Head of the project: Ing. Bartuš Jakub

Research team: doc. Ing. Odrobiňák Jaroslav, PhD.

Duration: September 2021 – August 2022

Series of laboratory experiments are proposed. The main purpose is to investigate the bending resistance and the shear flow distribution at steel-concrete interface of the composite castellated beams with asymmetric steel cross-section. Four specimens would be tested. Every specimen would consist of concrete slab and steel beam with web openings. The cross-section of steel element would be welded from two T parts, comprised of different hot-rolled cross-sections halves. The bonding between concrete and steel part would be provided by the shear connectors - headed studs. Load would be applied gradually in the form of 4-point flexure test procedure. The deformation parameters would be measured with strain gauges. For results validation, the finite numerical model would be performed. The results from the experiment and the finite element analysis would be compared. Outcomes from the experiment would be presented in the form of paper in impacted scientific journal and at conference, as well.

Head of the project: prof. Ing. Vičan Josef, CSc.

Research team: doc. Ing. Ďurčanská Daniela, CSc., Ing. Gocál Jozef, PhD., doc. Ing. Koteš Peter, PhD., Ing. Vavruš Martin, PhD.

Duration: April  2021 – March 2024

Current standard methods of reliability theory verify the reliability of structures in terms of limit states caused by permanent and variable resp. accidental loads on structures. Defects and damages of structures due to environmental loads in the form of material degradation during the design structural lifetime are taken into account indirectly or not at all. The absence of the methodology results from insufficiently verified models of material degradation. Therefore, the durability of bridge structures is ensured by the choice of suitable materials, the design of proven structural details, increasing the thickness of cross-sections, increasing the covering layer of reinforcement, as well as eliminating environmental effects by the proper protection of materials and structures. The project research intention is to prepare and develop a concept for the design of cross-sections and elements of steel and reinforced concrete bridge structures regarding to their durability and residual lifetime. Attention will be paid to the allowing for of environmental loads and fatigue cracks in the design of bridge structural elements with outputs in the form of corrosion models of structural and reinforcing steel and proposals for the rehabilitation of damaged structures.

Head of the project: Ing. Zahuranec Michal

Research team: doc. Ing. Koteš Peter, PhD., doc. Ing. Odrobiňák Jaroslav, PhD.

Duration: November 2019 – march 2021

The project is dealing with shear contact between original reinforced concrete and fibre concrete for using different methods of roughing surface. Concrete structures are influenced by degradation, overloading, the thawing and freezing cycles, abrasive damage, corrosion of reinforced bars etc.. All this mentioned influencing decreasing load-carrying capacity. These structures should be repaired or strengthened so fulfil ultimate limit states and serviceability limit states. Concrete structures as vertical columns are usually strengthened by using the concrete encasement of member’s. The main emphasis is put on the interaction of the original reinforced concrete and new concrete. The main factors are cohesion and adhesiveness, which are influencing the resistance of the cross-section. The member´ resistance is changed by the modification of surface. In the frame of the project will be done an experimental measurements taking into account the different methods of the modifications of surface. Subsequently, the results will be compared. The experiment will consist of 15 samples with dimensions 150x150x400mm. These samples will be encasement of the fibre concrete with thickness 35mm. So, the samples for so called push-test will be created. The pressure tests are going to be performed on the samples. The results will be treated and presented in the school round of SVOČ.