| Title |
Experimental Study on the Shear Strength of Ultra High-Strength Concrete Exterior Beam-Column Joints under Cyclic Loads |
| Authors |
Kim Yoon-Il ; Kim Myung-Sung ; Lee Yang-Keun ; Han Hyung-Sub |
| Keywords |
Ultra High-strength Concrete Beam-column Joint ; Steel Fiber Reinforced Concrete ; Joint Shear Strength ; Joint Shear Reinforcement |
| Abstract |
This experimental study was carried out to investigate the effects of hoop bars and steel fibers as shear reinforcement in the exterior beam-column joint of RC frames using ultra high-strength concrete, 90MPa~100MPa, under cyclic loads. Four specimens of J1, J2, J3A and J3B scaled down to 2/3 were manufactured. J1 was not reinforced laterally in the joint and J2 was reinforced laterally with hoop bars of 20% of shear reinforcement calculated by ACI 352. The joints of J3A and J3B with slab and spandrel beams were made of ultra high-strength concrete with fiber volume of 1.5%. The influence of different joint details on the hysteretic behavior of the joints was described based on joint damage and rotation, load sustainability and seismic energy dissipation capacity according to increasing displacement ductility. Experimental results indicated that J2 specimen containing 3-D10 hoop bars and J3A specimen using steel fiber reinforced concrete showed superior hysteretic response in comparison with J1 specimen without shear reinforcements, and that J3B specimen with slab and spandrel beams showed very high shear strength in the joint. |