This picture showsJosipa Bosnjak

Dr.-Ing.

Josipa Bosnjak

Head of Unit / Deputy Head of Unit
Materials Testing Institute
F&E-Structural Hazard Engineering / Material Behavior and Modelling

Contact

+49 711 685-63377
+49 711 685-66828

Pfaffenwaldring 4c
70569 Stuttgart
Germany

Subject

Material behaviour and modelling, Structural hazard engineering, Concrete technology

Main areas of activity:

  • Material behaviour
  • Numerical modelling
  • Fire behaviour of reinforced concrete and masonry
  • Explosive spalling of concrete at elevated temperatures
  • Corrosion of reinforced concrete
  • Retrofitting and strengthening of reinforced concrete structures
  • Concrete technology

2020

Sharma, A., Bošnjak, J.: Residual bond performance after exposure to different heating regimes – elevated temperature vs. fire. Fib Bulletin "Advances on Bond in Concrete", 2020 (accepted for publication)

Bošnjak, J., Gambarelli, S., Sharma, A., Mešković, A.: Experimental and numerical studies on masonry after exposure to elevated temperatures. Construction and Building Materials, Vol. 230, 2020, https://doi.org/10.1016/j.conbuildmat.2019.116926

2019

Bošnjak, J., Gambarelli, S., Sharma, A., Mešković, A.: Experimental and numerical studies on masonry after exposure to elevated temperatures. Otto-Graf-Journal, Vol. 18, pp. 41-52 (2019)

Bošnjak, J., Schellhorn, H., Dilek. E., Öttl, C.: Concerning the use of ground coal bottom ash as a partial substitute for cement. Otto-Graf-Journal, Vol. 18, pp. 53-64 (2019)

Bošnjak, J.: Numerische Modellierung des Mauerwerks im Blauen Turm auf Grundlage von kleinformatigen Mauerwerksprüfkörpern, Tagungsband zum Kolloquium am 17.05.2019, Fraunhofer IRB Verlag (2019)

Das, A., Bošnjak, J., Sharma, A.: Numerical investigations on post-fire bond behaviour of reinforcement in concrete. RILEM Technical Letters. 4. 1-8. 10.21809/rilemtechlett.2019.88. (2019)

Sharma, A., Bošnjak, J., Bessert, S.: Experimental investigations on residual bond performance in concrete subjected to elevated temperature. Engineering Structures. 187. 384-395.10.1016/j.engstruct.2019.02.061. (2019)

Bošnjak, J., Sharma, A., Grauf, K.: Mechanical Properties of Concrete with Steel and Polypropylene Fibres at Elevated Temperatures. Fibers. 7. 13. 10.3390/fib7020009. (2019)

2018

Sharma A., Bošnjak, J., Aravindhan, C.P. Thermal degradation of bond between steel and steel fiber reinforced concrete. 20th ibausil, Weimar. (2018)

Bošnjak, J., Sharma A., Grauf, K. Temperature-dependent behavior of fiber reinforced concrete. 20th ibausil, Weimar. (2018)

Sharma A., Bošnjak J., Mešković A., Stipetić M.  Experimental evaluation of the performance of masonry at elevated temperatures. 10th International Masonry Conference, Milan. (2018)

Bošnjak, J., Sharma, A., Öttl, C. Modified beam-end test setup to study the bond behavior of reinforcement in concrete after fire. Mater Struct (2018) 51: 13. https://doi.org/10.1617/s11527-018-1138-7

Bošnjak, J., Stegmaier, M., Grüner, F. (2018) Experimental investigation of the natural stone masonry before and after pre-damage – “Blauer Turm” case study. 10th International Masonry Conference, Milan (Italy). (2018)

Sharma A., Bošnjak J., Mešković A., Stipetić M. Experimental evaluation of the performance of masonry at elevated temperatures. 10th International Masonry Conference, Milan. (2018)

2017

Bošnjak, J., Sharma, A.,  Bessert, S. Bond performance of reinforcement in concrete after exposure to elevated temperatures. ConSC – Connections between Steel and Concrete, Stuttgart. (2017)

Bošnjak, J., Sharma, A. (2017) Bond between steel and concrete under fire – from laboratory tests to fire performance. ConSC – Connections between Steel and Concrete, Stuttgart. (2017)

Sharma, A., Bošnjak, J. (2017) Residual tensile capacity of post-installed anchors after exposure to fire. ConSC – Connections between Steel and Concrete, Stuttgart. (2017)

Öttl, C., Bosnjak, J., Schellhorn, H.: Betrachtungen zur Druck- und Biegezugfestigkeit von Zementmörtel – Auswertung von Überwachungsergebnissen der letzten 25 Jahre. In: Stumpp, S.; Ullmann, D.: Werkstoffe, Denkmalschutz und…, Festschrift zum 60. Geburtstag von Prof. Dr.-Ing. Harald Garrecht, IWB Universität Stuttgart, ISBN 978-3945773-05-5, S. 263-272. (2017)

Bošnjak, J.; Stegmaier, M.: Blauer Turm – Untersuchungen zur Ermittlung der Druckfestigkeit von historischem Mauerwerk. In: Stumpp, S.; Ullmann, D.: Werkstoffe, Denkmalschutz und…, Festschrift zum 60. Geburtstag von Prof. Dr.-Ing. Harald Garrecht, IWB Universität Stuttgart, ISBN 978-3945773-05-5, S. 53-62. (2017) 

Bošnjak J., Sharma A., Ožbolt J. Modelling Bond between Reinforcement and Concrete after Exposure to Fire. CFRAC Fifth International Conference on Computational Modeling of Fracture and Failure of Materials and Structures. (2017)

Sharma A., Bošnjak J., Ožbolt J. Modelling Mixed Mode Fracture of Concrete under Dynamic Loading. CFRAC Fifth International Conference on Computational Modeling of Fracture and Failure of Materials and Structures. (2017)

2016

Sharma, A., Bošnjak, J., Ožbolt, J., Hofmann, J.: Numerical modelling of reinforcement pull-out and cover splitting in fire-exposed beam-end specimens. Engineering Structures Vol.111 (2016) pp. 217-232.

2014

Ožbolt, J., Bošnjak, J., Periškić, G., Sharma,A.: 3D numerical analysis of reinforced concrete beams exposed to elevated temperature. Engineering Structures, 58, pp.166–174. (2014)

2013

Bošnjak, J., Ožbolt, J. & Hahn, R. Permeability measurement on high strength concrete without and with polypropylene fibers at elevated temperatures using a new test setup. Cement and Concrete Research, 53, pp.104–111. (2013)

Ožbolt, J., Bošnjak, J., Sola, E.: Dynamic fracture of concrete compact tension specimen: Experimental and numerical study. International Journal of Solids and Structures, 50(25), pp.4270–4278. (2013)

Ožbolt J., Bošnjak J.: Modelling explosive spalling and stress induced thermal strains of HPC exposed to high temperature. Proceedings of the 3rd International RILEM Workshop - Concrete Spalling due to Fire Exposure, (Eds. Pimienta, Meftah), pp. 252-259. (2013)

Bošnjak, J., Ožbolt, J., Sharma A. and Periškic G.: Permeability of concrete at high temperatures and modelling of explosive spalling. Proceedings of the 8th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-8), (Eds. van Mier, Ruiz, Andrade, Yu, Zhang), CD-Rom, Paper ID 363. (2013)

2012

Bošnjak, J. and Ožbolt, J. :Numerical simulation of concrete exposed to high temperature - explosive spalling. Proceedings of the 9th fib PhD Symposium, KIT Karlsruhe, pp. 465-470. (2012)

Ožbolt, J. and Bošnjak, J.: Thermo-hygro-mechanical model for concrete – deterioration of material and explosive spalling at elevated temperatures. Proceedings of the symposium in honour of Prof. Pietro Gambarova in the occasion of his 70th birthday – Advances in cementitious materials and structure design, pp. 117-123. (2012)

2011

Richter, R., Grosse, C., Bošnjak, J., Ožbolt, J.: Schallemissionsanalyse und numerische Simulation zur Schädigungsanalyse bei Brandversuchen mit hochfestem Beton. Deutsche Gesellschaft für zerstörungsfreie Prüfung, Jahrestagung Bremen. (2011)

Ožbolt, J., Bošnjak, J., Periškić, G., Grosse, C.: Numerical simulation of concrete exposed to high temperature – damage and explosive spalling. Proceedings of the 2ndInternational RILEM Workshop - Concrete Spalling due to Fire Exposure (Eds. Koenders, Dehn), pp. 25-32. (2011)

Ožbolt, J. and Bošnjak, J.: Numerical simulation of the effect of high temperature on flexural and splitting strength of plain concrete. Transactions, SMiRT 21, Div-II: Paper ID 572. (2011)

Ožbolt, J., Periškić, G. Sharma, A. Bošnjak, J. Travaš, V., Reinhardt, H.W.: Modeling of concrete exposed to severe loading conditions – impact and fire. postSMiRT 21 Conference. (2011)

  • fib TG 2.5 “Bond and Material Models”
  • RILEM Technical Committee SPF “Spalling of concrete due to fire: testing and modelling”
  • DIN Standards Committee NA 005-02-04 AA „ Fibre-cement flat sheets”
  • HI-RES Haunch Innovative Retrofit for European Seismic Design
    (Funding: EU - European Research Council)

Supervised bachelor, master theses

2019

Ivković, A: Ermittlung des Polyproplyenfasergehaltes am Festbeton. Master thesis, Materials Testing Institute University of Stuttgart, 2019

Dilek, E.: Gemahlenen Kesselsand als Zementersatz im Beton - Wege zur Verbesserung der Ökobilanz vom Beton. Bachelor thesis, Materials Testing Institute University of Stuttgart, 2019

Nanou, E.: Ertüchtigung von Beton nach einer thermischen Belastung. Bachelor thesis, Materials Testing Institute University of Stuttgart, 2019

Bajramović, E.: Ertüchtigung von Beton nach einer thermischen Belastung. Bachelor thesis, Materials Testing Institute University of Stuttgart, 2019

Maxharraj, E.: Verhalten von Einzel- und Gruppenbefestigungen nach einer Brandbeanspruchung

Bachelor thesis, Materials Testing Institute University of Stuttgart, 2019

2018

Grauf, K.: Verhalten der Faserbetone nach thermischer Belastung. Bachelor thesis, Materials Testing Institute University of Stuttgart, 2018

Sedano, A.G.: Numerical analysis of bond between steel and concrete under elevated temperatures. Master thesis, Materials Testing Institute University of Stuttgart, 2018

Aravindhan, C.P.K: Verbundverhalten der normal und hochfesten Faserbetone nach thermischer Belastung. Bachelor thesis, Materials Testing Institute University of Stuttgart, 2018

Tonidis, M.: Behavior of lap splices under fire. Bachelor thesis, Materials Testing Institute University of Stuttgart, 2018

2017

Haremski, V.:Einfluss der Zementart und der Flugaschezugabe auf die Entwicklung der Hydratationswärme im Beton. Bachelor thesis, Materials Testing Institute University of Stuttgart, 2017

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