A model for strength and strain analysis of steel fiber reinforced concrete / Betono, armuoto plienine dispersine armatura, stiprio ir deformaciju apskaiciavimo modelis

• Main Authors: Gediminas Marciukaitis, Remigijus Šalna, Bronius Jonaitis, Juozas Valivonis
• Format: Article
• Language: English
• Published: Vilnius Gediminas Technical University 2011-04-01
• Series: Journal of Civil Engineering and Management
• Subjects: composite; concrete; steel fiber; fiber reinforced concrete; strength; secant modulus
• Online Access: https://www.jbem.vgtu.lt/index.php/JCEM/article/view/5129

The article proposes a model for strength and stain analysis of steel fiber reinforced concrete (SFRC). The model is based on general principles for creating and modelling structural composites and on reinforced concrete code. Differently from other examples, the elastic and plastic properties of the components (concrete and steel) of the introduced model are directly taken into account. The model gives an opportunity to determine tension and compression strength, the elasticity modulus of fiber concrete and the main parameters of its elasticity and plasticity. A good agreement between the obtained results and those of experiments performed by other investigators was confirmed. Differences between the ratios of theoretical and experimental values are insignificant and vary within the limits of 1.06–1.10. This model may be used for the analysis of reinforced concrete members reinforced by steel fibers (SFRC) in a dispersible way assuming stress distribution diagrams. Santrauka Straipsnyje pasiulytas betono, armuoto plienine dispersine armatura, stiprio ir deformaciju skaiciavimo modelis, pagristas bendraisiais statybiniu kompozitu kurimo ir modeliavimo principais bei gelžbetonio normomis. Šiame modelyje skirtingai nuo daugelio kitu yra tiesiogiai ivertinamos tampriosios ir plastinės kompozito komponentu (betono ir plieninės dispersinės armaturos) savybės. Modelis leidžia apskaiciuoti betono, armuoto plienine dispersine armatura, tempiamaji ir gniuždomaji stiprius, tamprumo moduli ir pagrindinius jo deformatyvumo parametrus—tamprumo ir plastiškumo koeficientus. Siulomo modelio palyginimas su šio straipsnio ir kitu autoriu atliktais eksperimentu duomenimis parodė, kad rezultatai sutampa. Teoriniu ir eksperimentiniu reikšmiu santykiai skiriasi nedaug ir kinta nuo 1,06 iki 1,10. Šis modelis gali buti taikomas priimant itempiu pasiskirstymo diagramas apskaiciuojant lenkiamuosius, plienine dispersine armatura armuotus betoninius elementus. Reikšminiai žodžiai: kompozitas, betonas, plieninė dispersinė armatura, betonas, armuotas plienine dispersine armatura, deformaciju modulis, tampriosios ir plastinės deformacijos