Numerical Analysis on Dynamic Response of CFRP-Wrapped RC Columns under Lateral Impact Loading

• Published in: Materials Vol. 16; no. 6; p. 2425
• Main Authors: Liu, Tao, Xu, Xiaoqing, Chen, Lin, Kim, Sanghee, Hong, Seongwon
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 18.03.2023; MDPI
• Subjects: Analysis; Axial compression; Boundary conditions; Carbon; Carbon fiber reinforced concretes; Carbon fiber reinforced plastics; CFRP; Compression ratio; Concrete; Concrete columns; Damage; Deformation; Dynamic response; Failure modes; Fiber reinforced polymers; Finite element analysis; Finite element method; Impact loads; Impact tests; Impact velocity; lateral impact loading; Liu, Timothy; LS-DYNA; Mathematical models; Numerical analysis; Parameter sensitivity; parametric analysis; Parametric statistics; Polymers; RC columns; Retrofitting; Shear forces; Shear strength; Tensile strength; Velocity; lateral impact loading; damage mode; impact resistance; LS-DYNA; parametric analysis; axial compression ratio; impact velocity; finite element analysis; CFRP; RC columns
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma16062425

This paper presents a numerical study examining the dynamic response and resistance mechanism of reinforced concrete (RC) columns strengthened with or without carbon-fiber-reinforced polymer (CFRP) wraps under lateral impact loading by using the software LS-DYNA. First, the information of eight column models was briefly introduced as part of the laboratory experimental program from the literature. Secondly, finite element (FE) models were established in terms of the geometries of impact tests. Then, a detailed comparison between numerical results and experimental results was made, and FE models showed a relatively high simulation accuracy. Subsequently, a series of parametric analyses were carried out with a focus on the effects of axial compression ratio, the boundary condition at the column top, the layer number of CFRP wraps, and the impact velocity and impact height on the dynamic responses of plain and strengthened columns. The results demonstrated that the CFRP retrofit mechanism was not activated during the initial Stage-I when the impact force rapidly increased to the first peak and then decreased to zero. CFRP strengthening came into play in the second stage, Stage-II, and affected the response of the shear force and moment along the column height, as well as had a great influence on the control of shear damage. The dynamic response of RC columns was more sensitive to the impact velocity than to other parameters, regardless of whether CFRP wrapping was applied. The axial compression ratio would have a different influence on the column failure mode if the impact velocity was varied. The variation in impact height and boundary condition at the column top had little influence on the damage mode of strengthened columns.