文献类型：期刊文献

英文题名：Exploring the energy dissipation mechanism and toughness quantitative model for high-toughness recycled concrete subjected to dynamic impact loading

作者：Wang, Changqing[1,4];Zhao, Wei[1];Dai, Yunyun[2];Wu, Huixia[3];Ma, Zhiming[2,3]

机构：[1]Shanghai Univ, Sch Mech & Engn Sci, Dept Civil Engn, Shanghai 200444, Peoples R China;[2]Yangzhou Univ, Coll Civil Sci & Engn, Yangzhou 225127, Peoples R China;[3]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China;[4]Tongji Univ, Coll Civil Engn, Dept Bldg Engn, Shanghai 200092, Peoples R China

年份：2025

卷号：108

外文期刊名：JOURNAL OF BUILDING ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:001509327900001)、、EI(收录号：20251918373223)、Scopus(收录号：2-s2.0-105004300677)、WOS

基金：The authors wish to acknowledge the financial support from Scientific Research Fund of Engineering Resilience Laboratory and Multi-Functional Shaking Tables Laboratory of Beijing University of Civil Engineering and Architecture through Grant No. (2024MFSTL01) , National Natural Science Foundation of China (NSFC) through Grant No. (51608383) , and China Postdoctoral Science Foundation through Grant Nos. (2014M550247) and (2015T80449) .

语种：英文

外文关键词：High-toughness recycled aggregate concrete; Split Hopkinson pressure bar; Energy dissipation; Toughness enhancement; Quantitative models

外文摘要：This study investigates the dynamic mechanical properties of high-toughness recycled aggregate concrete (HTRAC) under dynamic impact loading using Split Hopkinson Pressure Bar (SHPB) tests. The effect of fiber volume fraction on the energy dissipation behavior and toughness of HTRAC is systematically examined. Through energy dissipation analysis, elastic strain energy (Ee), plastic strain energy (Ep), and total strain energy (Et) are defined, highlighting the synergistic effects of fiber content and strain rate on energy distribution. The results show that, within the fiber volume fraction range of 0 %-2 %, Ee, Ep, and Et increase linearly with fiber content, with the most significant increase in plastic strain energy (Ep) observed at higher strain rates (150 s(-1)), with an 83 % increase. Quantitative models for the elastic and plastic strain energy impact factors (Ke and Kp) are proposed, confirming the significant role of micro-fiber content in optimizing energy absorption. Additionally, the study quantifies impact toughness using the toughness index which serves as a measure of the material's capacity for energy absorption and crack resistance. The results show that increasing fiber content significantly enhances the impact toughness index, particularly at higher strain rates. Fibers inhibit crack propagation through the bridging effect, transforming the failure mode from brittle fracture to multiple crack dispersion, which significantly improves the material's toughness. The model for impact toughness is validated by experimental data, demonstrating that the toughness index increases with fiber content and strain rate, confirming the positive impact of fibers on the material's dynamic performance. The findings provide a theoretical basis for predicting the dynamic performance, including impact toughness, and engineering applications of high-toughness recycled aggregate concrete (HTRAC), emphasizing its potential in applications requiring high-impact resistance.