Earthquakes and Structures

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High-strength RC columns subjected to high-axial and increasing cyclic lateral loads

  • Bhayusukma, Muhammad Y. (Department of Civil Engineering, National Taiwan University) ;
  • Tsai, Keh-Chyuan (Department of Civil Engineering, National Taiwan University)
  • Received : 2013.12.24
  • Accepted : 2014.03.29
  • Published : 2014.11.25
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Abstract

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 ($f_c{^{\prime}}$=100MPa) and high-yield strength steel ($f_y$=685MPa and $f_y$=785MPa) 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.

Keywords

Acknowledgement

Supported by : National Center for Research on Earthquake Engineering (NCREE)

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