Investigating Torsional Behavior of Fiber Reinforced Self Consolidating Concrete under Cyclic Loading

Abstract

Researchers in the construction industry have shown great interest in rheological and mechanical properties as well as durability of fiber reinforced self-compacting concrete (FRSCC), however, its behavior under torsional cyclic loading, has rarely been studied. In the present experimental research, behavior of fiber reinforced self-compacting concrete under cyclic torsional loading was studied. T-shaped samples consisting of a horizontal beam made of FRSCC and a vertical shaft were made. horizontal beam was fixed at both ends to a rigid base and cyclic loading was applied to the end of the vertical shaft causing a cyclic torque around the horizontal axis of the beam. The vertical shaft was reinforced by longitudinal and transverse bars so that it could not collapse at the time of loading. By plotting the hysteresis diagrams, the torsional strength and energy dissipation of each sample specimen were investigated. Self-compacting concrete C50 class and Hooked End Steel Fibers with length to diameter ratio of 62.5 and different amount of 0, 0.25, 0.5 and 0.75 percent by volume were used. Results showed that the mixture containing 0.5% fibers had the highest energy dissipation of 3.87 times that of control mix with no fibers, and maximum torsional strength of 2.46 times that of control mix.

Keywords

• self compacting concrete
• steel fibers
• torsional behavior
• cyclic loads
• hysteresis diagrams