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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
  • Norwegian University of Science and Technology, Norway
  • University of Stavanger, Norway

Planned projects

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

Previous projects and programmes

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

Projects and programmes

  • Fatigue life predictions of large mooring chains in high strength steel
  • Strength and fatigue durability of bonded offshore loading hoses
  • Rolling contact fatigue for large offshore turret bearings
  • The behavior of structural joints
  • Analysis of thin walled structures

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