18 / 2022-03-07 17:04:34

Experimental Study of Shear Behavior of High Strength Steel Fiber Reinforce Column

high strength concrte,high strength steel,fiber reinforced concrete,shear,axial loading

The ties configuration in accordance with ACI 318-14 or newer for confinement and shear strength in a reinforced concrete (RC) column with high strength concrete or under high axial loading levels is strictly required. The increase in the amount of confinement may lead to construction difficulties, particularly in columns with small cross-section sizes. An alternative material that has feasibility in substituting and reducing the traditional transverse reinforcement while maintaining shear strength and ductility is required. Application of short and discontinuous steel fibers to RC members can be an effective alternative since previous experimental results showed the improvement of shear strength, ductility, and toughness after adding steel fibers. However, no comprehensive experimental study of shear behavior of steel fiber reinforced concrete (SFRC) column with high strength concrete and steel reinforcing bars under different axial compression loading level subjected to lateral displacement reversals were available. In this study, eight large-scale double curvature SFRC columns with concrete strength design, yield strength for longitudinal reinforcement, and yield strength for transverse reinforcement, respectively of 70 MPa, 685 MPa (SD685), and 785 MPa (SD785) were prepared and tested. Two different fiber volume fractions of 0.75% and 1.50% and four different axial loading levels of 0.1, 0.2, 0.3 and 0.4 Agf'c were considered. The test results show that the ultimate shear strength can be significantly improved to 2~4 times compared to that of high-strength concrete without fibers. Thus, the amount and detailing of transverse reinforcement can be notably reduced and simplified, respectively.