Edgaras Timinskas

FRP reinforcement for concrete structures: state-of-the-art review of application and design

AbstractFiber reinforced polymers (FRPs) are considered to be a promising alternative to steel reinforcement, especially in concrete structures subjected to an aggressive environment or to the effects of electromagnetic fields. Although attempts to develop effective reinforcement have been followed, the application of FRPs remains limited by the solution to simple structural problems that mainly appear due to the absence of design codes, significant variation in the material properties of FRP composites and limited knowledge gained by engineers as regards the application aspects of FRP composites and structural mechanics of concrete elements reinforced with FRPs. To fill the latter gap, the current state-of-the-art report is dedicated to present recent achievements in FRPs applying practice to a broad engineers’ community. The report also revises the manufacturing process, material properties, the application area and design peculiarities of concrete elements reinforced with FRP composites. Along the focu...

Accuracy analysis of design methods for concrete beams reinforced with fiber reinforced polymer bars

AbstractTraditional steel reinforcement does not resist corrosion and its resources are limited; therefore, carbon, glass, aramid and basalt fibre reinforced polymer bars were developed. The composite reinforcement has a high tensile strength and resistance to electromagnetic fields. Different kinds of materials and application of various surface coatings are used in the production of the composite bars. This results in different adhesion to concrete and mechanical properties of composite bars. In comparison with steel reinforcement, glass, aramid and basalt fibre reinforced polymer bars have a lower modulus of elasticity. Thus, structural rigidity provided by these bars is smaller in respect to reinforced concrete elements. Current reinforced concrete design codes and recommendations are based on empirical and simplified methods of strain evaluation, which may be inadequate for design of structures with composite bars. In this paper, an adequacy of the empirical models was checked against the experimenta...

Tempiamųjų gelžbetoninių elementų diskrečiųjų plyšių modelio analizė

Santrauka Siame straipsnyje aptariamas gelžbetoninių elementų pleisėjimo diskretusis modelis. Pastaraisiais metais pleisėjimo diskretieji modeliai tobulinami ypac intensyviai tikintis, kad būtent sis modeliavimo būdas ateityje galėtų tapti universalia gelžbetoninių elementų projektavimo priemone. Analizuojamas modelis pagrįstas slyties įtempių armatūros ir betono sąlycio zonoje bei armatūros slinkties deformacijų priklausomybėmis. Taikant sį modelį galima apskaiciuoti plysio plotį ir nustatyti deformacijų bei įtempių pasiskirstymą supleisėjusiame betone. Straipsnyje atliktas eksperimentinių tempiamųjų gelžbetoninių elementų modeliavimas bei parodyta, kad literatūroje rekomenduojamos slyties įtempių sąlycio zonoje ir armatūros slinkties idealizacijos gali buti netikslios.