Self Compacting Hybrid Fiber Reinforced Concrete Composites for Bridge Columns

摘要

Although fiber-reinforced composites have the potential to enhance the seismic performance of bridge columns, their use has been hampered by their poor workability and inadequate compaction for cast-in-place applications. To address this issue, this study developed a self compacting hybrid fiber reinforced concrete (SC-HyFRC) composite. Optimized specifically for bridge columns, this composite flows under its own weight, completely filling the formwork and achieving full compaction without internal or external vibration. In addition, this SC-HyFRC provides enhanced ductility, shear resistance, and damage tolerance compared to conventional fiber-reinforced composites. To investigate the seismic performance and post-earthquake damage resistance of bridge columns composed of SC-HyFRC, two 1:4.5 scale column specimens were built and tested statically under uni-directional cyclic loading. In both specimens the volumetric transverse reinforcement was 0.37%, which is two to three times less than that of typical Caltrans bridge columns. Both test specimens had the same longitudinal steel ratio of 1.2%.