1. Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering, Fujian University of Technology, Fuzhou 350118, China;
2. College of Civil Engineering, Fuzhou University, Fuzhou 350116, China
Abstract：In order to study the damage of recycled aggregate concrete filled-steel tubular (RACFST) column under impact load, 16 RACFST columns were subjected to drop hammer impact tests. Based on the test, the finite element model of RACFST was established to analyze the influence of different impact velocity, impact mass and section steel content on the damage degree of RACFST column. By controlling impact mass and impact velocity, damage assessment grades were divided based on damage factor ds and elastic-plastic Angle θ, and the damage assessment curves of RACFST columns were fitted by simulation. The results show that the difference between FEM results and experimental results is less than 10%, and the former can reflect the change of the latter. The peak time of mid-span deflection in the impact process lagged far behind the peak time of impact force, and impulse was 1.23 times of momentum. With the increase of impact velocity, the mid-span deflection increased in a parabolic trend. The increase of impact mass has little effect on the peak of impact force but has a great effect on the mid-span deflection. With the increase of steel content in the section, the energy consumption of the member almost stabilized around 90%. The overall damage and local damage of the RACFST column could be quickly judged from the damage curve.
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