorden, Norway 

      Dang, Nga Phuong; Willassen, Nils Peder; O'Sadnick, Megan Eileen; Petrich, Christian (Chapter, 2018)
      Oil spill in ice-covered waters can become entrapped in sea ice and may be subjected to biodegradation by sea ice microorganisms. The extent of the hydrocarbon biodegradation, and microorganisms involved in such process ...
    • Electrophoretically deposited carbon nanotube spectrally selective solar absorbers 

      Chen, Zhonghua; Boström, Tobias (Peer reviewed; Journal article, 2016)
      Three types of carbon nanotubes(CNT) have been investigated regarding their suitability as spectrally selective solar thermal absorbers.The CNT coatings were electrophoretically deposited on aluminum substrates using ...
    • Evaluation of global ice load impacts based on real-time monitoring of ship motions 

      Nyseth, Håvard; Robert, Frederking; Sand, Bjørnar (Peer reviewed; Journal article, 2013)
    • Examination of Sea Ice Cover in Norwegian Fjords 

      O'Sadnick, Megan Eileen; Petrich, Christian; Brekke, C; Skarðhamar, J. (Lecture, 2017)
      Presented are two steps being taken to examine sea ice coverage in Norwegian fjords as part of a larger study to improve our understanding of ice formation and breakup processes in these regions and implications for oil ...
    • Experimental and Micro-CT study on the Oil Distribution in laboratory grown Sea Ice 

      Salomon, Martina Lan; Arntsen, Martin; Dang, Nga Phuong; Maus, Sønke; O'Sadnick, Megan; Petrich, Christian; Schneebeli, Martin; Wiese, Mareike (Peer reviewed; Journal article, 2017)
      Increasing activities in Arctic waters bare a risk of oil spills under ice-covered conditions and afford sound understanding of the interplay between sea ice and oil. Towards better knowledge, this study focuses on X-ray- ...
    • Experimental study on shear deformation of reinforced concrete beams using digital image correlation 

      Huang, Zheng; Tu, Yongming; Meng, Shaoping; Sabau, Cristian; Popescu, Cosmin; Sas, Gabriel (Journal article; Peer reviewed, 2019)
      This paper presents an experimental program aimed at providing reliable and comprehensive experimental data for assessing the available models of predicting the shear deformation of diagonally-cracked reinforced concrete ...
    • Failure tests on concrete bridges: Have we learnt the lessons? 

      Bagge, Niklas; Popescu, Cosmin; Elfgren, Lennart (Journal article; Peer reviewed, 2017)
      Full-scale failure tests of bridges are important for improving understanding of bridges’ behaviour and refining assessment methods. However, such experiments are challenging, often expensive, and thus rare. This paper ...
    • Field measurements on the behavior of brash ice 

      Bonath, Victoria; Zhaka, Vasiola; Sand, Bjørnar (Peer reviewed; Journal article, 2019)
      The behavior and properties of brash ice are important issues for the design of ice-going vessels. Heavy brash ice conditions may cause vessels to be dependent on ice-breaker assistance and time delays in the shipping ...
    • Finite element analysis of shear deformation in reinforced concrete shear-critical beams 

      Huang, Zheng; Lü, Zhitao; Tu, Yongming; Blanksvärd, Thomas; Sas, Gabriel; Elfgren, Lennart (Journal article; Peer reviewed, 2017)
      The objective of this paper was to study the contribution of shear deformation in reinforced concrete (RC) shear-critical beams. A 2D concrete material model based on smeared fixed crack was presented and incorporated into ...
    • Finite element simulation of punch through test using a continuous surface cap model 

      Patil, Aniket; Sand, Bjørnar; Fransson, Lennart (Peer reviewed; Journal article, 2015)
      An attempt has been made to calibrate the material model parameters of the continuous surface cap model with data from punch through tests performed in the Northern Gulf of Bothnia. An axisymmetric finite element model has ...