Author, Institution: Šarūnas Kelpša, Kaunas University of Technology
Science Area, Field of Science: Technological Sciences, Civil Engineering – 02T
Scientific Supervisor: Prof. Dr. Mindaugas DAUKŠYS (Kaunas University of Technology, Technological Sciences, Civil Engineering, 02T).
Scientific Advisor: Assoc. Prof. Dr. Mindaugas AUGONIS (Kaunas University of Technology, Technological Sciences, Civil Engineering, 02T).
Dissertation defence board of Civil Engineering science field:
Prof. Dr. Raimondas BLIŪDŽIUS (Kaunas University of Technology, Technological Sciences, Civil Engineering, 02T), chairman;
Prof. Dr. Žilvinas BAZARAS (Kaunas University of Technology, Technological Sciences, Civil Engineering, 02T);
Prof. Dr. Terje KANSTAD (Norwegian University of Science and Technology, Technological Sciences, Civil Engineering, 02T);
Assoc. Prof. Dr. Darius ZABULIONIS (Vilnius Gediminas Technical University, Technological Sciences, Civil Engineering, 02T).
The Doctoral Dissertation is available at the library of Kaunas University of Technology (K. Donelaičio St. 20, Kaunas)
Annotation:
In order to establish the steel fibre influence on cracking and deflection of fibre and combined reinforced concrete structures the research has been done and the dissertation was prepared. The dissertation is consisted of 4 chapters, conclusions and the list of references.
The literature review is done in the first chapter. The steel fibre application for structures, steel fibre reinforced concrete properties, its determination and statistical evaluation are researched. Crack width and deflection calculation methods of steel fibre and combined reinforced concrete structures are also analysed.
Experimental results of steel fibre and combined reinforced concrete members are presented in the second chapter.
In accordance with experimental results the adjustment coefficients of Naaman’s and Sujivorakul’s methods are deduced in the third chapter which give a possibility to approximately calculate the residual tensile stress σfb. Also, fRm,1 and Vx calculation methods are created and analysis of its application in crack width calculations of combined reinforced concrete beams is done.
A practical plastic hinge calculation method is developed in the fourth chapter which is suited for crack with and deflection analysis of steel fibre reinforced concrete beams. Also, during the deflection analysis of combined reinforced concrete beams a residual flexural tensile strength modification method is devised which leads to more precise deflection calculations when fRm,1 > fctm,fl,fb.
