Failure mechanisms of reinforced concrete girders on small-scale examples

Predmet ovog završnog rada je prikazivanje stvarnog ponašanja i mehanizma sloma armiranobetonskih greda u umanjenom mjerilu u ovisnosti određenih pravila. Rad se sastoji od dva dijela, gdje u prvom dijelu daje teorijsku podlogu o načelima armiranja, međusobnoj usporedbi dva Eurocode-a (EC2 i EC8) i njihovim razlikama te u konačnici opis i primjenu modela u umanjenom mjerilu. U drugom dijelu opisana je izvedba šesnaest modela armiranobetonskih greda po različitim pravilima armiranja i izvođenje namjernih pogrešaka, pri čemu je detaljno opisana izrada armaturnog koša svakog pojedinačnog modela s iskazom armature. Osim opisa izrade armaturnog koša opisan je i tijek izvedbe oplate i betoniranja. Radi stjecanja uvida u stvarno ponašanje i mehanizam sloma, modeli armiranobetonskih greda bili su podvrgnuti ispitivanju u hidrauličnoj preši s opisanim razvojem prvih pukotina i njihovim napredovanjem do sloma popraćeno fotografijama.The subject of this final paper is to present the actual behavior and failure mechanism of reinforced concrete beams on a reduced scale,depending on certain rules. The paper is consisted of two parts, where in the first part it provides a theoretical basis on the principles of reinforcement, mutual comparison of two Eurocodes (EC2 and EC8), their differences and finnaly a description and application of the model on a reduced scale. The second part describes the construction of sixteen models of reinforced concrete beams according to different rules of reinforcement and the execution of intentional errors, where the construction of the reinforcement basket of each individual model with the statement of reinforcement is described in detail. In addition to the description of the construction of the reinforcement basket, the course of the formwork and concreting is also described. In order to gain insight into the actual behavior and mechanism of fracture, models of reinforced concrete beams would be subjected to testing in a hydraulic press with the described development of the first cracks and their progression to fracture accompanied by photographs