Vibration Based Damaged Detection of Steel Fiber Reinforced concrete

Abstract

Abstract In this present study, static and dynamic properties of steel fiber reinforced concrete (SFRC) were experimentally investigated. The mechanical properties have been carried out by conducting compression, split tensile and flexural strength of SFRCs. In addition, dynamic properties such as damping ratio, mode shape and natural frequency of SFRCs in free-free constraints were also determined with the addition of total fiber volume fraction as 0%, 0.5%, 0.75%, 1% and 1.25% of concrete. Static results emphasize that the addition of steel fiber to concrete significantly increases the performance of mechanical properties. Dynamic test results show that the addition of steel fibers decreases the natural frequency and increases the damping ratio. The damage was induced to concrete specimens by cutting with concrete cutter machine as a depth of 10mm, 20mm and 30mm which has been referred as D1, D2 and D3, respectively. Damping of SFRC beams increases with the increase of damage whilst the fundamental natural frequency decreases with an increase of damage. Numerical modeling was also developed for control and SFRC specimens using ANSYS software to compare the experimental results with the analytical model prediction. It is also observed that the SFRC with a fiber content of 1.25% has the best damping property.