Author/Authors :
Mehrpay Saeid نويسنده He has attained his MSC degree in Structural Engineering from University of Guilan in 2014. , Jalali Reza S. نويسنده Assistant Professor at the Department of Civil Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran.
Abstract :
زبان چكيده حــذف
382302 The research, presented in this paper, aims to investigate the behavior of a High-Strength Steel Fiber-Reinforced Concrete (HSSFRC) mesoscopic _nite element model at compressive high strain rates. In order to produce a three-dimensional meso-scale _nite element model, a computer code is developed to randomly produce mesoscopic models ofSFRC specimen. The specimen is assumed to be reinforced by 0.6 percent volume fraction of hooked steel _bers (Dramix RC-65/35-BN) with random positions and orientations.Aggregates of the compound are assumed to have spherical shape and are produced according to Fuller grading curve. Based on the initial mesoscopic model, a _nite element model is produced and used in an explicit dynamic simulation. The contribution of inertial con_nement to the dynamic strength enhancement of concrete at high strain rates was investigated, and its e_ective role was observed. Accordingly, de_ning a Dynamic Increase Factor (DIF) for mortar matrix led to overestimation; nevertheless, the inertial con_nement by itself could not justify the increment of specimen strength under the dynamic loading. Obtained results also show that steel _bers have a negligible inuence on the strength, strength enhancement ratio (DIF), and post-peak behavior of the model at high strain rates.
