Ji Long, Wang Ping, Cai Youer, Shang Wei, Zu Xudong
Xi'an Modern Control Technology Research Institute, Xi'an 710065, China.
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Materials (Basel). 2022 Jan 23;15(3):850. doi: 10.3390/ma15030850.
Enhancing the blast resistance of building walls is a research hotspot in the field of anti-terrorism and explosion protection. In this study, numerical simulation and experimental verification were combined to analyze the failure phenomenon of brick masonry wall and sprayed polyurea-reinforced brick wall under contact explosion and determine the failure response parameters of the wall. The failure limit, mode, and mechanism of a 240 mm wall without reinforcement and strengthened with polyurea elastomer under different strength loads were investigated. Under contact explosion, the increase in the size of the blasting pit of the 240 mm wall gradually slowed down after the dose was increased to higher than 0.5 kg. Thereafter, the energy of the explosive load was released by splashing wall fragments as well as by deflecting and movement of the wall. The results show that the 240 mm walls sprayed with polyurea elastomer had outstanding anti-explosion performance because it wraps the damaged area and fragments of masonry wall inside the polyurea layer. When the thickness of the polyurea layer increases to 8 mm, the damaged area of the masonry wall decreases by 55.6% compared with that without reinforcement. The numerical simulation results were in good agreement with the experimental results.
提高建筑墙体的抗爆性能是反恐防爆领域的研究热点。本研究采用数值模拟与实验验证相结合的方法，分析了砖砌墙体和喷涂聚脲加固砖砌墙体在接触爆炸作用下的破坏现象，确定了墙体的破坏响应参数。研究了不同强度荷载作用下，未加固和用聚脲弹性体加固的240mm墙体的破坏极限、破坏模式和破坏机理。在接触爆炸作用下，当药量增加到高于0.5kg后，240mm墙体爆破坑尺寸的增大逐渐减缓。此后，爆炸荷载的能量通过墙体碎片飞溅以及墙体的偏转和移动得以释放。结果表明，喷涂聚脲弹性体的240mm墙体具有优异的抗爆性能，因为它将砖砌墙体的损伤区域和碎片包裹在聚脲层内部。当聚脲层厚度增加到8mm时，砖砌墙体的损伤面积与未加固墙体相比减少了55.6%。数值模拟结果与实验结果吻合良好。
