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Best degree project in steel structures 2019

Published: 13 November 2019

The Swedish Institute of Steel Construction's award and scholarship for the best degree project in steel structures includes SEK 20,000 which accrues to the fellow. This year's prize goes to Simon Stahlin, Luleå University of Technology.

Simon Stahlin studied the Master Programme in Civil Engineering at Luleå University of Technology. Today he works for the consulting company Svensk Industriteknik with clients such as LKAB, SSAB, Kaunis Iron, and SCA.

"I think the degree project has been extremely interesting and challenging. To receive the award for best degree project in steel construction 2019 is great, says Simon Stahlin.

Supervisors for the degree project were Professor Peter Collin, Dr. Robert Hällmark and Dr. Rasoul Nilforoush.

Motivation of the jury

"The thesis deals with how to retroactively achieve collaboration between steel beams and concrete siding in bridges originally designed and erected without collaboration between these parts, and how this can be modeled. The report studies a case where collaboration is achieved through the re-installation of shear connectors of so-called spring coils. These have the advantage that they are easy to assemble but at the price of an unlinear shear stiffness. The report includes a finite element simulation of a typical bridge with some elements that are far out of the ordinary. Firstly, the concrete track is modeled taking into account both longitudinal and cross reinforcement. In addition, a combined plasticity and damage model is used as a constitutive model for the concrete.

Modeling concrete in FE analyzes is usually difficult even with significantly less advanced constitutive models. Finally, the interaction between steel and concrete is modeled with non-linear springs whose properties are determined via shear tests of spring coils. The author has tackled an extremely difficult technical problem and has landed with it. For that, he is rewarded with the Steel Building Institute's award for best degree project in 2019."

Peter Collin

Peter Collin, Professor

Organisation: Structural Engineering, Structural and Fire Engineering, Department of Civil, Environmental and Natural Resources Engineering