TY - JOUR
T1 - Experimental and numerical studies on impact behaviors of recycled aggregate concrete-filled steel tube after exposure to elevated temperature
AU - Li, Wengui
AU - Luo, Zhiyu
AU - Wu, Chengqing
AU - Tam, Vivian W.Y.
AU - Duan, Wen Hui
AU - Shah, Surendra P.
PY - 2017/12/15
Y1 - 2017/12/15
N2 - This study investigated the impact behaviors of recycled aggregate concrete-filled steel tube (RACFST) after exposed to elevated temperatures by experimental and numerical studies. The impact test on RACFST was conducted by a split Hopkinson pressure bar (SHPB) with 100 mm-diameter. After the validation of finite element method simulation by the experimental results, parametric analysis were applied to analyze the effects of RAC strength, steel strength and steel ratio on the impact behaviors and deformation properties of the RACFSTs exposed to elevated temperatures ranging from 20 °C, 200 °C to 500 °C and to 700 °C. The results show that both the increases in RAC strength, steel strength and steel ratio significantly enhance the impact resistance of RACFST. However, when RAC strength deteriorates quickly after exposure to high temperature, the increase in RAC strength just slightly improves the impact properties of RACFST, especially after exposure to elevated temperatures higher than 500 °C. In conclusion, increasing steel ratio is an effective way for improving the impact behaviors of RACFST, but resulting in higher cost for practical application. For the impact design of RACFST, steel strength and steel ratio are two essential factors in terms of impact behavior enhancement and cost efficiency.
AB - This study investigated the impact behaviors of recycled aggregate concrete-filled steel tube (RACFST) after exposed to elevated temperatures by experimental and numerical studies. The impact test on RACFST was conducted by a split Hopkinson pressure bar (SHPB) with 100 mm-diameter. After the validation of finite element method simulation by the experimental results, parametric analysis were applied to analyze the effects of RAC strength, steel strength and steel ratio on the impact behaviors and deformation properties of the RACFSTs exposed to elevated temperatures ranging from 20 °C, 200 °C to 500 °C and to 700 °C. The results show that both the increases in RAC strength, steel strength and steel ratio significantly enhance the impact resistance of RACFST. However, when RAC strength deteriorates quickly after exposure to high temperature, the increase in RAC strength just slightly improves the impact properties of RACFST, especially after exposure to elevated temperatures higher than 500 °C. In conclusion, increasing steel ratio is an effective way for improving the impact behaviors of RACFST, but resulting in higher cost for practical application. For the impact design of RACFST, steel strength and steel ratio are two essential factors in terms of impact behavior enhancement and cost efficiency.
KW - Elevated temperature
KW - Impact behavior
KW - Numerical simulation
KW - Recycled aggregate concrete-filled steel tube (RACFST)
KW - Split Hopkinson pressure bar (SHPB)
UR - http://www.scopus.com/inward/record.url?scp=85031016590&partnerID=8YFLogxK
U2 - 10.1016/j.matdes.2017.09.057
DO - 10.1016/j.matdes.2017.09.057
M3 - Article
AN - SCOPUS:85031016590
SN - 0264-1275
VL - 136
SP - 103
EP - 118
JO - Materials & Design
JF - Materials & Design
ER -