摘要
为了研究接触爆炸作用下超高韧性水泥基复合材料-钢筋再生混凝土(ultra-high toughness cementitious composites-reinforced recycled aggregate concrete,UHTCC-R-RAC)叠合板的抗爆性能,设计了0 mm、10 mm厚度UHTCC层与25%、75%再生粗骨料取代率等级梯度的3组UHTCC-R-RAC试件,并开展了3次不同工况下的200 g乳化炸药接触爆炸破坏试验。随后,基于ANSYS/LS-DYNA软件的拉格朗日-欧拉法(ALE)与流固耦合算法建立了UHTCC-R-RAC叠合板的整体10 mm网格划分与局部5 mm网格精细化数值模型。研究结果表明:随着再生粗骨料取代率从25%增至75%,R-RAC叠合板迎爆面的应变峰值和加速度峰值分别降低了11.7%和6.4%,说明再生粗骨料取代率增加对R-RAC叠合板抗爆性能提升是不利的;UHTCC-R-RAC叠合板的应变峰值提升了64.7%,说明涂覆10 mm的UHTCC有利于R-RAC叠合板抗爆性能的提升。与整体10 mm网格模型结果比较,局部5 mm精细化网格模拟的精度较高,计算效率更高。
To investigate the blast resistance of Ultra-High Toughness Cementitious Composites-Reinforced Recycled Aggregate Concrete(UHTCC-R-RAC)composite slabs under contact explosion,three sets of UHTCC-R-RAC specimens with varying UHTCC layer thicknesses(0 mm and 10 mm)and recycled coarse aggregate substitution rates(25% and 75%)were designed and subjected to contact explosion tests using 200 g emulsion contact-explosions under different working conditions.Subsequently,a numerical model was developed using the Arbitrary Lagrangian-Eulerian(ALE)method and a fluid-structure coupling algorithm in ANSYS/LS-DYNA,incorporating both a global(10 mm)and a locally refined(5 mm)mesh configuration for the UHTCC-R-RAC composite panels.The experimental results indicate that increasing the replacement rate of recycled coarse aggregate from 25% to 75% reduces peak strain by 11.7% and peak acceleration by 6.4% on the blast-exposed surface of the R-RAC composite slab,demonstrating a negative correlation between RCA content and blast resistance.Conversely,the application of a 10 mm UHTCC layer significantly improved blast resistance,evidenced by a 64.7% increase in peak strain.Numerical simulations further confirmed that the locally refined 5 mm mesh model outperformed the global 10mm mesh model in both computational accuracy and efficiency.
作者
彭胜
张成喆
谢先启
何理
蔡路军
PENG Sheng;ZHANG Cheng-zhe;XIE Xian-qi;HE Li;CAI Lu-jun(College of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,China;College of Science,Wuhan University of Science and Technology,Wuhan 430065,China;State Key Laboratory of Precision Blasting,Jianghan University,Wuhan 430056,China)
出处
《爆破》
北大核心
2026年第1期1-10,19,共11页
Blasting
基金
湖北省自然科学基金资助项目(2022CFB662)
武汉市知识创新专项项目曙光计划项目(2023020201020403)
江汉大学精细爆破国家重点实验室开放基金(PBSKL2022D05)。
关键词
超高韧性水泥基复合材料-钢筋再生混凝土
叠合板
抗爆性能
精细化
数值模拟
ultra-high toughness cementitious composites-reinforced recycled aggregate concrete
laminated slab
blast resistance
refinement
numerical simulation
