Anti-impact performance of high-strength concrete-filled steel tubular columns with local penetrating corrosion
ZHANG Qian1,2, WANG Yulin3, ZHAO Junhai1, GAO Shan4,5
1.School of Civil Engineering, Chang’an University, Xi’an 710064, China;
2.Xi’an Engineering Design Academy of Chang’an University Co., Ltd., Xi’an 710064, China;
3.School of Civil Engineering, Xijing University, Xi’an 710000, China;
4.School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China;
5.Postdoctoral Station of Civil Engineering, Chongqing University, Chongqing 400045, China
Abstract：When concrete-filled steel tube shows local corrosion, its impact resistance will be significantly affected. Therefore, the numerical model of high-strength concrete-filled square steel tubular column (HSCFST) is established by using ABAQUS. The effects of crack angle, crack length, impact surface and impact energy on the impact resistance of HSCFST column are considered. The results show that under local penetrating corrosion, the horizontal crack in the model under front impact will close, while the horizontal cracks in the models under side impact will appear "triangular" shape when the models are damaged. The impact force platform value is mainly affected by the impact surface, followed by the crack angle. The crack length mainly has a great influence on the models under rear impact. The increase of the crack angle and the decrease of the crack length are directly proportional to the increase of the impact force platform value. The impact resistance of the model bearing the front impact is better than that of the model bearing the side and back impact. Reducing the crack angle will increase the mid-span deflection of the member. The mid-span deflection of the member under front impact is less than that of the member under rear and side impact. The energy absorption rate of the model is directly proportional to the increase of the crack length and inversely proportional to the increase of the crack angle. The energy absorption rate of the models subjected to back impact is the highest, while that to front impact is the lowest. A practical calculation method for the improvement coefficient of dynamic flexural capacity of HSCFST columns under local penetrating corrosion is proposed.
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