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http://dx.doi.org/10.12989/sem.2020.76.4.465

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)
Publication Information
Structural Engineering and Mechanics / v.76, no.4, 2020 , pp. 465-477 More about this Journal
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
Steel Reinforced Concrete (SRC) column; cross-shaped steel skeleton; lateral impact; experiment study; dynamic response; failure mode;
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