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Earthquakes and Structures
  Volume 7, Number 5, November 2014, pages 779-796

High-strength RC columns subjected to high-axial and increasing cyclic lateral loads
Muhammad Y. Bhayusukma and and Keh-ChyuanTsai

    This experimental investigation was conducted to examine the behavior and response of high-strength material (HSM) reinforced concrete (RC) columns under combined high-axial and cyclic-increasing lateral loads. All the columns use high-strength concrete (fc\' =100 MPa) and high-yield strength steel (fy =685 MPa and fy=785 MPa) for both longitudinal and transverse reinforcements. A total of four full-scale HSM columns with amount of transverse reinforcement equal to 100% more than that required by earthquake resistant design provisions of ACI-318 were tested. The key differences among those four columns are the spacing and configuration of transverse reinforcements. Two different constant axial loads, i.e. 60% and 30% of column axial load capacity, were combined with cyclically-increasing lateral loads to impose reversed curvatures in the columns. Test results show that columns under 30% of axial load capacity behaved much more ductile and had higher lateral deformational capacity compared to columns under the 60% of axial load capacity. The columns using closer transverse reinforcement spacing have slightly higher ductility than columns with larger spacing.
Key Words
    high-strength concrete; high-yield strength steel; high-axial load, RC column, cyclic loads, ductility
Muhammad Y. Bhayusukmaand and Keh-ChyuanTsai: Department of Civil Engineering, National Taiwan University,
No. 1, Sec. 4, Roosevelt Road, Taipei, Taiwan

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