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  • Risk based inspection planning for welded offshore steel structures
  • Advanced statistical methods for analyzing fatigue life data
  • Linear / nonlinear analysis of  civil structures with computational modelling and experimental approaches
  • Investigation of minor axis and 3D steel structural connections
  • Offshore wind turbine technologies

Selected publications

  • S. Ding; Rotter, J.M.; Ooi, J.Y; Enstad, Gisle Gotfred; Xu, D., 2013, Normal pressures and frictional tractions on shallow conical hopper walls after concentric filling: predictions and experiments, Chemical Engineering Science; Volume 89. s. 264-27. http://dx.doi.org/10.1016/j.ces.2012.11.028
  • S. Ding, Rotter, M., Ooi, J. Y., and G.G. Enstad, 2011, Finite element investigations into the loads developed along the walls of a steep hopper during filling, Journal of Thin-Walled Structure 49: p 1246-1250, Oct.  http://dx.doi.org/10.1016/j.tws.2011.05.010
  • Inconsistencies in the pozzolanic Strength Activity Index (SAI) for silica fume according to EN and ASTM, Accepted with minor changes for journal Materials and Structures, Springer 2014.
  • Last planner system innovation efforts on requirements for digital management system, RT Thorstensen et al., Proceedings of the 21st Conference of the International Group for Lean Construction 2013
  • Making UHPC with local materials - the way forward, P Fidjestol, RT Thorstensen, PR Svennevig, Proceedings of HiPerMat 2012, 3rd international symposium on UHPC and Nanotechnology for High Performance Construction
  • P. Lazzarin, T. Lassen, P. Livieri : "A Notch Stress Intensity approach applied to fatigue strength predictions of welded joints with different weld toe radii." International Journal of Fatigue & Fracture of Engineering Materials & Structures, January 2003  
  • Lassen,T, Darcis, Ph. and Recho, N. 2005: Fatigue behavior of Welded Joints    Part 1- Statistical Methods for Fatigue Life Predictions. Welding Journal 84 (12): 183-s to187-s.
  • T. Lassen and N. Recho: Proposal for a more accurate physically based S-N curve for welded steel joints. International Journal of Fatigue, Elsevier, - January 2009, pp 70-78.
  • S. Ding, Ying, J., Senbin Ye, Rotter, M. and Qi Li., 2014, Measurements of pressure and frictional traction along walls of a large-scale conical shallow hopper and comparison with Eurocode 1991- 4:2006,  Journal of Thin-Walled Structure, vol. 80, p231-238 DOI    http://dx.doi.org/10.1016/j.tws.2014.03.008
  • Numerical and experimental parametric study of the ultimate behavior of eye-bars, POLLACK PERIODICA Vol. 2: pp. 75-92. (2007)
  • Investigation of minor axis ad 3D bolted end-plate connections, PERIODICA POLYTECHNICA-CIVIL ENGINEERING 49:(1) pp. 47-58. (2005)
  • Investigation of minor axis and 3D bolted end-plate connections - experimental and numerical analysis - load tests PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING 49:(1) pp. 47-58. (2005)


Research partners

  • Ecole des ingénieurs, Paris, France
  • University of Budapest, Hungary
  • University of Edinburgh, Scotland
  • TU Delft, The Netherlands
  • Norwegian University of Science and Technology, Norway
  • University of Stavanger, Norway


Future projects

A PhD program in technology within the analysis of offshore steel structures is to be established. For this purpose, it is planned to recruit two Ph.D. students. The areas within the offshore structure and strength analysis will be important when establishing the Sørlandslab with new testing facilities together with the NODE industrial group.

Previous projects

  • Optimization of structures
  • Investigation on the fatigue strength of welded joints
  • Analysis of heavy loaded eye-bars
  • Strength analysis of thin walled hopper silos

PhD Projects

  • Zbigniew Mikulski, Fatigue of welded joints, 2016-2020
  • Vidar Hellum, Offshore mooring systems, 2018-2021
  • Mohammad Ali Mahdavipour, Structural connections, 2018-2021
  • Guodong Liang, Mooring systems of floating wind farms, 2019-2022
  • Ingrid Lande Larsen, Shear behavior of UHPC, 2016-2021
  • Otto Terjesen, Concrete bridges, 2019-2022

Research facilities

  • 250 kN tensile testing machine (to be upgraded)

Leader of group