|
Title |
Model Generalization for Flexural Toughness of Fiber Reinforced-Normal and -Lightweight Aggregate Concretes
|
|
DOI |
https://doi.org/10.4334/JKCI.2023.35.1.049 |
|
Keywords |
섬유 보강 콘크리트; 휨 인성; 콘크리트 밀도; 섬유보강지수 fiber reinforced concrete; flexural toughness; concrete density; fiber reinforcing index |
|
Abstract |
Closed-form equations to straightforwardly assess the flexural toughness indices of fiber-reinforced concrete (FRC) beams are proposed herein. The flexural toughness indices were calculated in accordance with ASTM C1018 in the flexural load- deflection curves predicted via a section lamina approach, considering the constitutive equations for FRC in compression and tension. Based on the numerical analysis, a parametric study was then conducted under a wide range of main parameters, including the compressive strength and density of concrete, the fiber-reinforcing index, and aggregate size. The outputs obtained from the parametric study were used for formulating the closed-form equations by repetitive regression analyses. The flexural toughness indices predicted from the proposed equations were in good agreement with experiments compiled from previous FRC beam specimens prepared using normal-weight or lightweight aggregate concretes.
|