Shear behavior of high-strength self-compacting concrete beam-column joint panels
The capability of self-compacting concrete (SCC) in flowing through and filling in even the most congested areas of reinforced concrete (RC) structures makes it ideal for being used in congested RC structural members such as beam-column joints (BCJ). However, members of tall multi-storey structures impose high capacity requirements where implementing normal-strength self-compacting concrete is not preferable. In the present study, a commercially reproducible high-strength self-compacting concrete (HSSCC) mix was designed using locally available materials in Christchurch, New Zealand. For comparison, a conventionally vibrated highstrength concrete (CVHSC) mix of equivalent compressive strength was also developed. Three beam-column joints (two HSSCC and a CVHSC) were designed following the guidelines of the New Zealand concrete standards NZS3101. Out of the two HSSCC subassemblies, one was designed using about half of the required joint shear reinforcement to investigat ethe relative contribution of concrete and joint shear reinforcement on the shear resistance of HSSCC beam-column subassemblies. All three BCJs were tested under a displacement-controlled quasi-static reversed cyclic regime. The cracking pattern at different load levels and the mode of failure are recorded. However, the measured load, displacement, drift, ductility, joint shear deformations, and elongation of the plastic hinge zone are also presented in this paper. It is found that none of the seismically important features are compromised by using HSSCC.