Steel and Composite Structures

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Cyclic loading test for concrete-filled hollow PC column produced using various inner molds

  • Chae-Rim Im (Department of Architectural Engineering, Kyonggi University) ;
  • Sanghee Kim (Department of Architectural Engineering, Kyonggi University) ;
  • Keun-Hyeok Yang (Department of Architectural Engineering, Kyonggi University) ;
  • Ju-Hyun Mun (Department of Architectural Engineering, Kyonggi University) ;
  • Jong Hwan Oh (Technical Research Institute, IS Dongseo) ;
  • Jae-Il Sim (Korea Disaster Prevention Safety Technology Co., Ltd)
  • Received : 2021.12.02
  • Accepted : 2023.03.25
  • Published : 2023.03.25
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Abstract

In this study, cyclic loading tests were conducted to assess the seismic performance of cast-in-place (CIP) concrete-filled hollow core precast concrete columns (HPCC) constructed using steel ducts and rubber tubes. The outer shells of HPCC, with a hollow ratio of 47%, were fabricated using steel ducts and rubber tubes, respectively. Two combinations of shear studs & long threaded bars or cross-deformed bars & V-ties were employed to ensure the structural integrity of the old concrete (outer shell) and new CIP concrete. Up to a drift ratio of 3.8%, the hysteresis loop, yielding stiffness, dissipated energy, and equivalent damping ratio of the HPCC specimens were largely comparable to those of the solid columns. Besides the similarities in cyclic load-displacement responses, the strain history of the longitudinal bars and the transverse confinement of the three specimens also exhibited similar patterns. The measured maximum moment exceeded the predicted moment according to ACI 318 by more than 1.03 times. However, the load reduction of the HPCC specimen after reaching peak strength was marginally greater than that of the solid specimen. The energy dissipation and equivalent damping ratios of the HPCC specimens were 20% and 25% lower than those of the solid specimen, respectively. Taking into account the overall results, the structural behavior of HPCC specimens fabricated using steel ducts and rubber tubes is deemed comparable to that of solid columns. Furthermore, it was confirmed that the two combinations for securing structural integrity functioned as expected, and that rubber air-tubes can be effectively used to create well-shaped hollow sections.

Keywords

Acknowledgement

This research work was supported by the National Research Foundation of Korea (NRF), grant numbers NRF-2021R1I1A2048618 and NRF-2022R1A4A5028239.

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