Self Compacting Hybrid Fiber Reinforced Concrete Composites for Bridge Columns

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Self Compacting Hybrid Fiber Reinforced Concrete Composites for Bridge Columns

Author: Kumar, Pardeep; Jen, Gabriel; Trono, William; Panagiotou, Marios; Ostertag, Claudia P. | Size: 4.67 MB | Format: PDF | Publisher: Pacific Earthquake Engineering Research (PEER) Center, University of California, Berkeley | Year: 2011-09 | pages: 138

Self compacting hybrid fiber reinforced concrete composites for bridge columns

Kumar, Pardeep; Jen, Gabriel; Trono, William; Panagiotou, Marios; Ostertag, Claudia P.

PEER-2011/106, Pacific Earthquake Engineering Research (PEER) Center, University of California, Berkeley, authors retain copyright, 2011-09, PDF (4.5 MB) (400/P33/2011-106)

The 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 specimens attained large drift ratios of up to 11% without losing axial load carrying capacity and were successful in resisting damage due to spalling of concrete up to drift ratios of 3.6%. Compared to a conventional reinforced concrete column of same dimensions, longitudinal steel ratio, and axial load ratio, the SC-HyFRC columns exhibited superior damage resistance and better load carrying capacity despite a 50% reduction in transverse reinforcement.

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