Abstract

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Title:: Dynamic Response Experiment and Numerical Simulation of CFST Columns Under Lateral Impact Load

Author(s):: GUO Yu-rong; LI Yan-zhen; HUO Jing-si; XIAO Yan; LI Zhi; College of Civil Engineering, Hunan University

Keywords:: CFST column; impact test; numerical simulation; impact resistance; failure mechanism; dynamic response

Abstract:: In order to study the dynamic behaviors of concrete-filled steel tube (CFST) column under lateral impact load，lateral impact tests for two circular CFST columns were conducted, and impact force, impact point deflection-time curves as well as force-deflection curves were measured. Impact process of CFST column under impact load was simulated by using ABAQUS nonlinear model, the failure mode and time-history curves of impact force, impact point deflection were obtained, and the simulation results agreed well with the experimental ones. The modeling results revealed the failure mechanism of CFST columns under impact load. The global failure process were divided into four stages, local response phase in the impact zone, support response phase on the column top, steady response phase and unloading response phase. The results show that CFST columns appear bending-shear failure under impact load. The research can provide experimental and theoretical basis to deeply understand the impact resistance and failure mode of CTST column, and it can provide evidence for reasonable anti-impact design method.