Ulfkjaer, Jens Peder

Jens Peder Ulfkjaer was member of the Group of Risk and Safety at ETH from 2004 to 2006.

Curriculum Vitae
Jens Peder Ulfkjaer was born in Ringkøbing in Denmark in 1963. He got his master in Building Construction in 1988 at Aalborg University in Denmark and his Ph.D. on fracture of materials in 1992 at the same University. He has been working with fracture of quasi-brittle materials, and in particular with fracture of ultra high strength concrete at low medium and very high strain rates. He has also been involved in many test activities both static and dynamic, developing software for data analyzing and doing finite element analysis.

Research
I am involved in the MERCI project which aims to develop a generic decision theoretical framework for the consistent quantitative and rational management of earthquake risks.

Publications

• Y. Y. Bayraktarli, J.P. Ulfkjaer, U. Yazgan and M. H. Faber,
  On the Application of Bayesian Probabilistic Networks for Earthquake Risk Management,
  Proceedings of ICOSSAR 2005, Rom, Italy, June 19-23, 2005

• J.P. Ulfkjaer
  Manual for M-file Library for PreOpenSeesPro,
  Electronic user manual, 2004.

• J.P. Ulfkjaer, O. Huth, G. Feltrin and N. Kilic
  Model Update and Damage Identification on a Prestressed Bridge Using Model Parameters and Input Residuals.
  Presented at IMAC, 2003.

• J.P. Ulfkjaer,F. Weber, B. Aaldrink and G. Feltrin
  Vibration Control of Cables with Magnetic Rheological Fluid Dampers: An Experimental Investigation.
  Presented at footbridge 2002, Paris November 20-22 2002.

• J.P. Ulfkjaer and J.G.M. van Mier
  Fracture Parameters of Plain Notched Concrete Beams at Different Rates of Loading, report to the Danish technical research council, March 2000.
  Round-Robin Analysis of Over Reinforced Concrete Beams - Comparison of results,
  Materials and Structures - July 2000, Vol. 33 – No. 230.

• J.P. Ulfkjaer
  Effect of Scale, Reinforcement Ratio, Concrete type and Loading rate of Plain and Lightly reinforced Concrete,
  ESIS Technical Committee 9 Special Technical Publication, pp. 1-40, 1998.

• J.P. Ulfkjaer, with K. Labibes, G. Solomos and C. Albertini
  Tensile Failure of Concrete and Steel Fibre Reinforced Concrete at High Strain Rates,
  Invited lecturer presented at FRAMCOS III, AEDIFICATO publishers, Editors H. Mihashi and K. Rokugo, Gifu Japan, October 12-14 1998, pp. 585 - 592.

• J.P. Ulfkjaer
  Experimental Investigation of Over-Reinforced Concrete Beams of Three Different Types of Concrete and at Two Different Size Scales,
  Invited lecturer presented at FRAMCOS III, AEDIFICATO publishers, Editors H. Mihashi and K. Rokugo, Gifu Japan, October 12-14 1998, pp. 1253 - 1260.

• Manual for M-file Library for Hopkinson bar analysis, electronic HTML user manual, 1998.

• Invitation to a competition on: Modelling of Over-Reinforced Concrete Beams, with J.G.M. van Mier, and H. Stang, 1997 pp. 1-33.

• Tensile Failure of Concrete and Steel Fibre Reinforced Concrete at High Strain Rates, with K. Labibes, E. Cadoni, G. Solomos and C. Albertini, presented at Advanced Design of Concrete Structures, Eds. K. Gylltoft, B. Engstroem, L. -O. Nielsson, N. -E. Wiberg and P. Aahman, Gothenburg, June 12-14 1997.

• Fracture Energy of Plain Concrete Beams at High Rates of Loading, with S Quist and E.K. Lauritzen, presented at Structures Under Shock and Impact 96, Udine, Italy, July 3-5 1996, pp. 415 -425.

• Fracture Behaviour of High Reinforced High Strength Concrete and High Strength Steel Fibre Reinforced Concrete Beams, with B. Aarup and M.S. Henriksen, presented at 11th European Conference on Fracture, Poitiers, France, September 3-6 1996.

• Analytical Model for Hook Anchor Pull-Out. with R. Brincker, P. Adamsen, L. Langvad and R. Toft, presented at the International Symposium on Anchors in Theory and Practice, Salzburg, Austria, October 10-11 1995.

• Fracture Energy of Normal Strength Concrete, High Strength Concrete and Ultra High Strength Ultra Ductile Steel Fiber Reinforced Concrete, with H.H. Bache, R. Brincker and N.B. Sørensen, presented at FRAMCOS 2, Zurich, Switzerland, July 25-28 1995.

• Size Effects on the Rotational Capacity of Reinforced Concrete Beams, with M.S. Henriksen, R. Brincker and G. Heshe, presented at SEM Spring Conference, June 12-14 1995, Grand Rapids, Michigan.
  Proceedings Nordic Symposium on Modern Design of Reinforced Concrete Structures, editors J.P. Ulfkjær and M. Modéer, Aalborg University, May 3-5 1995, (ISSN 0902 7513 R9513).

• Rotational Capacity of Reinforced Concrete Beams, with L. P. Hansen, G.Heshe, J.K.J.Jensen and M.S. Henriksen, presented at Nordic Symposium on Modern Design of Concrete Structures, Aalborg, Denmark, May 3-5 1995.

• Analytical Model for Hook Anchor Pull-Out. with R. Brincker, P. Adamsen, L. Langvad and R. Toft,
  Nordic Symposium on Modern Design of Concrete Structures, Aalborg, Denmark, May 3-5 1995.

• Analytical Model for Fictitious Crack Propagation in Concrete Beams. with R. Brincker and S. Krenk,
  Journal of Engineering Mechanics, Vol. 121, No.1, pp. 7- 15, 1995.

• Damage Detection in Laboratory Concrete Beams. with R. Brincker, P.H. Kirkegaard and P. Andersen,
  13th IMAC, Nashville, USA, February 1995.

• Analytical Model for Fictitious Crack Propagation in Reinforced Concrete Beams Without Debonding, with R. Brincker,
  Invited paper presented at IUTAM Symposium on Size-Scale Effects in the Failure Mechanisms of Materials and Structures, Torino, Italy, October 3-7 1994.

• Simple Application of Fictitious Crack Model in Reinforced Concrete Beams - Analysis and Experiments, with R. Brincker,
  Presented at the JCI International Workshop on Size Effect in Concrete Structures, Sendai, Japan, October - November 1993.

• Simple Application of Fictitious Crack Model in Reinforced Concrete Beams, with R. Brincker,
  Presented at IUTAM Symposium on Fracture of Brittle Disordered Materials: Concrete, Rock and Ceramics, Queensland, Australia, September 1993.

• Indirect Determination of the sigma-w Relation of HSC through Three-Point Bending, with R. Brincker,
  Presented at FDCR-2, Vienna, Austria, November 9-13, 1992 and at Nordisk miniseminar om Udmattelse i Beton, Aalborg, Denmark, November 19-20, 1992.

• J.P. Ulfkjaer
  Fracture Mechanics of Concrete - Analysis and Test of Beams in Three Point Bending.
  Ph.D.-Thesis, Aalborg, Denmark, 1992.

• Analytical Model for Complete Moment-Rotation Curves for Concrete Beams in Bending, with R. Brincker and S. Krenk,
  Presented at the 8th European Conference on Fracture, Torino, Italy, 1990.

• Modelling of Crack Growth Processes by Introduction of a Characteristic Length. with R. Brincker and L. Gansted,
  Presented at Scandinavian Forum for Stochastic Mechanics, Aalborg, Denmark, 1991.

• J.P. Ulfkjaer and John Johnsen
  Stochastic Dynamic Stability Theory for Linear Elastic Systems,
  M.Sc Thesis, Aalborg, Denmark, July 1988 (in Danish).

• Apart from these publications, Dr. Ulfkjaer contributed to confidential scientific reports for private companies.

Teaching

• Lecture on Risk and Safety in Civil Engineering
  

• Master thesis

• Semester thesis