Seismic behavior of hybrid high ductility fiber reinforced concrete composite cross-shaped short columns
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Abstract:
To improve the seismic behavior of the cross-shaped short column, the concrete was substituted with high ductility fiber reinforced concrete in the bottom of the cross-shaped short column. Quasi-static tests on the hybrid high ductility fiber reinforced concrete composite cross-shaped short column (R/ECC) and the reinforced concrete cross-shaped short column (RC) were carried out. The crack propagation mode, failure characteristics, hysteretic behavior, ductility, energy dissipation and stiffness degradation were compared to investigate the seismic behavior of the R/ECC column. The results show that the hybrid high ductility fiber reinforced concrete can effectively control the development of the crack, decrease the width of the crack and improve the state of collapse and spalling. The ductility and energy dissipation of the composite column are improved obviously. The stiffness degradation becomes lower, and the shear capacity is improved. Compared with RC column, the displacement ductility factor, as well as the cumulative hysteretic energy dissipation at the peak and limit points of R/ECC column increased by 7.3%, 225.5% and 44.6%, respectively, and the shear capacity increased by 9.5%.
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Supported by the Foundation:National Natural Science Foundation of China（52178199，52078180）.
