Structural Engineering and Mechanics

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Dynamic behavior of SRC columns with built-in cross-shaped steels subjected to lateral impact

  • Liu, Yanhua (School of Urban Construction, Yangtze University) ;
  • Zeng, Lei (School of Urban Construction, Yangtze University) ;
  • Liu, Changjun (School of Urban Construction, Yangtze University) ;
  • Mo, Jinxu (School of Urban Construction, Yangtze University) ;
  • Chen, Buqing (School of Urban Construction, Yangtze University)
  • Received : 2020.01.04
  • Accepted : 2020.07.08
  • Published : 2020.11.25
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Abstract

This paper presents an investigation on the dynamic behavior of SRC columns with built-in cross-shaped steels under impact load. Seven 1/2 scaled SRC specimens were subjected to low-speed impact by a gravity drop hammer test system. Three main parameters, including the lateral impact height, the axial compression ratios and the stirrup spacing, were considered in the response analysis of the specimens. The failure mode, deformation, the absorbed energy of columns, as well as impact loads are discussed. The results are mainly characterized by bending-shear failure, meanwhile specimens can maintain an acceptable integrity. More than 33% of the input impact energy is dissipated, which demonstrates its excellent impact resistance. As the impact height increases, the flexural cracks and shear cracks observed on the surface of specimens were denser and wider. The recorded time-history of impact force and mid-span displacement confirmed the three stages of relative movement between the hammer and the column. Additionally, the displacements had a notable delay compared to the rapid changes observed in the measured impact load. The deflection of the mid-span did not exceed 5.90mm while the impact load reached peak value. The impact resistance of the specimen can be improved by proper design for stirrup ratios and increasing the axial load. However, the cracking and spalling of the concrete cover at the impact point was obvious with the increasing in stiffness.

Keywords

Acknowledgement

The research is supported by the National Natural Science Foundation of China (Grant number 51978078) and the Science Foundation of Hubei Province of China (Grant number 2016CFB604). The authors also would like to thanks for every staff of the civil engineering test center of Yangtze University participated in this study.

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